/* ===== Guide Version — The Portfolio Shift ===== */
/* Design: Scroll Storytelling + Dark/Yellow + Pretendard */

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

:root {
    --black: #0a0a0a;
    --dark: #111111;
    --dark-2: #1a1a1a;
    --dark-3: #222222;
    --gray-1: #333333;
    --gray-2: #555555;
    --gray-3: #888888;
    --gray-4: #aaaaaa;
    --gray-5: #cccccc;
    --white: #f5f5f0;
    --yellow: #ffd600;
    --yellow-dim: rgba(255, 214, 0, 0.15);
    --yellow-glow: rgba(255, 214, 0, 0.08);
    --red: #ff4444;
    --green: #44cc66;
    --blue: #4488ff;

    --font-display: 'Playfair Display', serif;
    --font-body: 'Pretendard', -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', monospace;

    --container: 1200px;
    --gap: clamp(24px, 4vw, 48px);
    --section-gap: clamp(80px, 12vh, 160px);

    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.7;
    color: var(--gray-5);
    background: var(--black);
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

/* --- Utility --- */
.g-text-yellow { color: var(--yellow); }
.g-text-dim { color: var(--gray-3); }

.g-container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 var(--gap);
    overflow-x: hidden;
}

/* --- Reveal Animation --- */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

.reveal--delay-1 { transition-delay: 0.1s; }
.reveal--delay-2 { transition-delay: 0.2s; }
.reveal--delay-3 { transition-delay: 0.3s; }
.reveal--delay-4 { transition-delay: 0.4s; }
.reveal--delay-5 { transition-delay: 0.6s; }

/* ===== HEADER ===== */
.g-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--gap);
    height: 64px;
    background: rgba(10, 10, 10, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    transition: transform 0.4s var(--ease-out);
}

.g-header.hidden {
    transform: translateY(-100%);
}

.g-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    font-weight: 600;
    color: var(--white);
    letter-spacing: 0.02em;
}

.g-logo-mark {
    color: var(--yellow);
    font-size: 10px;
}

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

.g-nav-link {
    padding: 6px 14px;
    font-size: 12px;
    font-weight: 500;
    color: var(--gray-3);
    border-radius: 100px;
    transition: color 0.3s, background 0.3s;
    letter-spacing: 0.04em;
}

.g-nav-link:hover {
    color: var(--white);
    background: var(--dark-3);
}

.g-nav-link.active {
    color: var(--black);
    background: var(--yellow);
}

.g-btn-outline {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 0;
    font-size: 12px;
    font-weight: 500;
    color: var(--gray-3);
    transition: all 0.3s;
}

.g-btn-outline:hover {
    color: var(--white);
}

.g-btn-arrow {
    font-size: 14px;
    transition: all 0.3s;
}

.g-btn-outline:hover .g-btn-arrow {
    transform: translate(2px, -2px);
    color: var(--yellow);
}

/* --- Progress Bar --- */
.g-progress {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    height: 2px;
    z-index: 99;
    background: rgba(255, 255, 255, 0.05);
    transition: top 0.4s var(--ease-out);
}

.g-header.hidden ~ .g-progress {
    top: 0;
}

.g-progress-bar {
    height: 100%;
    width: 0%;
    background: var(--yellow);
    transition: width 0.1s linear;
}

/* ===== BACKGROUND VIDEO ===== */
.g-bg-video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 0;
    opacity: 0.4;
}

.g-bg-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        to bottom,
        rgba(10, 10, 10, 1) 0%,
        rgba(10, 10, 10, 1) 10%,
        rgba(10, 10, 10, 0.3) 30%,
        rgba(10, 10, 10, 0.3) 70%,
        rgba(10, 10, 10, 1) 90%,
        rgba(10, 10, 10, 1) 100%
    );
    z-index: 1;
}

/* ===== GEO ELEMENTS (Morphing Shape + Clone Spread) ===== */
.g-geo-elements {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 2;
}

.g-geo-circle--hero {
    position: absolute;
    width: 42vw;
    height: 42vw;
    max-width: 490px;
    max-height: 490px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border: 2px solid var(--yellow);
    border-radius: 50%;
    opacity: 0.6;
    animation: gHeroMorph 12s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

.g-geo-spread {
    position: absolute;
    inset: 0;
    pointer-events: none;
    opacity: 0;
    animation: gHeroSpread 8s cubic-bezier(0.4, 0, 0.2, 1) infinite;
    z-index: 1;
}

.g-geo-clone {
    position: absolute;
    width: 42vw;
    height: 42vw;
    max-width: 490px;
    max-height: 490px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border: 1px solid var(--yellow);
    border-radius: 50%;
    animation: gHeroMorph 12s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

@keyframes gHeroMorph {
    0%   { transform: translate(-50%, -50%) scale(1) rotate(0deg);   border-radius: 50%; border-width: 2px; opacity: 0.6; }
    12%  { transform: translate(-50%, -50%) scale(1.05) rotate(15deg); border-radius: 50%; }
    25%  { transform: translate(-50%, -50%) scale(0.85) rotate(45deg); border-radius: 8px; opacity: 0.7; }
    37%  { transform: translate(-50%, -50%) scale(0.85) rotate(90deg); border-radius: 8px; border-width: 3px; }
    50%  { transform: translate(-50%, -50%) scale(1) rotate(135deg);  border-radius: 50%; border-width: 2px; opacity: 0.6; }
    62%  { transform: translate(-50%, -50%) scale(1.05) rotate(195deg); border-radius: 50%; }
    75%  { transform: translate(-50%, -50%) scale(0.85) rotate(225deg); border-radius: 8px; opacity: 0.7; }
    87%  { transform: translate(-50%, -50%) scale(0.85) rotate(315deg); border-radius: 8px; border-width: 3px; }
    100% { transform: translate(-50%, -50%) scale(1) rotate(360deg);  border-radius: 50%; border-width: 2px; opacity: 0.6; }
}

@keyframes gHeroSpread {
    0%, 100% { transform: translateX(0); opacity: 0; }
    5%       { transform: translateX(0); opacity: 0; }
    25%      { transform: translateX(calc(var(--i) * 5vw)); opacity: var(--o); }
    55%      { transform: translateX(calc(var(--i) * 5vw)); opacity: var(--o); }
    75%      { transform: translateX(0); opacity: 0; }
}

/* ===== CHARACTER ANIMATION ===== */
.g-char {
    display: inline-block;
    opacity: 0;
    transform: translateY(20px);
}

@keyframes gCharReveal {
    0%   { opacity: 0; transform: translateY(30px) scale(0.8); filter: blur(4px); }
    60%  { opacity: 1; transform: translateY(-3px) scale(1.02); filter: blur(0); }
    100% { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes gCharFloat {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(calc(sin(var(--i) * 0.8) * -6px)); }
}

.g-chars-animated .g-char {
    animation: gCharReveal 0.7s var(--ease-out) forwards, gCharFloat 4s ease-in-out infinite;
    animation-delay: calc(var(--i) * 0.04s), calc(var(--i) * 0.08s + 0.8s);
}

/* ===== HERO ===== */
.g-hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 120px var(--gap) 80px;
    overflow: hidden;
}

.g-hero-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.g-hero-grain {
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
    opacity: 0.5;
}

.g-hero-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.15;
}

.g-hero-glow--1 {
    width: 600px;
    height: 600px;
    background: var(--yellow);
    top: -200px;
    right: -100px;
    animation: glowFloat 12s ease-in-out infinite;
}

.g-hero-glow--2 {
    width: 400px;
    height: 400px;
    background: var(--blue);
    bottom: -100px;
    left: -100px;
    animation: glowFloat 15s ease-in-out infinite reverse;
}

@keyframes glowFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -20px) scale(1.1); }
    66% { transform: translate(-20px, 30px) scale(0.9); }
}

.g-hero-content {
    position: relative;
    z-index: 10;
}

.g-hero-title-wrap {
    position: relative;
}

.g-hero-eyebrow {
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.15em;
    color: var(--yellow);
    margin-bottom: 24px;
    text-transform: uppercase;
}

.g-hero-title {
    font-family: var(--font-display);
    font-size: clamp(64px, 12vw, 140px);
    font-weight: 900;
    line-height: 0.9;
    letter-spacing: -0.03em;
    color: var(--white);
    margin-bottom: 24px;
}

.g-hero-sub {
    font-size: clamp(16px, 2.5vw, 22px);
    color: var(--gray-4);
    margin-bottom: 32px;
    font-weight: 300;
    letter-spacing: -0.02em;
}

.g-hero-meta {
    display: flex;
    gap: 8px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 80px;
}

.g-tag {
    padding: 6px 14px;
    font-size: 12px;
    font-weight: 500;
    color: var(--gray-4);
    border: 1px solid var(--gray-1);
    border-radius: 100px;
}

/* --- Chapter Preview Cards --- */
.g-hero-chapters {
    position: relative;
    z-index: 10;
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 12px;
    width: 100%;
    max-width: 900px;
    margin-bottom: 60px;
}

.g-chapter-card {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 20px 16px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transition: all 0.4s var(--ease-out);
    cursor: pointer;
}

.g-chapter-card:hover {
    border-color: rgba(255, 214, 0, 0.4);
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-4px);
}

.g-chapter-num {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--yellow);
    letter-spacing: 0.05em;
}

.g-chapter-name {
    font-size: 14px;
    font-weight: 700;
    color: var(--white);
    letter-spacing: 0.02em;
}

.g-chapter-desc {
    font-size: 12px;
    color: var(--gray-3);
    line-height: 1.4;
}

/* --- Resource Grid (Ch.03) --- */
.g-block-desc {
    font-size: 14px;
    color: var(--gray-3);
    margin-bottom: 20px;
    letter-spacing: -0.02em;
}

.g-resource-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.g-resource-card {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 16px 14px;
    border: 1px solid var(--gray-1);
    text-decoration: none;
    transition: border-color 0.3s, background 0.3s;
}

.g-resource-card:hover {
    border-color: var(--yellow);
    background: rgba(255, 214, 0, 0.03);
}

.g-resource-name {
    font-family: var(--font-mono);
    font-size: 13px;
    font-weight: 600;
    color: var(--white);
    letter-spacing: 0.01em;
}

.g-resource-desc {
    font-size: 12px;
    color: var(--gray-3);
    letter-spacing: -0.02em;
    line-height: 1.5;
}

/* --- Scroll Indicator --- */
.g-hero-scroll {
    position: relative;
    z-index: 10;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--gray-3);
    animation: scrollBounce 2s ease-in-out infinite;
}

@keyframes scrollBounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(8px); }
}

/* ===== SECTION COMMON ===== */
.g-section {
    padding: var(--section-gap) 0;
}

.g-section--alt {
    background: var(--black);
}

/* --- Section Hero --- */
.g-section-hero {
    min-height: 70vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 80px var(--gap);
    position: relative;
    overflow: hidden;
}

.g-section-hero-inner {
    position: relative;
    z-index: 10;
}

.g-section-eyebrow {
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.2em;
    color: var(--gray-3);
    margin-bottom: 20px;
    text-transform: uppercase;
}

.g-section-title {
    font-family: var(--font-display);
    font-size: clamp(36px, 7vw, 72px);
    font-weight: 900;
    line-height: 1.1;
    color: var(--white);
    margin-bottom: 20px;
}

.g-section-desc {
    font-size: clamp(16px, 2vw, 20px);
    color: var(--gray-4);
    line-height: 1.6;
    letter-spacing: -0.02em;
}

/* ===== COMPARE ===== */
.g-compare {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 0;
    margin-bottom: var(--section-gap);
}

.g-compare-col {
    padding: 48px 0;
}

.g-compare-before {
    padding-right: 48px;
}

.g-compare-after {
    padding-left: 48px;
}

.g-compare-divider {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 1px;
    background: var(--gray-1);
    position: relative;
}

.g-compare-vs {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 500;
    color: var(--gray-2);
    letter-spacing: 0.1em;
    background: var(--black);
    padding: 8px 0;
}

.g-compare-badge {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.15em;
    color: var(--gray-3);
    margin-bottom: 20px;
    text-transform: uppercase;
}

.g-compare-badge--active {
    color: var(--yellow);
}

.g-compare-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 28px;
}

.g-compare-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.g-compare-list li {
    display: flex;
    gap: 14px;
    align-items: flex-start;
}

.g-compare-list strong {
    display: block;
    font-size: 14px;
    color: var(--white);
    margin-bottom: 4px;
}

.g-compare-list p {
    font-size: 13px;
    color: var(--gray-3);
    line-height: 1.5;
}

.g-icon-x {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    color: var(--red);
    margin-top: 2px;
    opacity: 0.7;
}

.g-icon-check {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    color: var(--yellow);
    margin-top: 2px;
}

/* ===== STATS ===== */
.g-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: var(--section-gap);
}

.g-stat {
    text-align: center;
    padding: 48px 24px;
    background: var(--dark-2);
    border: 1px solid var(--gray-1);
    border-radius: 16px;
}

.g-stat-number {
    font-family: var(--font-display);
    font-size: clamp(48px, 8vw, 72px);
    font-weight: 900;
    color: var(--yellow);
    line-height: 1;
}

.g-stat-unit {
    font-family: var(--font-display);
    font-size: clamp(24px, 4vw, 36px);
    font-weight: 700;
    color: var(--yellow);
}

.g-stat-label {
    font-size: 14px;
    color: var(--gray-3);
    margin-top: 12px;
    line-height: 1.5;
}

.g-stat-source {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.3);
    margin-top: 40px;
    letter-spacing: -0.01em;
}

/* ===== REFERENCE SITES ===== */
.g-subtitle-group {
    margin-bottom: 32px;
}

.g-subtitle {
    font-family: var(--font-display);
    font-size: 28px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 0;
}

.g-subtitle-sub {
    font-family: var(--font-body);
    font-size: 10px;
    font-weight: 400;
    color: var(--gray-3);
    letter-spacing: 0.05em;
    margin-top: 6px;
}

.g-ref-list {
    display: flex;
    flex-direction: column;
    margin-bottom: var(--section-gap);
}

.g-ref-item {
    display: flex;
    align-items: baseline;
    gap: 24px;
    padding: 20px 0;
    border-bottom: 1px solid var(--gray-1);
    text-decoration: none;
    transition: all 0.3s var(--ease-out);
}

.g-ref-item:first-child {
    border-top: 1px solid var(--gray-1);
}

.g-ref-item:hover {
    padding-left: 8px;
}

.g-ref-name {
    font-family: var(--font-display);
    font-size: 18px;
    font-weight: 600;
    color: var(--white);
    min-width: 140px;
    flex-shrink: 0;
    transition: color 0.3s;
}

.g-ref-item:hover .g-ref-name {
    color: var(--yellow);
}

.g-ref-desc {
    font-size: 14px;
    color: var(--gray-3);
    flex: 1;
    line-height: 1.5;
    letter-spacing: -0.02em;
}

.g-ref-arrow {
    font-size: 16px;
    color: var(--gray-2);
    flex-shrink: 0;
    transition: all 0.3s;
}

.g-ref-item:hover .g-ref-arrow {
    color: var(--yellow);
    transform: translate(2px, -2px);
}

/* ===== CONTENT BLOCKS ===== */
.g-content-block {
    margin-bottom: 48px;
}

.g-block-title {
    font-family: var(--font-body);
    font-size: 16px;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 20px;
    letter-spacing: -0.02em;
}

/* --- Reference Card Grid --- */
.g-ref-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
}

.g-ref-card {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 20px 16px;
    border: 1px solid var(--gray-1);
    text-decoration: none;
    transition: all 0.3s var(--ease-out);
}

.g-ref-card:hover {
    border-color: var(--yellow);
    background: var(--yellow-glow);
}

.g-ref-card strong {
    font-size: 14px;
    font-weight: 600;
    color: var(--white);
}

.g-ref-card p {
    font-size: 12px;
    color: var(--gray-3);
    letter-spacing: -0.02em;
}

/* --- Process Steps --- */
.g-process-steps {
    display: flex;
    flex-direction: column;
    gap: 0;
    margin-top: 24px;
}

.g-process-step {
    display: flex;
    gap: 20px;
    padding: 24px 0;
    border-bottom: 1px solid var(--gray-1);
}

.g-process-step:first-child {
    border-top: 1px solid var(--gray-1);
}

.g-process-num {
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 500;
    color: var(--yellow);
    letter-spacing: 0.05em;
    flex-shrink: 0;
    padding-top: 2px;
}

.g-process-content strong {
    display: block;
    font-size: 15px;
    color: var(--white);
    margin-bottom: 8px;
}

.g-process-content p {
    font-size: 14px;
    color: var(--gray-3);
    line-height: 1.6;
    letter-spacing: -0.02em;
}

/* --- Anatomy Rows --- */
.g-anatomy {
    display: flex;
    flex-direction: column;
}

.g-anatomy-row {
    display: grid;
    grid-template-columns: 32px 120px 1fr;
    gap: 16px;
    align-items: baseline;
    padding: 20px 0;
    border-bottom: 1px solid var(--gray-1);
}

.g-anatomy-row:first-child {
    border-top: 1px solid var(--gray-1);
}

.g-anatomy-num {
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 500;
    color: var(--yellow);
    letter-spacing: 0.05em;
}

.g-anatomy-name {
    font-family: var(--font-display);
    font-size: 18px;
    font-weight: 700;
    color: var(--white);
}

.g-anatomy-detail {
    font-size: 14px;
    color: var(--gray-3);
    letter-spacing: -0.02em;
}

/* --- Ref Grid 2-col variant --- */
.g-ref-grid--2col {
    grid-template-columns: repeat(2, 1fr);
}

/* --- Process Flow (horizontal) --- */
.g-process-flow {
    display: flex;
    align-items: center;
    gap: 0;
}

.g-flow-step {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 24px 12px;
    border: 1px solid var(--gray-1);
    text-align: center;
}

.g-flow-num {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--yellow);
    letter-spacing: 0.05em;
}

.g-flow-text {
    font-size: 14px;
    font-weight: 600;
    color: var(--white);
}

.g-flow-sub {
    font-size: 11px;
    color: var(--gray-3);
}

.g-flow-arrow {
    font-size: 14px;
    color: var(--gray-2);
    padding: 0 4px;
    flex-shrink: 0;
}

/* --- Prompt Compare --- */
.g-prompt-compare {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.g-prompt-col {
    padding: 20px;
    border: 1px solid var(--gray-1);
}

.g-prompt-col--bad {
    border-color: rgba(255, 80, 80, 0.2);
}

.g-prompt-col--good {
    border-color: rgba(255, 214, 0, 0.2);
}

.g-prompt-badge {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--red);
    margin-bottom: 16px;
}

.g-prompt-badge--good {
    color: var(--yellow);
}

.g-prompt-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.g-prompt-list li {
    font-size: 13px;
    color: var(--gray-4);
    line-height: 1.6;
    letter-spacing: -0.02em;
    padding-left: 12px;
    border-left: 2px solid var(--gray-1);
}

.g-prompt-col--bad .g-prompt-list li {
    border-left-color: rgba(255, 80, 80, 0.3);
}

.g-prompt-col--good .g-prompt-list li {
    border-left-color: rgba(255, 214, 0, 0.3);
}

/* --- Watch Out List --- */
.g-watchout-list {
    display: flex;
    flex-direction: column;
}

.g-watchout-item {
    display: flex;
    gap: 16px;
    padding: 20px 0;
    border-bottom: 1px solid var(--gray-1);
}

.g-watchout-item:first-child {
    border-top: 1px solid var(--gray-1);
}

.g-watchout-x {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 700;
    color: var(--red);
    border: 1px solid rgba(255, 80, 80, 0.3);
    border-radius: 4px;
}

.g-watchout-content strong {
    display: block;
    font-size: 14px;
    color: var(--white);
    margin-bottom: 4px;
}

.g-watchout-content p {
    font-size: 13px;
    color: var(--gray-3);
    line-height: 1.5;
}

/* --- Git & GitHub Compare --- */
.g-git-compare {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.g-git-col {
    padding: 24px 20px;
    border: 1px solid var(--gray-1);
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.g-git-col--highlight {
    border-color: rgba(255, 214, 0, 0.3);
    background: rgba(255, 214, 0, 0.02);
}

.g-git-badge {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--gray-3);
    width: fit-content;
}

.g-git-badge--yellow {
    color: var(--yellow);
}

.g-git-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--white);
}

.g-git-desc {
    font-size: 13px;
    color: var(--gray-3);
    line-height: 1.5;
}

/* --- Update Loop --- */
.g-update-loop {
    display: flex;
    flex-direction: column;
}

.g-loop-step {
    display: flex;
    gap: 20px;
    padding: 20px 0;
    border-bottom: 1px solid var(--gray-1);
    align-items: center;
}

.g-loop-step:first-child {
    border-top: 1px solid var(--gray-1);
}

.g-loop-num {
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 500;
    color: var(--yellow);
    letter-spacing: 0.05em;
    flex-shrink: 0;
    width: 32px;
    text-align: center;
}

.g-loop-content strong {
    display: block;
    font-size: 14px;
    color: var(--white);
    margin-bottom: 2px;
}

.g-loop-content p {
    font-size: 13px;
    color: var(--gray-3);
    line-height: 1.5;
}

.g-loop-step--infinite {
    border-bottom: none;
}

.g-loop-step--infinite .g-loop-num {
    font-size: 18px;
}

/* ===== CHAPTER HERO ===== */
.g-chapter-hero {
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 120px var(--gap) 80px;
    position: relative;
    overflow: hidden;
}

.g-chapter-hero-inner {
    position: relative;
    z-index: 10;
}

.g-chapter-label {
    font-family: var(--font-mono);
    font-size: 13px;
    letter-spacing: 0.2em;
    color: var(--yellow);
    margin-bottom: 20px;
}

.g-chapter-title {
    font-family: var(--font-display);
    font-size: clamp(64px, 14vw, 160px);
    font-weight: 900;
    line-height: 0.85;
    letter-spacing: -0.04em;
    color: var(--white);
    margin-bottom: 24px;
}

.g-chapter-sub {
    font-size: clamp(16px, 2vw, 20px);
    color: var(--gray-4);
    line-height: 1.6;
    letter-spacing: -0.02em;
}

/* ===== TWO COLUMN LAYOUT ===== */
.g-two-col {
    display: grid;
    grid-template-columns: 1fr 1.4fr;
    gap: 60px;
    padding: var(--section-gap) 0;
}

.g-col-sticky {
    position: relative;
    min-width: 0;
}

.g-col-scroll {
    min-width: 0;
}

.g-sticky-block {
    position: sticky;
    top: 100px;
}

.g-content-title {
    font-family: var(--font-body);
    font-size: 24px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.g-content-text {
    font-size: 15px;
    color: var(--gray-4);
    line-height: 1.8;
    margin-bottom: 16px;
    letter-spacing: -0.01em;
}

.g-content-text strong {
    color: var(--white);
}

/* --- Callout --- */
.g-callout {
    margin-top: 24px;
    padding-left: 16px;
    border-left: 2px solid var(--yellow);
}

.g-callout p {
    font-size: 14px;
    color: var(--gray-4);
    line-height: 1.6;
}

/* ===== CODE BLOCK ===== */
.g-code-block {
    margin-bottom: 32px;
    border: 1px solid var(--gray-1);
    border-radius: 12px;
    overflow: hidden;
    background: var(--dark-2);
}

.g-code-block--small {
    margin-top: 12px;
    margin-bottom: 0;
}

.g-code-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--dark-3);
    border-bottom: 1px solid var(--gray-1);
}

.g-code-dots {
    display: flex;
    gap: 6px;
}

.g-code-dots span {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--gray-1);
}

.g-code-dots span:first-child { background: #ff5f56; }
.g-code-dots span:nth-child(2) { background: #ffbd2e; }
.g-code-dots span:last-child { background: #27c93f; }

.g-code-filename {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--gray-3);
    flex: 1;
}

.g-code-copy {
    padding: 4px 10px;
    font-family: var(--font-body);
    font-size: 11px;
    color: var(--gray-3);
    background: transparent;
    border: 1px solid var(--gray-1);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s;
}

.g-code-copy:hover {
    color: var(--white);
    border-color: var(--gray-3);
}

.g-code {
    padding: 20px;
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.8;
    color: var(--gray-5);
    overflow-x: auto;
    white-space: pre;
}

.g-code-comment {
    color: var(--gray-2);
}

.g-code-inline {
    margin-top: 8px;
}

.g-code-inline code {
    display: block;
    padding: 12px 16px;
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--yellow);
    background: var(--dark-2);
    border: 1px solid var(--gray-1);
    border-radius: 8px;
    line-height: 1.6;
}

/* ===== CHECKLIST ===== */
.g-checklist {
    margin-bottom: 48px;
}

.g-checklist-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 16px;
}

.g-check-item {
    border: 1px solid var(--gray-1);
    border-radius: 10px;
    margin-bottom: 8px;
    overflow: hidden;
    transition: border-color 0.3s;
}

.g-check-item:hover {
    border-color: var(--gray-2);
}

.g-check-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    cursor: pointer;
    user-select: none;
}

.g-checkbox {
    width: 20px;
    height: 20px;
    border: 2px solid var(--gray-2);
    border-radius: 4px;
    flex-shrink: 0;
    transition: all 0.3s;
    position: relative;
}

.g-check-item.checked .g-checkbox {
    background: var(--yellow);
    border-color: var(--yellow);
}

.g-check-item.checked .g-checkbox::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 12px;
    color: var(--black);
    font-weight: 700;
}

.g-check-header strong {
    flex: 1;
    font-size: 15px;
    color: var(--white);
}

.g-expand-icon {
    font-size: 18px;
    color: var(--gray-3);
    transition: transform 0.3s;
    font-weight: 300;
}

.g-check-item.expanded .g-expand-icon {
    transform: rotate(45deg);
}

.g-check-detail {
    padding: 0 20px 0 52px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s var(--ease-out), padding 0.4s;
}

.g-check-item.expanded .g-check-detail {
    max-height: 500px;
    padding: 0 20px 20px 52px;
}

.g-check-detail p {
    font-size: 14px;
    color: var(--gray-4);
    line-height: 1.6;
    margin-bottom: 8px;
}

.g-check-detail ul {
    list-style: none;
    padding: 0;
}

.g-check-detail li {
    font-size: 13px;
    color: var(--gray-4);
    padding: 4px 0;
}

.g-check-detail li::before {
    content: '•';
    color: var(--yellow);
    margin-right: 8px;
}

.g-check-detail code {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--yellow);
    background: var(--dark-2);
    padding: 2px 6px;
    border-radius: 4px;
}

/* --- Skill Tags --- */
.g-skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 8px;
}

.g-skill-tag {
    padding: 6px 14px;
    font-size: 12px;
    font-weight: 500;
    color: var(--white);
    background: var(--dark-3);
    border: 1px solid var(--gray-1);
    border-radius: 100px;
}

/* ===== NEXT CHAPTER ===== */
.g-next-chapter {
    padding: 48px 0;
    border-top: 1px solid var(--gray-1);
    margin-top: 48px;
}

.g-next-label {
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.1em;
    color: var(--gray-3);
    margin-bottom: 12px;
    text-transform: uppercase;
}

.g-next-link {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 24px;
    border: 1px solid var(--gray-1);
    border-radius: 12px;
    transition: all 0.4s var(--ease-out);
}

.g-next-link:hover {
    border-color: var(--yellow);
    background: var(--dark-2);
}

.g-next-num {
    font-family: var(--font-display);
    font-size: 36px;
    font-weight: 900;
    color: var(--yellow);
}

.g-next-name {
    flex: 1;
    font-size: 16px;
    font-weight: 600;
    color: var(--white);
}

.g-next-arrow {
    font-size: 24px;
    color: var(--gray-3);
    transition: transform 0.3s, color 0.3s;
}

.g-next-link:hover .g-next-arrow {
    transform: translateX(4px);
    color: var(--yellow);
}

/* ===== COMING SOON ===== */
.g-section--coming {
    border-top: 1px solid var(--gray-1);
}

/* ===== DOWNLOADS ===== */
.g-download-section {
    padding: 120px 0;
    border-top: 1px solid var(--gray-1);
}

.g-download-explain {
    margin-top: 48px;
}

.g-download-explain-block {
    padding: 32px;
    border: 1px solid var(--gray-1);
}

.g-download-explain-block .g-block-title {
    margin-bottom: 16px;
}

.g-download-explain-text {
    font-size: 15px;
    color: var(--gray-4);
    line-height: 1.8;
    margin-bottom: 24px;
}

.g-download-compare {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 24px;
}

.g-download-compare-col {
    padding: 20px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--gray-1);
}

.g-download-compare-label {
    display: inline-block;
    font-size: 11px;
    font-weight: 600;
    color: var(--yellow);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 12px;
}

.g-download-compare-col p {
    font-size: 13px;
    color: var(--gray-3);
    line-height: 1.8;
}

.g-download-compare-col code {
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 12px;
    color: var(--yellow);
    background: rgba(255, 214, 0, 0.08);
    padding: 1px 5px;
    border-radius: 3px;
}

.g-download-explain-tip {
    font-size: 14px;
    color: var(--gray-3);
    padding-top: 16px;
    border-top: 1px solid var(--gray-1);
}

.g-download-grid {
    display: flex;
    flex-direction: column;
    gap: 48px;
    margin-top: 48px;
}

.g-download-group-label {
    font-size: 11px;
    font-weight: 600;
    color: var(--yellow);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 16px;
}

.g-download-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 12px;
}

.g-download-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px;
    border: 1px solid var(--gray-1);
    text-decoration: none;
    transition: all 0.3s var(--ease-out);
}

.g-download-card:hover {
    border-color: var(--yellow);
    background: var(--yellow-glow);
}

.g-download-icon {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-display);
    font-size: 16px;
    font-weight: 700;
    color: var(--yellow);
    border: 1px solid var(--gray-1);
}

.g-download-card:hover .g-download-icon {
    border-color: var(--yellow);
}

.g-download-info strong {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 4px;
}

.g-download-info p {
    font-size: 12px;
    color: var(--gray-3);
    letter-spacing: -0.02em;
}

/* ===== FOOTER ===== */
.g-footer {
    padding: 80px 0;
    border-top: 1px solid var(--gray-1);
}

.g-footer-inner {
    text-align: center;
}

.g-footer-title {
    font-family: var(--font-display);
    font-size: 20px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 8px;
}

.g-footer-sub {
    font-size: 14px;
    color: var(--gray-3);
    margin-bottom: 24px;
}

.g-footer-links {
    display: flex;
    gap: 24px;
    justify-content: center;
}

.g-footer-links a {
    font-size: 13px;
    color: var(--gray-3);
    transition: color 0.3s;
}

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

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .g-nav {
        display: none;
    }

    .g-hero-chapters {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    /* --- Global --- */
    body {
        word-break: keep-all;
        overflow-wrap: break-word;
    }

    :root {
        --section-gap: clamp(48px, 8vh, 80px);
    }

    /* --- Header --- */
    .g-header {
        height: 56px;
    }

    .g-progress {
        top: 56px;
    }

    .g-header-right {
        display: none;
    }

    /* --- Hero --- */
    .g-hero {
        min-height: auto;
        padding: 100px 20px 60px;
    }

    .g-hero-title {
        font-size: clamp(48px, 14vw, 80px);
    }

    .g-hero-sub {
        font-size: 16px;
        margin-bottom: 24px;
    }

    .g-hero-meta {
        margin-bottom: 48px;
    }

    .g-hero-chapters {
        grid-template-columns: 1fr 1fr;
        gap: 8px;
    }

    .g-hero-chapters .g-chapter-card:last-child {
        grid-column: span 2;
    }

    .g-chapter-card {
        padding: 16px 14px;
    }

    .g-chapter-desc {
        font-size: 11px;
    }

    /* --- Section Hero --- */
    .g-section-hero {
        min-height: 50vh;
        padding: 80px 20px 60px;
    }

    .g-section-desc {
        font-size: 16px;
    }

    /* --- Compare --- */
    .g-compare {
        grid-template-columns: 1fr;
    }

    .g-compare-before,
    .g-compare-after {
        padding: 32px 0;
    }

    .g-compare-before {
        padding-right: 0;
    }

    .g-compare-after {
        padding-left: 0;
    }

    .g-compare-divider {
        width: 100%;
        height: 1px;
    }

    .g-compare-vs {
        padding: 0 12px;
    }

    .g-compare-title {
        font-size: 18px;
    }

    .g-compare-list {
        gap: 20px;
    }

    /* --- Stats --- */
    .g-stats {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .g-stat {
        padding: 32px 20px;
    }

    /* --- Reference List --- */
    .g-ref-item {
        flex-direction: column;
        gap: 8px;
    }

    .g-ref-name {
        min-width: unset;
        font-size: 16px;
    }

    .g-ref-desc {
        font-size: 13px;
    }

    /* --- Ref Grid --- */
    .g-ref-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 8px;
    }

    .g-ref-card {
        padding: 16px 14px;
    }

    /* --- Resource Grid --- */
    .g-resource-grid {
        grid-template-columns: 1fr;
    }

    /* --- Process Flow --- */
    .g-process-flow {
        flex-wrap: wrap;
        gap: 8px;
    }

    .g-flow-arrow {
        display: none;
    }

    .g-flow-step {
        flex: 1 1 calc(50% - 4px);
        min-width: 0;
        padding: 20px 10px;
    }

    .g-flow-text {
        font-size: 13px;
    }

    .g-flow-sub {
        font-size: 10px;
    }

    /* --- Prompt Compare --- */
    .g-prompt-compare {
        grid-template-columns: 1fr;
    }

    /* --- Git Compare --- */
    .g-git-compare {
        grid-template-columns: 1fr;
    }

    /* --- Anatomy --- */
    .g-anatomy-row {
        grid-template-columns: 32px 1fr;
    }

    .g-anatomy-name {
        font-size: 16px;
    }

    .g-anatomy-detail {
        grid-column: 1 / -1;
        padding-left: 48px;
        font-size: 13px;
    }

    /* --- Two Column --- */
    .g-two-col {
        grid-template-columns: 1fr;
        gap: 40px;
        overflow-x: hidden;
    }

    .g-col-sticky {
        position: relative;
    }

    .g-sticky-block {
        position: relative;
        top: auto;
    }

    .g-content-title {
        font-size: 20px;
    }

    .g-content-text {
        font-size: 14px;
    }

    /* --- Chapter Hero --- */
    .g-chapter-hero {
        min-height: 60vh;
        padding: 100px 20px 60px;
    }

    .g-chapter-title {
        font-size: clamp(48px, 16vw, 100px);
    }

    .g-chapter-sub {
        font-size: 16px;
    }

    /* --- Code Block --- */
    .g-code {
        padding: 16px;
        font-size: 12px;
        line-height: 1.7;
    }

    .g-code-filename {
        font-size: 11px;
    }

    /* --- Checklist --- */
    .g-check-header {
        padding: 14px 16px;
    }

    .g-check-header strong {
        font-size: 14px;
    }

    .g-check-detail {
        padding: 0 16px 0 44px;
    }

    .g-check-item.expanded .g-check-detail {
        padding: 0 16px 16px 44px;
    }

    .g-check-detail p {
        font-size: 13px;
    }

    .g-check-detail li {
        font-size: 12px;
    }

    /* --- Watchout --- */
    .g-watchout-content strong {
        font-size: 13px;
    }

    .g-watchout-content p {
        font-size: 12px;
    }

    /* --- Process Steps --- */
    .g-process-content strong {
        font-size: 14px;
    }

    .g-process-content p {
        font-size: 13px;
    }

    /* --- Next Chapter --- */
    .g-next-link {
        padding: 20px 16px;
    }

    .g-next-num {
        font-size: 28px;
    }

    .g-next-name {
        font-size: 14px;
    }

    /* --- Subtitle --- */
    .g-subtitle {
        font-size: 22px;
    }

    /* --- Downloads --- */
    .g-download-section {
        padding: 80px 0;
    }

    .g-download-explain-block {
        padding: 24px;
    }

    .g-download-compare {
        grid-template-columns: 1fr;
    }

    .g-download-cards {
        grid-template-columns: 1fr;
    }

    /* --- Footer --- */
    .g-footer {
        padding: 48px 0;
    }

    /* --- Geo Elements (reduce on mobile) --- */
    .g-geo-circle--hero,
    .g-geo-clone {
        width: 60vw;
        height: 60vw;
    }
}

/* ===== SMALL MOBILE ===== */
@media (max-width: 480px) {
    .g-hero-chapters {
        grid-template-columns: 1fr;
    }

    .g-hero-chapters .g-chapter-card:last-child {
        grid-column: span 1;
    }

    .g-ref-grid {
        grid-template-columns: 1fr;
    }

    .g-ref-grid--2col {
        grid-template-columns: 1fr;
    }

    .g-flow-step {
        flex: 1 1 100%;
    }

    .g-anatomy-detail {
        padding-left: 0;
        margin-top: 4px;
    }

    .g-anatomy-row {
        grid-template-columns: 32px 1fr;
        gap: 8px;
    }

    .g-hero-title {
        font-size: clamp(40px, 14vw, 64px);
    }

    .g-chapter-title {
        font-size: clamp(40px, 14vw, 80px);
    }

    .g-section-title {
        font-size: clamp(28px, 8vw, 48px);
    }

    .g-stat {
        padding: 24px 16px;
    }

    .g-stat-number {
        font-size: 48px;
    }

    .g-check-detail {
        padding: 0 12px 0 36px;
    }

    .g-check-item.expanded .g-check-detail {
        padding: 0 12px 14px 36px;
    }

    .g-code-inline code {
        font-size: 12px;
        padding: 10px 12px;
    }
}

/* ===== REDUCED MOTION ===== */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .reveal {
        opacity: 1;
        transform: none;
    }
}