/* Base Variables (Light Theme by default) */
:root {
    --bg-color: #f8fafc;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --nav-bg: rgba(248, 250, 252, 0.8);
    --card-bg: #ffffff;
    --card-border: #e2e8f0;
    
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    
    --marquee-text: rgba(15, 23, 42, 0.05);
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    
    /* Feature Card Colors (Light) */
    --c-blue-light: #dbeafe;
    --c-blue: #3b82f6;
    --c-pink-light: #fce7f3;
    --c-pink: #ec4899;
    --c-green-light: #dcfce7;
    --c-green: #22c55e;
    --c-yellow-light: #fef9c3;
    --c-yellow: #eab308;
    --c-purple-light: #f3e8ff;
    --c-purple: #a855f7;
    --c-orange-light: #ffedd5;
    --c-orange: #f97316;
    
    /* Bento Colors (Light) */
    --b-cyan: #cffafe;
    --b-fuchsia: #fae8ff;
    --b-emerald: #d1fae5;
    
    --terminal-bg: #ffffff;
    --terminal-header: #f1f5f9;
    --terminal-border: #cbd5e1;
    --terminal-text: #334155;
    --terminal-prompt: #3b82f6;
    --terminal-success: #16a34a;
}

/* Dark Theme Variables */
[data-theme="dark"] {
    --bg-color: #020617;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --nav-bg: rgba(2, 6, 23, 0.8);
    --card-bg: #0f172a;
    --card-border: #1e293b;
    
    --primary-color: #3b82f6;
    --primary-hover: #60a5fa;
    
    --marquee-text: rgba(248, 250, 252, 0.03);
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.5);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.5), 0 2px 4px -2px rgb(0 0 0 / 0.5);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.5), 0 4px 6px -4px rgb(0 0 0 / 0.5);
    
    /* Feature Card Colors (Dark) */
    --c-blue-light: rgba(59, 130, 246, 0.15);
    --c-blue: #60a5fa;
    --c-pink-light: rgba(236, 72, 153, 0.15);
    --c-pink: #f472b6;
    --c-green-light: rgba(34, 197, 94, 0.15);
    --c-green: #4ade80;
    --c-yellow-light: rgba(234, 179, 8, 0.15);
    --c-yellow: #fde047;
    --c-purple-light: rgba(168, 85, 247, 0.15);
    --c-purple: #c084fc;
    --c-orange-light: rgba(249, 115, 22, 0.15);
    --c-orange: #fb923c;
    
    /* Bento Colors (Dark) */
    --b-cyan: rgba(6, 182, 212, 0.15);
    --b-fuchsia: rgba(217, 70, 239, 0.15);
    --b-emerald: rgba(16, 185, 129, 0.15);
    
    --terminal-bg: #0f172a;
    --terminal-header: #1e293b;
    --terminal-border: #334155;
    --terminal-text: #e2e8f0;
    --terminal-prompt: #60a5fa;
    --terminal-success: #4ade80;
}

/* System Theme prefers-color-scheme */
@media (prefers-color-scheme: dark) {
    [data-theme="system"] {
        --bg-color: #020617;
        --text-primary: #f8fafc;
        --text-secondary: #cbd5e1;
        --text-muted: #94a3b8;
        --nav-bg: rgba(2, 6, 23, 0.8);
        --card-bg: #0f172a;
        --card-border: #1e293b;
        --primary-color: #3b82f6;
        --primary-hover: #60a5fa;
        --marquee-text: rgba(248, 250, 252, 0.03);
        
        --c-blue-light: rgba(59, 130, 246, 0.15); --c-blue: #60a5fa;
        --c-pink-light: rgba(236, 72, 153, 0.15); --c-pink: #f472b6;
        --c-green-light: rgba(34, 197, 94, 0.15); --c-green: #4ade80;
        --c-yellow-light: rgba(234, 179, 8, 0.15); --c-yellow: #fde047;
        --c-purple-light: rgba(168, 85, 247, 0.15); --c-purple: #c084fc;
        --c-orange-light: rgba(249, 115, 22, 0.15); --c-orange: #fb923c;
        
        --b-cyan: rgba(6, 182, 212, 0.15);
        --b-fuchsia: rgba(217, 70, 239, 0.15);
        --b-emerald: rgba(16, 185, 129, 0.15);
        
        --terminal-bg: #0f172a;
        --terminal-header: #1e293b;
        --terminal-border: #334155;
        --terminal-text: #e2e8f0;
        --terminal-prompt: #60a5fa;
        --terminal-success: #4ade80;
    }
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px; /* Accounts for the fixed navbar */
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
    
    /* Disable Text Selection */
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

h1, h2, h3, h4, .logo-text, .terminal-title {
    font-family: 'Outfit', sans-serif;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Grid Background Pattern */
.grid-bg {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    z-index: -1;
    background-image: 
        linear-gradient(to right, rgba(128, 128, 128, 0.1) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(128, 128, 128, 0.1) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: linear-gradient(to bottom, rgba(0,0,0,1) 0%, rgba(0,0,0,0) 100%);
    -webkit-mask-image: linear-gradient(to bottom, rgba(0,0,0,1) 0%, rgba(0,0,0,0) 100%);
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: 80px;
    background: var(--nav-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--card-border);
    z-index: 1000;
    display: flex;
    align-items: center;
}

.nav-content {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    cursor: pointer;
}

.logo-emoji { transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275); }
.logo:hover .logo-emoji { transform: rotate(15deg) scale(1.2); }

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-links a:not(.btn) {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.2s ease;
}

.nav-links a:not(.btn):hover {
    color: var(--text-primary);
}

/* Theme Toggle */
.theme-switch-wrapper {
    position: relative;
}

.theme-toggle {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.theme-toggle:hover {
    background-color: var(--card-border);
    color: var(--text-primary);
}

.theme-toggle svg { display: none; }
html[data-theme="light"] .sun-icon { display: block; }
html[data-theme="dark"] .moon-icon { display: block; }
html[data-theme="system"] .system-icon { display: block; }

@media (prefers-color-scheme: dark) {
    html[data-theme="system"] .system-icon { display: block; }
}

.theme-menu {
    position: absolute;
    top: 120%;
    right: 0;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 0.5rem;
    padding: 0.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.2s ease;
    min-width: 120px;
}

.theme-menu.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.theme-menu button {
    background: none;
    border: none;
    padding: 0.5rem 1rem;
    text-align: left;
    border-radius: 0.25rem;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.9rem;
    font-family: inherit;
    transition: all 0.2s;
}

.theme-menu button:hover {
    background: var(--card-border);
    color: var(--text-primary);
}

.theme-menu button.active {
    background: var(--primary-color);
    color: white;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.6rem 1.25rem;
    border-radius: 0.5rem;
    font-weight: 600;
    text-decoration: none;
    transition: background 0.3s, box-shadow 0.3s, color 0.3s, transform 0.1s ease-out;
    cursor: pointer;
    border: none;
    position: relative;
    z-index: 20;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 4px 14px 0 rgba(59, 130, 246, 0.39);
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px 0 rgba(59, 130, 246, 0.39);
}

.btn-secondary {
    background: var(--card-bg);
    color: var(--text-primary);
    border: 1px solid var(--card-border);
}

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

.btn-icon {
    padding: 0.5rem;
    border-radius: 50%;
    color: var(--text-secondary);
}

.btn-icon:hover {
    background: var(--card-border);
    color: var(--text-primary);
    transform: rotate(10deg);
}

/* Utilities */
.mt-12 { margin-top: 3rem; }
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }

/* Hero Section */
.hero {
    position: relative;
    padding-top: 140px;
    padding-bottom: 80px;
    min-height: 90vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.marquee-background {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 150vw;
    z-index: -1;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    pointer-events: none;
}

.marquee-text {
    display: flex;
    white-space: nowrap;
    font-size: 3rem;
    font-weight: 800;
    color: var(--marquee-text);
    text-transform: uppercase;
    font-family: 'Outfit', sans-serif;
}

.marquee-text span {
    padding: 0 1rem;
}

.marquee-left {
    animation: marquee-left 60s linear infinite;
}

.marquee-right {
    animation: marquee-right 60s linear infinite;
    align-self: flex-end;
}

@keyframes marquee-left {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}
@keyframes marquee-right {
    0% { transform: translateX(-50%); }
    100% { transform: translateX(0); }
}

.hero-content {
    text-align: center;
    max-width: 800px;
    position: relative;
    z-index: 10;
}

.hero-intro {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.hero-title {
    font-size: clamp(3rem, 8vw, 5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
}

.hero-highlight {
    background: linear-gradient(135deg, #3b82f6, #8b5cf6, #ec4899);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-size: 200% auto;
    animation: gradientFlow 5s ease infinite;
}

@keyframes gradientFlow {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* Terminal Mockup */
.terminal-container {
    perspective: 1000px;
    width: 100%;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.terminal-mockup {
    background: var(--terminal-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--terminal-border);
    text-align: left;
    font-family: 'ui-monospace', 'SFMono-Regular', Menlo, Monaco, Consolas, monospace;
    transform: rotateX(5deg);
    transition: transform 0.5s ease;
    cursor: grab;
}

.terminal-mockup:active {
    cursor: grabbing;
}

.terminal-container:hover .terminal-mockup {
    transform: rotateX(0deg) translateY(-5px);
}

.terminal-header {
    background: var(--terminal-header);
    padding: 0.75rem 1rem;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--terminal-border);
    position: relative;
}

.terminal-dots {
    display: flex;
    gap: 0.5rem;
}

.dot {
    width: 12px; height: 12px;
    border-radius: 50%;
}
.dot-red { background: #ef4444; }
.dot-yellow { background: #eab308; }
.dot-green { background: #22c55e; }

.terminal-title {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

.terminal-body {
    padding: 1.5rem;
    font-size: 0.9rem;
    color: var(--terminal-text);
}

.terminal-body p { margin-bottom: 0.5rem; }
.prompt { color: var(--terminal-prompt); margin-right: 0.5rem; }
.output.success { color: var(--terminal-success); }
.output.text-blue { color: var(--terminal-prompt); }

/* Type effect for terminal */
.type-effect {
    overflow: hidden;
    white-space: nowrap;
    border-right: 2px solid var(--terminal-prompt);
    animation: typing 3s steps(40, end), blink-caret .75s step-end infinite;
}

@keyframes typing {
    from { width: 0 }
    to { width: 100% }
}
@keyframes blink-caret {
    from, to { border-color: transparent }
    50% { border-color: var(--terminal-prompt); }
}

/* Sections */
.section {
    padding: 6rem 0;
}

.section-colored {
    background: var(--card-bg);
    border-top: 1px solid var(--card-border);
    border-bottom: 1px solid var(--card-border);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -0.01em;
}

/* Features Grid (Floating Cards & Flip) */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
    padding-top: 2rem;
}

.feature-card-wrapper {
    position: relative;
    padding: 1rem;
    perspective: 1000px;
}

.flip-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    text-align: center;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    transform-style: preserve-3d;
    z-index: 10;
}

.flip-card.is-flipped .flip-card-inner {
    transform: rotateY(180deg);
}

.flip-card-front, .flip-card-back {
    width: 100%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 1.5rem;
    padding: 2rem;
}

.flip-card-back {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    transform: rotateY(180deg);
    justify-content: center;
}

.feature-card-wrapper:hover .flip-card-inner {
    transform: translate(-6px, -6px);
}
.feature-card-wrapper.is-flipped:hover .flip-card-inner {
    transform: translate(-6px, -6px) rotateY(180deg);
}

.feature-icon {
    width: 3.5rem;
    height: 3.5rem;
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin: 0 auto;
}

.bg-blue-light { background-color: var(--card-bg); background-image: linear-gradient(var(--c-blue-light), var(--c-blue-light)); color: var(--c-blue); }
.bg-pink-light { background-color: var(--card-bg); background-image: linear-gradient(var(--c-pink-light), var(--c-pink-light)); color: var(--c-pink); }
.bg-green-light { background-color: var(--card-bg); background-image: linear-gradient(var(--c-green-light), var(--c-green-light)); color: var(--c-green); }
.bg-yellow-light { background-color: var(--card-bg); background-image: linear-gradient(var(--c-yellow-light), var(--c-yellow-light)); color: var(--c-yellow); }
.bg-purple-light { background-color: var(--card-bg); background-image: linear-gradient(var(--c-purple-light), var(--c-purple-light)); color: var(--c-purple); }
.bg-orange-light { background-color: var(--card-bg); background-image: linear-gradient(var(--c-orange-light), var(--c-orange-light)); color: var(--c-orange); }

.bg-cyan-light { background-color: var(--card-bg); background-image: linear-gradient(var(--b-cyan), var(--b-cyan)); }
.bg-fuchsia-light { background-color: var(--card-bg); background-image: linear-gradient(var(--b-fuchsia), var(--b-fuchsia)); }
.bg-emerald-light { background-color: var(--card-bg); background-image: linear-gradient(var(--b-emerald), var(--b-emerald)); }

.flip-card-front h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.flip-card-back p {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
}

/* Card Shadows */
.feature-card-shadow {
    position: absolute;
    top: 1rem; left: 1rem; right: 1rem; bottom: 1rem;
    border-radius: 1.5rem;
    z-index: 5;
    transition: background-color 0.3s ease;
    border: 1px solid var(--card-border);
}

.feature-card-shadow-outer {
    position: absolute;
    top: 1.25rem; left: 1.25rem; right: 0.75rem; bottom: 0.75rem;
    border-radius: 1.5rem;
    background: var(--card-border);
    z-index: 1;
    transition: background-color 0.3s ease;
}

.feature-card-wrapper:hover .shadow-blue { background: var(--c-blue-light); border-color: var(--c-blue); }
.feature-card-wrapper:hover .feature-card-shadow-outer { box-shadow: 0 10px 30px -10px var(--c-blue); }

.feature-card-wrapper:hover .shadow-pink { background: var(--c-pink-light); border-color: var(--c-pink); }
.feature-card-wrapper:hover .shadow-green { background: var(--c-green-light); border-color: var(--c-green); }
.feature-card-wrapper:hover .shadow-yellow { background: var(--c-yellow-light); border-color: var(--c-yellow); }
.feature-card-wrapper:hover .shadow-purple { background: var(--c-purple-light); border-color: var(--c-purple); }
.feature-card-wrapper:hover .shadow-orange { background: var(--c-orange-light); border-color: var(--c-orange); }

/* Accordion (Troubleshooting) */
.accordion-container {
    max-width: 800px;
    margin: 0 auto;
}
.accordion-item {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 1rem;
    margin-bottom: 1rem;
    overflow: hidden;
    transition: all 0.3s ease;
}
.accordion-header {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 1.5rem;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    text-align: left;
    transition: background 0.3s ease;
}
.accordion-header:hover {
    background: var(--nav-bg);
}
.accordion-icon {
    font-size: 1.5rem;
    transition: transform 0.3s ease;
}
.accordion-item.active .accordion-icon {
    transform: rotate(45deg);
}
.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out, padding 0.3s ease;
    padding: 0 1.5rem;
    color: var(--text-secondary);
}
.accordion-item.active .accordion-content {
    padding: 0 1.5rem 1.5rem 1.5rem;
}
.list-disc { list-style-type: disc; margin-left: 1.25rem; }


/* Install Section */
.install-box {
    max-width: 600px;
    margin: 0 auto;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 1.5rem;
    padding: 3rem;
    box-shadow: var(--shadow-md);
}

.code-block {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--bg-color);
    border: 1px solid var(--card-border);
    border-radius: 0.75rem;
    padding: 1rem;
    font-family: 'ui-monospace', monospace;
    font-size: 1rem;
    
    /* Re-enable selection for code blocks */
    -webkit-user-select: text;
    -moz-user-select: text;
    -ms-user-select: text;
    user-select: text;
}

.code-cmd { color: var(--primary-color); }
.code-arg { color: var(--text-primary); }

.copy-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 0.5rem;
    transition: all 0.2s;
}

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

/* Footer */
.footer {
    border-top: 1px solid var(--card-border);
    padding: 2rem 0;
    text-align: center;
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.disclaimer {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Scroll Reveal Animations */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

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

/* Mouse Follower */
.mouse-follower {
    position: fixed;
    top: 0; left: 0;
    width: 0px; height: 0px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.15) 0%, rgba(0,0,0,0) 70%);
    pointer-events: none;
    z-index: 9999;
    transform: translate(-50%, -50%);
    transition: width 0.3s ease, height 0.3s ease, background 0.3s ease;
}

.mouse-follower.active {
    width: 150px;
    height: 150px;
    background: radial-gradient(circle, rgba(236, 72, 153, 0.25) 0%, rgba(0,0,0,0) 70%);
}

[data-theme="dark"] .mouse-follower {
    background: radial-gradient(circle, rgba(96, 165, 250, 0.15) 0%, rgba(0,0,0,0) 70%);
}

[data-theme="dark"] .mouse-follower.active {
    background: radial-gradient(circle, rgba(244, 114, 182, 0.25) 0%, rgba(0,0,0,0) 70%);
}

/* Interactive Text */
.text-interactive span.char {
    display: inline-block;
    transition: transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275), color 0.2s ease;
}
.text-interactive span.char:hover {
    transform: translateY(-10px) scale(1.1) rotate(5deg);
    color: var(--primary-color);
}



/* Mobile Nav */
@media (max-width: 640px) {
    .nav-links { gap: 1rem; }
    .nav-links a:not(.btn-icon) { display: none; }
}