/* ============================================
   FONT FACE — Professional Google Fonts
   Inter (body), JetBrains Mono (code)
   ============================================ */

/* ============================================
   CSS CUSTOM PROPERTIES
   Palette: #556B2F (Dark Olive Green) + #FFFDD0 (Cream)
   ============================================ */
:root {
    /* Primary palette */
    --color-primary: #556B2F;
    --color-primary-light: #6B8238;
    --color-primary-lighter: #829A4A;
    --color-primary-dark: #3F4F22;
    --color-primary-darker: #2D3817;
    --color-primary-subtle: rgba(85, 107, 47, 0.06);
    --color-primary-soft: rgba(85, 107, 47, 0.12);
    --color-primary-glow: rgba(85, 107, 47, 0.25);
    
    --color-cream: #FFFDD0;
    --color-cream-dark: #F5F2C0;
    --color-cream-darker: #EBE7A8;
    
    /* Backgrounds */
    --color-bg-primary: #FFFDD0;
    --color-bg-secondary: #FDFBE8;
    --color-bg-tertiary: #F8F5D5;
    --color-bg-card: #FFFFFF;
    --color-bg-code: #1A1F0F;
    
    /* Text */
    --color-text-primary: #1A1F0F;
    --color-text-secondary: #4A5538;
    --color-text-muted: #7A8265;
    --color-text-on-dark: #E8ECD5;
    
    /* Borders */
    --color-border-subtle: #EBE7A8;
    --color-border: #D5CF90;
    --color-border-hover: #556B2F;
    
    /* Accent */
    --color-accent-danger: #C0392B;
    --color-accent-warning: #B8860B;
    --color-accent-success: #2E7D32;
    --color-accent-info: #1A5276;
    --color-accent-purple: #6B3FA0;
    --color-accent-unlock: #829A4A;
    --color-accent-unlock-light: #9DB564;
    
    /* Gradients */
    --gradient-hero: linear-gradient(170deg, #FFFDD0 0%, #FDFBE8 30%, #F5F2C0 100%);
    --gradient-card: linear-gradient(160deg, #FFFFFF 0%, #FDFBE8 100%);
    --gradient-accent: linear-gradient(135deg, #556B2F 0%, #6B8238 50%, #3F4F22 100%);
    --gradient-text: linear-gradient(135deg, #556B2F 0%, #3F4F22 100%);
    
    /* Typography */
    --font-primary: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', 'Consolas', monospace;
    
    /* Radii */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(85, 107, 47, 0.08);
    --shadow-card: 0 4px 20px rgba(85, 107, 47, 0.1), 0 0 0 1px rgba(85, 107, 47, 0.04);
    --shadow-card-hover: 0 8px 36px rgba(85, 107, 47, 0.16), 0 0 0 1px rgba(85, 107, 47, 0.12);
    --shadow-glow: 0 0 32px rgba(85, 107, 47, 0.18);
    
    /* Transitions */
    --transition-fast: 160ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 320ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark theme */
[data-theme="dark"] {
    --color-bg-primary: #141A0C;
    --color-bg-secondary: #1A2110;
    --color-bg-tertiary: #202815;
    --color-bg-card: #1C2312;
    --color-bg-code: #0D1107;
    
    --color-text-primary: #FFFDD0;
    --color-text-secondary: #C5C29A;
    --color-text-muted: #8A8760;
    --color-text-on-dark: #E8ECD5;
    
    --color-border-subtle: #2A3318;
    --color-border: #3A4525;
    --color-border-hover: #556B2F;
    
    --gradient-hero: linear-gradient(170deg, #141A0C 0%, #1A2110 30%, #0D1107 100%);
    --gradient-card: linear-gradient(160deg, #1C2312 0%, #1A2110 100%);
    --gradient-text: linear-gradient(135deg, #829A4A 0%, #FFFDD0 100%);
    
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-card: 0 4px 20px rgba(0,0,0,0.4), 0 0 0 1px rgba(85,107,47,0.08);
    --shadow-card-hover: 0 8px 36px rgba(0,0,0,0.5), 0 0 0 1px rgba(85,107,47,0.2);
    --shadow-glow: 0 0 32px rgba(85,107,47,0.25);
}

/* ============================================
   RESET & BASE
   ============================================ */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    transition: background-color var(--transition-smooth), color var(--transition-smooth);
    font-weight: 400;
    letter-spacing: 0.01em;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-primary);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.01em;
}

h1 { font-size: clamp(2.2rem, 5vw, 3.8rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); }
h3 { font-size: clamp(1.1rem, 1.8vw, 1.35rem); }

.gradient-text {
    background: var(--gradient-text);
    font-size: 3.5rem;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.text-emphasis {
    background: linear-gradient(135deg, var(--color-accent-unlock) 0%, var(--color-accent-unlock-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
    font-weight: 500;
}

a:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

code {
    font-family: var(--font-mono);
    font-size: 0.88em;
    background: var(--color-primary-subtle);
    padding: 0.15em 0.4em;
    border-radius: 3px;
    color: var(--color-primary-dark);
}

[data-theme="dark"] code {
    color: var(--color-primary-lighter);
}

/* ============================================
   NAVIGATION
   ============================================ */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 0.8rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all var(--transition-smooth);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--color-border);
}

.nav-menu {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    justify-content: center;
}

nav.scrolled {
    background-color: rgba(255, 253, 208, 0.9);
    box-shadow: 0 2px 20px rgba(85, 107, 47, 0.08);
}

[data-theme="dark"] nav.scrolled {
    background-color: rgba(20, 26, 12, 0.92);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.4);
}

.nav-logo {
    font-family: var(--font-primary);
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--color-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    letter-spacing: -0.02em;
    user-select: none;
}

.nav-logo .logo-mark {
    width: 34px;
    height: 34px;
    border-radius: var(--radius-sm);
    background: var(--gradient-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    color: #FFFDD0;
    font-weight: 700;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.nav-logo:hover {
    text-decoration: none;
}

.nav-logo:hover .logo-mark {
    transform: scale(1.06);
    box-shadow: 0 0 18px var(--color-primary-glow);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 0.1rem;
    align-items: center;
}

.nav-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    padding: 0.4rem 0.85rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    font-size: 0.85rem;
    font-weight: 500;
    position: relative;
}

.nav-links a:hover {
    color: var(--color-primary);
    background-color: var(--color-primary-subtle);
    text-decoration: none;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width var(--transition-fast);
    border-radius: 1px;
}

.nav-links a:hover::after {
    width: 50%;
}

.theme-toggle {
    background: transparent;
    border: 1.5px solid var(--color-border);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    color: var(--color-text-primary);
    flex-shrink: 0;
    position: relative;
    padding: 0;
    margin-left: 1rem;
}

.nav-actions {
    margin-left: auto;
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
    transition: transform 0.4s ease-in-out, opacity 0.3s ease;
    position: absolute;
}

.theme-toggle .sun-icon {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}

.theme-toggle .moon-icon {
    opacity: 0;
    transform: rotate(-180deg) scale(0.5);
}

[data-theme="dark"] .theme-toggle .sun-icon {
    opacity: 0;
    transform: rotate(180deg) scale(0.5);
}

[data-theme="dark"] .theme-toggle .moon-icon {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}

.theme-toggle:hover {
    border-color: var(--color-primary);
    background: var(--color-primary-subtle);
    transform: scale(1.1);
    box-shadow: 0 0 16px var(--color-primary-glow);
}

.theme-toggle:active {
    transform: scale(0.95);
}

.nav-github {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.4rem 0.9rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-weight: 600;
    font-size: 0.85rem;
    transition: all var(--transition-fast);
    background-color: var(--color-bg-tertiary);
    text-decoration: none;
}

.nav-github:hover {
    border-color: var(--color-primary);
    box-shadow: 0 0 16px var(--color-primary-glow);
    transform: translateY(-1px);
    color: var(--color-primary);
    text-decoration: none;
}

.nav-github svg {
    width: 17px;
    height: 17px;
    opacity: 0.75;
}

/* ============================================
   HERO / PRESENTATION
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 7rem 2rem 5rem;
    background: var(--gradient-hero);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: 
        radial-gradient(ellipse at 30% 40%, rgba(85,107,47,0.06) 0%, transparent 55%),
        radial-gradient(ellipse at 70% 60%, rgba(85,107,47,0.04) 0%, transparent 55%);
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, var(--color-border) 50%, transparent 100%);
}

.hero-content {
    max-width: 740px;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.3rem 0.85rem;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 50px;
    font-size: 0.78rem;
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: 2rem;
    animation: fadeInDown 0.55s ease-out;
    letter-spacing: 0.02em;
}

.hero-badge .badge-dot {
    width: 7px;
    height: 7px;
    background: var(--color-accent-success);
    border-radius: 50%;
    animation: pulse-dot 2.5s infinite;
}

.hero h1 {
    margin-bottom: 1.2rem;
    animation: fadeInUp 0.55s ease-out 0.1s both;
}

.hero-tagline {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    margin-bottom: 2.5rem;
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeInUp 0.55s ease-out 0.2s both;
    line-height: 1.75;
}

.hero-actions {
    display: flex;
    gap: 0.8rem;
    flex-wrap: wrap;
    justify-content: center;
    animation: fadeInUp 0.55s ease-out 0.3s both;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.65rem 1.7rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.92rem;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
    font-family: var(--font-primary);
    white-space: nowrap;
    letter-spacing: 0.01em;
}

.btn-primary {
    background: var(--gradient-accent);
    color: #FFFDD0;
    box-shadow: 0 4px 18px rgba(85, 107, 47, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 28px rgba(85, 107, 47, 0.4);
}

.btn-secondary {
    background: transparent;
    border: 1.5px solid var(--color-border);
    color: var(--color-text-primary);
}

.btn-secondary:hover {
    border-color: var(--color-primary);
    background-color: var(--color-primary-subtle);
    transform: translateY(-2px);
}

.btn-install {
    background: var(--color-bg-tertiary);
    border: 1.5px solid var(--color-border);
    color: var(--color-text-primary);
    font-family: var(--font-mono);
    font-size: 0.84rem;
    cursor: pointer;
}

.btn-install:hover {
    border-color: var(--color-primary);
    background-color: var(--color-primary-subtle);
}

/* ============================================
   TAGS SECTION
   ============================================ */
.tags-section {
    padding: 0.8rem 2rem;
    background: #556B2F;
    text-align: center;
    border-bottom: none;
    overflow: hidden;
}

.tags-container {
    max-width: 100%;
    margin: 0 auto;
    display: flex;
    justify-content: flex-start;
    gap: 4.5rem;
    animation: scroll-tags 30s linear infinite;
}

.tags-container:hover {
    animation-play-state: paused;
}

.tag {
    display: inline-flex;
    align-items: center;
    gap: 0;
    padding: 0;
    background: transparent;
    border: none;
    border-radius: 0;
    font-size: 0.95rem;
    color: #FFFDD0;
    font-weight: 300;
    transition: all var(--transition-fast);
    flex-shrink: 0;
    white-space: nowrap;
}

.tag::before {
    display: none;
}

.tag:hover {
    border-color: transparent;
    background: transparent;
    color: #FFFDD0;
    transform: translateY(-1px);
    box-shadow: none;
    opacity: 0.8;
}

[data-theme="dark"] .tags-section {
    background: #556B2F;
}

[data-theme="dark"] .tag {
    background: transparent;
    border: none;
    color: #FFFDD0;
}

[data-theme="dark"] .tag:hover {
    background: transparent;
    border-color: transparent;
}

/* ============================================
   SECTION BASE
   ============================================ */
.section {
    padding: 5.5rem 2rem;
    max-width: 1100px;
    margin: 0 auto;
}

.section-alt {
    background-color: var(--color-bg-secondary);
}

[data-theme="dark"] .section-alt {
    background-color: var(--color-bg-secondary);
}

.section-header {
    text-align: center;
    margin-bottom: 3.5rem;
}

.section-header h2 {
    margin-bottom: 0.7rem;
}

.section-header p {
    color: var(--color-text-secondary);
    font-size: 1.02rem;
    max-width: 540px;
    margin: 0 auto;
    line-height: 1.7;
}

.section-divider {
    width: 50px;
    height: 3px;
    background: var(--color-primary);
    border-radius: 2px;
    margin: 0 auto 1.2rem;
}

/* ============================================
   SPECTRUM
   ============================================ */
.spectrum-container {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 2.5rem 2rem;
    box-shadow: var(--shadow-card);
}

.spectrum-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    font-weight: 600;
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.spectrum-header .label-privacy {
    color: var(--color-accent-danger);
}

.spectrum-header .label-utility {
    color: var(--color-accent-success);
}

.spectrum-bar {
    display: flex;
    height: 50px;
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: 1.5rem;
    box-shadow: 0 3px 16px rgba(0,0,0,0.12);
}

[data-theme="dark"] .spectrum-bar {
    box-shadow: 0 3px 16px rgba(0,0,0,0.4);
}

.spectrum-strategy {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.78rem;
    font-family: var(--font-mono);
    letter-spacing: 0.06em;
    cursor: pointer;
    transition: all var(--transition-smooth);
    position: relative;
    user-select: none;
}

.spectrum-strategy:hover {
    flex: 1.6;
    z-index: 2;
    box-shadow: 0 0 28px currentColor;
    font-size: 0.88rem;
}

.spectrum-strategy.drop       { background: #8B1A1A; color: #F5C6C6; }
.spectrum-strategy.hash       { background: #8B5C1A; color: #F5DCA6; }
.spectrum-strategy.redact     { background: #7A6A1A; color: #F5F0C6; }
.spectrum-strategy.noise      { background: #1A5C2A; color: #A6F5C0; }
.spectrum-strategy.generalize { background: #1A3A6B; color: #A6CCF5; }
.spectrum-strategy.keep       { background: #1A4A2E; color: #A6F5C8; }

.spectrum-info {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.9rem;
    text-align: center;
}

.spectrum-info-item {
    padding: 0.6rem 0.4rem;
    border-radius: var(--radius-sm);
    background: var(--color-bg-tertiary);
    font-size: 0.83rem;
    color: var(--color-text-secondary);
}

.spectrum-info-item strong {
    display: block;
    color: var(--color-text-primary);
    font-size: 0.92rem;
    margin-bottom: 0.15rem;
}

/* ============================================
   STRATEGY CARDS
   ============================================ */
.strategies-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.2rem;
}

.strategy-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.8rem 1.6rem;
    transition: all var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.strategy-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    transition: height var(--transition-smooth), opacity var(--transition-smooth);
    opacity: 0.5;
}

.strategy-card:hover {
    border-color: var(--color-border-hover);
    box-shadow: var(--shadow-card-hover);
    transform: translateY(-3px);
}

.strategy-card:hover::before {
    height: 5px;
    opacity: 1;
}

.strategy-card.drop::before       { background: var(--color-accent-danger); }
.strategy-card.hash::before       { background: var(--color-accent-warning); }
.strategy-card.redact::before     { background: #B8860B; }
.strategy-card.noise::before      { background: var(--color-accent-info); }
.strategy-card.generalize::before { background: var(--color-accent-purple); }
.strategy-card.keep::before       { background: var(--color-accent-success); }

.strategy-card .card-label {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 0.7rem;
    display: inline-block;
    padding: 0.15rem 0.55rem;
    border-radius: 3px;
    background: var(--color-bg-tertiary);
}

.strategy-card.drop .card-label       { color: var(--color-accent-danger); }
.strategy-card.hash .card-label       { color: var(--color-accent-warning); }
.strategy-card.redact .card-label     { color: #B8860B; }
.strategy-card.noise .card-label      { color: var(--color-accent-info); }
.strategy-card.generalize .card-label { color: var(--color-accent-purple); }
.strategy-card.keep .card-label       { color: var(--color-accent-success); }

.strategy-card h3 {
    margin-bottom: 0.4rem;
    font-size: 1.05rem;
}

.strategy-card p {
    color: var(--color-text-secondary);
    font-size: 0.88rem;
    line-height: 1.6;
}

.strategy-card .card-params {
    color: var(--color-primary);
    font-family: var(--font-mono);
    font-size: 0.78rem;
    margin: 0.8rem 0;
    padding: 0.4rem 0.6rem;
    background: var(--color-primary-subtle);
    border-radius: var(--radius-sm);
    display: inline-block;
}

.strategy-card .card-use {
    color: var(--color-text-muted);
    font-size: 0.8rem;
    margin-top: 0.5rem;
    padding-top: 0.7rem;
    border-top: 1px solid var(--color-border-subtle);
    font-style: italic;
}

/* ============================================
   GET STARTED — Engine + CLI
   ============================================ */
.get-started-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

/* Full-bleed section for Get Started */
section#get-started {
    max-width: 100vw;
    width: 100vw;
    margin-left: calc(50% - 50vw);
    margin-right: calc(50% - 50vw);
    padding-left: 2rem;
    padding-right: 2rem;
}

/* Panel inline toggles */
.panel-meta {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
}

.panel-toggle-btn {
    width: 34px;
    height: 34px;
    border-radius: 0 var(--radius-lg) 0 10px;
    border: 1px solid var(--color-border);
    background: var(--color-bg-card);
    color: var(--color-primary-dark);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    font-weight: 700;
    line-height: 1;
    transition: transform var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast), opacity var(--transition-fast);
    position: absolute;
    top: 0;
    z-index: 8;
    opacity: 0;
    pointer-events: none;
    box-shadow: 0 5px 14px rgba(85, 107, 47, 0.18);
}

.panel-toggle-btn:hover {
    border-color: var(--color-border-hover);
    background: var(--color-primary-subtle);
    color: var(--color-primary);
}

.panel-toggle-btn:focus-visible {
    outline: 2px solid var(--color-primary-lighter);
    outline-offset: 2px;
}

.panel-toggle-btn::after {
    content: attr(data-tip);
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: var(--color-bg-code);
    color: var(--color-text-on-dark);
    border: 1px solid var(--color-border);
    border-radius: 7px;
    padding: 0.22rem 0.45rem;
    font-size: 0.72rem;
    font-weight: 500;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.panel-toggle-btn:hover::after,
.panel-toggle-btn:focus-visible::after {
    opacity: 1;
}

.get-started-panel {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 1.5rem;
    width: 100%;
    align-items: start;
}

.get-started-panel-left {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.get-started-panel-right {
    width: 100%;
    min-height: 380px;
}

.panel-card { 
    transition: all var(--transition-smooth);
    position: relative;
}

/* Shrink: left column stacked */
.panel-card.shrink {
    flex: 1;
    opacity: 0.88;
    cursor: pointer;
    background: linear-gradient(160deg, rgba(85,107,47,0.08), rgba(85,107,47,0.02));
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1rem;
    min-height: 100px;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
}

.panel-card.shrink .get-started-card-body { display: none; }

.panel-card.shrink .get-started-card-header {
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    gap: 0.3rem;
    border-bottom: none;
}

.panel-card.shrink .get-started-card-header h3 { font-size: 0.95rem; margin: 0; font-weight: 600; }
.panel-card.shrink .get-started-card-header .card-subtitle { font-size: 0.76rem; display: block; margin: 0; }
.panel-card.shrink .card-summary {
    margin-top: 0.4rem;
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    opacity: 0.9;
    line-height: 1.3;
}

.panel-card.shrink .panel-meta { display: none; }

.panel-card.shrink:hover { 
    box-shadow: 0 8px 24px rgba(85,107,47,0.14); 
    border-color: var(--color-border-hover);
    opacity: 1;
    background: linear-gradient(160deg, rgba(85,107,47,0.12), rgba(85,107,47,0.04));
}

/* Expand: right column full width */
.panel-card.expand { 
    width: 100%;
    opacity: 1;
}

/* Arrow control: show only on expanded panel, pinned to corner */
.engine-card .panel-toggle-btn {
    right: 0;
    border-radius: 0 var(--radius-lg) 0 10px;
}
.cli-card .panel-toggle-btn {
    right: 0;
    left: auto;
    border-radius: 0 var(--radius-lg) 0 10px;
}
.panel-card.expand .panel-toggle-btn { opacity: 1; pointer-events: auto; }

.engine-card .panel-toggle-btn::after,
.cli-card .panel-toggle-btn::after {
    right: calc(100% + 10px);
    transform: translateY(-50%) translateX(4px);
}
.engine-card .panel-toggle-btn:hover::after,
.engine-card .panel-toggle-btn:focus-visible::after,
.cli-card .panel-toggle-btn:hover::after,
.cli-card .panel-toggle-btn:focus-visible::after {
    transform: translateY(-50%) translateX(0);
}

/* Arrow orientation according to expanded panel */
.engine-card.expand .panel-toggle-btn { transform: none; }
.cli-card.expand .panel-toggle-btn { transform: none; }

[data-theme="dark"] .panel-toggle-btn {
    background: var(--color-bg-tertiary);
    color: var(--color-primary-lighter);
    border-color: var(--color-border);
}

[data-theme="dark"] .panel-card.shrink {
    background: linear-gradient(160deg, rgba(130,154,74,0.16), rgba(28,35,18,0.55));
    border-color: var(--color-border);
}

@media (min-width: 601px) and (max-width: 768px) {
    .get-started-panel { 
        grid-template-columns: 1fr;
    }
    .get-started-panel-left {
        flex-direction: row;
        gap: 0.6rem;
    }
    .panel-card.shrink {
        flex: 1;
        min-height: 80px;
        padding: 0.8rem;
    }
    .panel-card.shrink .get-started-card-header h3 { font-size: 0.88rem; }
    .panel-card.shrink .card-summary { font-size: 0.7rem; }
}

.get-started-card {
    /* make Get Started panels flat (not card-like) */
    background: transparent;
    border: none;
    border-radius: 0;
    overflow: visible;
    transition: all var(--transition-smooth);
}

.get-started-card:hover {
    border-color: var(--color-border-hover);
    box-shadow: var(--shadow-card-hover);
}

.get-started-card-header {
    padding: 1rem 1rem;
    border-bottom: 1px solid var(--color-border-subtle);
    background: transparent;
}

[data-theme="dark"] .get-started-card-header {
    background: var(--color-bg-tertiary);
}

.get-started-card-header h3 {
    font-size: 1.1rem;
    margin-bottom: 0.3rem;
    font-family: var(--font-mono);
}

.get-started-card-header .card-subtitle {
    font-size: 0.82rem;
    color: var(--color-text-muted);
}

.get-started-card-body {
    padding: 1.4rem 1.6rem;
}

/* Collapsed header one-line summary */
.card-summary {
    font-size: 0.82rem;
    color: var(--color-text-secondary);
    margin: 6px 0 0 0;
    line-height: 1.2;
}

.get-started-card-body pre {
    background: var(--color-bg-code);
    color: var(--color-text-on-dark);
    padding: 1.2rem;
    border-radius: var(--radius-md);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    line-height: 1.5;
    overflow-x: auto;
    margin: 0;
}

.get-started-card-body pre .key   { color: #B8C898; }
.get-started-card-body pre .str   { color: #E8ECD5; }
.get-started-card-body pre .num   { color: #C5D5A0; }
.get-started-card-body pre .comment { color: #6A7058; font-style: italic; }

/* ============================================
   REFERENCES & CITATIONS
   ============================================ */
.refs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.4rem;
}

.ref-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.8rem 1.6rem;
    transition: all var(--transition-smooth);
}

.ref-card:hover {
    border-color: var(--color-border-hover);
    box-shadow: var(--shadow-card-hover);
}

.ref-card h3 {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-primary);
    margin-bottom: 1rem;
    font-family: var(--font-mono);
}

.ref-card .citation {
    font-size: 0.85rem;
    line-height: 1.6;
    color: var(--color-text-secondary);
    padding: 0.9rem;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
    font-style: italic;
    margin-bottom: 0.7rem;
}

.ref-card .copy-btn {
    font-size: 0.78rem;
    color: var(--color-primary);
    cursor: pointer;
    background: none;
    border: 1px solid var(--color-border);
    padding: 0.3rem 0.8rem;
    border-radius: var(--radius-sm);
    font-family: var(--font-primary);
    transition: all var(--transition-fast);
}

.ref-card .copy-btn:hover {
    background: var(--color-primary-subtle);
    border-color: var(--color-primary);
}

/* ============================================
   FOOTER
   ============================================ */
footer {
    text-align: center;
    padding: 3rem 2rem;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-muted);
    font-size: 0.82rem;
}

footer a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

footer a:hover {
    color: var(--color-primary);
    text-decoration: none;
}

.footer-links {
    display: flex;
    gap: 2rem;
    justify-content: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.footer-location {
    font-size: 0.78rem;
    margin-top: 0.5rem;
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(26px); }
    to   { opacity: 1; transform: translateY(0); }
}

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

@keyframes scroll-tags {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(calc(-50% - 2.25rem));
    }
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50%      { opacity: 0.35; transform: scale(0.7); }
}

.reveal {
    opacity: 0;
    transform: translateY(32px);
    transition: opacity 0.65s ease-out, transform 0.65s ease-out;
}

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

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
    nav {
        padding: 0.6rem 0.9rem;
        flex-wrap: wrap;
        row-gap: 0.5rem;
    }

    .nav-menu {
        position: static;
        transform: none;
        width: 100%;
        order: 3;
        margin-top: 0.45rem;
    }

    .nav-links {
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
        gap: 0.25rem;
    }

    .nav-actions {
        margin-left: 0;
        gap: 0.5rem;
    }
    
    .nav-links a {
        padding: 0.3rem 0.45rem;
        font-size: 0.76rem;
    }

    .theme-toggle {
        margin-left: 0.4rem;
    }
    
    .nav-github span {
        display: none;
    }
    
    .hero {
        padding: 5rem 1rem 3rem;
    }

    .hero-badge {
        font-size: 0.7rem;
        padding: 0.25rem 0.65rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero-tagline {
        font-size: 0.88rem;
    }
    
    .get-started-grid {
        grid-template-columns: 1fr;
    }
    
    .spectrum-bar {
        height: auto;
        flex-wrap: wrap;
        border-radius: var(--radius-md);
    }

    .spectrum-strategy {
        flex: 1 1 33.333%;
        padding: 0.5rem 0.2rem;
        font-size: 0.7rem;
    }

    .spectrum-strategy:hover {
        flex: 1 1 33.333%;
        font-size: 0.7rem;
    }

    .spectrum-info {
        grid-template-columns: 1fr;
    }
    
    .strategies-grid,
    .refs-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }

    .citation {
        word-break: break-word;
        overflow-wrap: break-word;
    }

    .get-started-card-body pre {
        font-size: 0.7rem;
        padding: 0.8rem;
    }

    section#get-started {
        padding-left: 0.8rem;
        padding-right: 0.8rem;
    }

    .get-started-panel-right {
        min-height: 300px;
    }
}

@media (max-width: 600px) {
    .section {
        padding: 3rem 1.2rem;
    }

    .section-header {
        margin-bottom: 2rem;
    }

    .section-header h2 {
        font-size: 1.4rem;
    }

    .spectrum-container {
        padding: 1.5rem 1rem;
    }

    .spectrum-strategy {
        flex: 1 1 50%;
        font-size: 0.68rem;
        padding: 0.45rem 0.15rem;
    }

    .spectrum-strategy:hover {
        flex: 1 1 50%;
        font-size: 0.68rem;
    }

    .strategies-grid {
        gap: 0.8rem;
    }

    .strategy-card {
        padding: 1.2rem 1rem;
    }

    .ref-card {
        padding: 1.2rem 1rem;
    }

    .get-started-panel {
        grid-template-columns: 1fr;
    }

    .get-started-panel-left {
        flex-direction: column;
    }

    .panel-card.shrink {
        width: 100%;
    }

    .get-started-card-body {
        padding: 1rem 0.8rem;
    }

    .get-started-card-body pre {
        font-size: 0.65rem;
        padding: 0.6rem;
    }

    footer {
        padding: 2rem 1rem;
    }

    .footer-links {
        gap: 1rem;
        font-size: 0.78rem;
    }

    .get-started-panel-right {
        min-height: 250px;
    }
}

@media (max-width: 400px) {
    .spectrum-strategy {
        flex: 1 1 100%;
        font-size: 0.75rem;
        padding: 0.5rem 0.2rem;
    }

    .spectrum-strategy:hover {
        flex: 1 1 100%;
        font-size: 0.75rem;
    }

    .nav-links a {
        font-size: 0.7rem;
        padding: 0.25rem 0.35rem;
    }

    .hero-badge {
        font-size: 0.62rem;
        padding: 0.2rem 0.5rem;
    }

    .get-started-panel-right {
        min-height: 200px;
    }
}

@media (max-width: 480px) {
    .get-started-panel-left {
        flex-direction: column;
    }

    .panel-card.shrink {
        width: 100%;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .strategies-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ============================================
   LARGE SCREENS
   ============================================ */
@media (min-width: 1400px) {
    .section {
        max-width: 1200px;
        padding: 5.5rem 3rem;
    }

    .hero-content {
        max-width: 860px;
    }

    .hero h1 {
        font-size: clamp(2.8rem, 4.5vw, 4.5rem);
    }

    .hero-tagline {
        font-size: 1.05rem;
        max-width: 640px;
    }

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

    .spectrum-info {
        grid-template-columns: repeat(3, 1fr);
    }

    .get-started-panel {
        grid-template-columns: 320px 1fr;
    }

    nav {
        padding: 0.9rem 3rem;
    }

    .nav-links {
        gap: 0.3rem;
    }

    .nav-links a {
        font-size: 0.9rem;
        padding: 0.5rem 1rem;
    }
}

@media (min-width: 2000px) {
    .section {
        max-width: 1400px;
        padding: 6rem 4rem;
    }

    .hero-content {
        max-width: 1000px;
    }

    .hero h1 {
        font-size: clamp(3.2rem, 4vw, 5.2rem);
    }

    .hero-tagline {
        font-size: 1.15rem;
        max-width: 720px;
    }

    h2 {
        font-size: clamp(1.8rem, 2.5vw, 2.6rem);
    }

    .strategies-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 1.6rem;
    }

    .strategy-card {
        padding: 2.2rem 2rem;
    }

    .get-started-panel {
        grid-template-columns: 360px 1fr;
    }

    nav {
        padding: 1rem 4rem;
    }

    .nav-logo {
        font-size: 1.5rem;
    }

    .nav-links a {
        font-size: 0.95rem;
        padding: 0.55rem 1.1rem;
    }

    .refs-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .spectrum-container {
        padding: 3rem 2.5rem;
    }
}