/* ═══════════════════════════════════════════════════
   IO Platform — Documentation Portal
   ═══════════════════════════════════════════════════ */

/* ── Variables ─────────────────────────────────── */
:root {
    --bg: #06080f;
    --surface: rgba(13, 18, 32, 0.88);
    --surface-hover: rgba(18, 24, 42, 0.92);
    --border: rgba(255, 255, 255, 0.06);
    --border-hover: rgba(255, 255, 255, 0.12);
    --text-1: #e8ecf4;
    --text-2: #7a8599;
    --text-3: #454f5f;
    --cyan: #22d3ee;
    --indigo: #818cf8;
    --violet: #a78bfa;
    --radius: 14px;
    --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg);
    color: var(--text-1);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
}

/* ── Mesh Gradient Background ──────────────────── */
.bg-mesh {
    position: fixed;
    inset: 0;
    z-index: -2;
    overflow: hidden;
}

.bg-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    will-change: transform;
}

.bg-orb-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(34, 211, 238, 0.12), transparent 70%);
    top: -200px;
    left: 50%;
    transform: translateX(-50%);
    animation: drift1 14s ease-in-out infinite alternate;
}

.bg-orb-2 {
    width: 450px;
    height: 450px;
    background: radial-gradient(circle, rgba(129, 140, 248, 0.1), transparent 70%);
    top: 40%;
    right: -120px;
    animation: drift2 18s ease-in-out infinite alternate;
}

.bg-orb-3 {
    width: 350px;
    height: 350px;
    background: radial-gradient(circle, rgba(167, 139, 250, 0.08), transparent 70%);
    bottom: -80px;
    left: -60px;
    animation: drift3 12s ease-in-out infinite alternate;
}

@keyframes drift1 {
    to {
        transform: translateX(-45%) translateY(30px) scale(1.08);
    }
}

@keyframes drift2 {
    to {
        transform: translateY(-50px) scale(0.92);
    }
}

@keyframes drift3 {
    to {
        transform: translate(30px, -25px) scale(1.1);
    }
}

/* ── Dot Grid Overlay ──────────────────────────── */
.bg-grid {
    position: fixed;
    inset: 0;
    z-index: -1;
    background-image: radial-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px);
    background-size: 28px 28px;
    mask-image: radial-gradient(ellipse 70% 50% at 50% 30%, black, transparent);
    -webkit-mask-image: radial-gradient(ellipse 70% 50% at 50% 30%, black, transparent);
    pointer-events: none;
}

/* ── Page Layout ───────────────────────────────── */
.page {
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    position: relative;
    z-index: 1;
}

/* ── Hero Section ──────────────────────────────── */
.hero {
    text-align: center;
    padding: 120px 0 40px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--cyan);
    background: rgba(34, 211, 238, 0.06);
    border: 1px solid rgba(34, 211, 238, 0.12);
    padding: 7px 18px;
    border-radius: 999px;
    margin-bottom: 36px;
}

.hero-badge-dot {
    width: 6px;
    height: 6px;
    background: var(--cyan);
    border-radius: 50%;
    box-shadow: 0 0 10px rgba(34, 211, 238, 0.8);
    animation: pulse 2.5s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.4;
    }
}

.hero-title {
    margin-bottom: 20px;
}

.hero-title-main {
    display: block;
    font-size: clamp(2.8rem, 5.5vw, 4.5rem);
    font-weight: 800;
    letter-spacing: -0.035em;
    line-height: 1.05;
    background: linear-gradient(160deg, #fff 30%, rgba(255, 255, 255, 0.7) 60%, var(--cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-title-typed {
    display: block;
    font-family: 'Instrument Serif', Georgia, serif;
    font-style: italic;
    font-weight: 400;
    font-size: clamp(2rem, 4vw, 3.2rem);
    line-height: 1.3;
    min-height: 1.3em;
    background: linear-gradient(135deg, var(--cyan) 20%, var(--violet));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 0 20px rgba(34, 211, 238, 0.15));
}

.type-cursor {
    display: inline-block;
    width: 2px;
    height: 0.8em;
    background: var(--cyan);
    margin-left: 3px;
    border-radius: 1px;
    vertical-align: text-bottom;
    animation: blink 1.1s step-end infinite;
    box-shadow: 0 0 8px rgba(34, 211, 238, 0.5);
}

@keyframes blink {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0;
    }
}

.hero-desc {
    font-size: 1.1rem;
    color: var(--text-2);
    margin-bottom: 0;
}

/* ── Code Window Illustration ──────────────────── */
.hero-visual {
    max-width: 600px;
    margin: 48px auto 56px;
}

.code-window {
    background: rgba(8, 12, 24, 0.95);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    overflow: hidden;
    box-shadow:
        0 24px 80px rgba(0, 0, 0, 0.5),
        0 0 0 1px rgba(255, 255, 255, 0.03),
        0 0 60px rgba(34, 211, 238, 0.04);
}

.code-titlebar {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: rgba(255, 255, 255, 0.03);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.code-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--dot-c);
    opacity: 0.8;
}

.code-titlebar-text {
    margin-left: auto;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    color: var(--text-3);
}

.code-body {
    padding: 20px 24px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    line-height: 1.85;
    color: var(--text-2);
    overflow-x: auto;
    margin: 0;
}

.ln {
    color: rgba(255, 255, 255, 0.12);
    user-select: none;
    display: inline-block;
    width: 2ch;
    text-align: right;
    margin-right: 16px;
}

.c-prompt {
    color: var(--cyan);
}

.c-cmd {
    color: var(--text-1);
    font-weight: 500;
}

.c-ok {
    color: #28c840;
}

.c-info {
    color: var(--indigo);
}

.c-path {
    color: var(--violet);
}

.c-link {
    color: var(--cyan);
    text-decoration: underline;
    text-decoration-color: rgba(34, 211, 238, 0.3);
    text-underline-offset: 2px;
}

/* ── Features Section ──────────────────────────── */
.features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 56px;
}

.feature-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: border-color 0.3s, background 0.3s, transform 0.3s var(--ease);
}

.feature-card:hover {
    border-color: var(--border-hover);
    background: var(--surface-hover);
    transform: translateY(-2px);
}

.feature-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    margin-bottom: 16px;
}

.feature-icon--cyan {
    background: rgba(34, 211, 238, 0.08);
    color: var(--cyan);
}

.feature-icon--indigo {
    background: rgba(129, 140, 248, 0.08);
    color: var(--indigo);
}

.feature-icon--violet {
    background: rgba(167, 139, 250, 0.08);
    color: var(--violet);
}

.feature-card h3 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 6px;
    letter-spacing: -0.01em;
}

.feature-card p {
    font-size: 0.82rem;
    color: var(--text-2);
    line-height: 1.55;
}

/* ── Filter Navigation ─────────────────────────── */
.filter-nav {
    display: flex;
    justify-content: center;
    gap: 6px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.filter-btn {
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-2);
    background: transparent;
    border: 1px solid transparent;
    padding: 7px 18px;
    border-radius: 999px;
    cursor: pointer;
    transition: all 0.25s var(--ease);
}

.filter-btn:hover {
    color: var(--text-1);
    background: rgba(255, 255, 255, 0.04);
}

.filter-btn.active {
    color: var(--cyan);
    background: rgba(34, 211, 238, 0.06);
    border-color: rgba(34, 211, 238, 0.15);
}

/* ── Card Grid ─────────────────────────────────── */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 18px;
    margin-bottom: 80px;
}

/* ── Document Card ─────────────────────────────── */
.doc-card {
    position: relative;
    display: block;
    text-decoration: none;
    border-radius: var(--radius);
    padding: 1px;
    background: var(--border);
    transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
    opacity: 0;
    transform: translateY(20px);
    animation: fadeUp 0.7s var(--ease) forwards;
}

.doc-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.35);
}

/* Mouse-follow gradient border glow */
.doc-card::before {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: radial-gradient(500px circle at var(--mx, 250px) var(--my, 150px),
            rgba(34, 211, 238, 0.35),
            rgba(129, 140, 248, 0.1) 30%,
            transparent 50%);
    opacity: 0;
    transition: opacity 0.5s;
    pointer-events: none;
}

.card-grid:hover .doc-card::before {
    opacity: 1;
}

/* Card inner content */
.card-inner {
    position: relative;
    z-index: 1;
    background: var(--surface);
    border-radius: calc(var(--radius) - 1px);
    height: 100%;
    display: flex;
    flex-direction: column;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transition: background 0.3s;
    overflow: hidden;
}

.doc-card:hover .card-inner {
    background: var(--surface-hover);
}

/* Card banner illustration */
.card-banner {
    height: 140px;
    position: relative;
    overflow: hidden;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
}

.card-banner-svg {
    width: 100%;
    height: 100%;
    position: absolute;
    inset: 0;
}

/* Card body */
.card-body {
    padding: 24px 28px 28px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

/* Card icon */
.card-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    background: linear-gradient(135deg, rgba(34, 211, 238, 0.08), rgba(129, 140, 248, 0.06));
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    margin-bottom: 16px;
}

/* Card typography */
.doc-card h2 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-1);
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

.doc-card p {
    font-size: 0.88rem;
    color: var(--text-2);
    line-height: 1.65;
    flex-grow: 1;
    margin-bottom: 20px;
}

/* Card bottom meta row */
.card-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

.version-tag {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.72rem;
    font-weight: 500;
    color: var(--cyan);
    background: rgba(34, 211, 238, 0.06);
    padding: 3px 10px;
    border-radius: 6px;
}

.card-action {
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-2);
    display: flex;
    align-items: center;
    gap: 6px;
    transition: color 0.25s, gap 0.35s var(--ease);
}

.card-action svg {
    transition: transform 0.35s var(--ease);
}

.doc-card:hover .card-action {
    color: var(--cyan);
}

.doc-card:hover .card-action svg {
    transform: translateX(3px);
}

/* ── Footer ────────────────────────────────────── */
.footer {
    margin-top: auto;
    border-top: 1px solid var(--border);
    padding: 32px 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.82rem;
    color: var(--text-3);
}

.footer-links {
    display: flex;
    gap: 20px;
}

.footer-links a {
    color: var(--text-3);
    text-decoration: none;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: var(--text-1);
}

/* ── Staggered Reveal Animations ───────────────── */
.animate-in {
    opacity: 0;
    transform: translateY(16px);
    animation: fadeUp 0.8s var(--ease) forwards;
    animation-delay: calc(var(--delay, 0) * 0.1s + 0.15s);
}

@keyframes fadeUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ── Responsive ────────────────────────────────── */
@media (max-width: 768px) {
    .hero {
        padding: 88px 0 32px;
    }

    .hero-visual {
        margin: 36px auto 40px;
    }

    .code-body {
        font-size: 0.72rem;
        padding: 16px 14px;
    }

    .features {
        grid-template-columns: 1fr;
        gap: 12px;
    }

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

    .footer {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }

    .bg-orb {
        filter: blur(80px);
        opacity: 0.25;
    }

    .bg-orb-1 {
        width: 350px;
        height: 350px;
    }

    .bg-orb-2 {
        width: 280px;
        height: 280px;
    }

    .bg-orb-3 {
        width: 220px;
        height: 220px;
    }
}

@media (max-width: 480px) {
    .page {
        padding: 0 16px;
    }

    .filter-btn {
        padding: 6px 14px;
        font-size: 0.8rem;
    }
}