/* ======================
   IARU ACADEMY - TECH GRID THEME
   Inspired by modern tech/portfolio aesthetics
   ====================== */

/* ======================
   VARIABLES & RESET
   ====================== */
:root {
    /* Light Tech Palette */
    --bg-primary: #f5f5f5;
    --bg-secondary: #ffffff;
    --bg-grid: #e8e8e8;

    /* Text Colors */
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --text-muted: #999999;

    /* Accent Colors */
    --accent-orange: #f97316;
    --accent-orange-hover: #ea580c;

    /* Borders */
    --border-color: #e0e0e0;
    --border-dark: #d0d0d0;

    /* Typography */
    --font-display: 'Space Grotesk', -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;

    /* Grid Pattern */
    --grid-size: 40px;

    /* Transitions */
    --transition: all 0.2s ease;
}

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

html {
    scroll-behavior: smooth;
    height: 100%;
}

body {
    font-family: var(--font-display);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 14px;
    min-height: 100%;
    display: flex;
    flex-direction: column;

    /* Grid Pattern Background */
    background-image:
        linear-gradient(var(--bg-grid) 1px, transparent 1px),
        linear-gradient(90deg, var(--bg-grid) 1px, transparent 1px);
    background-size: var(--grid-size) var(--grid-size);
    background-position: -1px -1px;
}

#mainContent {
    flex: 1;
}

/* ======================
   TYPOGRAPHY
   ====================== */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-display);
    font-weight: 700;
    letter-spacing: -0.02em;
}

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

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

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

/* ======================
   NAVIGATION
   ====================== */
.navbar {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.brand-logo {
    height: 40px;
    width: auto;
}

.brand-icon {
    color: var(--text-primary);
}

.brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.brand-name {
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    color: var(--text-primary);
}

.brand-sub {
    font-size: 0.65rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    color: var(--text-muted);
}

.nav-menu {
    display: flex;
    gap: 0.25rem;
    list-style: none;
}

.nav-link {
    color: var(--text-secondary);
    padding: 0.5rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 500;
    transition: var(--transition);
    border-radius: 4px;
}

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

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

.nav-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.btn-cta {
    background: var(--accent-orange);
    color: white;
    border: none;
    padding: 0.625rem 1.25rem;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: var(--transition);
    border-radius: 4px;
}

.btn-cta:hover {
    background: var(--accent-orange-hover);
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-toggle span {
    width: 18px;
    height: 2px;
    background: var(--text-primary);
}

/* ======================
   SECTIONS
   ====================== */
.section {
    padding: 4rem 0;
    display: none;
}

.section.active {
    display: block;
}

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

.section-badge {
    display: inline-block;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 0.25rem 0.75rem;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 0.75rem;
}

.section-subtitle {
    font-size: 0.9rem;
    color: var(--text-secondary);
    max-width: 500px;
}

/* ======================
   HERO SECTION
   ====================== */
.hero-section {
    padding: 2rem 0 4rem;
}

.hero-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.hero-main {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1;
    margin-bottom: 1.5rem;
}

.hero-description {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.7;
    max-width: 500px;
}

/* Projects Counter */
.projects-counter {
    margin-bottom: 2rem;
}

.counter-label {
    display: block;
    font-size: 0.65rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.counter-value {
    font-family: var(--font-mono);
    font-size: 2.5rem;
    font-weight: 700;
}

/* Filter Section */
.filter-section {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.filter-tabs {
    display: flex;
    gap: 0.5rem;
}

.filter-tab {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border-radius: 20px;
}

.filter-tab:hover {
    border-color: var(--text-primary);
}

.filter-tab.active {
    background: var(--text-primary);
    color: white;
    border-color: var(--text-primary);
}

.filter-search {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: 0.75rem;
    cursor: pointer;
}

.filter-search:hover {
    color: var(--text-primary);
}

/* Featured Card */
.hero-featured {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    position: relative;
}

.featured-badge {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.badge-new {
    background: var(--accent-orange);
    color: white;
    padding: 0.25rem 0.5rem;
    font-size: 0.6rem;
    font-weight: 600;
    text-transform: uppercase;
}

.badge-type {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    padding: 0.25rem 0.5rem;
    font-size: 0.6rem;
    font-weight: 500;
}

.featured-icon {
    width: 64px;
    height: 64px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.featured-content h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.featured-content p {
    font-size: 0.8rem;
    margin-bottom: 1.5rem;
}

.featured-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    padding: 1rem 0;
    border-top: 1px solid var(--border-color);
}

.stat-item {
    text-align: left;
}

.stat-value {
    display: block;
    font-size: 1rem;
    font-weight: 700;
}

.stat-label {
    display: block;
    font-size: 0.65rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

.featured-arrow {
    position: absolute;
    bottom: 1.5rem;
    right: 1.5rem;
    font-size: 1.25rem;
    color: var(--accent-orange);
}

/* Projects Counter */
.projects-counter {
    margin-bottom: 2rem;
}

.counter-label {
    display: block;
    font-size: 0.65rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.counter-value {
    font-family: var(--font-mono);
    font-size: 2.5rem;
    font-weight: 700;
}

/* Filter Section */
.filter-section {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.filter-tabs {
    display: flex;
    gap: 0.5rem;
}

.filter-tab {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border-radius: 20px;
}

.filter-tab:hover {
    border-color: var(--text-primary);
}

.filter-tab.active {
    background: var(--text-primary);
    color: white;
    border-color: var(--text-primary);
}

.filter-search {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: 0.75rem;
    cursor: pointer;
}

.filter-search:hover {
    color: var(--text-primary);
}

/* Content Grid */
.content-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.content-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    position: relative;
    cursor: pointer;
    transition: var(--transition);
}

.content-card:hover {
    border-color: var(--accent-orange);
    box-shadow: 0 4px 12px rgba(249, 115, 22, 0.15);
}

.content-card:hover .card-arrow {
    color: var(--accent-orange);
    transform: translateX(4px);
}

.content-card:hover .card-logo svg {
    color: var(--accent-orange);
}

.card-tag {
    display: inline-block;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    padding: 0.25rem 0.5rem;
    font-size: 0.6rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
}

.card-logo {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.card-logo svg {
    color: var(--text-secondary);
}

.card-logo span {
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.card-stats {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.stat-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

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

.stat-num {
    font-size: 0.9rem;
    font-weight: 700;
}

.stat-txt {
    font-size: 0.65rem;
    color: var(--text-muted);
}

.card-arrow {
    position: absolute;
    bottom: 1.5rem;
    right: 1.5rem;
    font-size: 1.25rem;
    color: var(--text-muted);
    transition: var(--transition);
}

/* ======================
   CODE SECTION
   ====================== */
.code-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-bottom: 2rem;
}

.code-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    transition: var(--transition);
}

.code-card:hover {
    border-color: var(--text-primary);
}

.code-card-icon {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.code-card h3 {
    font-size: 1rem;
    margin-bottom: 0.75rem;
}

.code-card p {
    font-size: 0.85rem;
}

/* Golden Rule */
.golden-rule {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-left: 3px solid var(--accent-orange);
    padding: 2rem;
    margin-bottom: 2rem;
}

.rule-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.rule-icon {
    color: var(--accent-orange);
    font-size: 1.25rem;
}

.rule-header h3 {
    font-size: 0.8rem;
    letter-spacing: 0.1em;
    font-weight: 600;
}

.golden-rule blockquote {
    font-size: 1.1rem;
    font-style: italic;
    line-height: 1.7;
    margin-bottom: 1rem;
    padding-left: 1rem;
    border-left: 2px solid var(--border-color);
}

.rule-source {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Principles Box */
.principles-box {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
}

.box-header {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.box-header h4 {
    font-size: 0.75rem;
    letter-spacing: 0.1em;
}

.principles-list {
    padding: 1.5rem;
}

.principle-item {
    display: flex;
    gap: 1rem;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
}

.principle-item:last-child {
    border-bottom: none;
}

.principle-number {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent-orange);
}

.principle-text {
    font-size: 0.9rem;
    line-height: 1.6;
}

.principle-text strong {
    font-weight: 600;
}

/* ======================
   TABS
   ====================== */
.procedure-tabs,
.tools-tabs {
    display: flex;
    gap: 0;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.tab-btn,
.tool-tab {
    flex: 1;
    padding: 1rem 1.5rem;
    background: var(--bg-secondary);
    border: none;
    border-right: 1px solid var(--border-color);
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.tab-btn:last-child,
.tool-tab:last-child {
    border-right: none;
}

.tab-btn:hover,
.tool-tab:hover {
    background: var(--bg-primary);
}

.tab-btn.active,
.tool-tab.active {
    background: var(--text-primary);
    color: white;
}

.tab-content,
.tool-content {
    display: none;
}

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

/* ======================
   PROCEDURE CONTENT
   ====================== */
.procedure-section {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    margin-bottom: 1rem;
}

.procedure-section h4 {
    font-size: 1rem;
    margin-bottom: 1rem;
}

.example-box {
    background: var(--bg-primary);
    border-left: 3px solid var(--accent-orange);
    padding: 1rem;
    margin: 1rem 0;
}

.example-box strong {
    display: block;
    font-size: 0.65rem;
    letter-spacing: 0.1em;
    color: var(--accent-orange);
    margin-bottom: 0.5rem;
}

.warning-box {
    background: #fff7ed;
    border: 1px solid var(--accent-orange);
    padding: 1rem;
    margin: 1rem 0;
}

.warning-box strong {
    display: block;
    font-size: 0.65rem;
    letter-spacing: 0.1em;
    color: var(--accent-orange);
    margin-bottom: 0.5rem;
}

/* ======================
   ADVANCED & REFERENCE GRIDS
   ====================== */
.advanced-grid,
.reference-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.advanced-card,
.reference-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    transition: var(--transition);
}

.advanced-card:hover,
.reference-card:hover {
    border-color: var(--text-primary);
}

.advanced-card h3 {
    font-size: 1rem;
    margin-bottom: 0.75rem;
}

.card-header-ref {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 1rem;
}

.card-header-ref h3 {
    font-size: 1rem;
}

.header-icon {
    font-size: 1.25rem;
}

/* Search Input */
.search-input,
.tool-input {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    font-size: 0.85rem;
    transition: var(--transition);
    margin-bottom: 1rem;
}

.search-input:focus,
.tool-input:focus {
    outline: none;
    border-color: var(--text-primary);
}

/* RST System */
.rst-table {
    margin-bottom: 1rem;
}

.rst-table h4 {
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
}

.rst-table ul {
    list-style: none;
}

.rst-table li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    gap: 1rem;
    font-size: 0.8rem;
}

.rst-number {
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--accent-orange);
    width: 16px;
}

/* Q Codes */
.q-codes-list {
    max-height: 300px;
    overflow-y: auto;
}

.q-code-item {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

.q-code-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.25rem;
}

.q-code-label {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent-orange);
}

.q-code-question {
    font-size: 0.8rem;
}

.q-code-answer {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* ======================
   TOOLS
   ====================== */
.tool-box {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 2rem;
}

.tool-header {
    margin-bottom: 1.5rem;
}

.tool-header h3 {
    font-size: 1rem;
    letter-spacing: 0.02em;
}

.phonetic-output {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    min-height: 80px;
}

.phonetic-char {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    padding: 1rem 0.75rem;
    text-align: center;
    min-width: 90px;
    transition: var(--transition);
}

.phonetic-char:hover {
    border-color: var(--accent-orange);
}

.phonetic-original {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-orange);
    display: block;
}

.phonetic-word {
    font-size: 0.75rem;
    font-weight: 600;
    display: block;
    margin-top: 0.25rem;
}

.phonetic-pron {
    font-size: 0.65rem;
    color: var(--text-muted);
    display: block;
    font-style: italic;
}

.placeholder-text {
    color: var(--text-muted);
    font-style: italic;
    width: 100%;
    text-align: center;
    padding: 2rem;
}

/* RST Controls */
.rst-controls {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.rst-control label {
    display: block;
    font-size: 0.7rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.rst-select {
    width: 100%;
    padding: 0.75rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    font-size: 0.8rem;
    cursor: pointer;
}

.rst-select:focus {
    outline: none;
    border-color: var(--text-primary);
}

.rst-result {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    text-align: center;
    font-size: 0.9rem;
}

.rst-result strong {
    font-family: var(--font-mono);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-orange);
    display: block;
    margin-top: 0.5rem;
}

/* QCode Results */
.qcode-results {
    max-height: 400px;
    overflow-y: auto;
}

/* ======================
   QUIZ
   ====================== */
.quiz-container {
    max-width: 700px;
}

.quiz-intro,
.quiz-results {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 2.5rem;
    text-align: center;
}

.quiz-intro h3,
.quiz-results h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.quiz-intro p {
    margin-bottom: 1.5rem;
}

.btn,
.btn-primary,
.btn-outline {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.5rem;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: var(--transition);
    border-radius: 4px;
}

.btn-primary {
    background: var(--accent-orange);
    color: white;
    border: none;
}

.btn-primary:hover {
    background: var(--accent-orange-hover);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-outline:hover {
    border-color: var(--text-primary);
}

/* Quiz Container */
.quiz-container {
    max-width: 100%;
}

.quiz-start {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 3rem;
    text-align: center;
}

.quiz-start h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.quiz-start p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.quiz-start .btn-primary {
    padding: 1rem 2rem;
    font-size: 0.85rem;
}

/* Quiz Card */
.quiz-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
}

.quiz-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.quiz-progress {
    display: block;
    font-size: 0.7rem;
    font-weight: 500;
    margin-bottom: 0.75rem;
}

.progress-bar {
    height: 3px;
    background: var(--border-color);
    border-radius: 2px;
}

.progress-fill {
    height: 100%;
    background: var(--accent-orange);
    border-radius: 2px;
    transition: width 0.3s ease;
}

.quiz-body {
    padding: 1.5rem;
}

.quiz-question {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    line-height: 1.5;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.quiz-option {
    padding: 1rem;
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
}

.quiz-option:hover {
    border-color: var(--text-primary);
    background: var(--bg-primary);
}

.quiz-option.correct {
    border-color: #22c55e;
    background: #f0fdf4;
}

.quiz-option.incorrect {
    border-color: #ef4444;
    background: #fef2f2;
}

.quiz-option.disabled {
    pointer-events: none;
}

.quiz-option.correct svg {
    color: #22c55e;
}

.quiz-option.incorrect svg {
    color: #ef4444;
}

.quiz-explanation {
    margin-top: 1.5rem;
    padding: 1rem;
    background: var(--bg-primary);
    border-left: 3px solid var(--accent-orange);
}

.quiz-explanation strong {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.8rem;
}

.quiz-explanation p {
    font-size: 0.85rem;
    margin-bottom: 0;
}

/* Results */
.results-icon {
    margin-bottom: 1rem;
}

.results-score {
    font-family: var(--font-mono);
    font-size: 3rem;
    font-weight: 700;
    color: var(--accent-orange);
    margin-bottom: 0.75rem;
}

/* ======================
   CTA SECTION
   ====================== */
.cta-section {
    padding: 3rem 0;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

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

.cta-left {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.cta-marker {
    color: var(--accent-orange);
    font-size: 1rem;
}

.cta-text {
    display: flex;
    flex-direction: column;
    font-size: 0.8rem;
    font-weight: 600;
}

.cta-highlight {
    background: var(--text-primary);
    color: white;
    padding: 0.25rem 0.5rem;
    display: inline-block;
}

.cta-buttons {
    display: flex;
    gap: 0.75rem;
}

/* ======================
   FOOTER
   ====================== */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.footer-logo {
    height: 36px;
    width: auto;
}

.footer-name {
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.02em;
}

.footer-center {
    text-align: center;
    flex: 1;
}

.footer-center p {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.footer-credit {
    margin-top: 0.5rem;
}

.footer-credit a {
    color: var(--accent-orange);
    font-weight: 600;
}

.footer-credit a:hover {
    text-decoration: underline;
}

.footer-links {
    display: flex;
    gap: 1rem;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    transition: var(--transition);
}

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

/* ======================
   SCROLLBAR
   ====================== */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-dark);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ======================
   RESPONSIVE
   ====================== */
@media (max-width: 1024px) {
    .hero-layout {
        grid-template-columns: 1fr;
    }

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

    .rst-controls {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-secondary);
        border-bottom: 1px solid var(--border-color);
        flex-direction: column;
        padding: 1rem;
    }

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

    .nav-link {
        padding: 0.75rem;
        text-align: center;
    }

    .mobile-toggle {
        display: flex;
    }

    .btn-cta {
        display: none;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .content-grid,
    .code-grid,
    .advanced-grid,
    .reference-grid {
        grid-template-columns: 1fr;
    }

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

    .filter-section {
        flex-direction: column;
        align-items: flex-start;
    }

    .procedure-tabs,
    .tools-tabs {
        flex-direction: column;
    }

    .cta-content {
        flex-direction: column;
        text-align: center;
    }

    .cta-left {
        justify-content: center;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

/* ======================
   ANIMATIONS
   ====================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

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

.section.active {
    animation: fadeIn 0.3s ease-out;
}