:root {
    --primary-color: #ff6b35;
    --secondary-color: #004e89;
    --accent-color: #ffd23f;
    --success-color: #06a77d;
    --danger-color: #d62828;
    --text-color: #2c3e50;
    --text-light: #7f8c8d;
    --bg-color: #f8f9fa;
    --card-bg: #ffffff;
    --border-color: #ecf0f1;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.15);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
}

/* ===== ANIMATIONS ===== */
@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-20px);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes bounceIn {
    0% {
        opacity: 0;
        transform: scale(0.8);
    }
    50% {
        opacity: 1;
    }
    100% {
        transform: scale(1);
    }
}

.slide-in {
    animation: slideIn 0.8s ease-out;
}

.fade-in {
    animation: fadeIn 1s ease-out;
}

.pulse {
    animation: pulse 2s infinite;
}

.float {
    animation: float 3s ease-in-out infinite;
}

/* ===== NAVBAR ===== */
.navbar {
    background: linear-gradient(135deg, var(--secondary-color) 0%, #003366 100%);
    color: white;
    padding: 1.5rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
    backdrop-filter: blur(10px);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 3rem;
}

.logo-section {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.logo {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: 1px;
    animation: slideInLeft 0.6s ease-out;
}

.tagline {
    font-size: 0.85rem;
    opacity: 0.9;
    font-weight: 300;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2.5rem;
    align-items: center;
}

/* Mobile nav toggle (hidden on desktop) */
.nav-toggle {
    display: none;
    background: transparent;
    border: none;
    color: white;
    cursor: pointer;
    width: 44px;
    height: 44px;
    align-items: center;
    justify-content: center;
}
.nav-toggle .hamburger {
    display: block;
    width: 22px;
    height: 2px;
    background: white;
    position: relative;
    transition: all 0.25s ease;
}
.nav-toggle .hamburger::before,
.nav-toggle .hamburger::after {
    content: '';
    position: absolute;
    left: 0;
    width: 22px;
    height: 2px;
    background: white;
    transition: transform 0.25s ease, top 0.25s ease, bottom 0.25s ease, opacity 0.25s ease;
}
.nav-toggle .hamburger::before { top: -7px; }
.nav-toggle .hamburger::after { bottom: -7px; }
.nav-toggle[aria-expanded="true"] .hamburger { background: transparent; }
.nav-toggle[aria-expanded="true"] .hamburger::before { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .hamburger::after { transform: translateY(-7px) rotate(-45deg); }

.nav-menu.open {
    display: flex;
}

/* Make images and media fluid */
img, picture, video, svg {
    max-width: 100%;
    height: auto;
    display: block;
}

.nav-link {
    color: white;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    position: relative;
    transition: all 0.3s ease;
    padding: 0.5rem 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

.admin-link {
    background: var(--accent-color);
    color: var(--secondary-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    transition: all 0.3s ease;
}

.admin-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 210, 63, 0.3);
}

/* ===== HERO SECTION ===== */
.hero-section {
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 4rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
    gap: 3rem;
}

.hero-content {
    flex: 1;
    z-index: 2;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    color: var(--secondary-color);
    animation: slideIn 0.8s ease-out;
}

.hero-subtitle {
    font-size: 1.3rem;
    color: var(--text-light);
    margin-bottom: 2rem;
    animation: fadeIn 1s ease-out 0.2s both;
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
    animation: slideIn 1s ease-out 0.4s both;
}

.hero-illustration {
    flex: 1;
    position: relative;
    height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.floating-shapes {
    position: relative;
    width: 100%;
    height: 100%;
}

.shape {
    position: absolute;
    font-size: 5rem;
    font-weight: 700;
    color: var(--primary-color);
    opacity: 0.7;
    border-radius: 20px;
    background: white;
    width: 120px;
    height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow);
    animation: float 4s ease-in-out infinite;
}

.shape-1 {
    top: 10%;
    left: 10%;
    animation-delay: 0s;
}

.shape-2 {
    top: 30%;
    right: 10%;
    animation-delay: 1s;
}

.shape-3 {
    bottom: 10%;
    left: 30%;
    animation-delay: 2s;
}

/* ===== MAIN CONTAINER ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* ===== SECTIONS ===== */
.section {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 4rem 2rem;
    margin-bottom: 4rem;
    box-shadow: var(--shadow);
    animation: slideIn 1s ease-out;
    scroll-margin-top: 100px;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
    animation: slideIn 0.8s ease-out;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-light);
    animation: fadeIn 1s ease-out 0.2s both;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-block;
    padding: 0.8rem 1.8rem;
    border-radius: 10px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: all 0.3s ease;
    font-size: 1rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, #ff5722 100%);
    color: white;
    box-shadow: 0 5px 15px rgba(255, 107, 53, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(255, 107, 53, 0.4);
}

.btn-secondary {
    background: white;
    color: var(--secondary-color);
    border: 2px solid var(--secondary-color);
}

.btn-secondary:hover {
    background: var(--secondary-color);
    color: white;
    transform: translateY(-3px);
}

/* ===== ALPHABET SECTION ===== */
.filter-tabs {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.8rem 1.5rem;
    border: 2px solid var(--border-color);
    background: white;
    border-radius: 25px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
    color: var(--text-color);
}

.filter-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
}

.filter-btn.active {
    background: linear-gradient(135deg, var(--primary-color) 0%, #ff5722 100%);
    color: white;
    border-color: transparent;
    box-shadow: 0 5px 15px rgba(255, 107, 53, 0.3);
}

.alphabet-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 1.5rem;
    animation: slideIn 1s ease-out 0.2s both;
}

.alphabet-card {
    background: linear-gradient(135deg, white 0%, #f8f9fa 100%);
    border: 2px solid var(--border-color);
    border-radius: 15px;
    padding: 2rem 1rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    animation: bounceIn 0.6s ease-out;
}

.alphabet-card:hover {
    transform: translateY(-8px);
    border-color: var(--primary-color);
    box-shadow: 0 10px 30px rgba(255, 107, 53, 0.2);
    background: linear-gradient(135deg, var(--accent-color) 0%, #ffe58f 100%);
}

.devanagari {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    font-family: 'Noto Sans Devanagari', serif;
    margin-bottom: 0.5rem;
}

.romanized {
    font-size: 0.9rem;
    color: var(--text-light);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.pronunciation {
    font-size: 0.8rem;
    color: var(--secondary-color);
    font-style: italic;
}

/* ===== PHRASES SECTION ===== */
.phrases-controls {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.control-input {
    flex: 1;
    min-width: 200px;
    padding: 0.8rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-family: 'Poppins', sans-serif;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.control-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.1);
}

.phrases-container {
    display: grid;
    gap: 1.5rem;
    animation: slideIn 1s ease-out 0.2s both;
}

.phrase-card {
    background: linear-gradient(135deg, #f8f9fa 0%, white 100%);
    border-left: 4px solid var(--primary-color);
    border-radius: 10px;
    padding: 1.5rem;
    transition: all 0.3s ease;
    animation: slideInLeft 0.6s ease-out;
}

.phrase-card:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow);
    background: linear-gradient(135deg, white 0%, #f8f9fa 100%);
}

.phrase-nepali {
    font-size: 1.5rem;
    font-family: 'Noto Sans Devanagari', serif;
    color: var(--secondary-color);
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.phrase-romanized {
    font-size: 1rem;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.phrase-english {
    font-size: 1rem;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

.phrase-category {
    display: inline-block;
    background: var(--accent-color);
    color: var(--text-color);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

/* ===== TRANSLITERATOR SECTION ===== */
.transliterator-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: start;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.input-group label {
    font-weight: 600;
    color: var(--secondary-color);
}

.textarea-input {
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-family: 'Poppins', sans-serif;
    font-size: 1rem;
    min-height: 150px;
    resize: vertical;
    transition: all 0.3s ease;
}

.textarea-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.1);
}

.output-box {
    background: linear-gradient(135deg, #f8f9fa 0%, white 100%);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    padding: 2rem;
    min-height: 150px;
    font-size: 1.8rem;
    font-family: 'Noto Sans Devanagari', serif;
    color: var(--secondary-color);
    font-weight: 700;
    word-wrap: break-word;
    word-break: break-all;
    animation: fadeIn 0.5s ease-out;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .hero-section {
        flex-direction: column;
        padding: 2rem 1rem;
        min-height: 60vh;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    /* hide menu by default on small screens; show when .open class applied */
    .nav-menu {
        display: none;
        width: 100%;
        flex-direction: column;
        gap: 1rem;
        align-items: center;
        padding: 1rem 0;
    }

    .nav-menu.open {
        display: flex;
    }

    .section {
        padding: 2rem 1rem;
        margin-bottom: 2rem;
    }

    .section-title {
        font-size: 1.8rem;
    }

    .alphabet-grid {
        grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
        gap: 1rem;
    }

    .transliterator-container {
        grid-template-columns: 1fr;
    }

    .phrases-controls {
        flex-direction: column;
    }

    .control-input {
        min-width: auto;
    }

    .dictionary-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }

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

/* ===== DICTIONARY SECTION ===== */
.dictionary-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.word-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    border-left: 4px solid var(--primary-color);
}

.word-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.word-nepali {
    font-family: 'Noto Sans Devanagari', sans-serif;
    font-size: 2rem;
    font-weight: 700;
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
}

.word-romanized {
    font-size: 0.95rem;
    color: var(--text-light);
    font-style: italic;
    margin-bottom: 0.5rem;
}

.word-english {
    font-size: 1.2rem;
    color: var(--text-color);
    font-weight: 500;
    margin-bottom: 1rem;
}

.word-meta {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.word-badge {
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.badge-category {
    background: #e3f2fd;
    color: #1976d2;
}

.badge-difficulty {
    background: #f3e5f5;
    color: #7b1fa2;
}

.badge-difficulty.beginner {
    background: #e8f5e9;
    color: #2e7d32;
}

.badge-difficulty.intermediate {
    background: #fff3e0;
    color: #e65100;
}

.badge-difficulty.advanced {
    background: #ffebee;
    color: #c62828;
}

/* ===== VIDEOS SECTION ===== */
.videos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.video-card {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    cursor: pointer;
}

.video-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.video-thumbnail {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    height: 0;
    overflow: hidden;
    background: #000;
}

.video-thumbnail img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: opacity 0.3s ease;
}

.video-card:hover .video-thumbnail img {
    opacity: 0.8;
}

.play-button-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
    transition: transform 0.3s ease;
    opacity: 0.9;
}

.video-card:hover .play-button-overlay {
    transform: translate(-50%, -50%) scale(1.1);
    opacity: 1;
}

.video-duration {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
}

.video-info {
    padding: 1.5rem;
}

.video-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.video-description {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 1rem;
    line-height: 1.5;
}

.video-meta {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.pagination-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-top: 2rem;
}

.pagination-controls button {
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 8px;
    background: var(--secondary-color);
    color: white;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.pagination-controls button:hover:not(:disabled) {
    background: var(--primary-color);
    transform: scale(1.05);
}

.pagination-controls button:disabled {
    background: #ccc;
    cursor: not-allowed;
    opacity: 0.5;
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.5rem;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .alphabet-grid {
        grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
        gap: 0.8rem;
    }

    .devanagari {
        font-size: 2rem;
    }

    .nav-menu {
        gap: 0.5rem;
        font-size: 0.8rem;
    }
}