/* =============================================================================
   DragonBytes AI - Main Stylesheet
   Theme: Vibrant Pink & Gold
   ============================================================================= */

/* -----------------------------------------------------------------------------
   CSS Variables & Theme
   ----------------------------------------------------------------------------- */
:root {
    /* Backgrounds - Light and warm */
    --bg-primary: #fef7f7;
    --bg-secondary: #fff5f5;
    --bg-card: #ffffff;
    --bg-card-hover: #fffafa;
    
    /* Accent Colors - Pink & Gold */
    --accent-primary: #e91e8c;
    --accent-secondary: #ff6bb3;
    --accent-tertiary: #d4a039;
    --accent-gold: #f4b942;
    --accent-gold-dark: #c9952d;
    
    /* Gradients */
    --accent-gradient: linear-gradient(135deg, #e91e8c 0%, #ff6bb3 50%, #f4b942 100%);
    --accent-gradient-soft: linear-gradient(135deg, rgba(233, 30, 140, 0.1) 0%, rgba(244, 185, 66, 0.1) 100%);
    --bg-gradient: linear-gradient(135deg, #fef7f7 0%, #fff0f5 50%, #fffbeb 100%);
    
    /* Text Colors */
    --text-primary: #2d2235;
    --text-secondary: #5c4d6b;
    --text-muted: #8b7a99;
    
    /* Borders & Accents */
    --border-color: #f3d4e0;
    --border-color-strong: #e9b8cc;
    
    /* Status Colors */
    --success: #10b981;
    --error: #ef4444;
    
    /* Typography */
    --font-display: 'Fraunces', Georgia, serif;
    --font-body: 'Outfit', -apple-system, sans-serif;
    
    /* Effects */
    --shadow-soft: 0 4px 20px rgba(233, 30, 140, 0.1);
    --shadow-glow: 0 0 40px rgba(233, 30, 140, 0.15);
    --shadow-gold: 0 4px 20px rgba(244, 185, 66, 0.2);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background: var(--bg-gradient);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* -----------------------------------------------------------------------------
   Background Effects
   ----------------------------------------------------------------------------- */
.bg-effects {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.bg-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.5;
    animation: float 20s ease-in-out infinite;
}

.bg-orb-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(233, 30, 140, 0.2) 0%, transparent 70%);
    top: -200px;
    right: -200px;
    animation-delay: 0s;
}

.bg-orb-2 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(244, 185, 66, 0.25) 0%, transparent 70%);
    bottom: -150px;
    left: -150px;
    animation-delay: -7s;
}

.bg-orb-3 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(255, 107, 179, 0.2) 0%, transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -14s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -30px) scale(1.05); }
    66% { transform: translate(-20px, 20px) scale(0.95); }
}

.grid-pattern {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(233, 30, 140, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(233, 30, 140, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
    z-index: 0;
}

/* -----------------------------------------------------------------------------
   Layout
   ----------------------------------------------------------------------------- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
    z-index: 1;
}

/* -----------------------------------------------------------------------------
   Header
   ----------------------------------------------------------------------------- */
.header {
    padding: 24px 0;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    background: rgba(254, 247, 247, 0.9);
    backdrop-filter: blur(20px);
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-link {
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-img {
    height: 55px;
    width: auto;
}

.logo-text-container {
    display: flex;
    flex-direction: column;
}

.logo-text {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-icon {
    width: 48px;
    height: 48px;
    background: var(--accent-gradient);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    box-shadow: var(--shadow-soft);
}

.logo-text {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.header-cta {
    display: flex;
    gap: 12px;
}

/* -----------------------------------------------------------------------------
   Buttons
   ----------------------------------------------------------------------------- */
.btn {
    padding: 12px 24px;
    border-radius: 10px;
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: var(--shadow-soft);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(233, 30, 140, 0.3);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-secondary);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    padding: 8px 16px;
}

.btn-ghost:hover {
    color: var(--accent-primary);
    background: rgba(233, 30, 140, 0.05);
}

/* -----------------------------------------------------------------------------
   Hero Section
   ----------------------------------------------------------------------------- */
.hero {
    padding: 80px 0 60px;
    text-align: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: linear-gradient(135deg, rgba(244, 185, 66, 0.15) 0%, rgba(233, 30, 140, 0.15) 100%);
    border: 1px solid rgba(244, 185, 66, 0.3);
    border-radius: 50px;
    font-size: 0.85rem;
    color: var(--accent-gold-dark);
    margin-bottom: 24px;
    animation: fadeInDown 0.6s ease-out;
    text-decoration: none;
    transition: all 0.3s ease;
}

.hero-badge:hover {
    background: linear-gradient(135deg, rgba(244, 185, 66, 0.25) 0%, rgba(233, 30, 140, 0.25) 100%);
    border-color: rgba(244, 185, 66, 0.5);
    transform: translateY(-2px);
}

.hero h1 {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 20px;
    color: var(--text-primary);
    animation: fadeInUp 0.6s ease-out 0.1s backwards;
}

.hero h1 .gradient-text,
.gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 40px;
    animation: fadeInUp 0.6s ease-out 0.2s backwards;
}

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

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

/* -----------------------------------------------------------------------------
   Navigation Tabs
   ----------------------------------------------------------------------------- */
.nav-tabs {
    display: flex;
    justify-content: center;
    gap: 8px;
    padding: 8px;
    background: var(--bg-card);
    border-radius: 16px;
    margin-bottom: 48px;
    flex-wrap: wrap;
    animation: fadeInUp 0.6s ease-out 0.3s backwards;
    box-shadow: var(--shadow-soft);
    border: 1px solid var(--border-color);
}

.nav-tab {
    padding: 14px 28px;
    border-radius: 12px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    border: none;
    background: transparent;
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-tab:hover {
    color: var(--accent-primary);
    background: rgba(233, 30, 140, 0.05);
}

.nav-tab.active {
    background: var(--accent-gradient);
    color: white;
    box-shadow: var(--shadow-soft);
}

.nav-tab-icon {
    font-size: 1.1rem;
}

/* -----------------------------------------------------------------------------
   Tab Content
   ----------------------------------------------------------------------------- */
.tab-content {
    display: none;
    animation: fadeIn 0.4s ease-out;
}

.tab-content.active {
    display: block;
}

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

/* -----------------------------------------------------------------------------
   Weekly Highlights
   ----------------------------------------------------------------------------- */
.highlights-section {
    margin-top: 60px;
    margin-bottom: 60px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
    flex-wrap: wrap;
    gap: 16px;
}

.section-title {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 600;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-title .icon {
    margin-right: 12px;
    -webkit-text-fill-color: initial;
}

.premium-badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    background: linear-gradient(135deg, rgba(244, 185, 66, 0.2) 0%, rgba(233, 30, 140, 0.2) 100%);
    border: 1px solid var(--accent-gold);
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--accent-gold-dark);
    -webkit-text-fill-color: var(--accent-gold-dark);
    margin-left: 12px;
    vertical-align: middle;
}

.premium-badge-small {
    display: inline-flex;
    align-items: center;
    padding: 1px 6px;
    background: linear-gradient(135deg, rgba(244, 185, 66, 0.2) 0%, rgba(233, 30, 140, 0.2) 100%);
    border: 1px solid var(--accent-gold);
    border-radius: 10px;
    font-size: 0.55rem;
    font-weight: 600;
    color: var(--accent-gold-dark);
    margin-left: 4px;
    vertical-align: middle;
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-top: 4px;
}

.highlights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 24px;
}

.highlight-card {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 28px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
}

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

.highlight-card:hover {
    border-color: var(--accent-secondary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

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

.highlight-category {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: linear-gradient(135deg, rgba(244, 185, 66, 0.15) 0%, rgba(233, 30, 140, 0.15) 100%);
    color: var(--accent-gold-dark);
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 500;
    margin-bottom: 16px;
}

.highlight-title {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 8px;
    line-height: 1.4;
    color: var(--text-primary);
}

.highlight-original-title {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 12px;
    font-style: italic;
    padding: 6px 10px;
    background: var(--bg-secondary);
    border-radius: 4px;
    border-left: 2px solid var(--accent-gold);
}

.highlight-summary {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 20px;
}

.highlight-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

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

.highlight-link {
    color: var(--accent-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 4px;
    transition: var(--transition);
}

.highlight-link:hover {
    color: var(--accent-gold-dark);
}

.highlights-search {
    margin-top: 32px;
    padding: 24px;
    background: var(--bg-card);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    text-align: center;
}

.highlights-search p {
    color: var(--text-secondary);
    margin-bottom: 12px;
    font-size: 0.95rem;
}

.highlights-search-box {
    display: flex;
    gap: 10px;
    max-width: 500px;
    margin: 0 auto;
}

.highlights-search-box input {
    flex: 1;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.95rem;
    transition: var(--transition);
}

.highlights-search-box input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.highlights-search-box input::placeholder {
    color: var(--text-muted);
}

.highlights-search-box button {
    padding: 12px 20px;
    background: var(--accent-gradient);
    color: white;
    border: none;
    border-radius: 10px;
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.highlights-search-box button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-soft);
}

/* -----------------------------------------------------------------------------
   Search Section
   ----------------------------------------------------------------------------- */
.search-section {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 40px;
    border: 1px solid var(--border-color);
    margin-bottom: 40px;
    box-shadow: var(--shadow-soft);
}

.search-box {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.search-input-wrapper {
    flex: 1;
    min-width: 280px;
    position: relative;
}

.search-input-wrapper::before {
    content: '🔍';
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.1rem;
    opacity: 0.5;
}

#query {
    width: 100%;
    padding: 18px 20px 18px 52px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 14px;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: var(--font-body);
    transition: var(--transition);
}

#query::placeholder {
    color: var(--text-muted);
}

#query:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 4px rgba(233, 30, 140, 0.1);
}

#searchBtn {
    padding: 18px 36px;
    background: var(--accent-gradient);
    color: white;
    border: none;
    border-radius: 14px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

#searchBtn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(233, 30, 140, 0.3);
}

.search-options {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
    align-items: center;
}

.search-options label {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    cursor: pointer;
}

.search-options select {
    padding: 10px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.9rem;
    cursor: pointer;
}

.search-options input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--accent-primary);
}

.sample-queries {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 20px;
}

.sample-query {
    padding: 8px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    border-radius: 20px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition);
}

.sample-query:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    background: rgba(233, 30, 140, 0.05);
}

/* -----------------------------------------------------------------------------
   Search Results
   ----------------------------------------------------------------------------- */
.results-container {
    display: grid;
    gap: 20px;
}

.stats-bar {
    background: linear-gradient(135deg, rgba(233, 30, 140, 0.08) 0%, rgba(244, 185, 66, 0.08) 100%);
    border: 1px solid var(--border-color);
    padding: 16px 24px;
    border-radius: 12px;
    margin-bottom: 24px;
    color: var(--text-secondary);
}

.stats-bar strong {
    color: var(--accent-primary);
}

.paper {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 28px;
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--accent-primary);
    transition: var(--transition);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
}

.paper:hover {
    border-color: var(--accent-primary);
    transform: translateX(4px);
    box-shadow: var(--shadow-soft);
}

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

.paper-title {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
}

.paper-rank {
    background: var(--accent-gradient);
    color: white;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    white-space: nowrap;
}

.paper-meta {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    margin-bottom: 16px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.meta-item strong {
    color: var(--text-secondary);
}

.paper-summary {
    background: var(--bg-secondary);
    padding: 16px;
    border-radius: 10px;
    margin-bottom: 16px;
    border-left: 3px solid var(--accent-gold);
}

.paper-summary h4 {
    color: var(--text-secondary);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
    font-weight: 600;
}

.summary-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.paper-actions {
    display: flex;
    gap: 12px;
    align-items: center;
    flex-wrap: wrap;
}

.action-btn {
    padding: 10px 18px;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.pdf-btn {
    background: #dc2626;
    color: white;
}

.pdf-btn:hover {
    background: #b91c1c;
}

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

.arxiv-btn:hover {
    background: #059669;
}

.score-badge, .citation-badge {
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.score-badge {
    background: rgba(233, 30, 140, 0.15);
    color: var(--accent-primary);
}

.citation-badge {
    background: rgba(244, 185, 66, 0.2);
    color: var(--accent-gold-dark);
}

/* -----------------------------------------------------------------------------
   Loading & Empty States
   ----------------------------------------------------------------------------- */
.loading, .no-results, .ready-state {
    text-align: center;
    padding: 60px 40px;
    background: var(--bg-card);
    border-radius: 16px;
    border: 1px solid var(--border-color);
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

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

.ready-state h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.ready-state p {
    color: var(--text-secondary);
    margin-bottom: 24px;
}

/* -----------------------------------------------------------------------------
   Subscribe Section
   ----------------------------------------------------------------------------- */
.subscribe-section {
    max-width: 600px;
    margin: 0 auto;
}

.subscribe-card {
    background: var(--bg-card);
    border-radius: 24px;
    padding: 32px;
    border: 1px solid var(--border-color);
    text-align: center;
    box-shadow: var(--shadow-soft);
}

.subscribe-icon {
    width: 60px;
    height: 60px;
    background: var(--accent-gradient);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    margin: 0 auto 16px;
    box-shadow: var(--shadow-soft);
}

.subscribe-card h2 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.subscribe-card > p {
    color: var(--text-secondary);
    margin-bottom: 24px;
    font-size: 0.95rem;
}

.subscribe-form {
    text-align: left;
}

.form-group {
    margin-bottom: 18px;
}

.form-label {
    display: block;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 8px;
}

.form-input {
    width: 100%;
    padding: 12px 14px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.95rem;
    transition: var(--transition);
}

.form-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 4px rgba(233, 30, 140, 0.1);
}

.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: 8px;
}

.topic-chip {
    padding: 10px 12px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.topic-chip:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.topic-chip.selected {
    background: linear-gradient(135deg, rgba(233, 30, 140, 0.1) 0%, rgba(244, 185, 66, 0.1) 100%);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.topic-input {
    min-width: 120px;
    outline: none;
    font-family: var(--font-body);
    border-style: dashed !important;
}

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

.topic-input:focus {
    border-color: var(--accent-primary) !important;
    border-style: solid !important;
    background: rgba(233, 30, 140, 0.05);
}

.custom-topics-container {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 12px;
}

.custom-topic-chip {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    background: linear-gradient(135deg, rgba(233, 30, 140, 0.15) 0%, rgba(244, 185, 66, 0.15) 100%);
    border: 2px solid var(--accent-primary);
    border-radius: 10px;
    font-size: 0.85rem;
    color: var(--accent-primary);
}

.custom-topic-chip .remove-topic {
    cursor: pointer;
    font-size: 1rem;
    opacity: 0.7;
    transition: var(--transition);
}

.custom-topic-chip .remove-topic:hover {
    opacity: 1;
}

.frequency-options {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}

.frequency-option {
    padding: 12px 8px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.frequency-option .freq-label {
    font-weight: 600;
    margin-bottom: 2px;
    color: var(--text-primary);
    font-size: 0.85rem;
}

.frequency-option .freq-desc {
    font-size: 0.7rem;
    color: var(--text-muted);
}

.frequency-option:hover {
    border-color: var(--accent-primary);
}

.frequency-option.selected {
    background: linear-gradient(135deg, rgba(233, 30, 140, 0.1) 0%, rgba(244, 185, 66, 0.1) 100%);
    border-color: var(--accent-primary);
}

.frequency-option .freq-label {
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--text-primary);
}

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

.subscribe-btn {
    width: 100%;
    padding: 14px;
    background: var(--accent-gradient);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 24px;
}

.subscribe-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(233, 30, 140, 0.3);
}

/* Success Message */
.success-message {
    display: none;
    text-align: center;
    padding: 48px;
}

.success-message.show {
    display: block;
    animation: fadeIn 0.5s ease-out;
}

.success-icon {
    width: 80px;
    height: 80px;
    background: var(--success);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
    margin: 0 auto 24px;
    color: white;
}

.success-message h3 {
    font-family: var(--font-display);
    font-size: 1.75rem;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.success-message p {
    color: var(--text-secondary);
}

/* -----------------------------------------------------------------------------
   Learning Section
   ----------------------------------------------------------------------------- */
.learning-section {
    padding: 40px 0;
}

.learning-section .section-header {
    margin-bottom: 40px;
}

.learning-hero {
    max-width: 700px;
    margin: 0 auto 60px;
    text-align: center;
}

.learning-hero h2 {
    font-family: var(--font-display);
    font-size: 2.25rem;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.learning-hero p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    line-height: 1.7;
}

.learning-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-bottom: 48px;
}

.feature-card {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 36px;
    border: 1px solid var(--border-color);
    text-align: left;
    transition: var(--transition);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
}

.feature-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: var(--accent-gradient);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.learning-cta {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 48px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-soft);
    text-align: center;
}

.learning-cta h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.learning-cta p {
    color: var(--text-secondary);
    margin-bottom: 24px;
}

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

/* -----------------------------------------------------------------------------
   AI Learning Preview (Coming Soon) Section
   ----------------------------------------------------------------------------- */
.learning-preview-section {
    margin-top: 60px;
    margin-bottom: 60px;
}

.learning-preview-card {
    background: var(--bg-card);
    border-radius: 24px;
    padding: 48px;
    border: 1px solid var(--border-color);
    text-align: center;
    box-shadow: var(--shadow-soft);
    position: relative;
    overflow: hidden;
}

.learning-preview-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--accent-gradient);
}

.coming-soon-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: linear-gradient(135deg, rgba(244, 185, 66, 0.2) 0%, rgba(233, 30, 140, 0.2) 100%);
    border: 1px solid var(--accent-gold);
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent-gold-dark);
    margin-bottom: 24px;
}

.learning-preview-card h2 {
    font-family: var(--font-display);
    font-size: 2rem;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.learning-preview-desc {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto 32px;
    line-height: 1.7;
}

.learning-preview-features {
    display: flex;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
    margin-bottom: 32px;
}

.preview-feature {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    background: var(--bg-secondary);
    border-radius: 10px;
    border: 1px solid var(--border-color);
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.preview-feature-icon {
    font-size: 1.2rem;
}

.learning-preview-cta {
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

.learning-preview-cta p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.subscribe-note {
    text-align: center;
    color: var(--accent-gold-dark);
    font-size: 0.9rem;
    margin-top: 16px;
    font-weight: 500;
}

/* -----------------------------------------------------------------------------
   Footer
   ----------------------------------------------------------------------------- */
.footer {
    padding: 40px 0;
    border-top: 1px solid var(--border-color);
    margin-top: 80px;
    text-align: center;
    color: var(--text-muted);
}

.footer-links {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 24px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

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

.share-divider {
    color: var(--text-muted);
    opacity: 0.5;
}

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

.footer-links a[title*="Share"] {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--bg-secondary);
    border-radius: 50%;
    font-size: 0.85rem;
    font-weight: 600;
}

.footer-links a[title*="Share"]:hover {
    background: var(--accent-gradient);
    color: white;
    transform: scale(1.1);
}

/* -----------------------------------------------------------------------------
   Articles Page
   ----------------------------------------------------------------------------- */
.page-header {
    text-align: center;
    padding: 60px 0 40px;
}

.page-header h1 {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3rem);
    margin-bottom: 16px;
}

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

.articles-filter {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin-bottom: 40px;
}

.filter-chip {
    padding: 10px 20px;
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: 25px;
    color: var(--text-secondary);
    font-family: var(--font-body);
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
}

.filter-chip:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.filter-chip.active {
    background: var(--accent-gradient);
    border-color: transparent;
    color: white;
}

.articles-section {
    margin-bottom: 40px;
}

.articles-grid {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.week-divider {
    display: flex;
    align-items: center;
    gap: 16px;
    margin: 20px 0;
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
}

.week-divider::before,
.week-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-color);
}

.week-divider span {
    white-space: nowrap;
}

.article-card {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 32px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.article-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.article-category {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    background: linear-gradient(135deg, rgba(244, 185, 66, 0.15) 0%, rgba(233, 30, 140, 0.15) 100%);
    color: var(--accent-gold-dark);
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 16px;
}

.article-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 8px;
    line-height: 1.3;
    color: var(--text-primary);
}

.article-original-title {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 16px;
    font-style: italic;
    padding: 8px 12px;
    background: var(--bg-secondary);
    border-radius: 6px;
    border-left: 3px solid var(--accent-gold);
}

.article-summary {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.7;
    margin-bottom: 20px;
}

.article-meta {
    display: flex;
    gap: 20px;
    margin-bottom: 16px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tag {
    padding: 4px 12px;
    background: var(--bg-secondary);
    border-radius: 15px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.article-links {
    display: flex;
    gap: 12px;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.article-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    transition: var(--transition);
}

.article-link:hover {
    background: var(--accent-gradient);
    border-color: transparent;
    color: white;
    transform: translateY(-2px);
}

.article-link-pdf {
    background: linear-gradient(135deg, rgba(244, 185, 66, 0.1) 0%, rgba(233, 30, 140, 0.1) 100%);
    border-color: var(--accent-gold);
    color: var(--accent-gold-dark);
}

.article-link-pdf:hover {
    background: var(--accent-gradient);
    color: white;
}

.load-more {
    text-align: center;
    margin: 40px 0;
}

.subscribe-cta {
    margin: 60px 0;
}

.subscribe-cta-card {
    background: var(--accent-gradient);
    border-radius: 24px;
    padding: 48px;
    text-align: center;
    color: white;
}

.subscribe-cta-card h2 {
    font-family: var(--font-display);
    font-size: 1.75rem;
    margin-bottom: 12px;
}

.subscribe-cta-card p {
    opacity: 0.9;
    margin-bottom: 24px;
}

.subscribe-cta-card .btn-primary {
    background: white;
    color: var(--accent-primary);
}

.subscribe-cta-card .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
}

/* Make logo clickable */
a.logo {
    text-decoration: none;
    color: inherit;
}

/* -----------------------------------------------------------------------------
   Responsive Design
   ----------------------------------------------------------------------------- */
@media (max-width: 768px) {
    .header-content {
        justify-content: center;
        text-align: center;
    }
    
    .logo-text-container {
        display: none;
    }
    
    .logo-img {
        height: 50px;
    }
    
    .hero {
        padding: 50px 0 40px;
    }
    
    .nav-tabs {
        padding: 6px;
    }
    
    .nav-tab {
        padding: 12px 16px;
        font-size: 0.85rem;
    }
    
    .nav-tab-text {
        display: none;
    }
    
    .nav-tab-icon {
        font-size: 1.3rem;
    }
    
    .search-section {
        padding: 24px;
    }
    
    .subscribe-card {
        padding: 24px 20px;
    }
    
    .highlights-grid {
        grid-template-columns: 1fr;
    }
    
    .frequency-options {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* =============================================================================
   Premium Section Styles (Compact)
   ============================================================================= */

/* Announcement Banner */
.announcement-banner {
    background: var(--accent-gradient);
    color: white;
    padding: 0.6rem 0;
    text-align: center;
    font-size: 0.9rem;
}

.announcement-banner a {
    color: white;
    text-decoration: none;
    transition: opacity 0.2s;
}

.announcement-banner a:hover {
    opacity: 0.9;
}

.announcement-banner strong {
    font-weight: 600;
}

.premium-compact {
    background: linear-gradient(135deg, #fdf2f8 0%, #fef3c7 100%);
    padding: 2rem 0;
    border-top: 2px solid var(--accent-primary);
}

.premium-compact-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
    flex-wrap: wrap;
}

.premium-compact-text h3 {
    margin: 0 0 0.25rem;
    font-size: 1.25rem;
    color: var(--text-primary);
}

.premium-compact-text p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.premium-compact-form {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.premium-compact-form input {
    padding: 0.625rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.95rem;
    min-width: 200px;
    transition: var(--transition);
}

.premium-compact-form input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.premium-compact-form button {
    padding: 0.625rem 1.25rem;
    white-space: nowrap;
}

.premium-compact-note {
    margin: 1rem 0 0;
    color: var(--text-secondary);
    font-size: 0.85rem;
    text-align: center;
}

.premium-compact-note strong {
    color: var(--accent-primary);
}

.premium-compact-success {
    background: white;
    color: var(--success);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    margin-top: 1rem;
    text-align: center;
    font-weight: 500;
}

@media (max-width: 600px) {
    .premium-compact-content {
        flex-direction: column;
        text-align: center;
    }
    
    .premium-compact-form {
        width: 100%;
        flex-direction: column;
    }
    
    .premium-compact-form input {
        width: 100%;
    }
    
    .premium-compact-form button {
        width: 100%;
    }
}