/* ==========================================================================
   Daniel Gurczynski — PHP Platform Engineering Journey
   Hand-crafted dark/light theme with organic modern feel
   ========================================================================== */

/* ---- Theme: Dark (default) — matching danielgurczynski.com ---- */
:root,
[data-theme="dark"] {
    --bg-primary: hsl(240 6% 10%);
    --bg-secondary: hsl(240 4% 16%);
    --bg-card: hsl(240 6% 10%);
    --bg-card-hover: hsl(240 4% 16%);
    --bg-code: hsl(225 15% 12%);
    --bg-input: hsl(240 4% 16%);
    --text-primary: hsl(240 5% 93%);
    --text-secondary: hsl(240 5% 65%);
    --text-muted: hsl(240 5% 65%);
    --accent: hsl(168 60% 45%);
    --accent-hover: hsl(168 60% 55%);
    --accent-subtle: hsl(168 60% 45% / 0.1);
    --accent-purple: #b388ff;
    --accent-green: hsl(168 60% 50%);
    --accent-yellow: #ffd55e;
    --accent-red: hsl(0 84% 60%);
    --accent-orange: #ffaa44;
    --accent-blue: #5a9aff;
    --border: hsl(240 4% 16%);
    --border-hover: hsl(240 4% 20%);
    --glow: 0 0 24px hsl(168 60% 45% / 0.25);
    --glow-sm: 0 0 12px hsl(168 60% 45% / 0.2);
    --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.4);
    --shadow-card-hover: 0 8px 30px rgba(0, 0, 0, 0.5);
    --grain-opacity: 0.03;
    --code-header-bg: rgba(255, 255, 255, 0.015);
    --nav-bg: hsl(240 6% 10% / 0.82);
    --scrollbar-track: hsl(240 4% 16%);
    --scrollbar-thumb: hsl(240 4% 20%);
    --selection-bg: var(--accent);
    --selection-fg: #09090b;
    --theme-icon-sun: block;
    --theme-icon-moon: none;
}

/* ---- Theme: Light ---- */
[data-theme="light"] {
    --bg-primary: hsl(0 0% 100%);
    --bg-secondary: hsl(240 5% 96%);
    --bg-card: hsl(0 0% 100%);
    --bg-card-hover: hsl(240 5% 96%);
    --bg-code: hsl(225 15% 17%);
    --bg-input: hsl(0 0% 100%);
    --text-primary: hsl(240 10% 4%);
    --text-secondary: hsl(240 4% 46%);
    --text-muted: hsl(240 4% 46%);
    --accent: hsl(168 60% 40%);
    --accent-hover: hsl(168 60% 35%);
    --accent-subtle: hsl(168 60% 40% / 0.08);
    --accent-purple: #7c4dff;
    --accent-green: hsl(168 60% 35%);
    --accent-yellow: #c08b00;
    --accent-red: hsl(0 84% 60%);
    --accent-orange: #e07000;
    --accent-blue: #2962ff;
    --border: hsl(240 6% 90%);
    --border-hover: hsl(240 6% 85%);
    --glow: 0 0 20px hsl(168 60% 40% / 0.15);
    --glow-sm: 0 0 8px hsl(168 60% 40% / 0.12);
    --shadow-card: 0 1px 4px rgba(0, 0, 0, 0.06), 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-card-hover: 0 4px 16px rgba(0, 0, 0, 0.08);
    --grain-opacity: 0.015;
    --code-header-bg: rgba(0, 0, 0, 0.03);
    --nav-bg: hsl(0 0% 100% / 0.85);
    --scrollbar-track: hsl(240 5% 96%);
    --scrollbar-thumb: hsl(240 6% 90%);
    --selection-bg: hsl(168 60% 40%);
    --selection-fg: #ffffff;
    --theme-icon-sun: none;
    --theme-icon-moon: block;
}

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

html {
    scroll-behavior: smooth;
    scrollbar-width: thin;
    scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.65;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

::selection {
    background: var(--selection-bg);
    color: var(--selection-fg);
}

::-webkit-scrollbar { width: 7px; }
::-webkit-scrollbar-track { background: var(--scrollbar-track); }
::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 4px; }

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

.top-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 0 24px;
    height: 54px;
    background: var(--nav-bg);
    backdrop-filter: blur(16px) saturate(1.4);
    -webkit-backdrop-filter: blur(16px) saturate(1.4);
    border-bottom: 1px solid var(--border);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 14px;
    white-space: nowrap;
}

.nav-logo {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    background: var(--accent);
    color: var(--bg-primary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    font-weight: 800;
    border-radius: 8px;
    letter-spacing: -0.5px;
}

.nav-title {
    color: var(--text-primary);
    letter-spacing: -0.3px;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-left: auto;
}

.nav-progress {
    flex: 1;
    height: 2px;
    background: var(--border);
    border-radius: 1px;
    overflow: hidden;
    min-width: 80px;
}

.nav-progress-bar {
    height: 100%;
    width: 0%;
    background: var(--accent);
    border-radius: 1px;
    transition: width 0.3s ease;
}

.nav-skills {
    display: flex;
    gap: 4px;
}

.nav-skill-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--border);
    transition: all 0.3s ease;
}

.nav-skill-dot.unlocked {
    background: var(--accent);
    box-shadow: var(--glow-sm);
}

.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}

.theme-toggle:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-subtle);
}

.theme-icon--sun { display: var(--theme-icon-sun); }
.theme-icon--moon { display: var(--theme-icon-moon); }

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

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 100px 24px 60px;
    overflow: hidden;
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(var(--accent-subtle) 1px, transparent 1px),
        linear-gradient(90deg, var(--accent-subtle) 1px, transparent 1px);
    background-size: 64px 64px;
    mask-image: radial-gradient(ellipse 50% 50% at 50% 50%, black 10%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse 50% 50% at 50% 50%, black 10%, transparent 70%);
    opacity: 0.6;
}

.hero-grain {
    position: absolute;
    inset: 0;
    opacity: var(--grain-opacity);
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    pointer-events: none;
}

.hero-content {
    position: relative;
    text-align: center;
    max-width: 780px;
}

.hero-badge {
    display: inline-block;
    padding: 5px 14px;
    border: 1px solid var(--border);
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    letter-spacing: 1.5px;
    text-transform: uppercase;
    margin-bottom: 20px;
    opacity: 0;
    transform: translateY(20px);
}

.hero-byline {
    font-size: 15px;
    color: var(--text-muted);
    margin-bottom: 28px;
    opacity: 0;
    transform: translateY(20px);
}

.hero-byline strong {
    color: var(--text-primary);
    font-weight: 600;
}

.hero-title {
    font-size: clamp(2.4rem, 5.5vw, 4.2rem);
    font-weight: 900;
    line-height: 1.08;
    letter-spacing: -1.5px;
    margin-bottom: 24px;
}

.hero-line {
    display: block;
    opacity: 0;
    transform: translateY(30px);
}

.hero-line--serif {
    font-family: 'Instrument Serif', Georgia, serif;
    font-weight: 400;
    font-style: italic;
    letter-spacing: 0;
    color: var(--accent);
}

.hero-subtitle {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 560px;
    margin: 0 auto 40px;
    opacity: 0;
    transform: translateY(20px);
    line-height: 1.7;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 36px;
    margin-bottom: 40px;
    opacity: 0;
    transform: translateY(20px);
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
}

.stat-num {
    font-size: 1.8rem;
    font-weight: 800;
    font-family: 'JetBrains Mono', monospace;
    color: var(--accent);
    letter-spacing: -1px;
}

.stat-label {
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    font-weight: 600;
}

.hero-cta {
    opacity: 0;
    transform: translateY(20px);
    margin-bottom: 20px;
}

.hero-scroll-indicator {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.5px;
    opacity: 0;
    margin-top: 20px;
}

.scroll-arrow {
    width: 18px;
    height: 18px;
    border-right: 2px solid var(--accent);
    border-bottom: 2px solid var(--accent);
    transform: rotate(45deg);
    animation: scrollBounce 2s infinite;
}

@keyframes scrollBounce {
    0%, 100% { transform: rotate(45deg) translateY(0); }
    50% { transform: rotate(45deg) translateY(5px); }
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 11px 22px;
    border: none;
    border-radius: 10px;
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
    letter-spacing: -0.2px;
}

.btn-primary {
    background: var(--accent);
    color: var(--bg-primary);
}
.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: var(--glow);
}

.btn-warn {
    background: var(--accent-orange);
    color: #fff;
}
.btn-warn:hover {
    transform: translateY(-1px);
    box-shadow: 0 0 16px rgba(255, 170, 68, 0.25);
}

.btn-success {
    background: var(--accent-green);
    color: #fff;
}
.btn-success:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 0 16px rgba(94, 230, 160, 0.25);
}

.btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
    transform: none;
}

.btn-glow {
    animation: btnGlow 2.5s infinite alternate;
}

@keyframes btnGlow {
    from { box-shadow: 0 0 8px rgba(0, 212, 255, 0.15); }
    to   { box-shadow: 0 0 24px rgba(0, 212, 255, 0.4); }
}

[data-theme="light"] .btn-glow {
    animation-name: btnGlowLight;
}
@keyframes btnGlowLight {
    from { box-shadow: 0 0 6px rgba(0, 136, 204, 0.1); }
    to   { box-shadow: 0 0 18px rgba(0, 136, 204, 0.25); }
}

/* ==========================================================================
   Chapters
   ========================================================================== */

.chapter {
    position: relative;
    padding: 100px 24px 80px;
    max-width: 1160px;
    margin: 0 auto;
    opacity: 0;
    transform: translateY(40px);
}

.chapter::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 1px;
    background: var(--border);
}

.chapter-header {
    text-align: center;
    margin-bottom: 56px;
}

.chapter-number {
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: 3px;
    margin-bottom: 14px;
    opacity: 0.6;
}

.chapter-title {
    font-size: clamp(1.7rem, 3.5vw, 2.6rem);
    font-weight: 800;
    letter-spacing: -0.8px;
    margin-bottom: 12px;
}

.chapter-subtitle {
    color: var(--text-muted);
    font-size: 1rem;
    max-width: 520px;
    margin: 0 auto;
}

.chapter-body {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 28px;
    align-items: start;
}

.chapter-content--full {
    grid-column: 1 / -1;
}

.chapter-side {
    position: sticky;
    top: 76px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

/* ==========================================================================
   Story Cards & Code Blocks
   ========================================================================== */

.story-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 28px;
    margin-bottom: 20px;
    box-shadow: var(--shadow-card);
    transition: box-shadow 0.3s;
}

.story-card:hover {
    box-shadow: var(--shadow-card-hover);
}

.story-card h3 {
    font-size: 1rem;
    margin-bottom: 12px;
    color: var(--accent);
    font-weight: 700;
    letter-spacing: -0.3px;
}

.story-card p {
    color: var(--text-secondary);
    margin-bottom: 12px;
    line-height: 1.75;
    font-size: 15px;
}

.story-card p:last-child { margin-bottom: 0; }

.code-block {
    background: var(--bg-code);
    border: 1px solid var(--border);
    border-radius: 14px;
    overflow: hidden;
    margin-bottom: 20px;
    box-shadow: var(--shadow-card);
}

.code-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 11px 16px;
    background: var(--code-header-bg);
    border-bottom: 1px solid var(--border);
}

.code-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}
.code-dot.red { background: #ff5f56; }
.code-dot.yellow { background: #ffbd2e; }
.code-dot.green { background: #27c93f; }

.code-filename {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    color: var(--text-muted);
    margin-left: 8px;
}

.code-block pre {
    padding: 20px;
    overflow-x: auto;
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    line-height: 1.7;
    color: var(--text-secondary);
}

.code-block code { font-family: 'JetBrains Mono', monospace; }

.keyword { color: var(--accent-purple); }
.class-name { color: var(--accent-yellow); }
.func { color: var(--accent-green); }
.var { color: var(--accent); }
.string { color: var(--accent-orange); }
.num { color: var(--accent-yellow); }
.comment { color: var(--text-muted); font-style: italic; }
.type { color: var(--accent-blue); }
.php-tag { color: var(--accent-red); }

/* ==========================================================================
   Demo Boxes
   ========================================================================== */

.demo-box {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 28px;
    margin-bottom: 20px;
    box-shadow: var(--shadow-card);
}

.demo-box h4 {
    font-size: 1rem;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-weight: 700;
    letter-spacing: -0.3px;
}

.demo-box > p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 20px;
    line-height: 1.65;
}

.demo-box code {
    font-family: 'JetBrains Mono', monospace;
    background: var(--accent-subtle);
    padding: 2px 7px;
    border-radius: 6px;
    font-size: 13px;
    color: var(--accent);
}

.demo-controls {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.demo-output {
    background: var(--bg-code);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 16px;
    animation: fadeInUp 0.4s ease;
}

.output-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    color: var(--text-muted);
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    font-weight: 600;
}

.demo-output pre {
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    line-height: 1.6;
    color: var(--accent-green);
    white-space: pre-wrap;
    word-break: break-all;
}

/* ==========================================================================
   Select Input
   ========================================================================== */

.select-input {
    padding: 10px 14px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    outline: none;
    cursor: pointer;
    transition: border-color 0.2s;
    -webkit-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L5 5L9 1' stroke='%23888' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 32px;
}

.select-input:focus { border-color: var(--accent); }

/* ==========================================================================
   Skill Badges
   ========================================================================== */

.skill-badge {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 14px;
    transition: all 0.4s ease;
    box-shadow: var(--shadow-card);
}

.skill-badge.locked { opacity: 0.45; }

.skill-badge.unlocked {
    border-color: var(--accent);
    box-shadow: var(--glow);
    opacity: 1;
}

.skill-badge.unlocked .badge-icon { animation: badgePop 0.5s ease; }

@keyframes badgePop {
    0% { transform: scale(0.5); }
    50% { transform: scale(1.25); }
    100% { transform: scale(1); }
}

.badge-icon {
    font-size: 24px;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border-radius: 12px;
    flex-shrink: 0;
}

.badge-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.badge-name {
    font-weight: 700;
    font-size: 13px;
    letter-spacing: -0.2px;
}

.badge-desc {
    font-size: 12px;
    color: var(--text-muted);
}

/* ==========================================================================
   Why Cards
   ========================================================================== */

.why-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-left: 3px solid var(--accent-purple);
    border-radius: 14px;
    padding: 18px;
    box-shadow: var(--shadow-card);
}

.why-card h4 {
    font-size: 11px;
    color: var(--accent-purple);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 10px;
    font-weight: 700;
}

.why-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.65;
}

/* ==========================================================================
   API Flow
   ========================================================================== */

.api-flow {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 16px;
    padding: 16px;
    background: var(--accent-subtle);
    border-radius: 10px;
}

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

.api-method {
    display: inline-block;
    padding: 4px 12px;
    background: var(--accent-blue);
    color: #fff;
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    font-weight: 700;
    border-radius: 6px;
    margin-bottom: 4px;
}

.api-method.success { background: var(--accent-green); }

.api-url {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    color: var(--text-muted);
}

.api-arrow {
    font-size: 20px;
    color: var(--accent);
}

/* ==========================================================================
   Event Log
   ========================================================================== */

.event-log {
    background: var(--bg-code);
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
}

.event-log-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 11px 16px;
    background: var(--code-header-bg);
    border-bottom: 1px solid var(--border);
}

.log-title {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
}

.log-count {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    color: var(--text-muted);
}

.event-log-body {
    padding: 10px;
    max-height: 300px;
    overflow-y: auto;
}

.event-empty {
    text-align: center;
    padding: 24px;
    color: var(--text-muted);
    font-size: 13px;
}

.event-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 10px 12px;
    background: var(--accent-subtle);
    border: 1px solid var(--border);
    border-radius: 8px;
    margin-bottom: 6px;
    animation: eventSlideIn 0.4s ease;
}

@keyframes eventSlideIn {
    from { opacity: 0; transform: translateX(-16px); }
    to   { opacity: 1; transform: translateX(0); }
}

.event-status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-top: 6px;
    flex-shrink: 0;
}

.event-status-dot.processed { background: var(--accent-green); }
.event-status-dot.failed { background: var(--accent-red); }

.event-info { flex: 1; min-width: 0; }

.event-type {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    font-weight: 600;
    color: var(--accent);
}

.event-time, .event-id {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    color: var(--text-muted);
}

/* ==========================================================================
   OAuth Flow
   ========================================================================== */

.oauth-flow {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.oauth-step {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 16px;
    background: var(--bg-code);
    border: 1px solid var(--border);
    border-radius: 10px;
    opacity: 0;
    transform: translateY(10px);
}

.oauth-step.active {
    opacity: 1;
    transform: translateY(0);
    border-color: var(--accent);
    box-shadow: var(--glow-sm);
}

.step-number {
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent);
    color: var(--bg-primary);
    font-weight: 800;
    font-size: 13px;
    border-radius: 50%;
    flex-shrink: 0;
}

.step-content { flex: 1; }

.step-name {
    font-weight: 700;
    font-size: 14px;
    margin-bottom: 4px;
    color: var(--text-primary);
    letter-spacing: -0.2px;
}

.step-desc {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 8px;
    line-height: 1.6;
}

.step-code {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 10px 12px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    color: var(--accent-green);
    white-space: pre-wrap;
    word-break: break-all;
}

/* ==========================================================================
   Performance Results
   ========================================================================== */

.perf-results {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.perf-card {
    background: var(--bg-code);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 20px;
}

.perf-card.slow { border-color: var(--accent-red); }
.perf-card.fast { border-color: var(--accent-green); }

.perf-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
}

.perf-label {
    font-weight: 700;
    font-size: 14px;
    letter-spacing: -0.2px;
}

.perf-time {
    font-family: 'JetBrains Mono', monospace;
    font-size: 20px;
    font-weight: 800;
}

.perf-card.slow .perf-time { color: var(--accent-red); }
.perf-card.fast .perf-time { color: var(--accent-green); }

.perf-bar-wrap {
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 14px;
}

.perf-bar {
    height: 100%;
    border-radius: 3px;
    transition: width 1s ease;
}

.perf-bar.slow { background: var(--accent-red); }
.perf-bar.fast { background: var(--accent-green); }

.perf-analysis {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 12px;
    line-height: 1.6;
}

.perf-sql {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    color: var(--accent-orange);
    white-space: pre-wrap;
    word-break: break-all;
    max-height: 200px;
    overflow-y: auto;
}

.perf-improvement {
    display: inline-block;
    margin-top: 12px;
    padding: 4px 12px;
    background: var(--accent-subtle);
    border: 1px solid var(--accent-green);
    border-radius: 20px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    font-weight: 700;
    color: var(--accent-green);
}

/* ==========================================================================
   Members Table (Chapter 7)
   ========================================================================== */

.search-input {
    flex: 1;
    padding: 10px 16px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    outline: none;
    transition: border-color 0.2s;
    min-width: 200px;
}

.search-input:focus { border-color: var(--accent); }
.search-input::placeholder { color: var(--text-muted); }

.filter-pills {
    display: flex;
    gap: 6px;
}

.pill {
    padding: 6px 14px;
    background: var(--bg-code);
    border: 1px solid var(--border);
    border-radius: 20px;
    color: var(--text-secondary);
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

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

.pill.active {
    background: var(--accent);
    color: var(--bg-primary);
    border-color: var(--accent);
}

.demo-box--wide { grid-column: 1 / -1; }

.members-table-wrap {
    overflow-x: auto;
    margin-bottom: 16px;
    border-radius: 10px;
    border: 1px solid var(--border);
}

.members-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.members-table th {
    text-align: left;
    padding: 11px 16px;
    background: var(--bg-code);
    border-bottom: 1px solid var(--border);
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-muted);
}

.members-table td {
    padding: 11px 16px;
    border-bottom: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 14px;
}

.members-table tbody tr { transition: background 0.15s; }
.members-table tbody tr:hover { background: var(--bg-card-hover); }
.members-table tbody tr:last-child td { border-bottom: none; }

.status-badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 10px;
    font-size: 12px;
    font-weight: 600;
}

.status-badge.active {
    background: rgba(94, 230, 160, 0.1);
    color: var(--accent-green);
    border: 1px solid rgba(94, 230, 160, 0.25);
}

.status-badge.flagged {
    background: rgba(255, 107, 107, 0.1);
    color: var(--accent-red);
    border: 1px solid rgba(255, 107, 107, 0.25);
}

.status-badge.pending {
    background: rgba(255, 213, 94, 0.1);
    color: var(--accent-yellow);
    border: 1px solid rgba(255, 213, 94, 0.25);
}

.member-stats {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.member-stat {
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    color: var(--text-muted);
}

.member-stat strong { color: var(--accent); }

/* ==========================================================================
   Architecture Cards (Chapter 8)
   ========================================================================== */

.architecture-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 14px;
    margin-bottom: 36px;
}

.arch-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 24px;
    transition: all 0.25s ease;
    cursor: default;
    box-shadow: var(--shadow-card);
}

.arch-card:hover {
    border-color: var(--accent);
    transform: translateY(-3px);
    box-shadow: var(--shadow-card-hover), var(--glow-sm);
}

.arch-icon { font-size: 28px; margin-bottom: 12px; }

.arch-card h4 {
    font-size: 1rem;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-weight: 700;
    letter-spacing: -0.3px;
}

.arch-card p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.65;
    margin-bottom: 12px;
}

.arch-example {
    padding: 8px 12px;
    background: var(--bg-code);
    border: 1px solid var(--border);
    border-radius: 8px;
}

.arch-example code {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    color: var(--accent-green);
}

.final-summary { max-width: 680px; margin: 0 auto; }

.summary-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 32px;
    text-align: center;
    box-shadow: var(--shadow-card);
}

.summary-card h3 { margin-bottom: 28px; color: var(--text-primary); }

.arch-diagram {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.arch-layer {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 13px 18px;
    background: var(--bg-code);
    border: 1px solid var(--border);
    border-radius: 10px;
}

.layer-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    font-weight: 700;
    color: var(--accent);
    min-width: 72px;
    text-align: left;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.layer-items {
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    color: var(--text-secondary);
}

.arch-arrow {
    text-align: center;
    color: var(--accent);
    font-size: 14px;
    line-height: 1;
    opacity: 0.5;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
    border-top: 1px solid var(--border);
    padding: 60px 24px 48px;
    text-align: center;
}

.footer-content { max-width: 560px; margin: 0 auto; }

.footer-badge-completion {
    background: var(--accent-subtle);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 28px;
    margin-bottom: 40px;
    animation: fadeInUp 0.6s ease;
}

.footer-badge-completion h3 {
    font-size: 1.4rem;
    margin-bottom: 8px;
    color: var(--accent);
    font-weight: 800;
    letter-spacing: -0.5px;
}

.footer-badge-completion p { color: var(--text-secondary); }

.footer-sign-off { margin-top: 8px; }

.footer-name {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 8px;
    font-weight: 500;
}

.footer-name strong { font-weight: 700; }

.footer-stack {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 16px;
}

.footer-note {
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    color: var(--accent);
}

.footer-note code {
    background: var(--accent-subtle);
    padding: 2px 8px;
    border-radius: 6px;
}

/* ==========================================================================
   Animations
   ========================================================================== */

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

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

@media (max-width: 900px) {
    .chapter-body { grid-template-columns: 1fr; }

    .chapter-side {
        position: static;
        flex-direction: row;
        flex-wrap: wrap;
    }

    .skill-badge, .why-card { flex: 1; min-width: 240px; }

    .hero-stats { gap: 20px; flex-wrap: wrap; }
    .filter-pills { flex-wrap: wrap; }

    .arch-layer {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }

    .layer-label { min-width: auto; }
    .api-flow { flex-direction: column; }
}

@media (max-width: 600px) {
    .top-nav { padding: 0 12px; gap: 10px; }
    .nav-title { display: none; }
    .nav-skills { display: none; }
    .hero { padding: 80px 16px 60px; }
    .chapter { padding: 60px 16px 40px; }
    .demo-box, .story-card { padding: 20px; }
    .architecture-grid { grid-template-columns: 1fr; }
    .hero-stats { gap: 16px; }
    .stat-num { font-size: 1.5rem; }
}