/* === Design Tokens === */
:root {
    --color-bg: #0D0D0D; --color-surface: #1A1A1A; --color-text: #E8E4DF;
    --color-text-muted: #8A8580; --color-accent: #D4A853; --color-accent-hover: #E0B86A;
    --color-code: #7B9EB8; --color-border: #2A2A2A; --color-border-hover: #3A3A3A;
    --color-success: #6BA368;
    --font-heading: 'Space Grotesk', system-ui, sans-serif;
    --font-body: 'Source Serif 4', Georgia, 'Times New Roman', serif;
    --font-mono: 'JetBrains Mono', ui-monospace, 'Cascadia Code', monospace;
    --space-xs: 0.25rem; --space-sm: 0.5rem; --space-md: 1rem;
    --space-lg: 1.5rem; --space-xl: 2.5rem; --space-2xl: 4rem;
    --space-3xl: 6rem; --space-section: 4rem;
    --radius-sm: 4px; --radius-md: 6px; --radius-lg: 8px;
    --transition-fast: 150ms ease; --transition: 200ms ease;
    --max-width: 896px; --max-width-wide: 1140px;

    --color-queue: #7B9EB8;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
}

img { max-width: 100%; display: block; }
a { color: var(--color-accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-accent-hover); }

.container {
    max-width: var(--max-width-wide);
    margin: 0 auto;
    padding: 0 clamp(1rem, 4vw, 2rem);
}

/* === Header === */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(13, 13, 13, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
}

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

.logo-icon {
    font-size: 1.4rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.nav-links a {
    color: var(--color-text-muted);
    font-family: var(--font-heading);
    font-size: 0.9rem;
    font-weight: 500;
    transition: color var(--transition);
}

.nav-links a:hover {
    color: var(--color-text);
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.mobile-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: var(--transition);
}

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    transition: filter var(--transition);
    cursor: pointer;
    border: none;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
}

.btn-lg {
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
}

.btn-primary {
    background: var(--color-accent);
    color: var(--color-bg);
}

.btn-primary:hover {
    color: var(--color-bg);
    filter: brightness(1.25);
}

.btn-ghost {
    background: transparent;
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-ghost:hover {
    border-color: var(--color-border-hover);
    color: var(--color-text);
    filter: brightness(1.25);
}

/* === Hero === */
.hero {
    padding: clamp(8rem, 16vh, 12rem) 0 var(--space-section);
    text-align: center;
}

.hero-badge {
    display: inline-block;
    padding: 0.35rem 1rem;
    background: rgba(212, 168, 83, 0.1);
    color: var(--color-accent);
    border: 1px solid rgba(212, 168, 83, 0.2);
    border-radius: 999px;
    font-family: var(--font-heading);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.03em;
    margin-bottom: var(--space-lg);
}

.hero h1 {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 700;
    line-height: 1.1;
    color: var(--color-text);
    margin-bottom: var(--space-lg);
}

.hero-sub {
    font-family: var(--font-body);
    font-size: clamp(1.05rem, 2vw, 1.2rem);
    color: var(--color-text-muted);
    max-width: 640px;
    margin: 0 auto var(--space-xl);
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: clamp(3rem, 6vw, 5rem);
}

/* Terminal mock */
.hero-terminal {
    max-width: 680px;
    margin: 0 auto;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    text-align: left;
}

.terminal-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
}

.terminal-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.terminal-dot.red { background: #ff5f57; }
.terminal-dot.yellow { background: #febc2e; }
.terminal-dot.green { background: #28c840; }

.terminal-title {
    margin-left: auto;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.terminal-body {
    padding: 1.25rem 1.5rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.8;
}

.terminal-line {
    white-space: pre-wrap;
}

.t-prompt {
    color: var(--color-success);
    margin-right: 0.5rem;
}

.t-dim { color: var(--color-text-muted); }

.t-status {
    display: inline-block;
    padding: 0.1rem 0.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 700;
    margin-right: 0.5rem;
    letter-spacing: 0.02em;
}

.t-stock { background: rgba(107, 163, 104, 0.15); color: var(--color-success); }
.t-queue { background: rgba(123, 158, 184, 0.15); color: var(--color-queue); }
.t-alert { background: rgba(212, 168, 83, 0.15); color: var(--color-accent); }

.t-blink {
    animation: blink 1s step-end infinite;
    color: var(--color-accent);
}

@keyframes blink {
    50% { opacity: 0; }
}

/* === Problem === */
.problem {
    padding: var(--space-section) 0;
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

.problem-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-2xl);
    transition: border-color var(--transition);
}

.problem-card:hover {
    border-color: var(--color-border-hover);
}

.problem-icon {
    font-size: 2rem;
    margin-bottom: var(--space-md);
}

.problem-card h3 {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    color: var(--color-text);
    margin-bottom: var(--space-sm);
}

.problem-card p {
    color: var(--color-text-muted);
    font-size: 0.92rem;
    line-height: 1.6;
}

/* === How It Works === */
.how-it-works {
    padding: var(--space-section) 0;
}

h2 {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    color: var(--color-text);
    text-align: center;
    margin-bottom: 0.75rem;
}

.section-sub {
    text-align: center;
    color: var(--color-text-muted);
    font-family: var(--font-body);
    font-size: 1.1rem;
    max-width: 520px;
    margin: 0 auto clamp(3rem, 5vw, 4rem);
}

.steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
}

.step {
    position: relative;
    padding: var(--space-2xl);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: border-color var(--transition);
}

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

.step-number {
    font-family: var(--font-heading);
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-accent);
    opacity: 0.3;
    line-height: 1;
    margin-bottom: var(--space-md);
}

.step h3 {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    color: var(--color-text);
    margin-bottom: 0.75rem;
}

.step p {
    color: var(--color-text-muted);
    font-size: 0.92rem;
}

/* === Retailers === */
.retailers {
    padding: var(--space-section) 0;
    background: var(--color-surface);
}

.retailer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--space-md);
}

.retailer-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: border-color var(--transition);
}

.retailer-card:hover {
    border-color: var(--color-border-hover);
}

.retailer-name {
    font-family: var(--font-heading);
    font-weight: 600;
    color: var(--color-text);
    font-size: 0.95rem;
}

.retailer-tag {
    font-family: var(--font-heading);
    font-size: 0.72rem;
    font-weight: 600;
    padding: 0.25rem 0.6rem;
    border-radius: 999px;
    background: rgba(138, 133, 128, 0.1);
    color: var(--color-text-muted);
    white-space: nowrap;
}

.queue-tag {
    background: rgba(123, 158, 184, 0.12);
    color: var(--color-queue);
}

/* === Features === */
.features {
    padding: var(--space-section) 0;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
    margin-top: clamp(2rem, 4vw, 3rem);
}

.feature-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-2xl);
    transition: border-color var(--transition);
}

.feature-card:hover {
    border-color: var(--color-border-hover);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: var(--space-md);
}

.feature-card h3 {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    color: var(--color-text);
    margin-bottom: var(--space-sm);
}

.feature-card p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* === Install === */
.install {
    padding: var(--space-section) 0;
    background: var(--color-surface);
}

.install-steps {
    max-width: 600px;
    margin: clamp(2rem, 4vw, 3rem) auto 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.install-step {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.install-label {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.code-block {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1rem 1.25rem;
    overflow-x: auto;
}

.code-block code {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--color-accent);
    white-space: pre-wrap;
}

.install-note {
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.85rem;
    margin-top: var(--space-xl);
}

.install-note a {
    color: var(--color-accent);
}

/* === CTA === */
.cta {
    padding: var(--space-section) 0;
    text-align: center;
}

.cta h2 {
    margin-bottom: var(--space-xl);
}

/* === Footer === */
.site-footer {
    padding: var(--space-xl) 0;
    border-top: 1px solid var(--color-border);
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer-brand {
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

.footer-links {
    display: flex;
    gap: var(--space-lg);
}

.footer-links a {
    color: var(--color-text-muted);
    font-family: var(--font-heading);
    font-size: 0.85rem;
}

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

.footer-copy {
    color: var(--color-text-muted);
    font-size: 0.8rem;
}

/* === Animations === */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* === Responsive === */
@media (max-width: 640px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--color-bg);
        border-bottom: 1px solid var(--color-border);
        padding: var(--space-lg);
        gap: var(--space-md);
    }

    .nav-links.active {
        display: flex;
    }

    .mobile-toggle {
        display: flex;
    }

    .problem-grid,
    .steps,
    .feature-grid {
        grid-template-columns: 1fr;
    }

    .retailer-grid {
        grid-template-columns: 1fr;
    }

    .terminal-body {
        font-size: 0.75rem;
        padding: var(--space-md);
    }

    .footer-inner {
        flex-direction: column;
        gap: var(--space-md);
        text-align: center;
    }
    .nav-links a:not(.btn) { display: none; }

@media (min-width: 641px) and (max-width: 1024px) {
    .problem-grid,
    .steps {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--space-md);
    }

    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 640px) {
    :root { --space-section: 5rem; }
    .hero h1 { font-size: 3.25rem; }
    .hero-sub { font-size: 1.125rem; }
}