/* ==========================================================================
   DNP Project - Patient Education Portal CSS Style Sheet
   ========================================================================== */

/* 1. Global Reset & Variables */
:root {
    --primary: #0f172a;       /* Deep Slate Blue */
    --primary-light: #1e293b;
    --primary-muted: #334155;
    
    --accent: #0d9488;        /* Teal */
    --accent-hover: #0f766e;
    --accent-light: #f0fdfa;  /* Very Light Teal background */
    --accent-glow: rgba(13, 148, 136, 0.15);
    
    --bg-main: #f8fafc;       /* Light cool gray */
    --bg-card: #ffffff;
    --border-color: #e2e8f0;
    
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.03);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.06), 0 4px 6px -2px rgba(15, 23, 42, 0.03);
    --shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.08), 0 10px 10px -5px rgba(15, 23, 42, 0.04);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    --font-sans: 'Plus Jakarta Sans', sans-serif;
    --font-serif: 'Playfair Display', serif;
    
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

/* 2. Reusable Layout Components */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

section {
    padding: 100px 0;
    position: relative;
}

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

.section-header {
    max-width: 650px;
    margin: 0 auto 60px auto;
}

.section-title {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: -0.02em;
    margin-bottom: 12px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background-color: var(--accent-light);
    color: var(--accent);
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: 100px;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    font-family: var(--font-sans);
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: var(--transition-fast);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background-color: var(--accent);
    color: white;
    box-shadow: 0 4px 14px var(--accent-glow);
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(13, 148, 136, 0.25);
}

.btn-secondary {
    background-color: white;
    color: var(--primary);
    border: 1px solid var(--border-color);
}

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

/* 3. Header & Navigation */
.site-header {
    position: sticky;
    top: 0;
    background-color: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    padding: 16px 0;
    transition: var(--transition-fast);
}

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

.logo-group {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--primary);
    gap: 12px;
}

.logo-icon {
    width: 42px;
    height: 42px;
    color: var(--accent);
    background-color: var(--accent-light);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8px;
}

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

.logo-name {
    font-size: 1.15rem;
    font-weight: 800;
    letter-spacing: -0.01em;
    line-height: 1.2;
}

.logo-subtitle {
    font-size: 0.72rem;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 550;
    transition: var(--transition-fast);
}

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

.cta-button {
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
    color: white;
    background-color: var(--primary);
    padding: 10px 20px;
    border-radius: 8px;
    transition: var(--transition-fast);
}

.cta-button:hover {
    background-color: var(--accent);
    box-shadow: 0 4px 12px var(--accent-glow);
}

/* 4. Hero Section */
.section-hero {
    overflow: hidden;
    padding: 120px 0 100px 0;
}

.hero-bg-glow {
    position: absolute;
    top: -10%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(13, 148, 136, 0.08) 0%, rgba(255,255,255,0) 70%);
    z-index: 1;
    pointer-events: none;
}

.hero-container {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 2;
}

.hero-content {
    max-width: 640px;
}

.hero-tag {
    display: inline-block;
    padding: 6px 14px;
    background-color: var(--accent-light);
    color: var(--accent);
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: 100px;
    margin-bottom: 20px;
}

.hero-title {
    font-size: 3.25rem;
    line-height: 1.15;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: -0.03em;
    margin-bottom: 24px;
}

.hero-lead {
    font-size: 1.15rem;
    color: var(--text-secondary);
    line-height: 1.65;
    margin-bottom: 36px;
}

.hero-actions {
    display: flex;
    gap: 16px;
}

/* Hero Badge Card */
.hero-badge-card {
    background: linear-gradient(135deg, rgba(255,255,255,0.7) 0%, rgba(255,255,255,0.3) 100%);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-xl);
    padding: 32px;
    box-shadow: var(--shadow-xl);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transition: var(--transition-normal);
}

.hero-badge-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 30px 40px -10px rgba(15, 23, 42, 0.12);
}

.avatar-container {
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
}

.avatar-placeholder {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent) 0%, var(--primary) 100%);
    color: white;
    font-family: var(--font-serif);
    font-size: 2.25rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 10px rgba(13, 148, 136, 0.3);
}

.avatar-img {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid white;
    box-shadow: 0 4px 10px rgba(13, 148, 136, 0.3);
    transition: var(--transition-normal);
}

.avatar-img:hover {
    transform: scale(1.05);
}

.hero-badge-card .card-title {
    text-align: center;
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--primary);
}

.hero-badge-card .card-desc {
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.card-metrics {
    display: flex;
    align-items: center;
    justify-content: space-around;
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
}

.metric {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.metric-val {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--accent);
    line-height: 1.2;
}

.metric-lbl {
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-top: 2px;
}

.metric-divider {
    width: 1px;
    height: 36px;
    background-color: var(--border-color);
}

/* 5. Video Section */
.section-videos {
    background-color: #f1f5f9;
}

.video-grid {
    display: grid;
    grid-template-columns: 1.3fr 0.7fr;
    gap: 32px;
    align-items: start;
}

.video-player-container {
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.video-aspect-ratio {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 ratio */
    height: 0;
    background-color: black;
}

.video-aspect-ratio iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.player-info {
    padding: 24px;
}

.player-title {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
}

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

/* Playlist Column */
.video-playlist {
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    max-height: 575px;
    display: flex;
    flex-direction: column;
}

.playlist-header {
    padding: 20px 24px;
    font-size: 1.05rem;
    font-weight: 700;
    border-bottom: 1px solid var(--border-color);
    color: var(--primary);
}

.playlist-items {
    overflow-y: auto;
    flex: 1;
}

.playlist-card {
    display: flex;
    gap: 16px;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: var(--transition-fast);
}

.playlist-card:last-child {
    border-bottom: none;
}

.playlist-card:hover {
    background-color: var(--bg-main);
}

.playlist-card.active {
    background-color: var(--accent-light);
    border-left: 4px solid var(--accent);
}

.playlist-thumb {
    width: 90px;
    height: 60px;
    position: relative;
    border-radius: 6px;
    overflow: hidden;
    flex-shrink: 0;
    background-color: #000;
}

.playlist-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.85;
    transition: var(--transition-fast);
}

.playlist-card:hover .playlist-thumb img {
    opacity: 1;
}

.video-duration {
    position: absolute;
    bottom: 4px;
    right: 4px;
    background-color: rgba(15, 23, 42, 0.85);
    color: white;
    font-size: 0.65rem;
    font-weight: 700;
    padding: 2px 6px;
    border-radius: 4px;
}

.playlist-details {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.playlist-tag {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent);
    margin-bottom: 4px;
}

.playlist-card.active .playlist-tag {
    color: var(--accent-hover);
}

.playlist-card-title {
    font-size: 0.88rem;
    font-weight: 600;
    line-height: 1.35;
    color: var(--primary);
    /* Multi-line clamp: max 2 lines */
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* 6. Calculator Section */
.section-calculator {
    background-color: var(--bg-main);
}

.dual-calculators-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    align-items: stretch;
}

.dual-calculators-grid .calculator-card {
    padding: 28px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    background-color: var(--bg-card);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-color);
}

.compact-calc-header {
    margin-bottom: 16px;
}

.calc-title-sm {
    font-size: 1.35rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--primary);
    margin-bottom: 6px;
    line-height: 1.25;
}

.calc-intro-sm {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.45;
}

.form-label-sm {
    font-size: 0.8rem;
    font-weight: 700;
    margin-bottom: 6px;
    color: var(--primary);
}

.form-control-sm {
    padding: 10px 14px 10px 42px;
    font-size: 0.9rem;
    border-radius: var(--radius-sm);
}

.input-wrapper-sm .input-icon {
    width: 18px;
    height: 18px;
    left: 14px;
}

.btn-sm {
    padding: 6px 14px;
    font-size: 0.78rem;
    border-radius: 6px;
}

.outputs-list-compact {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 12px;
}

.milestone-card-sm {
    padding: 14px 16px;
    gap: 12px;
    border-radius: var(--radius-sm);
}

.milestone-icon-sm {
    width: 36px;
    height: 36px;
    border-radius: 6px;
}

.milestone-icon-sm svg {
    width: 18px;
    height: 18px;
}

.milestone-date-sm {
    font-size: 1rem;
    font-weight: 800;
    margin-bottom: 4px;
}

.milestone-desc-sm {
    font-size: 0.78rem;
    line-height: 1.35;
}

.calculator-card {
    background-color: var(--bg-card);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.calculator-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
}

/* Inputs side */
.calc-inputs-column {
    padding: 60px;
    background: linear-gradient(135deg, rgba(240, 253, 250, 0.3) 0%, rgba(255,255,255,0) 100%);
    border-right: 1px solid var(--border-color);
}

.calc-badge {
    display: inline-block;
    padding: 4px 12px;
    background-color: var(--primary-muted);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 100px;
    margin-bottom: 16px;
    text-transform: uppercase;
}

.calc-title {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--primary);
    margin-bottom: 16px;
    line-height: 1.25;
}

.calc-intro {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 36px;
    line-height: 1.6;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-label {
    font-size: 0.88rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--primary);
}

.input-wrapper {
    position: relative;
    margin-bottom: 12px;
}

.input-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    color: var(--text-muted);
    pointer-events: none;
}

.form-control {
    width: 100%;
    padding: 14px 16px 14px 48px;
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 500;
    color: var(--primary);
    background-color: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    outline: none;
    transition: var(--transition-fast);
}

.form-control:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px var(--accent-glow);
}

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

/* Outputs side */
.calc-outputs-column {
    padding: 60px;
    background-color: #fafbfc;
    display: flex;
    flex-direction: column;
}

.outputs-header h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 24px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.outputs-list {
    display: flex;
    flex-direction: column;
    gap: 24px;
    flex: 1;
    justify-content: center;
}

/* Milestone Card */
.milestone-card {
    display: flex;
    gap: 20px;
    background-color: white;
    padding: 24px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.milestone-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background-color: var(--accent);
    opacity: 0;
    transition: var(--transition-normal);
}

.milestone-card:not(.disabled):hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

.milestone-card:not(.disabled):hover::before {
    opacity: 1;
}

.milestone-card.disabled {
    opacity: 0.65;
    background-color: rgba(241, 245, 249, 0.4);
}

.milestone-icon {
    width: 48px;
    height: 48px;
    background-color: var(--bg-main);
    color: var(--text-muted);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: var(--transition-normal);
}

.milestone-card:not(.disabled) .milestone-icon {
    background-color: var(--accent-light);
    color: var(--accent);
}

.milestone-info {
    flex: 1;
}

.milestone-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 6px;
}

.milestone-label {
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.milestone-offset {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    background-color: var(--bg-main);
    padding: 2px 8px;
    border-radius: 4px;
}

.milestone-card:not(.disabled) .milestone-offset {
    color: var(--accent);
    background-color: var(--accent-light);
}

.milestone-name {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
}

.milestone-date-display {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--text-muted);
    margin-bottom: 12px;
    transition: var(--transition-normal);
}

.milestone-card:not(.disabled) .milestone-date-display {
    color: var(--accent);
    font-family: var(--font-sans);
}

.milestone-desc {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* 7. FAQ Section & Knowledge Base Layout */
.section-faq {
    background-color: white;
}

.faq-container {
    max-width: 900px;
}

/* FAQ Search Input Bar */
.faq-search-wrapper {
    margin-bottom: 24px;
}

.search-input-group {
    position: relative;
    display: flex;
    align-items: center;
}

.search-input-group .search-icon {
    position: absolute;
    left: 18px;
    width: 20px;
    height: 20px;
    color: var(--text-muted);
    pointer-events: none;
}

.search-input-group input {
    width: 100%;
    padding: 16px 48px 16px 50px;
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 500;
    color: var(--primary);
    background-color: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    outline: none;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-fast);
}

.search-input-group input:focus {
    border-color: var(--accent);
    background-color: white;
    box-shadow: 0 0 0 4px var(--accent-glow);
}

.search-clear-btn {
    position: absolute;
    right: 16px;
    background: var(--border-color);
    border: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    font-size: 1.1rem;
    line-height: 1;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
}

.search-clear-btn:hover {
    background: var(--text-muted);
    color: white;
}

/* Category Filter Pills (Wrapping Multi-Row Grid - Fully Visible) */
.faq-categories-pills {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px 10px;
    margin-bottom: 32px;
}

.category-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 14px;
    background-color: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: 100px;
    font-family: var(--font-sans);
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
}

.category-pill:hover {
    border-color: var(--accent);
    color: var(--primary);
}

.category-pill.active {
    background-color: var(--accent);
    color: white;
    border-color: var(--accent);
    box-shadow: 0 4px 12px var(--accent-glow);
}

.pill-count {
    background-color: rgba(0, 0, 0, 0.08);
    color: var(--text-muted);
    padding: 2px 8px;
    border-radius: 100px;
    font-size: 0.72rem;
    font-weight: 700;
}

.category-pill.active .pill-count {
    background-color: rgba(255, 255, 255, 0.25);
    color: white;
}

/* Category Section Dividers */
.faq-category-header {
    display: flex;
    align-items: center;
    margin-top: 36px;
    margin-bottom: 16px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--accent-light);
}

.faq-category-header h3 {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.faq-category-header .cat-icon {
    font-size: 1.3rem;
}

/* No Search Results State */
.faq-no-results {
    text-align: center;
    padding: 48px 24px;
    background-color: var(--bg-main);
    border-radius: var(--radius-lg);
    border: 1px dashed var(--border-color);
    margin-top: 24px;
}

.no-results-inner svg {
    width: 48px;
    height: 48px;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.no-results-inner h4 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 6px;
}

.no-results-inner p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.faq-accordion-group {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.faq-item {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-main);
    overflow: hidden;
    transition: var(--transition-normal);
}

.faq-item:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-sm);
}

.faq-trigger {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px;
    background: none;
    border: none;
    outline: none;
    cursor: pointer;
    text-align: left;
}

.faq-question {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--primary);
    padding-right: 20px;
    transition: var(--transition-fast);
}

.faq-trigger:hover .faq-question {
    color: var(--accent);
}

.faq-icon-wrapper {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
    flex-shrink: 0;
    transition: var(--transition-normal);
}

.faq-chevron {
    width: 16px;
    height: 16px;
    color: var(--text-secondary);
    transition: transform var(--transition-normal);
}

.faq-trigger[aria-expanded="true"] .faq-chevron {
    transform: rotate(180deg);
}

.faq-trigger[aria-expanded="true"] .faq-icon-wrapper {
    background-color: var(--accent);
    color: white;
}

.faq-trigger[aria-expanded="true"] .faq-chevron {
    color: white;
}

/* Answer Collapsible Logic */
.faq-answer-panel {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal) ease-out, opacity var(--transition-normal) ease-out;
    opacity: 0;
}

.faq-answer-inner {
    padding: 0 24px 24px 24px;
}

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

/* 8. Footer */
.site-footer {
    background-color: var(--primary);
    color: white;
    padding: 80px 0 40px 0;
}

.footer-container {
    display: flex;
    flex-direction: column;
    gap: 48px;
}

.footer-top {
    display: flex;
    justify-content: space-between;
    gap: 60px;
    flex-wrap: wrap;
}

.footer-brand {
    max-width: 450px;
}

.footer-logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: white;
    display: block;
    margin-bottom: 16px;
}

.footer-desc {
    font-size: 0.9rem;
    color: #94a3b8;
    line-height: 1.6;
}

.footer-links-group {
    max-width: 400px;
}

.footer-links-group h5 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: white;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-contact {
    font-size: 0.9rem;
    color: #94a3b8;
    line-height: 1.6;
}

.footer-bottom {
    border-top: 1px solid var(--primary-muted);
    padding-top: 32px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.copyright {
    font-size: 0.85rem;
    color: #94a3b8;
}

.disclaimer {
    font-size: 0.78rem;
    color: #64748b;
    line-height: 1.5;
}

.disclaimer strong {
    color: #94a3b8;
}

/* ==========================================================================
   9. Media Queries (Responsive Styling)
   ========================================================================== */

/* Tablet Viewports */
@media (max-width: 1024px) {
    section {
        padding: 80px 0;
    }
    
    .hero-container {
        grid-template-columns: 1.1fr 0.9fr;
        gap: 40px;
    }
    
    .hero-title {
        font-size: 2.75rem;
    }
    
    .video-grid {
        grid-template-columns: 1fr; /* Stack video and list */
    }
    
    .video-playlist {
        max-height: 400px;
    }
    
    .dual-calculators-grid {
        grid-template-columns: 1fr;
    }
    
    .calculator-grid {
        grid-template-columns: 1fr; /* Stack calculator sides */
    }
    
    .calc-inputs-column {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding: 40px;
    }
    
    .calc-outputs-column {
        padding: 40px;
    }
}

/* Mobile Viewports */
@media (max-width: 768px) {
    html {
        font-size: 15px;
    }
    
    section {
        padding: 60px 0;
    }
    
    .site-header {
        padding: 12px 0;
    }
    
    .header-container {
        flex-direction: column;
        gap: 16px;
    }
    
    .nav-links {
        gap: 20px;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .cta-button {
        display: none; /* Hide secondary cta on mobile header to save space */
    }
    
    .hero-container {
        grid-template-columns: 1fr; /* Stack layout */
        gap: 40px;
    }
    
    .hero-content {
        text-align: center;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .hero-title {
        font-size: 2.25rem;
    }
    
    .section-title {
        font-size: 1.85rem;
    }
    
    .calc-title {
        font-size: 1.65rem;
    }
    
    .playlist-card {
        padding: 12px 16px;
    }
    
    .playlist-thumb {
        width: 80px;
        height: 53px;
    }
    
    .milestone-card {
        flex-direction: column;
        gap: 12px;
    }
    
    .milestone-icon {
        width: 40px;
        height: 40px;
    }
    
    .footer-top {
        flex-direction: column;
        gap: 32px;
    }
}