/* ===================================
   Language Learning Hub - Main Styles
   =================================== */

/* Custom Properties / Design Tokens */
:root {
    /* Color Palette - Inspired by dawn and learning */
    --color-primary: #5B4E8C;      /* Deep purple - wisdom */
    --color-primary-light: #7B6EAC;
    --color-primary-dark: #3B2E6C;

    --color-accent: #E8B04B;       /* Golden - achievement */
    --color-accent-light: #F0C66B;
    --color-accent-dark: #C89A3B;

    --color-secondary: #4A8B8C;    /* Teal - growth */
    --color-secondary-light: #6AAAAC;
    --color-secondary-dark: #2A6B6C;

    /* Neutral Colors */
    --color-dark: #1A1625;
    --color-dark-soft: #2D2838;
    --color-gray-900: #3F3A4B;
    --color-gray-700: #5E5869;
    --color-gray-500: #8E8896;
    --color-gray-300: #C4BFC9;
    --color-gray-100: #F0EEF2;
    --color-white: #FFFFFF;
    --color-off-white: #FAF9FB;

    /* Typography */
    --font-display: 'Crimson Text', serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Font Sizes - Fluid Typography */
    --fs-hero: clamp(2.5rem, 5vw + 1rem, 4.5rem);
    --fs-h1: clamp(2rem, 4vw + 1rem, 3.5rem);
    --fs-h2: clamp(1.75rem, 3vw + 0.5rem, 2.5rem);
    --fs-h3: clamp(1.25rem, 2vw + 0.5rem, 1.75rem);
    --fs-body: clamp(1rem, 1vw + 0.75rem, 1.125rem);
    --fs-small: 0.875rem;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4.5rem;
    --space-3xl: 6rem;

    /* Layout */
    --container-max: 1200px;
    --container-padding: clamp(1rem, 5vw, 2rem);

    /* Animation */
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 600ms cubic-bezier(0.4, 0, 0.2, 1);

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(26, 22, 37, 0.08);
    --shadow-md: 0 4px 12px rgba(26, 22, 37, 0.12);
    --shadow-lg: 0 8px 24px rgba(26, 22, 37, 0.16);
    --shadow-xl: 0 16px 48px rgba(26, 22, 37, 0.24);

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.625rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
}

/* ===================================
   Base Styles / Reset
   =================================== */

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    font-size: var(--fs-body);
    line-height: 1.6;
    color: var(--color-dark);
    background: var(--color-off-white);
    overflow-x: hidden;
}

/* Typography Base */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.2;
    color: var(--color-dark);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-base);
}

a:hover {
    color: var(--color-primary-light);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ===================================
   Navigation
   =================================== */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(250, 249, 251, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(196, 191, 201, 0.2);
    z-index: 1000;
    transition: transform var(--transition-base),
                box-shadow var(--transition-base);
}

.nav.scrolled {
    box-shadow: var(--shadow-md);
}

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

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-weight: 600;
    font-size: 1.25rem;
    color: var(--color-dark);
    transition: transform var(--transition-base);
}

.nav-logo:hover {
    transform: translateY(-2px);
    color: var(--color-dark);
}

.logo-icon {
    font-size: 1.5rem;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-3px); }
}

.logo-text {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--space-lg);
}

.nav-link {
    position: relative;
    color: var(--color-gray-700);
    font-weight: 500;
    padding: var(--space-xs) 0;
    transition: color var(--transition-base);
}

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

.nav-link:hover {
    color: var(--color-dark);
}

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

/* Mobile Navigation Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 28px;
    height: 24px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
}

.nav-toggle span {
    width: 100%;
    height: 3px;
    background: var(--color-dark);
    border-radius: 2px;
    transition: all var(--transition-base);
}

/* ===================================
   Hero Section
   =================================== */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-3xl) var(--container-padding);
    margin-top: 60px;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    inset: 0;
    z-index: -1;
}

.hero-gradient {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        135deg,
        rgba(91, 78, 140, 0.05) 0%,
        rgba(74, 139, 140, 0.05) 50%,
        rgba(232, 176, 75, 0.05) 100%
    );
}

.hero-pattern {
    position: absolute;
    inset: 0;
    opacity: 0.03;
    background-image:
        repeating-linear-gradient(45deg, transparent, transparent 35px, rgba(91, 78, 140, 0.5) 35px, rgba(91, 78, 140, 0.5) 70px),
        repeating-linear-gradient(-45deg, transparent, transparent 35px, rgba(74, 139, 140, 0.5) 35px, rgba(74, 139, 140, 0.5) 70px);
}

.hero-content {
    max-width: 800px;
    text-align: center;
    animation: fadeInUp 1s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-title {
    margin-bottom: var(--space-lg);
}

.hero-subtitle {
    display: block;
    font-size: var(--fs-h3);
    font-weight: 400;
    color: var(--color-gray-700);
    margin-bottom: var(--space-xs);
    font-family: var(--font-body);
}

.hero-main {
    display: block;
    font-size: var(--fs-hero);
    font-weight: 600;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: var(--space-xs);
}

.hero-accent {
    display: block;
    font-size: var(--fs-h2);
    font-weight: 400;
    color: var(--color-accent-dark);
    font-style: italic;
}

.hero-description {
    font-size: 1.25rem;
    color: var(--color-gray-700);
    margin-bottom: var(--space-xl);
    line-height: 1.7;
}

/* Quick Search */
.quick-search {
    display: flex;
    max-width: 500px;
    margin: 0 auto var(--space-xl);
    background: var(--color-white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    transition: transform var(--transition-base);
}

.quick-search:focus-within {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.search-input {
    flex: 1;
    padding: var(--space-md) var(--space-lg);
    border: none;
    background: transparent;
    font-size: 1rem;
    color: var(--color-dark);
}

.search-input:focus {
    outline: none;
}

.search-input::placeholder {
    color: var(--color-gray-500);
}

.search-button {
    padding: 0 var(--space-lg);
    background: var(--color-primary);
    border: none;
    color: var(--color-white);
    cursor: pointer;
    transition: background var(--transition-base);
}

.search-button:hover {
    background: var(--color-primary-dark);
}

/* Popular Languages Pills */
.popular-languages {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.popular-label {
    color: var(--color-gray-700);
    font-size: var(--fs-small);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.language-pills {
    display: flex;
    gap: var(--space-xs);
    flex-wrap: wrap;
    justify-content: center;
}

.pill {
    padding: var(--space-xs) var(--space-md);
    background: var(--color-white);
    border: 2px solid transparent;
    border-radius: var(--radius-xl);
    font-size: var(--fs-small);
    font-weight: 500;
    color: var(--color-dark);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.pill::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    opacity: 0;
    transition: opacity var(--transition-base);
}

.pill:hover {
    transform: translateY(-2px);
    border-color: var(--color-primary-light);
    box-shadow: var(--shadow-md);
}

.pill:hover::before {
    opacity: 0.1;
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: var(--space-lg);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
    color: var(--color-gray-500);
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(10px); }
}

.scroll-text {
    font-size: var(--fs-small);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.scroll-arrow {
    stroke: currentColor;
    fill: none;
}

/* ===================================
   Sections
   =================================== */

.section {
    padding: var(--space-3xl) 0;
}

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

.section-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.section-title {
    margin-bottom: var(--space-md);
}

.title-accent {
    display: block;
    font-size: var(--fs-h3);
    font-weight: 400;
    color: var(--color-accent-dark);
    font-family: var(--font-body);
    margin-bottom: var(--space-xs);
}

.title-main {
    display: block;
    font-size: var(--fs-h1);
}

.section-description {
    font-size: 1.125rem;
    color: var(--color-gray-700);
    max-width: 600px;
    margin: 0 auto;
}

/* Languages Grid - Optimized for 10 languages */
.languages-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

/* Optimal grid layouts for different screen sizes */
@media (max-width: 767px) {
    .languages-grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }
}

@media (min-width: 768px) and (max-width: 1023px) {
    .languages-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Keep 3 columns for all desktop sizes */
@media (min-width: 1024px) {
    .languages-grid {
        grid-template-columns: repeat(3, 1fr);
        max-width: 1100px;
    }
}

/* For very large screens, still keep 3 columns for better readability */
@media (min-width: 1440px) {
    .languages-grid {
        grid-template-columns: repeat(3, 1fr);
        max-width: 1200px;
        gap: calc(var(--space-xl) * 1.2);
    }
}

.language-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.language-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

.language-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.language-card:hover::before {
    transform: scaleX(1);
}

.language-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.language-flag {
    font-size: 2.5rem;
}

.language-info h3 {
    font-size: var(--fs-h3);
    margin-bottom: var(--space-xs);
}

.language-native {
    color: var(--color-gray-500);
    font-size: var(--fs-small);
}

.language-stats {
    display: flex;
    gap: var(--space-lg);
    margin-bottom: var(--space-md);
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-weight: 600;
    color: var(--color-dark);
}

.stat-label {
    font-size: var(--fs-small);
    color: var(--color-gray-500);
}

.language-description {
    color: var(--color-gray-700);
    line-height: 1.6;
    margin-bottom: var(--space-md);
}

.language-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    font-weight: 500;
    color: var(--color-primary);
}

.language-link:hover {
    gap: var(--space-sm);
}

/* Resource Categories */
.resources-section {
    background: linear-gradient(180deg, var(--color-off-white) 0%, var(--color-white) 100%);
}

.resource-categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-lg);
}

.resource-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    position: relative;
    border: 2px solid transparent;
}

.resource-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary-light);
}

.resource-icon {
    font-size: 3rem;
    margin-bottom: var(--space-md);
    display: inline-block;
    animation: float 3s ease-in-out infinite;
    animation-delay: calc(var(--i, 0) * 0.2s);
}

.resource-title {
    font-size: var(--fs-h3);
    margin-bottom: var(--space-sm);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.resource-count {
    font-size: 0.75rem;
    background: var(--color-primary);
    color: white;
    padding: 2px 8px;
    border-radius: 12px;
    font-weight: 500;
    margin-left: auto;
    white-space: nowrap;
}

.resource-description {
    color: var(--color-gray-700);
    line-height: 1.6;
    margin-bottom: var(--space-md);
}

.resource-link {
    display: inline-flex;
    align-items: center;
    font-weight: 500;
    color: var(--color-primary);
    transition: all var(--transition-base);
}

.resource-link:hover {
    transform: translateX(4px);
    color: var(--color-primary-dark);
}

/* Methodology Section */
.methodology-section {
    background: var(--color-off-white);
}

.methods-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-lg);
}

.method-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    position: relative;
    transition: all var(--transition-base);
}

.method-card:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-md);
}

.method-card.featured {
    grid-column: 1 / -1;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-secondary-light));
    color: var(--color-white);
}

.method-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-accent);
    margin-bottom: var(--space-sm);
}

.method-card.featured .method-number {
    color: var(--color-white);
}

.method-title {
    font-size: var(--fs-h3);
    margin-bottom: var(--space-sm);
}

.method-card.featured .method-title {
    color: var(--color-white);
}

.method-description {
    color: var(--color-gray-700);
    line-height: 1.6;
}

.method-card.featured .method-description {
    color: rgba(255, 255, 255, 0.9);
}

/* Quote Section */
.quote-section {
    padding: var(--space-3xl) 0;
    background: linear-gradient(135deg,
        rgba(91, 78, 140, 0.03) 0%,
        rgba(74, 139, 140, 0.03) 100%);
}

.featured-quote {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.quote-text {
    font-size: var(--fs-h2);
    font-family: var(--font-display);
    font-style: italic;
    color: var(--color-dark);
    margin-bottom: var(--space-md);
    line-height: 1.4;
}

.quote-author {
    font-size: 1.125rem;
    color: var(--color-gray-700);
    font-style: normal;
}

/* Footer */
.footer {
    background: var(--color-dark);
    color: var(--color-gray-300);
    padding: var(--space-3xl) 0 var(--space-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

.footer-title {
    color: var(--color-white);
    font-size: var(--fs-h3);
    margin-bottom: var(--space-md);
}

.footer-text {
    line-height: 1.7;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--space-xs);
}

.footer-links a {
    color: var(--color-gray-300);
    transition: color var(--transition-base);
}

.footer-links a:hover {
    color: var(--color-white);
}

.footer-link-inline {
    color: var(--color-accent);
    text-decoration: underline;
}

.footer-link-inline:hover {
    color: var(--color-accent-light);
}

.footer-bottom {
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-dark-soft);
    text-align: center;
}

.footer-copyright {
    font-size: var(--fs-small);
    color: var(--color-gray-500);
}

/* ===================================
   Utility Classes
   =================================== */

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: all var(--transition-base);
    cursor: pointer;
    border: 2px solid transparent;
    text-decoration: none;
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-white);
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-secondary:hover {
    background: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-2px);
}

.section-cta {
    text-align: center;
    margin-top: var(--space-xl);
}

.coming-soon-notice {
    color: var(--color-gray-700);
    font-style: italic;
    padding: var(--space-lg);
    background: var(--color-gray-100);
    border-radius: var(--radius-lg);
    max-width: 600px;
    margin: 0 auto;
}

/* ===================================
   Responsive Design
   =================================== */

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-white);
        flex-direction: column;
        padding: var(--space-lg);
        gap: var(--space-md);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .hero {
        min-height: 80vh;
    }

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

    .resource-categories {
        grid-template-columns: 1fr;
    }

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

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

/* ===================================
   Animations & Interactions
   =================================== */

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

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

.slide-in-left {
    animation: slideInLeft 0.6s ease-out;
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.slide-in-right {
    animation: slideInRight 0.6s ease-out;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Loading States */
.skeleton {
    background: linear-gradient(
        90deg,
        var(--color-gray-100) 25%,
        var(--color-gray-300) 50%,
        var(--color-gray-100) 75%
    );
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* Accessibility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Focus Styles */
*:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    .nav,
    .hero-background,
    .scroll-indicator,
    .search-button,
    .footer {
        display: none;
    }

    body {
        color: black;
        background: white;
    }

    a {
        color: black;
        text-decoration: underline;
    }
}