/* =====================================================
   Kru Nop Landing Page - Premium Dark Theme
   Complete Styles for All Sections
   ===================================================== */

/* CSS Custom Properties */
:root {
    /* Colors */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a24;
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #6b6b7b;
    --accent-cyan: #00d4ff;
    --accent-purple: #a855f7;
    --accent-blue: #3b82f6;
    --accent-pink: #ec4899;
    --accent-green: #10b981;

    /* Gradients */
    --gradient-main: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple), var(--accent-pink));
    --gradient-card: linear-gradient(135deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.05));
    --gradient-text: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));

    /* Glass Effect */
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-bg-hover: rgba(255, 255, 255, 0.06);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);

    /* Typography */
    --font-family: 'Kanit', sans-serif;

    /* Spacing */
    --container-max: 1200px;
    --section-padding: 100px;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Reset & Base Styles */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
}

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

/* =====================================================
   Navigation
   ===================================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: var(--transition-normal);
}

.navbar.scrolled {
    background: rgba(10, 10, 15, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 12px 0;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1.25rem;
}

.logo-icon {
    font-size: 1.5rem;
}

.logo-text {
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 8px;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 10px 18px;
    border-radius: var(--radius-full);
    transition: var(--transition-fast);
    font-weight: 400;
    font-size: 0.95rem;
}

.nav-link:hover {
    color: var(--text-primary);
    background: var(--glass-bg);
}

/* Mobile Menu Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    width: 25px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition-fast);
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* =====================================================
   Animated Background
   ===================================================== */
.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.5;
    animation: float 25s infinite ease-in-out;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: var(--accent-purple);
    top: -200px;
    right: -200px;
}

.orb-2 {
    width: 500px;
    height: 500px;
    background: var(--accent-cyan);
    bottom: -200px;
    left: -200px;
    animation-delay: -8s;
}

.orb-3 {
    width: 400px;
    height: 400px;
    background: var(--accent-pink);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -16s;
}

@keyframes float {

    0%,
    100% {
        transform: translate(0, 0) scale(1);
    }

    25% {
        transform: translate(60px, -60px) scale(1.1);
    }

    50% {
        transform: translate(-40px, 40px) scale(0.9);
    }

    75% {
        transform: translate(-60px, -40px) scale(1.05);
    }
}

/* =====================================================
   Hero Section
   ===================================================== */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 120px 24px 60px;
    position: relative;
}

.hero-content {
    max-width: 800px;
}

.greeting {
    display: inline-block;
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.hero-title {
    font-size: clamp(3.5rem, 15vw, 7rem);
    font-weight: 700;
    line-height: 1;
    margin-bottom: 16px;
}

.name-highlight {
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
}

.hero-subtitle {
    font-size: clamp(1.5rem, 4vw, 2rem);
    color: var(--text-secondary);
    font-weight: 300;
    margin-bottom: 8px;
}

.hero-tagline {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: 40px;
}

.hero-quote {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 24px 32px;
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-quote blockquote {
    font-size: 1rem;
    font-style: italic;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 12px;
}

.hero-quote cite {
    font-size: 0.9rem;
    color: var(--accent-cyan);
    font-style: normal;
}

.hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: var(--radius-full);
    font-family: inherit;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-normal);
    border: none;
}

.btn-primary {
    background: var(--gradient-main);
    color: var(--bg-primary);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 212, 255, 0.3);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--glass-border);
}

.btn-outline:hover {
    border-color: var(--accent-cyan);
    background: rgba(0, 212, 255, 0.1);
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    opacity: 0.6;
    animation: bounce 2s infinite;
}

.scroll-indicator span {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.scroll-arrow {
    width: 24px;
    height: 24px;
    border-right: 2px solid var(--text-muted);
    border-bottom: 2px solid var(--text-muted);
    transform: rotate(45deg);
}

@keyframes bounce {

    0%,
    100% {
        transform: translateX(-50%) translateY(0);
    }

    50% {
        transform: translateX(-50%) translateY(10px);
    }
}

/* =====================================================
   Section Common Styles
   ===================================================== */
.section {
    padding: var(--section-padding) 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-badge {
    display: inline-block;
    padding: 8px 20px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    color: var(--accent-cyan);
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: 16px;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Glass Card */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    transition: var(--transition-normal);
}

.glass-card:hover {
    background: var(--glass-bg-hover);
    border-color: rgba(255, 255, 255, 0.12);
    transform: translateY(-5px);
}

/* =====================================================
   About Section
   ===================================================== */
.about-grid {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 40px;
    align-items: start;
}

.about-card {
    padding: 40px;
    text-align: center;
}

.about-avatar {
    margin-bottom: 24px;
}

.avatar-ring {
    width: 160px;
    height: 160px;
    margin: 0 auto;
    background: var(--gradient-main);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 50px rgba(0, 212, 255, 0.3);
    padding: 4px;
}

.avatar-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center top;
    border-radius: 50%;
    border: 3px solid var(--bg-primary);
}

.avatar-icon {
    font-size: 3.5rem;
}

.about-info h3 {
    font-size: 1.5rem;
    margin-bottom: 8px;
}

.about-role {
    color: var(--accent-cyan);
    font-size: 1rem;
}

.info-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.info-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 24px;
}

.info-icon {
    font-size: 2rem;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
}

.info-content {
    display: flex;
    flex-direction: column;
}

.info-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 4px;
}

.info-value {
    font-size: 1.1rem;
    font-weight: 500;
}

/* =====================================================
   Philosophy Section
   ===================================================== */
.philosophy-section {
    background: linear-gradient(180deg, transparent, rgba(168, 85, 247, 0.03), transparent);
}

.philosophy-content {
    max-width: 900px;
    margin: 0 auto;
}

.philosophy-main {
    padding: 48px;
    text-align: center;
    margin-bottom: 40px;
    position: relative;
}

.quote-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.philosophy-quote {
    font-size: 1.3rem;
    line-height: 1.9;
    color: var(--text-secondary);
    font-style: italic;
}

.philosophy-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.phil-card {
    padding: 32px;
    text-align: center;
}

.phil-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
    display: block;
}

.phil-card h4 {
    font-size: 1.1rem;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.phil-card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* =====================================================
   Approach Section
   ===================================================== */
.approach-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.approach-card {
    padding: 40px;
    position: relative;
    overflow: hidden;
}

.approach-number {
    position: absolute;
    top: 20px;
    right: 24px;
    font-size: 3rem;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.03);
}

.approach-icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
    display: block;
}

.approach-card h4 {
    font-size: 1.25rem;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.approach-card p {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* =====================================================
   Subject Section
   ===================================================== */
.subject-section {
    background: linear-gradient(180deg, transparent, rgba(0, 212, 255, 0.03), transparent);
}

.subject-content {
    max-width: 800px;
    margin: 0 auto;
}

.subject-intro {
    padding: 48px;
    text-align: center;
    margin-bottom: 40px;
}

.subject-icon-large {
    font-size: 4rem;
    margin-bottom: 20px;
    display: block;
}

.subject-intro h3 {
    font-size: 1.5rem;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.subject-intro p {
    color: var(--text-secondary);
    line-height: 1.9;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.skill-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 20px 24px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
}

.skill-item:hover {
    background: var(--glass-bg-hover);
    border-color: var(--accent-cyan);
    transform: translateX(5px);
}

.skill-icon {
    font-size: 1.5rem;
}

.skill-name {
    font-size: 1rem;
    font-weight: 500;
}

/* =====================================================
   Contact Section
   ===================================================== */
.contact-content {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.contact-card {
    padding: 40px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 20px;
}

.contact-icon {
    font-size: 1.5rem;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
}

.contact-text {
    display: flex;
    flex-direction: column;
}

.contact-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 4px;
}

.contact-value {
    font-size: 1.1rem;
    font-weight: 500;
}

.contact-link {
    color: var(--accent-cyan);
    text-decoration: none;
    transition: var(--transition-fast);
}

.contact-link:hover {
    text-decoration: underline;
}

.domain-highlight {
    padding: 32px;
    text-align: center;
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.1), rgba(168, 85, 247, 0.1));
}

.domain-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 12px;
}

.domain-icon {
    font-size: 1.5rem;
}

.domain-url {
    font-size: 1.5rem;
    font-weight: 600;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.domain-tagline {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* =====================================================
   Programs Section
   ===================================================== */
.programs-section {
    background: linear-gradient(180deg, transparent, rgba(59, 130, 246, 0.03), transparent);
}

.programs-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    max-width: 800px;
    margin: 0 auto;
}

.program-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 48px 32px;
    background: rgba(20, 25, 40, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-xl);
    text-decoration: none;
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.program-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.program-examlab::before {
    background: linear-gradient(90deg, #3b82f6, #60a5fa);
}

.program-research::before {
    background: linear-gradient(90deg, #10b981, #34d399);
}

.program-card:hover {
    transform: translateY(-8px);
    border-color: rgba(255, 255, 255, 0.15);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.program-card:hover::before {
    opacity: 1;
}

.program-icon-wrapper {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    transition: var(--transition-normal);
}

.program-icon-blue {
    background: linear-gradient(135deg, #3b82f6, #2563eb);
    box-shadow: 0 8px 24px rgba(59, 130, 246, 0.3);
}

.program-icon-green {
    background: linear-gradient(135deg, #10b981, #059669);
    box-shadow: 0 8px 24px rgba(16, 185, 129, 0.3);
}

.program-card:hover .program-icon-wrapper {
    transform: scale(1.1);
}

.program-svg {
    width: 40px;
    height: 40px;
    color: white;
}

.program-title {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.program-examlab .program-title {
    color: #60a5fa;
}

.program-research .program-title {
    color: #34d399;
}

.program-desc {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.program-subdesc {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 24px;
}

.program-cta {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius-full);
    font-weight: 500;
    transition: var(--transition-normal);
}

.program-examlab .program-cta {
    background: linear-gradient(135deg, #3b82f6, #2563eb);
    color: white;
}

.program-research .program-cta {
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
}

.program-card:hover .program-cta {
    transform: scale(1.05);
}

.program-cta svg {
    transition: transform var(--transition-fast);
}

.program-card:hover .program-cta svg {
    transform: translateX(4px);
}

/* =====================================================
   Footer
   ===================================================== */
.footer {
    padding: 60px 0 40px;
    border-top: 1px solid var(--glass-border);
    background: linear-gradient(to top, rgba(0, 0, 0, 0.3), transparent);
}

.footer-content {
    text-align: center;
}

.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 16px;
}

.footer-logo {
    font-size: 2rem;
}

.footer-name {
    font-size: 1.5rem;
    font-weight: 600;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-quote {
    color: var(--text-secondary);
    font-style: italic;
    margin-bottom: 24px;
}

.footer-divider {
    width: 60px;
    height: 2px;
    background: var(--gradient-main);
    margin: 0 auto 24px;
}

.footer-copyright {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* =====================================================
   Animations
   ===================================================== */
.animate-fade-in {
    animation: fadeIn 1s ease-out;
}

.animate-fade-in-up {
    animation: fadeInUp 1s ease-out;
}

.delay-1 {
    animation-delay: 0.2s;
    animation-fill-mode: both;
}

.delay-2 {
    animation-delay: 0.4s;
    animation-fill-mode: both;
}

.delay-3 {
    animation-delay: 0.6s;
    animation-fill-mode: both;
}

.delay-4 {
    animation-delay: 0.8s;
    animation-fill-mode: both;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Scroll Animations */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* =====================================================
   Responsive
   ===================================================== */
@media (max-width: 992px) {
    .about-grid {
        grid-template-columns: 1fr;
    }

    .philosophy-cards {
        grid-template-columns: 1fr;
    }

    .approach-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 60px;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(10, 10, 15, 0.98);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 20px;
        opacity: 0;
        visibility: hidden;
        transition: var(--transition-normal);
    }

    .nav-menu.active {
        opacity: 1;
        visibility: visible;
    }

    .nav-link {
        font-size: 1.25rem;
        padding: 15px 30px;
    }

    .nav-toggle {
        display: flex;
        z-index: 1001;
    }

    .info-cards {
        grid-template-columns: 1fr;
    }

    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .hero-quote {
        padding: 20px 24px;
    }

    .orb-1 {
        width: 350px;
        height: 350px;
    }

    .orb-2 {
        width: 300px;
        height: 300px;
    }

    .orb-3 {
        width: 250px;
        height: 250px;
    }

    .programs-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
    }

    .program-card {
        padding: 36px 24px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 3rem;
    }

    .skills-grid {
        grid-template-columns: 1fr;
    }

    .btn {
        width: 100%;
    }

    .hero-cta {
        flex-direction: column;
        width: 100%;
        padding: 0 20px;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .orb {
        animation: none;
    }

    html {
        scroll-behavior: auto;
    }
}

/* Focus Styles */
a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--accent-cyan);
    outline-offset: 4px;
}

/* =====================================================
   Worksheet System Styles
   ===================================================== */

/* Login Page */
.ws-login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.ws-login-card {
    width: 100%;
    max-width: 420px;
    padding: 48px 40px;
    text-align: center;
}

.ws-login-icon {
    font-size: 3.5rem;
    margin-bottom: 20px;
    display: block;
}

.ws-login-title {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 8px;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.ws-login-subtitle {
    color: var(--text-muted);
    margin-bottom: 32px;
    font-size: 0.95rem;
}

.ws-login-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.ws-back-link {
    display: inline-block;
    margin-top: 24px;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition-fast);
}

.ws-back-link:hover {
    color: var(--accent-cyan);
}

/* Form Elements */
.ws-form-group {
    text-align: left;
    flex: 1;
}

.ws-label {
    display: block;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
    font-weight: 400;
}

.ws-required {
    color: var(--accent-pink);
}

.ws-input {
    width: 100%;
    padding: 14px 18px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 1rem;
    transition: var(--transition-fast);
    outline: none;
}

.ws-input:focus {
    border-color: var(--accent-cyan);
    background: rgba(0, 212, 255, 0.05);
    box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

.ws-input::placeholder {
    color: var(--text-muted);
}

.ws-select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236b6b7b' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    padding-right: 40px;
}

.ws-select option {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.ws-form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

/* File Upload */
.ws-file-upload {
    position: relative;
    border: 2px dashed rgba(255, 255, 255, 0.12);
    border-radius: var(--radius-md);
    padding: 40px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition-normal);
    background: rgba(255, 255, 255, 0.02);
}

.ws-file-upload:hover,
.ws-file-dragover {
    border-color: var(--accent-cyan);
    background: rgba(0, 212, 255, 0.05);
}

.ws-file-selected {
    border-color: var(--accent-green);
    background: rgba(16, 185, 129, 0.05);
}

.ws-file-input {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}

.ws-file-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    pointer-events: none;
}

.ws-file-icon {
    font-size: 2.5rem;
}

.ws-file-text {
    color: var(--text-secondary);
    font-size: 1rem;
}

.ws-file-hint {
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* Alerts */
.ws-alert {
    padding: 14px 20px;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    margin-bottom: 16px;
}

.ws-alert-page {
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 30px;
    text-align: center;
}

.ws-alert-success {
    background: rgba(16, 185, 129, 0.15);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: #6ee7b7;
}

.ws-alert-error {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #fca5a5;
}

/* Admin Page */
.ws-admin-page {
    padding-top: 120px;
    padding-bottom: 60px;
    min-height: 100vh;
}

.ws-upload-section {
    padding: 40px;
    margin-bottom: 40px;
}

.ws-section-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 28px;
    color: var(--text-primary);
}

.ws-upload-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.ws-btn-full {
    width: 100%;
}

.ws-btn-upload {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    max-width: 300px;
    margin-top: 8px;
}

/* Table */
.ws-table-wrapper {
    padding: 0;
    overflow-x: auto;
}

.ws-table {
    width: 100%;
    border-collapse: collapse;
}

.ws-table th {
    padding: 16px 20px;
    text-align: left;
    font-size: 0.8rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    border-bottom: 1px solid var(--glass-border);
    white-space: nowrap;
}

.ws-table td {
    padding: 16px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    vertical-align: middle;
}

.ws-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.03);
}

.ws-table tbody tr:last-child td {
    border-bottom: none;
}

.ws-file-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.ws-file-type-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.ws-file-title {
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.ws-file-desc {
    color: var(--text-muted);
    font-size: 0.8rem;
    margin-top: 2px;
}

.ws-text-muted {
    color: var(--text-muted);
    font-size: 0.9rem;
    white-space: nowrap;
}

/* Badges */
.ws-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 500;
    white-space: nowrap;
}

.ws-badge-subject {
    background: rgba(0, 212, 255, 0.15);
    color: var(--accent-cyan);
    border: 1px solid rgba(0, 212, 255, 0.2);
}

.ws-badge-level {
    background: rgba(168, 85, 247, 0.15);
    color: var(--accent-purple);
    border: 1px solid rgba(168, 85, 247, 0.2);
}

/* Action Buttons */
.ws-actions {
    display: flex;
    gap: 8px;
}

.ws-btn-action {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-size: 1.1rem;
    transition: var(--transition-fast);
}

.ws-btn-download {
    background: rgba(16, 185, 129, 0.15);
}

.ws-btn-download:hover {
    background: rgba(16, 185, 129, 0.3);
    transform: scale(1.1);
}

.ws-btn-delete {
    background: rgba(239, 68, 68, 0.15);
}

.ws-btn-delete:hover {
    background: rgba(239, 68, 68, 0.3);
    transform: scale(1.1);
}

/* Empty State */
.ws-empty {
    text-align: center;
    padding: 60px 40px;
}

.ws-empty-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: 16px;
}

.ws-empty p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.ws-empty-hint {
    color: var(--text-muted) !important;
    font-size: 0.9rem !important;
    margin-top: 8px;
}

/* =====================================================
   Download Page (Student-facing)
   ===================================================== */
.ws-download-page {
    padding-top: 120px;
    padding-bottom: 40px;
    min-height: 100vh;
}

.ws-nav-active {
    color: var(--accent-cyan) !important;
    background: rgba(0, 212, 255, 0.1);
}

/* Stats */
.ws-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 32px;
}

.ws-stat-card {
    padding: 28px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.ws-stat-icon {
    font-size: 2rem;
}

.ws-stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.ws-stat-label {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Filters */
.ws-filters {
    padding: 20px 24px;
    margin-bottom: 32px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px;
}

.ws-filter-label {
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    margin-right: 4px;
}

.ws-filter-group {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.ws-filter-btn {
    padding: 8px 18px;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-decoration: none;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid transparent;
    transition: var(--transition-fast);
    font-family: var(--font-family);
}

.ws-filter-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--glass-border);
}

.ws-filter-btn.active {
    background: rgba(0, 212, 255, 0.15);
    color: var(--accent-cyan);
    border-color: rgba(0, 212, 255, 0.3);
}

.ws-filter-level.active {
    background: rgba(168, 85, 247, 0.15);
    color: var(--accent-purple);
    border-color: rgba(168, 85, 247, 0.3);
}

/* Worksheet Cards Grid */
.ws-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

.ws-card {
    padding: 32px;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.ws-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-main);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.ws-card:hover::before {
    opacity: 1;
}

.ws-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 16px;
}

.ws-card-icon {
    font-size: 2.5rem;
}

.ws-card-badges {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.ws-card-title {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    line-height: 1.5;
}

.ws-card-desc {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 16px;
    line-height: 1.6;
    flex-grow: 1;
}

.ws-card-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 20px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.ws-card-ext {
    padding: 2px 8px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 4px;
    font-weight: 600;
    font-size: 0.7rem;
    letter-spacing: 0.05em;
}

.ws-download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 24px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
    color: var(--bg-primary);
    font-family: var(--font-family);
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition-normal);
    margin-top: auto;
}

.ws-download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 212, 255, 0.35);
}

.ws-download-btn:active {
    transform: translateY(0);
}

/* =====================================================
   Worksheet Responsive
   ===================================================== */
@media (max-width: 768px) {
    .ws-form-row {
        grid-template-columns: 1fr;
    }

    .ws-stats {
        grid-template-columns: repeat(3, 1fr);
        gap: 12px;
    }

    .ws-stat-card {
        padding: 20px 12px;
    }

    .ws-stat-number {
        font-size: 1.8rem;
    }

    .ws-cards-grid {
        grid-template-columns: 1fr;
    }

    .ws-upload-section {
        padding: 24px;
    }

    .ws-filters {
        padding: 16px;
    }

    .ws-table th,
    .ws-table td {
        padding: 12px 14px;
    }

    .ws-login-card {
        padding: 36px 28px;
    }
}

@media (max-width: 480px) {
    .ws-stat-card {
        padding: 16px 8px;
    }

    .ws-stat-number {
        font-size: 1.5rem;
    }

    .ws-stat-label {
        font-size: 0.75rem;
    }

    .ws-file-upload {
        padding: 24px;
    }

    .ws-card {
        padding: 24px;
    }
}