/* ============================================================
   ev — Landing Page Styles
   Dark theme · Teal accent · System fonts · Zero dependencies
   ============================================================ */

/* --- Design Tokens --- */
:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --bg-card: #161616;
    --bg-card-hover: #1c1c1c;
    --bg-terminal: #0d1117;
    --bg-code: #1a1a2e;

    --text-primary: #e6e6e6;
    --text-secondary: #999999;
    --text-dim: #666666;

    --accent: #00d4aa;
    --accent-hover: #00e6bb;
    --accent-glow: rgba(0, 212, 170, 0.15);
    --accent-subtle: rgba(0, 212, 170, 0.08);

    /* Terminal ANSI colors */
    --t-red: #ff6b6b;
    --t-green: #69db7c;
    --t-yellow: #ffd43b;
    --t-cyan: #66d9ef;
    --t-magenta: #c678dd;
    --t-dim: #636e7b;
    --t-bold: #ffffff;

    --border: #222222;
    --border-subtle: #1a1a1a;

    --font-body:
        -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu,
        Cantarell, sans-serif;
    --font-mono:
        "SF Mono", "Cascadia Code", "Fira Code", "JetBrains Mono", Menlo,
        Consolas, monospace;

    --section-padding: 6rem 0;
    --container-width: 1120px;
    --nav-height: 64px;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;

    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
}

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

a:hover {
    color: var(--accent-hover);
}

code {
    font-family: var(--font-mono);
    font-size: 0.9em;
}

p > code {
    border: solid 1px var(--accent-subtle);
    background-color: var(--accent-glow);
    border-radius: 3px;
    padding: 0.15em 0.4em;
}

img {
    max-width: 100%;
}

ul {
    list-style: none;
}

/* --- Layout --- */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section {
    padding: var(--section-padding);
}

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

.section-title {
    font-size: 2.25rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    max-width: 640px;
    margin: 0 auto 3rem;
    font-size: 1.1rem;
    line-height: 1.7;
}

/* --- Navigation --- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    height: var(--nav-height);
    background: transparent;
    transition:
        background var(--transition-normal),
        border-color var(--transition-normal);
    border-bottom: 1px solid transparent;
}

.nav.scrolled {
    background: rgba(10, 10, 10, 0.88);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom-color: var(--border);
}

.nav-inner {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 1.5rem;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--accent);
    letter-spacing: -0.02em;
}

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

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

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

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

.nav-gh {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.4rem 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.85rem !important;
}

.nav-gh:hover {
    border-color: var(--accent);
    color: var(--accent) !important;
}

.nav-gh svg {
    width: 16px;
    height: 16px;
    fill: currentColor;
}

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

.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* --- Hero --- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: calc(var(--nav-height) + 3rem) 0 4rem;
    background:
        radial-gradient(
            ellipse 60% 50% at 20% 50%,
            var(--accent-glow),
            transparent
        ),
        radial-gradient(
            ellipse 40% 60% at 80% 30%,
            rgba(102, 217, 239, 0.04),
            transparent
        ),
        var(--bg-primary);
}

.hero > .container {
    display: flex;
    align-items: center;
    gap: 4rem;
}

.hero-content {
    flex: 0 0 50%;
    max-width: 560px;
}

.hero-badge {
    display: inline-block;
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 0.3rem 1rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    letter-spacing: 0.02em;
}

.hero-title {
    font-size: clamp(2rem, 4.5vw, 3.25rem);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin-bottom: 1.5rem;
}

.hero-accent {
    color: var(--accent);
}

.hero-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: 2rem;
}

.hero-subtitle code {
    color: var(--accent);
    background: var(--accent-subtle);
    padding: 0.15em 0.4em;
    border-radius: 4px;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.hero-terminal {
    flex: 1;
    min-width: 0;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.95rem;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn-primary {
    background: var(--accent);
    color: #0a0a0a;
    box-shadow: 0 0 20px var(--accent-glow);
}

.btn-primary:hover {
    background: var(--accent-hover);
    color: #0a0a0a;
    box-shadow: 0 0 30px rgba(0, 212, 170, 0.3);
    transform: translateY(-1px);
}

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

.btn-secondary:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.btn-secondary svg {
    width: 18px;
    height: 18px;
    fill: currentColor;
}

/* --- Terminal Mockup --- */
.terminal {
    background: var(--bg-terminal);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow:
        0 25px 50px -12px rgba(0, 0, 0, 0.5),
        inset 0 0 60px rgba(0, 212, 170, 0.02);
}

.terminal-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: rgba(255, 255, 255, 0.03);
    border-bottom: 1px solid var(--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 {
    flex: 1;
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-dim);
}

.terminal-body {
    padding: 1.25rem;
    overflow-x: auto;
}

.terminal-body pre {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    line-height: 1.55;
    color: var(--text-secondary);
    margin: 0;
}

.terminal-large {
    max-width: 800px;
    margin: 0 auto;
}

/* Terminal text colors */
.t-red {
    color: var(--t-red);
}
.t-green {
    color: var(--t-green);
}
.t-yellow {
    color: var(--t-yellow);
}
.t-cyan {
    color: var(--t-cyan);
}
.t-magenta {
    color: var(--t-magenta);
}
.t-dim {
    color: var(--t-dim);
}
.t-bold {
    font-weight: 700;
    color: var(--t-bold);
}

/* --- Cards --- */
.cards-grid {
    display: grid;
    gap: 1.5rem;
}

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

.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 2rem;
    transition: all var(--transition-normal);
}

.card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(0, 212, 170, 0.3);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.card-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-subtle);
    border-radius: var(--radius-sm);
    margin-bottom: 1.25rem;
    color: var(--accent);
}

.card-icon svg {
    width: 24px;
    height: 24px;
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.card h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* --- Features Grid --- */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.feature {
    padding: 1.75rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

.feature:hover {
    border-color: rgba(0, 212, 170, 0.3);
    box-shadow: 0 0 20px var(--accent-glow);
}

.feature-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-subtle);
    border-radius: var(--radius-sm);
    margin-bottom: 1rem;
    color: var(--accent);
}

.feature-icon svg {
    width: 22px;
    height: 22px;
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.feature h3 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
}

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

/* --- Steps (How it works) --- */
.steps {
    max-width: 620px;
    margin: 0 auto;
}

.step {
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
}

.step-number {
    width: 48px;
    height: 48px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--accent);
    border-radius: 50%;
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--accent);
}

.step-content {
    padding-top: 0.25rem;
}

.step-content h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 0.4rem;
}

.step-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 0.75rem;
}

.step-connector {
    width: 2px;
    height: 2rem;
    margin-left: 23px;
    border-left: 2px dashed var(--border);
}

.step-code {
    background: var(--bg-terminal);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.65rem 1rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--t-green);
    overflow-x: auto;
}

.step-code code {
    font-size: inherit;
}

/* --- Architecture --- */
.arch-diagram {
    background: var(--bg-terminal);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    margin-bottom: 2.5rem;
    overflow-x: auto;
    text-align: center;
}

.arch-ascii {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    line-height: 1.4;
    color: var(--text-secondary);
    display: inline-block;
    text-align: left;
    margin: 0;
}

.arch-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.arch-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    transition: border-color var(--transition-normal);
}

.arch-card:hover {
    border-color: rgba(0, 212, 170, 0.3);
}

.arch-card h4 {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 0.4rem;
    color: var(--accent);
}

.arch-card p {
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.55;
}

/* --- Quick Start --- */
.quickstart-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.quickstart-step:first-child {
    grid-column: span 2;
}

.quickstart-step h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.code-block {
    background: var(--bg-terminal);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.03);
    border-bottom: 1px solid var(--border);
    font-size: 0.75rem;
    color: var(--text-dim);
}

.code-block pre {
    padding: 1rem;
    margin: 0;
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    line-height: 1.55;
    color: var(--text-secondary);
}

.copy-btn {
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.2rem 0.6rem;
    color: var(--text-dim);
    font-size: 0.7rem;
    font-family: var(--font-body);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.copy-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.copy-btn.copied {
    border-color: var(--t-green);
    color: var(--t-green);
}

/* --- Footer --- */
.footer {
    border-top: 1px solid var(--border);
    padding: 4rem 0 2rem;
    background: var(--bg-secondary);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 2rem;
    margin-bottom: 3rem;
}

.footer-brand {
    padding-right: 2rem;
}

.footer-logo {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--accent);
    display: block;
    margin-bottom: 0.75rem;
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

.footer-col h4 {
    color: var(--text-primary);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-col li {
    margin-bottom: 0.6rem;
}

.footer-col a {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-col a:hover {
    color: var(--accent);
}

.footer-bottom {
    border-top: 1px solid var(--border);
    padding-top: 1.5rem;
    text-align: center;
    color: var(--text-dim);
    font-size: 0.85rem;
}

/* --- Scroll Animations --- */
[data-animate] {
    opacity: 0;
    transform: translateY(20px);
    transition:
        opacity 0.6s ease,
        transform 0.6s ease;
}

[data-animate].visible {
    opacity: 1;
    transform: translateY(0);
}

[data-animate]:nth-child(2) {
    transition-delay: 0.1s;
}
[data-animate]:nth-child(3) {
    transition-delay: 0.2s;
}
[data-animate]:nth-child(4) {
    transition-delay: 0.3s;
}
[data-animate]:nth-child(5) {
    transition-delay: 0.35s;
}
[data-animate]:nth-child(6) {
    transition-delay: 0.4s;
}
[data-animate]:nth-child(7) {
    transition-delay: 0.45s;
}

/* --- Responsive: Tablet --- */
@media (max-width: 1024px) {
    .hero > .container {
        flex-direction: column;
        text-align: center;
    }

    .hero-content {
        flex: none;
        max-width: 640px;
    }

    .hero-actions {
        justify-content: center;
    }

    .hero-terminal {
        width: 100%;
        max-width: 600px;
    }

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

    .feature:last-child {
        grid-column: auto;
    }

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

    .quickstart-grid {
        grid-template-columns: 1fr;
        max-width: 600px;
        margin: 0 auto;
    }

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

/* --- Responsive: Mobile --- */
@media (max-width: 768px) {
    :root {
        --section-padding: 4rem 0;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-links {
        position: absolute;
        top: var(--nav-height);
        left: 0;
        right: 0;
        flex-direction: column;
        background: rgba(10, 10, 10, 0.95);
        backdrop-filter: blur(14px);
        -webkit-backdrop-filter: blur(14px);
        border-bottom: 1px solid var(--border);
        padding: 1rem 1.5rem;
        gap: 0.75rem;
        display: none;
    }

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

    .cards-3 {
        grid-template-columns: 1fr;
    }

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

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

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

    .section-title {
        font-size: 1.75rem;
    }

    .section-subtitle {
        font-size: 1rem;
    }

    .arch-ascii {
        font-size: 0.6rem;
    }

    .terminal-body pre {
        font-size: 0.72rem;
    }
}

/* --- Responsive: Small mobile --- */
@media (max-width: 480px) {
    .hero-title {
        font-size: 1.6rem;
    }

    .hero-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .btn {
        justify-content: center;
    }

    .step {
        gap: 1rem;
    }

    .step-number {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }

    .step-connector {
        margin-left: 19px;
    }
}