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/* ===================================================
CLAUDE PROMPT ENGINEERING COURSE — STYLE SYSTEM
Art direction: technical/AI, dark-first, clean pro
Fonts: Cabinet Grotesk (display) + Satoshi (body)
=================================================== */
@import url('https://api.fontshare.com/v2/css?f[]=cabinet-grotesk@400,500,600,700,800&f[]=satoshi@300,400,500,700&display=swap');
:root, [data-theme="light"] {
/* Custom palette — deep indigo/amber for AI/technical theme */
--color-bg: #f8f7ff;
--color-surface: #faf9ff;
--color-surface-2: #ffffff;
--color-surface-offset: #f1efff;
--color-surface-dynamic:#e9e7fb;
--color-divider: #dddaf5;
--color-border: #d2cfef;
--color-text: #1a1830;
--color-text-muted: #6b6785;
--color-text-faint: #b2b0cc;
--color-text-inverse: #f8f7ff;
/* Primary: Anthropic Orange-Amber */
--color-primary: #c85c1a;
--color-primary-hover: #a8470f;
--color-primary-active: #8b3a0c;
--color-primary-highlight: #fde8d8;
/* Accent: Deep Indigo */
--color-accent: #4f46e5;
--color-accent-hover: #4338ca;
--color-accent-active: #3730a3;
--color-accent-highlight: #e0e7ff;
--color-success: #16a34a;
--color-success-highlight: #dcfce7;
--color-warning: #d97706;
--color-warning-highlight: #fef3c7;
--color-error: #dc2626;
--color-error-highlight: #fee2e2;
--color-beginner: #16a34a;
--color-intermediate: #d97706;
--color-advanced: #dc2626;
--color-appendix: #7c3aed;
--radius-sm: 0.375rem;
--radius-md: 0.5rem;
--radius-lg: 0.75rem;
--radius-xl: 1rem;
--radius-2xl: 1.5rem;
--radius-full:9999px;
--transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
--shadow-sm: 0 1px 2px rgba(26,24,48,0.06);
--shadow-md: 0 4px 12px rgba(26,24,48,0.09);
--shadow-lg: 0 12px 32px rgba(26,24,48,0.13);
--shadow-xl: 0 24px 64px rgba(26,24,48,0.15);
--content-narrow: 640px;
--content-default: 960px;
--content-wide: 1200px;
--font-display: 'Cabinet Grotesk', 'Helvetica Neue', sans-serif;
--font-body: 'Satoshi', 'Inter', sans-serif;
--font-mono: 'JetBrains Mono', 'Fira Code', monospace;
/* Type scale */
--text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
--text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
--text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
--text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
--text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
--text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
--text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);
--text-hero: clamp(3rem, 0.5rem + 7vw, 7.5rem);
/* Spacing */
--space-1: 0.25rem;
--space-2: 0.5rem;
--space-3: 0.75rem;
--space-4: 1rem;
--space-5: 1.25rem;
--space-6: 1.5rem;
--space-8: 2rem;
--space-10: 2.5rem;
--space-12: 3rem;
--space-16: 4rem;
--space-20: 5rem;
--space-24: 6rem;
--space-32: 8rem;
}
[data-theme="dark"] {
--color-bg: #0e0c1a;
--color-surface: #13111f;
--color-surface-2: #1a1826;
--color-surface-offset: #17152a;
--color-surface-dynamic:#21203a;
--color-divider: #26243a;
--color-border: #302e46;
--color-text: #e4e2f8;
--color-text-muted: #8a88a8;
--color-text-faint: #4e4c68;
--color-text-inverse: #0e0c1a;
--color-primary: #f0894e;
--color-primary-hover: #e8743a;
--color-primary-active: #d95f22;
--color-primary-highlight: #3d2318;
--color-accent: #818cf8;
--color-accent-hover: #6366f1;
--color-accent-active: #4f46e5;
--color-accent-highlight: #1e1b4b;
--color-success: #4ade80;
--color-success-highlight: #14532d;
--color-warning: #fbbf24;
--color-warning-highlight: #451a03;
--color-error: #f87171;
--color-error-highlight: #450a0a;
--color-beginner: #4ade80;
--color-intermediate: #fbbf24;
--color-advanced: #f87171;
--color-appendix: #c084fc;
--shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
--shadow-md: 0 4px 16px rgba(0,0,0,0.4);
--shadow-lg: 0 12px 40px rgba(0,0,0,0.5);
--shadow-xl: 0 24px 80px rgba(0,0,0,0.55);
}
@media (prefers-color-scheme: dark) {
:root:not([data-theme]) {
--color-bg: #0e0c1a;
--color-surface: #13111f;
--color-surface-2: #1a1826;
--color-surface-offset: #17152a;
--color-surface-dynamic:#21203a;
--color-divider: #26243a;
--color-border: #302e46;
--color-text: #e4e2f8;
--color-text-muted: #8a88a8;
--color-text-faint: #4e4c68;
--color-text-inverse: #0e0c1a;
--color-primary: #f0894e;
--color-primary-hover: #e8743a;
--color-primary-active: #d95f22;
--color-primary-highlight: #3d2318;
--color-accent: #818cf8;
--color-accent-hover: #6366f1;
--color-accent-active: #4f46e5;
--color-accent-highlight: #1e1b4b;
--color-success: #4ade80;
--color-success-highlight: #14532d;
--color-warning: #fbbf24;
--color-warning-highlight: #451a03;
--color-error: #f87171;
--color-error-highlight: #450a0a;
--color-beginner: #4ade80;
--color-intermediate: #fbbf24;
--color-advanced: #f87171;
--color-appendix: #c084fc;
--shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
--shadow-md: 0 4px 16px rgba(0,0,0,0.4);
--shadow-lg: 0 12px 40px rgba(0,0,0,0.5);
--shadow-xl: 0 24px 80px rgba(0,0,0,0.55);
}
}
/* ============ BASE ============ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
text-rendering: optimizeLegibility;
scroll-behavior: smooth;
scroll-padding-top: var(--space-16);
}
body {
min-height: 100dvh;
line-height: 1.65;
font-family: var(--font-body);
font-size: var(--text-base);
color: var(--color-text);
background-color: var(--color-bg);
}
img, picture, video, canvas, svg { display: block; max-width: 100%; height: auto; }
ul[role="list"], ol[role="list"] { list-style: none; }
input, button, textarea, select { font: inherit; color: inherit; }
h1,h2,h3,h4,h5,h6 { text-wrap: balance; line-height: 1.2; font-family: var(--font-display); }
p, li, figcaption { text-wrap: pretty; max-width: 72ch; }
::selection { background: oklch(from var(--color-primary) l c h / 0.2); color: var(--color-text); }
:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 3px; border-radius: var(--radius-sm); }
@media (prefers-reduced-motion: reduce) {
*, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}
button { cursor: pointer; background: none; border: none; }
a, button, [role="button"], input, textarea, select {
transition: color var(--transition-interactive), background var(--transition-interactive),
border-color var(--transition-interactive), box-shadow var(--transition-interactive),
opacity var(--transition-interactive);
}
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border-width: 0; }
/* ============ LAYOUT ============ */
.container { width: min(var(--content-wide), 100% - var(--space-8)); margin-inline: auto; }
.container--narrow { width: min(var(--content-narrow), 100% - var(--space-8)); margin-inline: auto; }
.container--default { width: min(var(--content-default), 100% - var(--space-8)); margin-inline: auto; }
/* ============ NAVBAR ============ */
.navbar {
position: sticky;
top: 0;
z-index: 100;
background: var(--color-bg);
border-bottom: 1px solid var(--color-divider);
backdrop-filter: blur(12px);
-webkit-backdrop-filter: blur(12px);
background: color-mix(in oklch, var(--color-bg) 90%, transparent);
}
.navbar__inner {
display: flex;
align-items: center;
justify-content: space-between;
height: 60px;
padding-inline: var(--space-6);
max-width: var(--content-wide);
margin-inline: auto;
}
.navbar__logo {
display: flex;
align-items: center;
gap: var(--space-3);
text-decoration: none;
color: var(--color-text);
}
.navbar__logo-text {
font-family: var(--font-display);
font-size: var(--text-sm);
font-weight: 700;
letter-spacing: -0.01em;
}
.navbar__logo-text span { color: var(--color-primary); }
.navbar__nav {
display: flex;
align-items: center;
gap: var(--space-2);
}
.navbar__link {
font-size: var(--text-sm);
font-weight: 500;
color: var(--color-text-muted);
text-decoration: none;
padding: var(--space-2) var(--space-3);
border-radius: var(--radius-md);
}
.navbar__link:hover { color: var(--color-text); background: var(--color-surface-dynamic); }
.navbar__link.active { color: var(--color-primary); background: var(--color-primary-highlight); }
.navbar__actions { display: flex; align-items: center; gap: var(--space-2); }
/* Theme toggle */
.theme-toggle {
width: 36px; height: 36px;
border-radius: var(--radius-md);
display: flex; align-items: center; justify-content: center;
color: var(--color-text-muted);
border: 1px solid var(--color-border);
}
.theme-toggle:hover { color: var(--color-text); background: var(--color-surface-dynamic); }
/* CTA Button */
.btn {
display: inline-flex;
align-items: center;
gap: var(--space-2);
padding: var(--space-2) var(--space-5);
border-radius: var(--radius-full);
font-size: var(--text-sm);
font-weight: 600;
text-decoration: none;
white-space: nowrap;
border: none;
}
.btn--primary {
background: var(--color-primary);
color: #fff;
}
.btn--primary:hover { background: var(--color-primary-hover); color: #fff; }
.btn--accent {
background: var(--color-accent);
color: #fff;
}
.btn--accent:hover { background: var(--color-accent-hover); color: #fff; }
.btn--ghost {
background: transparent;
color: var(--color-text-muted);
border: 1px solid var(--color-border);
}
.btn--ghost:hover { background: var(--color-surface-dynamic); color: var(--color-text); }
.btn--lg { padding: var(--space-3) var(--space-8); font-size: var(--text-base); }
/* ============ HERO ============ */
.hero {
padding-block: clamp(var(--space-16), 8vw, var(--space-32));
text-align: center;
position: relative;
overflow: hidden;
}
.hero__badge {
display: inline-flex;
align-items: center;
gap: var(--space-2);
padding: var(--space-1) var(--space-4);
border-radius: var(--radius-full);
background: var(--color-primary-highlight);
color: var(--color-primary);
font-size: var(--text-xs);
font-weight: 600;
letter-spacing: 0.04em;
text-transform: uppercase;
margin-bottom: var(--space-6);
}
.hero__title {
font-size: var(--text-3xl);
font-weight: 800;
letter-spacing: -0.03em;
color: var(--color-text);
margin-bottom: var(--space-6);
line-height: 1.1;
}
.hero__title em {
font-style: normal;
color: var(--color-primary);
}
.hero__subtitle {
font-size: var(--text-lg);
color: var(--color-text-muted);
max-width: 620px;
margin-inline: auto;
margin-bottom: var(--space-10);
font-weight: 400;
}
.hero__actions {
display: flex;
flex-wrap: wrap;
align-items: center;
justify-content: center;
gap: var(--space-4);
margin-bottom: var(--space-12);
}
.hero__stats {
display: flex;
justify-content: center;
gap: var(--space-8);
flex-wrap: wrap;
}
.hero__stat { text-align: center; }
.hero__stat-value {
font-size: var(--text-xl);
font-weight: 800;
font-family: var(--font-display);
color: var(--color-text);
letter-spacing: -0.02em;
}
.hero__stat-label {
font-size: var(--text-xs);
color: var(--color-text-muted);
font-weight: 500;
text-transform: uppercase;
letter-spacing: 0.06em;
}
/* Hero glow bg */
.hero::before {
content: '';
position: absolute;
top: -20%;
left: 50%;
transform: translateX(-50%);
width: 80vw;
height: 60vh;
background: radial-gradient(ellipse at center, color-mix(in oklch, var(--color-accent) 12%, transparent) 0%, transparent 70%);
pointer-events: none;
z-index: -1;
}
/* ============ SECTION ============ */
.section { padding-block: clamp(var(--space-12), 6vw, var(--space-24)); }
.section__header { text-align: center; margin-bottom: var(--space-12); }
.section__label {
display: inline-block;
font-size: var(--text-xs);
font-weight: 600;
text-transform: uppercase;
letter-spacing: 0.1em;
color: var(--color-primary);
margin-bottom: var(--space-3);
}
.section__title {
font-size: var(--text-2xl);
font-weight: 800;
letter-spacing: -0.02em;
color: var(--color-text);
}
.section__desc {
font-size: var(--text-base);
color: var(--color-text-muted);
max-width: 560px;
margin-inline: auto;
margin-top: var(--space-4);
}
/* ============ COURSE TRACKS ============ */
.tracks-grid {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
gap: var(--space-6);
margin-bottom: var(--space-8);
}
.track-card {
background: var(--color-surface);
border: 1px solid var(--color-border);
border-radius: var(--radius-xl);
padding: var(--space-6);
position: relative;
overflow: hidden;
transition: transform var(--transition-interactive), box-shadow var(--transition-interactive);
}
.track-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.track-card__level {
display: inline-flex;
align-items: center;
gap: var(--space-2);
padding: var(--space-1) var(--space-3);
border-radius: var(--radius-full);
font-size: var(--text-xs);
font-weight: 700;
text-transform: uppercase;
letter-spacing: 0.06em;
margin-bottom: var(--space-4);
}
.track-card__level--beginner { background: color-mix(in oklch, var(--color-beginner) 15%, transparent); color: var(--color-beginner); }
.track-card__level--intermediate { background: color-mix(in oklch, var(--color-intermediate) 15%, transparent); color: var(--color-intermediate); }
.track-card__level--advanced { background: color-mix(in oklch, var(--color-advanced) 15%, transparent); color: var(--color-advanced); }
.track-card__level--appendix { background: color-mix(in oklch, var(--color-appendix) 15%, transparent); color: var(--color-appendix); }
.track-card__title {
font-size: var(--text-lg);
font-weight: 700;
margin-bottom: var(--space-3);
color: var(--color-text);
}
.track-card__desc {
font-size: var(--text-sm);
color: var(--color-text-muted);
line-height: 1.7;
margin-bottom: var(--space-5);
}
.track-card__lessons { list-style: none; display: flex; flex-direction: column; gap: var(--space-2); }
.track-card__lesson {
display: flex;
align-items: center;
gap: var(--space-3);
font-size: var(--text-sm);
color: var(--color-text-muted);
}
.track-card__lesson a { color: inherit; text-decoration: none; }
.track-card__lesson a:hover { color: var(--color-primary); }
.lesson-dot {
width: 6px; height: 6px;
border-radius: var(--radius-full);
background: var(--color-border);
flex-shrink: 0;
}
/* ============ LESSON CARDS GRID ============ */
.lessons-grid {
display: grid;
grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
gap: var(--space-5);
}
.lesson-card {
background: var(--color-surface);
border: 1px solid var(--color-border);
border-radius: var(--radius-xl);
padding: var(--space-5) var(--space-6);
text-decoration: none;
color: inherit;
display: flex;
flex-direction: column;
gap: var(--space-3);
position: relative;
transition: transform var(--transition-interactive), box-shadow var(--transition-interactive), border-color var(--transition-interactive);
}
.lesson-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); border-color: var(--color-primary); }
.lesson-card__meta {
display: flex;
align-items: center;
justify-content: space-between;
}
.lesson-card__num {
font-size: var(--text-xs);
font-weight: 700;
font-family: var(--font-mono);
color: var(--color-text-faint);
}
.lesson-card__badge {
font-size: var(--text-xs);
font-weight: 600;
padding: 2px var(--space-2);
border-radius: var(--radius-full);
}
.badge--beginner { background: color-mix(in oklch, var(--color-beginner) 15%, transparent); color: var(--color-beginner); }
.badge--intermediate { background: color-mix(in oklch, var(--color-intermediate) 15%, transparent); color: var(--color-intermediate); }
.badge--advanced { background: color-mix(in oklch, var(--color-advanced) 15%, transparent); color: var(--color-advanced); }
.badge--appendix { background: color-mix(in oklch, var(--color-appendix) 15%, transparent); color: var(--color-appendix); }
.lesson-card__title {
font-size: var(--text-base);
font-weight: 700;
color: var(--color-text);
line-height: 1.3;
}
.lesson-card__desc {
font-size: var(--text-sm);
color: var(--color-text-muted);
line-height: 1.6;
flex: 1;
}
.lesson-card__footer {
display: flex;
align-items: center;
gap: var(--space-3);
font-size: var(--text-xs);
color: var(--color-text-faint);
margin-top: var(--space-1);
}
.lesson-card__arrow {
margin-left: auto;
color: var(--color-primary);
opacity: 0;
transform: translateX(-4px);
transition: opacity var(--transition-interactive), transform var(--transition-interactive);
}
.lesson-card:hover .lesson-card__arrow { opacity: 1; transform: translateX(0); }
/* ============ LESSON PAGE ============ */
.lesson-layout {
display: grid;
grid-template-columns: 260px 1fr;
gap: var(--space-10);
align-items: start;
max-width: var(--content-wide);
margin-inline: auto;
padding-inline: var(--space-6);
}
@media (max-width: 860px) {
.lesson-layout { grid-template-columns: 1fr; }
.lesson-sidebar { display: none; }
}
.lesson-sidebar {
position: sticky;
top: 80px;
background: var(--color-surface);
border: 1px solid var(--color-border);
border-radius: var(--radius-xl);
padding: var(--space-5);
}
.sidebar__title {
font-size: var(--text-xs);
font-weight: 700;
text-transform: uppercase;
letter-spacing: 0.08em;
color: var(--color-text-muted);
margin-bottom: var(--space-4);
}
.sidebar__list { list-style: none; display: flex; flex-direction: column; gap: var(--space-1); }
.sidebar__item a {
display: flex;
align-items: center;
gap: var(--space-3);
padding: var(--space-2) var(--space-3);
border-radius: var(--radius-md);
text-decoration: none;
font-size: var(--text-sm);
color: var(--color-text-muted);
}
.sidebar__item a:hover { background: var(--color-surface-dynamic); color: var(--color-text); }
.sidebar__item.active a { background: var(--color-primary-highlight); color: var(--color-primary); font-weight: 600; }
.sidebar__item .num {
font-family: var(--font-mono);
font-size: var(--text-xs);
color: var(--color-text-faint);
min-width: 20px;
}
.lesson-content { min-width: 0; padding-block: var(--space-10); }
.lesson-header { margin-bottom: var(--space-10); padding-bottom: var(--space-8); border-bottom: 1px solid var(--color-divider); }
.lesson-breadcrumb {
display: flex;
align-items: center;
gap: var(--space-2);
font-size: var(--text-xs);
color: var(--color-text-faint);
margin-bottom: var(--space-4);
}
.lesson-breadcrumb a { color: var(--color-text-muted); text-decoration: none; }
.lesson-breadcrumb a:hover { color: var(--color-primary); }
.lesson-header__badge { margin-bottom: var(--space-3); }
.lesson-title {
font-size: var(--text-2xl);
font-weight: 800;
letter-spacing: -0.025em;
margin-bottom: var(--space-4);
color: var(--color-text);
}
.lesson-subtitle {
font-size: var(--text-base);
color: var(--color-text-muted);
max-width: 600px;
line-height: 1.7;
}
.lesson-meta {
display: flex;
flex-wrap: wrap;
gap: var(--space-4);
margin-top: var(--space-5);
font-size: var(--text-xs);
color: var(--color-text-faint);
}
.lesson-meta span { display: flex; align-items: center; gap: var(--space-1); }
/* Lesson body content */
.lesson-body { line-height: 1.75; }
.lesson-body h2 {
font-size: var(--text-xl);
font-weight: 700;
margin-top: var(--space-12);
margin-bottom: var(--space-5);
color: var(--color-text);
letter-spacing: -0.02em;
}
.lesson-body h3 {
font-size: var(--text-lg);
font-weight: 700;
margin-top: var(--space-8);
margin-bottom: var(--space-4);
color: var(--color-text);
}
.lesson-body p {
margin-bottom: var(--space-5);
color: var(--color-text-muted);
font-size: var(--text-base);
}
.lesson-body ul, .lesson-body ol {
margin-bottom: var(--space-6);
padding-left: var(--space-6);
display: flex;
flex-direction: column;
gap: var(--space-2);
}
.lesson-body li { color: var(--color-text-muted); font-size: var(--text-base); }
.lesson-body strong { color: var(--color-text); font-weight: 600; }
/* Code blocks */
.code-block {
background: var(--color-surface);
border: 1px solid var(--color-border);
border-radius: var(--radius-lg);
overflow: hidden;
margin-block: var(--space-6);
}
.code-block__header {
display: flex;
align-items: center;
justify-content: space-between;
padding: var(--space-3) var(--space-4);
background: var(--color-surface-offset);
border-bottom: 1px solid var(--color-border);
}
.code-block__label {
font-size: var(--text-xs);
font-weight: 600;
color: var(--color-text-muted);
font-family: var(--font-mono);
text-transform: uppercase;
letter-spacing: 0.06em;
}
.code-block__copy {
font-size: var(--text-xs);
color: var(--color-text-faint);
border: 1px solid var(--color-border);
padding: 2px var(--space-3);
border-radius: var(--radius-sm);
background: var(--color-surface-2);
}
.code-block__copy:hover { color: var(--color-text); background: var(--color-surface-dynamic); }
.code-block pre {
padding: var(--space-5) var(--space-6);
overflow-x: auto;
font-family: var(--font-mono);
font-size: var(--text-sm);
line-height: 1.7;
color: var(--color-text);
}
.code-block code { font-family: var(--font-mono); }
/* Callout boxes */
.callout {
border-radius: var(--radius-lg);
padding: var(--space-5) var(--space-6);
margin-block: var(--space-6);
display: flex;
gap: var(--space-4);
border-left: 3px solid;
}
.callout--tip { background: var(--color-success-highlight); border-color: var(--color-success); }
.callout--note { background: var(--color-accent-highlight); border-color: var(--color-accent); }
.callout--warn { background: var(--color-warning-highlight); border-color: var(--color-warning); }
.callout--error { background: var(--color-error-highlight); border-color: var(--color-error); }
.callout__icon { font-size: 1.2em; flex-shrink: 0; margin-top: 2px; }
.callout__title { font-weight: 700; font-size: var(--text-sm); color: var(--color-text); margin-bottom: var(--space-1); }
.callout__body { font-size: var(--text-sm); color: var(--color-text-muted); line-height: 1.7; }
/* Comparison table */
.compare-table {
width: 100%;
border-collapse: collapse;
margin-block: var(--space-6);
font-size: var(--text-sm);
}
.compare-table th {
background: var(--color-surface-offset);
padding: var(--space-3) var(--space-4);
text-align: left;
font-weight: 700;
font-size: var(--text-xs);
text-transform: uppercase;
letter-spacing: 0.06em;
color: var(--color-text-muted);
border-bottom: 1px solid var(--color-border);
}
.compare-table td {
padding: var(--space-3) var(--space-4);
border-bottom: 1px solid var(--color-divider);
color: var(--color-text-muted);
vertical-align: top;
}
.compare-table tr:last-child td { border-bottom: none; }
.compare-table tr:hover td { background: var(--color-surface-offset); }
.compare-table .good { color: var(--color-success); font-weight: 600; }
.compare-table .bad { color: var(--color-error); font-weight: 600; }
/* Technique cards */
.technique-grid {
display: grid;
grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
gap: var(--space-4);
margin-block: var(--space-6);
}
.technique-card {
background: var(--color-surface);
border: 1px solid var(--color-border);
border-radius: var(--radius-lg);
padding: var(--space-5);
}
.technique-card__icon { font-size: 1.5em; margin-bottom: var(--space-3); }
.technique-card__title { font-weight: 700; font-size: var(--text-sm); color: var(--color-text); margin-bottom: var(--space-2); }
.technique-card__desc { font-size: var(--text-xs); color: var(--color-text-muted); line-height: 1.6; }
/* Prompt example */
.prompt-example {
margin-block: var(--space-6);
}
.prompt-example__tabs {
display: flex;
gap: var(--space-1);
margin-bottom: 0;
border-bottom: 1px solid var(--color-border);
}
.prompt-example__tab {
padding: var(--space-2) var(--space-4);
font-size: var(--text-sm);
font-weight: 600;
color: var(--color-text-muted);
border-radius: var(--radius-md) var(--radius-md) 0 0;
border: 1px solid transparent;
border-bottom: none;
cursor: pointer;
background: none;
position: relative;
top: 1px;
}
.prompt-example__tab.active {
background: var(--color-surface);
border-color: var(--color-border);
color: var(--color-text);
}
.prompt-panel {
background: var(--color-surface);
border: 1px solid var(--color-border);
border-radius: 0 var(--radius-lg) var(--radius-lg) var(--radius-lg);
padding: var(--space-5) var(--space-6);
font-size: var(--text-sm);
line-height: 1.75;
color: var(--color-text);
font-family: var(--font-mono);
white-space: pre-wrap;
display: none;
}
.prompt-panel.active { display: block; }
.tag-xml { color: var(--color-accent); }
.tag-system { color: var(--color-primary); }
.tag-content { color: var(--color-text); }
/* Lesson nav */
.lesson-nav {
display: flex;
align-items: center;
justify-content: space-between;
margin-top: var(--space-16);
padding-top: var(--space-8);
border-top: 1px solid var(--color-divider);
gap: var(--space-4);
}
.lesson-nav__btn {
display: flex;
align-items: center;
gap: var(--space-3);
text-decoration: none;
padding: var(--space-4) var(--space-5);
border-radius: var(--radius-lg);
border: 1px solid var(--color-border);
background: var(--color-surface);
color: var(--color-text-muted);
max-width: 280px;
font-size: var(--text-sm);
}
.lesson-nav__btn:hover { border-color: var(--color-primary); color: var(--color-primary); background: var(--color-primary-highlight); }
.lesson-nav__label { font-size: var(--text-xs); color: var(--color-text-faint); margin-bottom: 2px; }
.lesson-nav__title { font-weight: 600; color: var(--color-text); }
.lesson-nav__btn:hover .lesson-nav__title { color: var(--color-primary); }
/* ============ PLAYGROUND ============ */
.playground {
background: var(--color-surface);
border: 1px solid var(--color-border);
border-radius: var(--radius-2xl);
overflow: hidden;
box-shadow: var(--shadow-xl);
}
.playground__header {
display: flex;
align-items: center;
justify-content: space-between;
padding: var(--space-4) var(--space-6);
background: var(--color-surface-offset);
border-bottom: 1px solid var(--color-border);
}
.playground__title { font-size: var(--text-sm); font-weight: 700; font-family: var(--font-display); }
.playground__dots { display: flex; gap: var(--space-2); }
.playground__dot { width: 12px; height: 12px; border-radius: var(--radius-full); }
.playground__dot:nth-child(1) { background: #ef4444; }
.playground__dot:nth-child(2) { background: #f59e0b; }
.playground__dot:nth-child(3) { background: #22c55e; }
.playground__body { display: grid; grid-template-columns: 1fr 1fr; min-height: 400px; }
@media (max-width: 768px) { .playground__body { grid-template-columns: 1fr; } }
.playground__pane { padding: var(--space-6); }
.playground__pane + .playground__pane { border-left: 1px solid var(--color-border); }
@media (max-width: 768px) { .playground__pane + .playground__pane { border-left: none; border-top: 1px solid var(--color-border); } }
.playground__pane-title {
font-size: var(--text-xs);
font-weight: 700;
text-transform: uppercase;
letter-spacing: 0.08em;
color: var(--color-text-muted);
margin-bottom: var(--space-3);
}
.playground__textarea {
width: 100%;
min-height: 200px;
resize: vertical;
background: var(--color-bg);
border: 1px solid var(--color-border);
border-radius: var(--radius-md);
padding: var(--space-4);
font-family: var(--font-mono);
font-size: var(--text-sm);
color: var(--color-text);
outline: none;
line-height: 1.7;
}
.playground__textarea:focus { border-color: var(--color-accent); box-shadow: 0 0 0 3px color-mix(in oklch, var(--color-accent) 20%, transparent); }
.playground__footer {
padding: var(--space-4) var(--space-6);
background: var(--color-surface-offset);
border-top: 1px solid var(--color-border);
display: flex;
align-items: center;
justify-content: space-between;
}
.playground__response {
background: var(--color-bg);
border: 1px solid var(--color-border);
border-radius: var(--radius-md);
padding: var(--space-4);
font-size: var(--text-sm);
color: var(--color-text-muted);
line-height: 1.75;
min-height: 200px;
white-space: pre-wrap;
}
/* ============ PROGRESS BAR ============ */
.progress-bar {
width: 100%;
height: 4px;
background: var(--color-surface-dynamic);
border-radius: var(--radius-full);
overflow: hidden;
margin-bottom: var(--space-6);
}
.progress-bar__fill {
height: 100%;
background: linear-gradient(90deg, var(--color-accent), var(--color-primary));
border-radius: var(--radius-full);
transition: width 0.5s ease;
}
/* ============ FEATURE LIST ============ */
.feature-grid {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
gap: var(--space-5);
}
.feature-item {
display: flex;
gap: var(--space-4);
padding: var(--space-5);
background: var(--color-surface);
border: 1px solid var(--color-border);
border-radius: var(--radius-lg);
}
.feature-icon {
width: 40px; height: 40px;
border-radius: var(--radius-md);
background: var(--color-primary-highlight);
color: var(--color-primary);
display: flex; align-items: center; justify-content: center;
font-size: 1.1em;
flex-shrink: 0;
}
.feature-text__title { font-weight: 700; font-size: var(--text-sm); margin-bottom: var(--space-1); color: var(--color-text); }
.feature-text__desc { font-size: var(--text-xs); color: var(--color-text-muted); line-height: 1.6; }
/* ============ FOOTER ============ */
.footer {
border-top: 1px solid var(--color-divider);
padding-block: var(--space-10);
background: var(--color-surface);
}
.footer__inner {
display: flex;
align-items: center;
justify-content: space-between;
flex-wrap: wrap;
gap: var(--space-4);
}
.footer__brand {
display: flex;
align-items: center;
gap: var(--space-3);
font-size: var(--text-sm);
color: var(--color-text-muted);
}
.footer__links {
display: flex;
gap: var(--space-6);
}
.footer__links a {
font-size: var(--text-sm);
color: var(--color-text-faint);
text-decoration: none;
}
.footer__links a:hover { color: var(--color-primary); }
.footer__credit {
font-size: var(--text-xs);
color: var(--color-text-faint);
text-align: center;
width: 100%;
margin-top: var(--space-4);
}
.footer__credit a { color: var(--color-primary); text-decoration: none; }
.footer__credit a:hover { text-decoration: underline; }
/* ============ MOBILE MENU ============ */
.hamburger { display: none; flex-direction: column; gap: 5px; padding: var(--space-2); }
.hamburger span { display: block; width: 22px; height: 2px; background: var(--color-text); border-radius: var(--radius-full); transition: all 0.3s; }
.mobile-menu {
display: none;
flex-direction: column;
background: var(--color-surface);
border-bottom: 1px solid var(--color-divider);
padding: var(--space-4) var(--space-6);
gap: var(--space-1);
}
.mobile-menu.open { display: flex; }
.mobile-menu a { padding: var(--space-3); border-radius: var(--radius-md); text-decoration: none; font-size: var(--text-sm); color: var(--color-text-muted); font-weight: 500; }
.mobile-menu a:hover { background: var(--color-surface-dynamic); color: var(--color-text); }
@media (max-width: 768px) {
.navbar__nav { display: none; }
.hamburger { display: flex; }
}
/* ============ ANIMATIONS ============ */
@keyframes fadeInUp {
from { opacity: 0; transform: translateY(20px); }
to { opacity: 1; transform: translateY(0); }
}
.animate-in { animation: fadeInUp 0.5s ease forwards; }
.animate-in-delay-1 { animation-delay: 0.1s; opacity: 0; animation-fill-mode: forwards; }
.animate-in-delay-2 { animation-delay: 0.2s; opacity: 0; animation-fill-mode: forwards; }
.animate-in-delay-3 { animation-delay: 0.3s; opacity: 0; animation-fill-mode: forwards; }
/* Divider with text */
.divider-label {
display: flex;
align-items: center;
gap: var(--space-4);
margin-block: var(--space-8);
}
.divider-label::before, .divider-label::after {
content: '';
flex: 1;
height: 1px;
background: var(--color-divider);
}
.divider-label span { font-size: var(--text-xs); font-weight: 600; color: var(--color-text-faint); text-transform: uppercase; letter-spacing: 0.08em; }
/* Steps */
.steps { counter-reset: step; display: flex; flex-direction: column; gap: var(--space-6); margin-block: var(--space-6); }
.step { display: flex; gap: var(--space-5); counter-increment: step; }
.step__num {
width: 32px; height: 32px; min-width: 32px;
border-radius: var(--radius-full);
background: var(--color-accent-highlight);
color: var(--color-accent);
font-size: var(--text-sm);
font-weight: 700;
display: flex; align-items: center; justify-content: center;
font-family: var(--font-mono);
}
.step__content { padding-top: var(--space-1); }
.step__title { font-weight: 700; font-size: var(--text-sm); color: var(--color-text); margin-bottom: var(--space-1); }
.step__desc { font-size: var(--text-sm); color: var(--color-text-muted); line-height: 1.7; }