/* CSS variables & Core Theme Customization */
:root {
    --bg-dark: #0b0f19;
    --bg-dark-rgb: 11, 15, 25;
    --card-bg: rgba(17, 24, 39, 0.65);
    --card-bg-hover: rgba(31, 41, 55, 0.8);
    --primary: #00f5d4; /* Neon Mint */
    --primary-rgb: 0, 245, 212;
    --primary-hover: #00d2b6;
    --secondary: #3b82f6; /* Cyber Blue */
    --secondary-rgb: 59, 130, 246;
    --accent: #8b5cf6; /* Cyber Purple */
    --text-main: #f3f4f6;
    --text-muted: #9ca3af;
    --border-color: rgba(255, 255, 255, 0.08);
    --border-glow: rgba(0, 245, 212, 0.25);
    --border-focus: #00f5d4;
    --font-heading: 'Outfit', 'Plus Jakarta Sans', sans-serif;
    --font-body: 'Plus Jakarta Sans', sans-serif;
    --font-mono: 'Fira Code', monospace;
    --transition-speed: 0.3s;
    --border-radius: 12px;
}

/* Global Resets & Basics */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: var(--font-body);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    position: relative;
}

/* Scaled Container for small desktop screens */
#scaled-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    width: 100%;
}

/* Background Grids & Orbs */
.vault-bg-grid {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(255, 255, 255, 0.015) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
    background-size: 40px 40px;
    background-position: center top;
    pointer-events: none;
    z-index: 1;
    transform: translate(var(--px-grid, 0px), var(--py-grid, 0px));
    transition: transform 0.6s cubic-bezier(0.1, 0.8, 0.2, 1);
}

.glow-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.22;
    pointer-events: none;
    z-index: 1;
    mix-blend-mode: screen;
    transition: transform 0.8s cubic-bezier(0.1, 0.8, 0.2, 1);
}

.orb-1 {
    top: 15%;
    left: 20%;
    width: 450px;
    height: 450px;
    background: radial-gradient(circle, rgba(var(--primary-rgb), 0.65) 0%, transparent 70%);
    animation: floatOrb1 20s ease-in-out infinite;
}

.orb-2 {
    bottom: 20%;
    right: 15%;
    width: 550px;
    height: 550px;
    background: radial-gradient(circle, rgba(var(--secondary-rgb), 0.55) 0%, transparent 70%);
    animation: floatOrb2 25s ease-in-out infinite;
}

@keyframes floatOrb1 {
    0% { transform: translate(var(--px1, 0px), var(--py1, 0px)) scale(1); }
    50% { transform: translate(calc(var(--px1, 0px) + 50px), calc(var(--py1, 0px) - 30px)) scale(1.15); }
    100% { transform: translate(var(--px1, 0px), var(--py1, 0px)) scale(1); }
}

@keyframes floatOrb2 {
    0% { transform: translate(var(--px2, 0px), var(--py2, 0px)) scale(1); }
    50% { transform: translate(calc(var(--px2, 0px) - 40px), calc(var(--py2, 0px) + 40px)) scale(0.9); }
    100% { transform: translate(var(--px2, 0px), var(--py2, 0px)) scale(1); }
}

.header-wrapper {
    position: sticky;
    top: 0;
    width: 100%;
    display: flex;
    justify-content: center;
    z-index: 1000;
    pointer-events: none;
}

/* Header Styles - Floating Pill Dock / Notch */
.vault-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 2rem;
    background: 
        radial-gradient(
            200px circle at var(--mouse-x, -1000px) var(--mouse-y, -1000px), 
            rgba(0, 245, 212, 0.08), 
            transparent 80%
        ),
        rgba(15, 23, 42, 0.75); /* Slate glass background */
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 100px;
    margin: 1.25rem 0 0 0; 
    width: 92%;
    max-width: 1200px;
    pointer-events: auto;
    transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

/* Real-time spotlight border glow tracking cursor */
.vault-header::after {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: inherit;
    padding: 1px;
    background: radial-gradient(
        220px circle at var(--mouse-x, -1000px) var(--mouse-y, -1000px),
        rgba(0, 245, 212, 0.45), /* Cyan spotlight border glow */
        transparent 65%
    );
    -webkit-mask: 
        linear-gradient(#fff 0 0) content-box, 
        linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.4s ease;
    z-index: 2;
}

.vault-header:hover::after {
    opacity: 1;
}

.vault-header:hover {
    box-shadow: 
        0 12px 35px rgba(0, 0, 0, 0.5),
        0 0 15px rgba(0, 245, 212, 0.12);
}

.header-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
}

.logo-icon {
    font-size: 1.75rem;
    color: var(--primary);
    filter: drop-shadow(0 0 8px rgba(var(--primary-rgb), 0.5));
}

.logo-text {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.4rem;
    letter-spacing: 2px;
}

.accent-text {
    color: var(--primary);
    margin-left: 2px;
}

.header-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.03);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    border: 1px solid var(--border-color);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.5px;
}

.status-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
}

.status-indicator.online {
    background-color: var(--primary);
    box-shadow: 0 0 8px var(--primary);
}

.status-indicator.offline {
    background-color: #ef4444;
    box-shadow: 0 0 8px #ef4444;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(59, 130, 246, 0.1);
    padding: 0.4rem 0.8rem;
    border-radius: 8px;
    border: 1px solid rgba(var(--secondary-rgb), 0.2);
}

.profile-icon {
    color: var(--secondary);
}

.profile-name {
    font-size: 0.85rem;
    font-weight: 600;
}

.logout-btn {
    padding: 0.2rem 0.4rem;
    font-size: 0.8rem;
    margin-left: 0.5rem;
    color: var(--text-muted);
}

.logout-btn:hover {
    color: #ef4444;
}

/* Button UI Components */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.65rem 1.25rem;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.9rem;
    border-radius: var(--border-radius);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition-speed) ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--bg-dark);
    font-weight: 700;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(var(--primary-rgb), 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(var(--primary-rgb), 0.5);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-main);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--primary);
    box-shadow: 0 0 10px rgba(var(--primary-rgb), 0.2);
}

.btn-icon-only {
    padding: 0.65rem;
    aspect-ratio: 1;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-color);
    color: var(--text-main);
}

.btn-icon-only:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--primary);
    color: var(--primary);
}

.btn-text-back {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    padding: 0.5rem 0;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    transition: color var(--transition-speed);
}

.btn-text-back:hover {
    color: var(--primary);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.1rem;
    border-radius: 12px;
}

.btn-full {
    width: 100%;
}

/* Main Layout Setup */
.vault-main {
    flex: 1;
    display: flex;
    justify-content: center;
    position: relative;
    z-index: 10;
    width: 100%;
}

.vault-screen {
    width: 100%;
    max-width: 1240px;
    padding: 2rem 1.5rem;
    display: none;
    animation: screenFadeIn 0.45s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.vault-screen.active {
    display: block;
}

@keyframes screenFadeIn {
    from {
        opacity: 0;
        transform: translateY(16px) scale(0.98);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.stagger-card {
    opacity: 0;
    animation: cardAppear 0.55s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes cardAppear {
    from {
        opacity: 0;
        transform: translateY(22px) scale(0.96);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* Screen Headers styling */
.screen-header {
    margin-bottom: 2.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1.5rem;
}

.screen-header.flex-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-left {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 1.25rem;
}

.header-left .btn-text-back {
    border-right: 1px solid rgba(255, 255, 255, 0.15);
    padding-right: 1.25rem;
    padding-left: 0 !important;
}

.screen-title {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: 1px;
    margin-top: 0.5rem;
}

.screen-desc {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-top: 0.25rem;
}

/* Breadcrumb Navigation */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-top: 0;
    text-transform: uppercase;
}

.bc-teacher {
    color: var(--secondary);
    font-weight: 700;
    font-size: 1.15rem; /* Make the selected teacher text larger */
    letter-spacing: 0.5px;
}

.bc-class {
    color: var(--primary);
    font-weight: 700;
    font-size: 1.15rem; /* Make the selected class text larger */
    letter-spacing: 0.5px;
}

.separator {
    font-size: 0.6rem;
    color: rgba(255, 255, 255, 0.2);
}

/* SCREEN 1: LANDING SCREEN - Chalkboard & Rain */
#screen-landing {
    display: none;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    overflow: hidden; /* Prevent rain overflowing */
}

#screen-landing.active {
    display: flex;
}

#rain-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none; /* Let clicks pass through to buttons */
    z-index: 1;
    opacity: 0.55; /* More visible visual rain effect */
}

.landing-content {
    max-width: 650px;
    margin: auto;
    padding: 2rem;
    position: relative;
    z-index: 5; /* Sit on top of canvas */
}

/* Vault Dial Animation graphic */
.vault-graphic-container {
    margin-bottom: 2rem;
    display: flex;
    justify-content: center;
}

.vault-outer-ring {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    background: linear-gradient(135deg, #1e293b, #0f172a);
    border: 6px solid #475569;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.6), inset 0 2px 10px rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    transition: transform 1s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.vault-inner-ring {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: #0f172a;
    border: 4px dashed var(--primary);
    box-shadow: 0 0 15px rgba(var(--primary-rgb), 0.25);
    display: flex;
    align-items: center;
    justify-content: center;
}

.vault-handle {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    background: radial-gradient(circle, #64748b 0%, #334155 100%);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.5);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.handle-bar {
    position: absolute;
    width: 12px;
    height: 110px;
    background: linear-gradient(#94a3b8, #475569);
    border-radius: 6px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.4);
    z-index: 2;
}

.handle-bar.horizontal {
    transform: rotate(90deg);
}

.vault-dial {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: #1e293b;
    border: 2px solid #475569;
    z-index: 3;
    display: flex;
    align-items: center;
    justify-content: center;
}

.dial-mark {
    position: absolute;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--text-muted);
}

.dial-mark:nth-child(1) { top: -14px; }
.dial-mark:nth-child(2) { right: -16px; }
.dial-mark:nth-child(3) { bottom: -14px; }
.dial-mark:nth-child(4) { left: -16px; }

/* Spin animations */
.vault-outer-ring.unlocked {
    transform: rotate(360deg);
    border-color: var(--primary);
    box-shadow: 0 0 30px rgba(var(--primary-rgb), 0.4);
}

.landing-title {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: 2px;
    background: linear-gradient(to right, #ffffff, var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 1rem;
}

.landing-subtitle {
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 2rem;
}

/* Classic School Vibe Landing Page */
.school-vibe {
    display: flex;
    flex-direction: column;
    align-items: center;
    max-width: 800px;
    margin: 0 auto;
}

/* 1. Chalkboard Container & Surface */
.chalkboard-container {
    width: 100%;
    max-width: 650px;
    margin: 0 auto 2.5rem auto;
    display: flex;
    flex-direction: column;
    filter: drop-shadow(0 15px 30px rgba(0, 0, 0, 0.5));
}

.chalkboard-frame {
    background: linear-gradient(135deg, #5c3818, #3d2510);
    padding: 16px;
    border-radius: 8px 8px 0 0;
    box-shadow: inset 0 2px 5px rgba(255,255,255,0.1), 0 4px 10px rgba(0,0,0,0.4);
    border: 1px solid #2b1a0b;
}

.chalkboard-surface {
    background-color: #162a1c;
    background-image: 
        radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.04) 0%, transparent 80%),
        linear-gradient(rgba(255,255,255,0.005) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.005) 1px, transparent 1px);
    background-size: 100% 100%, 30px 30px, 30px 30px;
    border: 3px double rgba(255, 255, 255, 0.15);
    border-radius: 4px;
    min-height: 240px;
    padding: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    overflow: hidden;
}

#chalkboard-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2;
    touch-action: none;
}

#clear-chalkboard-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px dashed rgba(255, 255, 255, 0.25);
    color: rgba(255, 255, 255, 0.65);
    padding: 6px 12px;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.75rem;
    border-radius: 6px;
    cursor: pointer;
    z-index: 10;
    transition: all 0.2s ease;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

#clear-chalkboard-btn:hover {
    background: rgba(239, 68, 68, 0.15);
    color: #ef4444;
    border-color: rgba(239, 68, 68, 0.4);
    box-shadow: 0 0 10px rgba(239, 68, 68, 0.1);
}

/* Subtle chalk board dust shadow overlay */
.chalkboard-surface::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 70% 30%, rgba(255,255,255,0.03) 0%, transparent 60%);
    pointer-events: none;
}

.chalkboard-title {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex: 1;
    z-index: 1;
    pointer-events: none;
    user-select: none;
}

.chalk-handwritten {
    font-family: 'Caveat', cursive;
    font-size: 2.2rem;
    color: rgba(254, 240, 138, 0.85); /* Chalky yellow */
    text-shadow: 0 0 5px rgba(254, 240, 138, 0.35);
    transform: rotate(-3deg);
    margin-bottom: 0.25rem;
}

.chalk-main-title {
    font-family: var(--font-heading);
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: 2px;
    color: rgba(255, 255, 255, 0.95);
    text-shadow: 
        0 0 2px rgba(255,255,255,0.6),
        0 0 8px rgba(255,255,255,0.2),
        1px 2px 2px rgba(0,0,0,0.5);
    text-align: center;
    line-height: 1.2;
}

.chalk-drawings {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 90px;
    height: 100%;
    opacity: 0.25;
    z-index: 1;
    pointer-events: none;
    user-select: none;
}

.chalk-icon {
    font-size: 1.8rem;
    color: #ffffff;
    filter: drop-shadow(0 0 2px #fff);
}

.chalk-math {
    font-family: 'Caveat', cursive;
    font-size: 1.25rem;
    color: #ffffff;
    white-space: nowrap;
}

.left-drawings {
    transform: rotate(-8deg);
}

.right-drawings {
    transform: rotate(8deg);
}

/* Chalk Tray with erasers and chalk sticks */
.chalkboard-tray {
    height: 22px;
    background: linear-gradient(to bottom, #7c4e24, #4e2f13);
    border-radius: 0 0 8px 8px;
    position: relative;
    border-top: 1px solid #996232;
    box-shadow: 0 5px 8px rgba(0,0,0,0.4);
    display: flex;
    align-items: center;
}

.chalk-stick {
    height: 9px;
    border-radius: 2px;
    position: absolute;
    bottom: 6px;
    box-shadow: 1px 1px 3px rgba(0, 0, 0, 0.4);
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.chalk-stick::before, .chalk-eraser::before {
    content: '';
    position: absolute;
    top: -12px;
    bottom: -12px;
    left: -12px;
    right: -12px;
}

.chalk-stick:hover {
    transform: scale(1.1) translateY(-2px);
}

.stick-white {
    width: 32px;
    background-color: #ffffff;
    left: 45px;
    transform: rotate(2deg);
}

.stick-white.active {
    transform: scale(1.2) translateY(-4px) rotate(4deg);
    box-shadow: 0 0 10px #ffffff, 1px 2px 4px rgba(0,0,0,0.4);
    border: 1.5px solid #00f5d4;
}

.stick-yellow {
    width: 28px;
    background-color: #fef08a;
    left: 95px;
    transform: rotate(-4deg);
}

.stick-yellow.active {
    transform: scale(1.2) translateY(-4px) rotate(-6deg);
    box-shadow: 0 0 10px #fef08a, 1px 2px 4px rgba(0,0,0,0.4);
    border: 1.5px solid #00f5d4;
}

.chalk-eraser {
    width: 50px;
    height: 13px;
    background: #374151;
    border-top: 3px solid #6b7280;
    border-radius: 2px;
    position: absolute;
    bottom: 6px;
    right: 45px;
    box-shadow: 1px 1px 3px rgba(0,0,0,0.4);
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.chalk-eraser:hover {
    transform: scale(1.1) translateY(-2px);
}

.chalk-eraser.active {
    transform: scale(1.15) translateY(-4px);
    box-shadow: 0 0 10px rgba(59, 130, 246, 0.5), 1px 2px 4px rgba(0,0,0,0.4);
    border: 1.5px solid #00f5d4;
}

/* 2. Academic Notice Info Panel */
.academic-info-panel {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-bottom: 2rem;
    width: 100%;
}

.academic-card {
    background: rgba(254, 250, 224, 0.06);
    border: 1px solid rgba(212, 175, 55, 0.15);
    border-radius: 10px;
    padding: 0.75rem 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.3rem;
    min-width: 140px;
    backdrop-filter: blur(8px);
    box-shadow: 0 8px 16px rgba(0,0,0,0.2);
    transition: transform var(--transition-speed);
}

.academic-card:hover {
    transform: translateY(-2px);
    border-color: rgba(212, 175, 55, 0.4);
}

.info-card-icon {
    font-size: 1.1rem;
    color: #eab308; /* Vintage Gold */
    filter: drop-shadow(0 0 3px rgba(234, 179, 8, 0.3));
}

.info-card-label {
    font-family: var(--font-mono);
    font-size: 0.55rem;
    color: var(--text-muted);
    letter-spacing: 1px;
}

.info-card-value {
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 700;
    color: #ffffff;
    letter-spacing: 0.5px;
}

.info-card-value.status-locked {
    color: #f87171;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

.info-card-value.status-unlocked {
    color: #34d399;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    filter: drop-shadow(0 0 4px rgba(52, 211, 153, 0.4));
}

/* 3. Subtitle & Buttons adjustments */
.school-subtitle {
    font-family: var(--font-body);
    font-size: 1.05rem;
    color: var(--text-muted);
    line-height: 1.6;
    max-width: 580px;
    margin: 0 auto 2.5rem auto;
    text-align: center;
    font-weight: 400;
}

.school-btn {
    background: rgba(255, 255, 255, 0.07);
    border: 1px solid rgba(255, 255, 255, 0.16);
    color: #ffffff;
    padding: 1rem 2.4rem;
    font-weight: 600;
    font-size: 1.05rem;
    letter-spacing: 1.5px;
    border-radius: 12px;
    backdrop-filter: blur(20px) saturate(120%);
    -webkit-backdrop-filter: blur(20px) saturate(120%);
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.25),
        inset 0 1px 1px rgba(255, 255, 255, 0.15);
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.8rem;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
    position: relative;
    overflow: hidden;
}

.school-btn .btn-glow {
    position: absolute;
    top: 0;
    left: -100%;
    width: 60%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.18),
        transparent
    );
    transform: skewX(-25deg);
    pointer-events: none;
}

.school-btn:hover .btn-glow {
    animation: shimmer 1.5s ease-in-out infinite;
}

.school-btn:hover {
    background: rgba(255, 255, 255, 0.14);
    border-color: rgba(255, 255, 255, 0.35);
    color: #ffffff;
    box-shadow: 
        0 12px 40px rgba(0, 245, 212, 0.15),
        inset 0 1px 1px rgba(255, 255, 255, 0.25);
    transform: translateY(-2px);
}

.school-btn:hover #unlock-btn-icon {
    animation: keyWiggle 0.5s ease-in-out infinite;
}

.school-btn:active {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.1);
    transform: translateY(0);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.school-btn.unlocking {
    animation: cabinetUnlockShake 0.65s ease-in-out;
    background: linear-gradient(135deg, rgba(0, 245, 212, 0.2), rgba(59, 130, 246, 0.2)) !important;
    border-color: var(--primary) !important;
    color: var(--primary) !important;
    box-shadow: 
        0 0 35px rgba(0, 245, 212, 0.45),
        inset 0 1px 1px rgba(255, 255, 255, 0.2) !important;
    text-shadow: 0 0 8px rgba(0, 245, 212, 0.6);
}

.school-btn.unlocking #unlock-btn-icon {
    animation: keyRotatePress 0.65s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

@keyframes shimmer {
    100% { left: 160%; }
}

@keyframes keyWiggle {
    0%, 100% { transform: rotate(0deg); }
    25% { transform: rotate(-15deg); }
    75% { transform: rotate(15deg); }
}

@keyframes keyRotatePress {
    0% { transform: rotate(0deg) scale(1); }
    50% { transform: rotate(90deg) scale(1.35); filter: drop-shadow(0 0 8px var(--primary)); }
    100% { transform: rotate(90deg) scale(1); }
}

@keyframes cabinetUnlockShake {
    0%, 100% { transform: translateY(0); }
    10%, 30%, 50%, 70%, 90% { transform: translate(-3px, -1px) rotate(-0.5deg); }
    20%, 40%, 60%, 80% { transform: translate(3px, 1px) rotate(0.5deg); }
}

/* Header Decrypt Mode indicator style */
.header-status.secure-session {
    border-color: var(--primary);
    background: rgba(0, 245, 212, 0.05);
    color: var(--primary);
}

/* SCREEN 1.5: DIVISION / STREAM SELECTION GRID */
.divisions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 1.5rem;
    padding: 0.5rem 0;
}

/* Division cards mirror the teacher-locker-card aesthetic exactly */
.division-card {
    background:
        radial-gradient(
            200px circle at var(--mouse-x, -1000px) var(--mouse-y, -1000px),
            rgba(0, 245, 212, 0.08),
            transparent 80%
        ),
        rgba(17, 24, 39, 0.65);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1), background-color 0.3s, border-color 0.3s;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

/* Same cyan left-bar accent as teacher locker cards */
.division-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--border-color);
    transition: background-color var(--transition-speed);
}

.division-card:hover {
    transform: translateY(-5px);
    background: var(--card-bg-hover);
    border-color: rgba(var(--primary-rgb), 0.4);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3), 0 0 15px rgba(var(--primary-rgb), 0.1);
}

.division-card:hover::before {
    background-color: var(--primary);
}

/* Icon — same as .locker-icon-wrap on teacher cards */
.division-icon-wrap {
    font-size: 2.5rem;
    color: var(--text-muted);
    margin-bottom: 1.25rem;
    transition: all var(--transition-speed);
    /* override any bg-* inline colours */
    background: none !important;
    box-shadow: none !important;
    border-radius: 0 !important;
    width: auto !important;
    height: auto !important;
    display: block;
}

.division-card:hover .division-icon-wrap {
    color: var(--primary);
    transform: scale(1.1);
    filter: drop-shadow(0 0 8px rgba(var(--primary-rgb), 0.4));
}

/* bg-* classes: neutralised — keeping class names in HTML but zeroing styles */
.bg-science,
.bg-commerce,
.bg-10th,
.bg-9th {
    background: none !important;
    box-shadow: none !important;
}

.division-name {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 0.4rem;
    letter-spacing: 0.5px;
}

.division-details {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    line-height: 1.4;
}

/* Gold locker handle — same position as teacher cards */
.division-card .locker-door-handle {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    transform-origin: center center;
}

.division-card:hover .locker-door-handle {
    background: linear-gradient(to right, #a18228, #f5d061, #a18228);
    box-shadow: 0 0 12px rgba(212, 175, 55, 0.6), 1px 3px 6px rgba(0, 0, 0, 0.5);
    transform: translateY(-50%) rotate(-18deg);
}

/* Empty state for divisions with no teachers registered (e.g. Class 9) */
.empty-division-placeholder {
    grid-column: 1 / -1;
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-muted);
}

.empty-division-placeholder h4 {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.empty-division-placeholder p {
    font-size: 0.85rem;
    line-height: 1.6;
    max-width: 340px;
    margin: 0 auto;
}

/* SCREEN 2: TEACHERS SELECTION GRID */
.teachers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.teacher-locker-card {
    background: 
        radial-gradient(
            200px circle at var(--mouse-x, -1000px) var(--mouse-y, -1000px), 
            rgba(0, 245, 212, 0.08), 
            transparent 80%
        ),
        rgba(17, 24, 39, 0.65);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1), background-color 0.3s, border-color 0.3s;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.teacher-locker-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--border-color);
    transition: background-color var(--transition-speed);
}

.teacher-locker-card:hover {
    transform: translateY(-5px);
    background: var(--card-bg-hover);
    border-color: rgba(var(--primary-rgb), 0.4);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3), 0 0 15px rgba(var(--primary-rgb), 0.1);
}

.teacher-locker-card:hover::before {
    background-color: var(--primary);
}

.locker-icon-wrap {
    font-size: 2.5rem;
    color: var(--text-muted);
    margin-bottom: 1.25rem;
    transition: all var(--transition-speed);
}

.teacher-locker-card:hover .locker-icon-wrap {
    color: var(--primary);
    transform: scale(1.1);
    filter: drop-shadow(0 0 8px rgba(var(--primary-rgb), 0.4));
}

.teacher-name {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.4rem;
}

.teacher-title {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.locker-door-handle {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    width: 12px;
    height: 45px;
    background: linear-gradient(to right, #8a6d1c, #d4af37, #8a6d1c);
    border: 1px solid rgba(0,0,0,0.5);
    border-radius: 3px;
    box-shadow: 
        1px 2px 4px rgba(0,0,0,0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
    transform-origin: center center;
}

.teacher-locker-card:hover .locker-door-handle {
    background: linear-gradient(to right, #a18228, #f5d061, #a18228);
    box-shadow: 
        0 0 12px rgba(212, 175, 55, 0.6),
        1px 3px 6px rgba(0,0,0,0.5);
    transform: translateY(-50%) rotate(-18deg);
}

/* SCREEN 3: CLASSES SELECTION GRID */
.classes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 3.5rem 1.75rem;
    padding: 1.5rem 0.5rem;
}

.class-shelf-card {
    background: 
        radial-gradient(
            200px circle at var(--mouse-x, -1000px) var(--mouse-y, -1000px), 
            rgba(59, 130, 246, 0.1), 
            transparent 80%
        ),
        rgba(17, 24, 39, 0.65);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.75rem;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    cursor: pointer;
    transition: all var(--transition-speed) ease, background-color 0.3s, border-color 0.3s;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    position: relative;
    z-index: 2;
}

.class-shelf-card::after {
    content: "";
    position: absolute;
    bottom: -15px;
    left: -4%;
    width: 108%;
    height: 10px;
    background: linear-gradient(to bottom, #72461f, #4d2f13);
    border-top: 2px solid #a36f3c;
    border-radius: 4px;
    box-shadow: 
        0 4px 6px rgba(0,0,0,0.45),
        0 8px 16px rgba(0,0,0,0.25);
    z-index: 1;
    transition: all var(--transition-speed) ease;
}

.shelf-bracket {
    position: absolute;
    bottom: -24px;
    width: 8px;
    height: 10px;
    background: linear-gradient(to right, #4b5563, #1f2937, #4b5563);
    border-radius: 0 0 2px 2px;
    box-shadow: 1px 2px 4px rgba(0,0,0,0.5);
    z-index: 0;
    transition: transform var(--transition-speed) ease;
}

.shelf-bracket.left {
    left: 8%;
}

.shelf-bracket.right {
    right: 8%;
}

.class-shelf-card:hover .shelf-bracket {
    transform: translateY(5px);
}

.class-shelf-card:hover {
    border-color: var(--secondary);
    background: var(--card-bg-hover);
    box-shadow: 
        0 12px 25px rgba(0, 0, 0, 0.4), 
        0 0 15px rgba(var(--secondary-rgb), 0.15);
    transform: translateY(-8px);
}

.class-shelf-card:hover::after {
    transform: translateY(5px);
    box-shadow: 
        0 6px 12px rgba(0,0,0,0.5),
        0 10px 20px rgba(0,0,0,0.3);
}

.class-shelf-icon {
    font-size: 1.8rem;
    color: var(--secondary);
    margin-bottom: 1rem;
}

.class-shelf-title {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.class-shelf-details {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* SCREEN 4: PORTAL LAYOUT */
.portal-layout {
    display: grid;
    grid-template-columns: 240px 1fr 400px;
    gap: 1.5rem;
    height: calc(100vh - 200px); /* Fill space between header and footer */
}

/* 1. Portal Sidebar */
.portal-sidebar {
    background: rgba(17, 24, 39, 0.4);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.sidebar-title {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 1px;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}

.category-tabs {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.tab-btn {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: transparent;
    border: 1px solid transparent;
    border-radius: 8px;
    padding: 0.75rem 1rem;
    color: var(--text-muted);
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.9rem;
    text-align: left;
    cursor: pointer;
    transition: all var(--transition-speed) cubic-bezier(0.2, 0.8, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.tab-btn::before {
    content: '';
    position: absolute;
    left: 0;
    top: 20%;
    height: 60%;
    width: 3px;
    background: var(--primary);
    border-radius: 0 4px 4px 0;
    transform: scaleY(0);
    transition: transform 0.25s ease;
}

.tab-btn:hover {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.03);
}

.tab-btn.active {
    color: var(--primary);
    background: rgba(0, 245, 212, 0.08);
    border-color: rgba(0, 245, 212, 0.12);
    padding-left: 1.25rem;
}

.tab-btn.active::before {
    transform: scaleY(1);
}

.tab-icon {
    font-size: 1rem;
}

.sidebar-info-box {
    margin-top: auto;
    background: rgba(255, 255, 255, 0.02);
    border: 1px dashed var(--border-color);
    padding: 1rem;
    border-radius: 8px;
}

.info-title {
    font-size: 0.8rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--secondary);
    margin-bottom: 0.4rem;
}

.info-text {
    font-size: 0.75rem;
    color: var(--text-muted);
    line-height: 1.4;
}

/* 2. Portal Middle Column (Chapters list) */
.portal-content {
    background: rgba(17, 24, 39, 0.4);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.content-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

.category-title {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
}

.chapter-count {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
}

.chapters-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.chapter-section-divider {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--secondary);
    letter-spacing: 2px;
    text-transform: uppercase;
    margin: 1.25rem 0 0.25rem 0;
    padding-bottom: 0.4rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
}

.chapter-section-divider i {
    font-size: 0.95rem;
}

.chapter-card {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem 1.25rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all var(--transition-speed);
}

.chapter-card:hover {
    background: rgba(255, 255, 255, 0.04);
    border-color: rgba(255, 255, 255, 0.15);
}

.chapter-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    padding-right: 1rem;
    flex: 1;
}

.chapter-badge {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--primary);
    font-weight: 600;
}

.chapter-name {
    font-size: 0.95rem;
    font-weight: 600;
}

.chapter-desc {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.chapter-actions-wrapper {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    flex-shrink: 0;
}

.chapter-actions-wrapper .btn {
    min-width: auto;
}

.chapter-actions-wrapper .open-pdf-btn {
    padding: 0.55rem 1rem;
    font-size: 0.85rem;
    min-width: 90px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    text-transform: uppercase;
}

.chapter-actions-wrapper .open-pdf-btn:hover {
    background: rgba(0, 245, 212, 0.08);
    border-color: var(--primary);
    color: var(--primary);
}

.chapter-actions-wrapper .download-pdf-btn {
    width: 36px;
    height: 36px;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    transition: all var(--transition-speed);
}

.chapter-actions-wrapper .download-pdf-btn:hover {
    background: rgba(59, 130, 246, 0.1);
    border-color: var(--secondary);
    color: var(--secondary);
    transform: translateY(-1px);
}

@media (max-width: 600px) {
    .chapter-card {
        flex-direction: column;
        align-items: flex-start !important;
        gap: 1rem;
        padding: 1.25rem 1rem !important;
    }
    .chapter-actions-wrapper {
        width: 100%;
        justify-content: flex-end;
    }
}

/* 3. Portal Right Column (PDF Viewer) */
.portal-viewer {
    background: rgba(17, 24, 39, 0.5);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.viewer-header {
    padding: 1rem 1.25rem;
    background: rgba(0, 0, 0, 0.2);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.viewer-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-main);
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
}

.pdf-header-icon {
    color: #ef4444;
}

.viewer-body {
    flex: 1;
    position: relative;
    background: #111827;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.viewer-loader {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: #111827;
    z-index: 4;
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    gap: 1rem;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(0, 245, 212, 0.15);
    border-radius: 50%;
    border-top-color: var(--primary);
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.viewer-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    text-align: center;
    z-index: 5;
    background: #111827;
}

.placeholder-icon-container {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
    animation: placeholderPulse 3s infinite ease-in-out;
}

@keyframes placeholderPulse {
    0%, 100% { transform: scale(1); opacity: 0.6; }
    50% { transform: scale(1.05); opacity: 1; color: var(--primary); }
}

.viewer-placeholder h4 {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.viewer-placeholder p {
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.5;
    max-width: 250px;
}

.pdf-iframe-hidden {
    display: none;
}

.pdf-iframe-visible {
    display: block;
    width: 100%;
    height: 100%;
    border: none;
}

/* Modals General Style (Glassmorphic) */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(3, 7, 18, 0.7);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1.5rem;
}

.modal-overlay.active {
    display: flex;
}

.modal-card {
    background: rgba(17, 24, 39, 0.95);
    border: 1px solid rgba(255, 255, 255, 0.15);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.8), 0 0 30px rgba(var(--primary-rgb), 0.1);
    border-radius: 16px;
    width: 100%;
    max-width: 600px;
    overflow: hidden;
    animation: modalSlideUp 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.modal-card.modal-small {
    max-width: 400px;
}

@keyframes modalSlideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    padding: 1.25rem 1.5rem;
    background: rgba(0, 0, 0, 0.2);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary);
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    transition: color var(--transition-speed);
}

.modal-close:hover {
    color: #ef4444;
}

.modal-body {
    padding: 1.5rem;
}

/* Forms styling */
.form-group-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    margin-bottom: 1rem;
}

.form-group label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-group input, 
.form-group select {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.65rem 0.85rem;
    color: var(--text-main);
    font-family: var(--font-body);
    font-size: 0.9rem;
    transition: all var(--transition-speed);
    outline: none;
}

.form-group input:focus, 
.form-group select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 8px rgba(var(--primary-rgb), 0.3);
}

.form-group select option {
    background-color: var(--bg-dark);
    color: var(--text-main);
}

/* Drag-and-drop zone */
.file-drop-zone {
    border: 2px dashed var(--border-color);
    background: rgba(255, 255, 255, 0.01);
    border-radius: 8px;
    padding: 2rem 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-speed);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.file-drop-zone:hover, .file-drop-zone.dragover {
    border-color: var(--primary);
    background: rgba(var(--primary-rgb), 0.03);
}

.file-drop-zone .file-icon {
    font-size: 2.2rem;
    color: var(--text-muted);
    transition: color var(--transition-speed);
}

.file-drop-zone:hover .file-icon {
    color: var(--primary);
}

.drop-text {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.drop-text span {
    color: var(--primary);
    font-weight: 600;
    text-decoration: underline;
}

.selected-filename {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--secondary);
    word-break: break-all;
    margin-top: 0.25rem;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    margin-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    padding-top: 1.25rem;
}

/* Simulated login styling */
.login-instruction {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.5;
    margin-bottom: 1.25rem;
}

.error-msg {
    color: #f87171;
    font-size: 0.8rem;
    margin-top: 0.5rem;
    background: rgba(239, 68, 68, 0.1);
    padding: 0.5rem;
    border-radius: 4px;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

/* Footer Styling */
.vault-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: rgba(11, 15, 25, 0.9);
    border-top: 1px solid var(--border-color);
    font-size: 0.75rem;
    color: var(--text-muted);
    position: relative;
    z-index: 100;
}

.footer-badge {
    background: rgba(255, 255, 255, 0.03);
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    font-family: var(--font-mono);
}

/* Default desktop hidden elements */
#pdf-close-viewer-btn {
    display: none;
}

/* Responsive adjustments */
@media (max-width: 1024px) {
    .portal-layout {
        grid-template-columns: 200px 1fr;
        height: auto;
        gap: 1rem;
    }
    
    .portal-viewer {
        grid-column: 1 / -1;
        height: 600px;
        margin-top: 1rem;
    }
}

/* Tablet-specific improvements (768px - 1024px) */
@media (min-width: 769px) and (max-width: 1024px) {
    .divisions-grid,
    .teachers-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .classes-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .portal-sidebar {
        padding: 1rem;
    }
}

@media (max-width: 768px) {
    .header-wrapper {
        top: 0;
    }
    
    .vault-header {
        padding: 0.5rem 1.15rem;
        margin: 0.5rem 0 0 0;
        width: 94%;
        border-radius: 50px;
        flex-direction: row !important;
        justify-content: space-between;
        align-items: center;
        border-color: rgba(255, 255, 255, 0.15) !important;
    }
    
    .logo-text {
        display: none !important; /* Hide ALTED text, show cap icon only */
    }
    
    .user-profile span {
        display: none !important; /* Hide Username text, show user icon only */
    }
    
    .vault-screen {
        padding: 1rem 0.5rem;
    }
    
    .screen-title {
        font-size: 1.6rem !important;
    }
    
    /* Chalkboard mobile compression fixes (prevent cramping) */
    .chalkboard-container {
        max-width: 100% !important;
        margin: 0 auto 1.5rem auto !important;
    }
    
    .chalkboard-frame {
        padding: 8px !important;
    }
    
    .chalkboard-surface {
        padding: 1rem !important;
        min-height: 180px !important;
    }
    
    .chalk-main-title {
        font-size: 1.85rem !important;
    }
    
    .chalk-handwritten {
        font-size: 1.35rem !important;
    }
    
    .chalk-drawings {
        display: none !important; /* Hide drawings to make space for title on narrow viewports */
    }
    
    .chalk-eraser {
        right: 20px;
    }
    
    /* Grid adjustments to prevent cards squeezing */
    .teachers-grid {
        grid-template-columns: 1fr !important;
        gap: 1rem !important;
    }
    
    .classes-grid {
        grid-template-columns: 1fr !important;
        gap: 1rem !important;
    }

    .divisions-grid {
        grid-template-columns: 1fr !important;
        gap: 1rem !important;
    }
    
    .academic-card {
        min-width: 100% !important;
        max-width: 100% !important;
    }
    
    /* Portal Column Layout Toggles to Native Fullscreen Mobile Drawer */
    .portal-layout {
        grid-template-columns: 1fr;
        height: auto;
        gap: 1rem;
    }
    
    .portal-sidebar {
        grid-column: 1;
    }
    
    .portal-content {
        grid-column: 1;
    }
    
    .portal-viewer {
        position: fixed;
        top: 0;
        left: 0;
        width: 100vw;
        height: 100dvh; /* Dynamic viewport height to prevent iOS address bar overlay issues */
        z-index: 9999;
        background: #0b0f19;
        display: flex;
        flex-direction: column;
        transform: translateY(100%);
        transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        margin-top: 0;
        border-radius: 0;
        border: none;
    }
    
    .portal-viewer.active {
        transform: translateY(0);
    }
    
    .portal-viewer iframe {
        -webkit-overflow-scrolling: touch; /* Smooth momentum scroll for iOS Safari */
    }
    
    body.viewer-open {
        overflow: hidden !important; /* Lock background body scroll when PDF viewer overlay is open */
        position: fixed;
        width: 100%;
    }
    
    #pdf-close-viewer-btn {
        display: inline-flex;
    }
    
    #pdf-fullscreen-btn {
        display: inline-flex;
    }
    
    .form-group-row {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .vault-footer {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
        padding: 1.25rem;
    }

    /* =============================================
     * iOS / Mobile Safari Performance Optimizations
     * Disabling backdrop-filter: blur() on mobile
     * prevents GPU overload, jank, and Safari crashes.
     * Replaced with slightly higher-opacity solid fills.
     * ============================================= */
    .vault-header {
        backdrop-filter: none !important;
        -webkit-backdrop-filter: none !important;
        background: rgba(10, 15, 30, 0.96) !important;
    }

    .teacher-locker-card {
        backdrop-filter: none !important;
        -webkit-backdrop-filter: none !important;
        background: rgba(17, 24, 39, 0.92) !important;
    }

    .class-shelf-card {
        backdrop-filter: none !important;
        -webkit-backdrop-filter: none !important;
        background: rgba(17, 24, 39, 0.92) !important;
    }

    .division-card {
        backdrop-filter: none !important;
        -webkit-backdrop-filter: none !important;
        background: rgba(17, 24, 39, 0.94) !important;
    }

    .portal-sidebar,
    .portal-content,
    .portal-viewer {
        backdrop-filter: none !important;
        -webkit-backdrop-filter: none !important;
    }

    .modal-overlay {
        backdrop-filter: none !important;
        -webkit-backdrop-filter: none !important;
        background: rgba(3, 7, 18, 0.92) !important;
    }

    .academic-card {
        backdrop-filter: none !important;
        -webkit-backdrop-filter: none !important;
        background: rgba(20, 20, 40, 0.88) !important;
    }

    /* Reduce scale/translate animations on touch to avoid jank */
    .teacher-locker-card:hover,
    .class-shelf-card:hover,
    .division-card:hover {
        transform: translateY(-3px) !important;
    }

    .btn-primary:hover,
    .btn-secondary:hover {
        transform: none !important;
    }

    /* Disable glow orb heavy blur on mobile to save GPU */
    .glow-orb {
        filter: blur(60px) !important;
        opacity: 0.12 !important;
    }
}

/* Custom Scrollbar Styles */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: #0b0f19;
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.08);
    border-radius: 4px;
    border: 2px solid #0b0f19;
    transition: background 0.3s;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}

.portal-content::-webkit-scrollbar {
    width: 6px;
}

.portal-content::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 3px;
    border: 1px solid #111827;
}

.portal-content::-webkit-scrollbar-thumb:hover {
    background: var(--secondary);
}