/* ============================================
   ASTROBOY API — Design System
   Dark Charcoal + Downy Cyan + Glowing White
   ============================================ */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

/* ── Custom Properties ── */
:root {
    /* Colors */
    --bg-deep:        #0d0d12;
    --bg-surface:     #13131a;
    --bg-surface-2:   #1a1a24;
    --bg-surface-3:   #22222e;
    --border:         #2a2a35;
    --border-light:   #3a3a48;

    --cyan:           #5CE0D8;
    --cyan-dim:       #3fb8b1;
    --cyan-glow:      rgba(92, 224, 216, 0.15);
    --cyan-glow-strong: rgba(92, 224, 216, 0.35);

    --text-primary:   #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted:     #6b6b7b;

    --success:        #4ade80;
    --error:          #f87171;
    --warning:        #fbbf24;

    /* Typography */
    --font-mono:  'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
    --font-sans:  'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Spacing */
    --space-xs:   0.25rem;
    --space-sm:   0.5rem;
    --space-md:   1rem;
    --space-lg:   1.5rem;
    --space-xl:   2rem;
    --space-2xl:  3rem;
    --space-3xl:  4rem;

    /* Radius */
    --radius-sm:  6px;
    --radius-md:  10px;
    --radius-lg:  14px;
    --radius-xl:  20px;
    --radius-full: 50px;

    /* Transitions */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --transition-fast: 0.15s var(--ease-out);
    --transition-normal: 0.3s var(--ease-out);
    --transition-slow: 0.5s var(--ease-out);
}

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

/* ── Base ── */
html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-deep);
    color: var(--text-secondary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

/* ── Dot Grid Background ── */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image: radial-gradient(circle, rgba(92, 224, 216, 0.06) 1px, transparent 1px);
    background-size: 28px 28px;
    pointer-events: none;
    z-index: 0;
}

/* ── Typography ── */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-mono);
    color: var(--text-primary);
    font-weight: 600;
    line-height: 1.2;
}

h1 {
    font-size: clamp(2rem, 6vw, 3.5rem);
    letter-spacing: -0.03em;
    text-shadow: 0 0 40px rgba(255, 255, 255, 0.15);
}

h2 {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    letter-spacing: -0.02em;
}

h3 {
    font-size: 1.1rem;
    letter-spacing: -0.01em;
}

p {
    color: var(--text-secondary);
    line-height: 1.7;
}

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

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

code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    color: var(--cyan);
    background: var(--bg-surface-2);
    padding: 0.15em 0.4em;
    border-radius: var(--radius-sm);
}

/* ── Layout ── */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
    position: relative;
    z-index: 1;
}

.section {
    padding: var(--space-3xl) 0;
}

/* ── Buttons ── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 0.75rem 1.75rem;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--cyan);
    color: var(--bg-deep);
    box-shadow: 0 0 20px var(--cyan-glow);
}

.btn-primary:hover {
    background: #7aeee7;
    color: var(--bg-deep);
    box-shadow: 0 0 35px var(--cyan-glow-strong);
    transform: translateY(-2px);
}

.btn-primary:active {
    transform: translateY(0);
}

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

.btn-outline:hover {
    border-color: var(--cyan);
    color: var(--cyan);
    box-shadow: 0 0 20px var(--cyan-glow);
    transform: translateY(-2px);
}

.btn-full {
    width: 100%;
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

/* ── Cards ── */
.card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    transition: all var(--transition-normal);
    position: relative;
}

.card::before {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: var(--radius-lg);
    padding: 1px;
    background: linear-gradient(135deg, transparent 40%, var(--cyan-glow) 100%);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity var(--transition-normal);
    pointer-events: none;
}

.card:hover {
    border-color: var(--border-light);
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.card:hover::before {
    opacity: 1;
}

.card-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    background: var(--bg-surface-2);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    margin-bottom: var(--space-lg);
    transition: all var(--transition-normal);
}

.card:hover .card-icon {
    border-color: var(--cyan);
    box-shadow: 0 0 15px var(--cyan-glow);
}

/* ── Inputs ── */
.input-group {
    margin-bottom: var(--space-lg);
}

.input-group label {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: var(--space-sm);
}

.input-field {
    width: 100%;
    padding: 0.8rem 1rem;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--text-primary);
    background: var(--bg-deep);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    outline: none;
}

.input-field::placeholder {
    color: var(--text-muted);
    font-family: var(--font-sans);
}

.input-field:focus {
    border-color: var(--cyan);
    box-shadow: 0 0 0 3px var(--cyan-glow), 0 0 20px var(--cyan-glow);
}

select.input-field {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%235CE0D8' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 2.5rem;
    cursor: pointer;
}

select.input-field option {
    background: var(--bg-surface);
    color: var(--text-primary);
}

/* ── Badges ── */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.2rem 0.6rem;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge-get {
    background: rgba(92, 224, 216, 0.12);
    color: var(--cyan);
    border: 1px solid rgba(92, 224, 216, 0.25);
}

.badge-post {
    background: rgba(251, 191, 36, 0.12);
    color: var(--warning);
    border: 1px solid rgba(251, 191, 36, 0.25);
}

.badge-live {
    background: rgba(74, 222, 128, 0.12);
    color: var(--success);
    border: 1px solid rgba(74, 222, 128, 0.25);
}

.badge-dead {
    background: rgba(248, 113, 113, 0.12);
    color: var(--error);
    border: 1px solid rgba(248, 113, 113, 0.25);
}

/* ── Code Block ── */
.code-block {
    background: var(--bg-deep);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.8;
    overflow-x: auto;
    position: relative;
}

.code-block .line-accent {
    color: var(--cyan);
}

.code-block .line-comment {
    color: var(--text-muted);
}

/* ── Response Box ── */
.response-box {
    background: var(--bg-deep);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    min-height: 150px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    overflow-x: auto;
    color: var(--text-secondary);
    transition: border-color var(--transition-normal);
}

.response-box.success {
    border-color: var(--success);
    box-shadow: 0 0 20px rgba(74, 222, 128, 0.1);
}

.response-box.error {
    border-color: var(--error);
    box-shadow: 0 0 20px rgba(248, 113, 113, 0.1);
}

/* ── Endpoint Display ── */
.endpoint {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    background: var(--bg-deep);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 0.75rem 1rem;
    margin-bottom: var(--space-md);
    font-family: var(--font-mono);
    font-size: 0.85rem;
}

.endpoint code {
    background: none;
    padding: 0;
    color: var(--text-secondary);
    flex: 1;
}

.endpoint .copy-btn {
    background: var(--bg-surface-2);
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 0.3rem 0.7rem;
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

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

/* ── Loading Spinner ── */
.spinner {
    width: 32px;
    height: 32px;
    border: 2px solid var(--border);
    border-top-color: var(--cyan);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    min-height: 150px;
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 0.85rem;
}

/* ── Scrollbar ── */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border-light);
}

/* ── Keyframe Animations ── */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes spin {
    to { transform: rotate(360deg); }
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

@keyframes pulseGlow {
    0%, 100% { box-shadow: 0 0 20px var(--cyan-glow); }
    50% { box-shadow: 0 0 40px var(--cyan-glow-strong); }
}

@keyframes slideReveal {
    from {
        opacity: 0;
        transform: translateX(-12px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes typewriter {
    from { width: 0; }
    to { width: 100%; }
}

@keyframes glowPulse {
    0%, 100% { text-shadow: 0 0 20px rgba(255, 255, 255, 0.1); }
    50% { text-shadow: 0 0 40px rgba(255, 255, 255, 0.2), 0 0 60px var(--cyan-glow); }
}

/* ── Utility: Reveal on scroll ── */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}

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

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ── Hero (Landing Page) ── */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 2;
}

.hero-inner {
    text-align: center;
    max-width: 720px;
    padding: var(--space-xl);
}

.hero h1 {
    animation: fadeInUp 0.8s var(--ease-out) both;
}

.hero-cursor {
    display: inline-block;
    width: 3px;
    height: 0.9em;
    background: var(--cyan);
    margin-left: 4px;
    vertical-align: text-bottom;
    animation: blink 1s step-end infinite;
    box-shadow: 0 0 8px var(--cyan-glow-strong);
}

.hero-tagline {
    font-size: clamp(1rem, 2.5vw, 1.2rem);
    color: var(--text-muted);
    margin-top: var(--space-lg);
    margin-bottom: var(--space-2xl);
    font-weight: 300;
    letter-spacing: 0.02em;
    animation: fadeInUp 0.8s var(--ease-out) 0.2s both;
}

.hero-actions {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s var(--ease-out) 0.4s both;
}

/* ── Feature Grid (Landing) ── */
.features {
    padding: var(--space-3xl) 0 calc(var(--space-3xl) * 2);
    position: relative;
    z-index: 2;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--space-lg);
    margin-top: var(--space-2xl);
}

.features-header {
    text-align: center;
    margin-bottom: var(--space-md);
}

.features-header p {
    margin-top: var(--space-sm);
}

/* ── Docs Layout ── */
.docs-layout {
    display: flex;
    min-height: 100vh;
    position: relative;
    z-index: 1;
}

.docs-sidebar {
    width: 260px;
    background: var(--bg-surface);
    border-right: 1px solid var(--border);
    padding: var(--space-xl) 0;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
    flex-shrink: 0;
}

.docs-sidebar-brand {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    padding: 0 var(--space-xl) var(--space-xl);
    border-bottom: 1px solid var(--border);
    margin-bottom: var(--space-lg);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.docs-sidebar-brand .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--cyan);
    box-shadow: 0 0 8px var(--cyan-glow-strong);
}

.docs-nav {
    list-style: none;
}

.docs-nav li {
    margin-bottom: 2px;
}

.docs-nav a {
    display: block;
    padding: 0.65rem var(--space-xl);
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    border-left: 2px solid transparent;
    transition: all var(--transition-fast);
}

.docs-nav a:hover {
    color: var(--text-secondary);
    background: rgba(92, 224, 216, 0.03);
    border-left-color: var(--border-light);
}

.docs-nav a.active {
    color: var(--cyan);
    background: rgba(92, 224, 216, 0.06);
    border-left-color: var(--cyan);
}

.docs-main {
    flex: 1;
    padding: var(--space-2xl) var(--space-2xl);
    overflow-y: auto;
}

.docs-section {
    display: none;
    animation: fadeIn 0.4s var(--ease-out);
}

.docs-section.active {
    display: block;
}

.docs-section-title {
    margin-bottom: var(--space-sm);
}

.docs-section-desc {
    margin-bottom: var(--space-2xl);
    max-width: 640px;
}

.docs-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    margin-top: var(--space-xl);
}

/* ── API Cards Grid (Docs Home) ── */
.api-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--space-lg);
    margin-top: var(--space-xl);
}

/* ── Gateway Checker Page ── */
.gateway-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-2xl);
    position: relative;
    z-index: 1;
}

.gateway-container {
    width: 100%;
    max-width: 520px;
}

.gateway-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.gateway-header h1 {
    font-size: clamp(1.5rem, 4vw, 2rem);
    margin-bottom: var(--space-sm);
}

.gateway-header p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.gateway-back {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    margin-bottom: var(--space-xl);
    transition: color var(--transition-fast);
}

.gateway-back:hover {
    color: var(--cyan);
}

.gateway-form {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
}

.gateway-result {
    margin-top: var(--space-lg);
}

.result-status {
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    text-align: center;
    animation: fadeInUp 0.3s var(--ease-out);
}

.result-status.live {
    background: rgba(74, 222, 128, 0.08);
    border: 1px solid rgba(74, 222, 128, 0.25);
    color: var(--success);
}

.result-status.dead {
    background: rgba(248, 113, 113, 0.08);
    border: 1px solid rgba(248, 113, 113, 0.25);
    color: var(--error);
}

.result-status.checking {
    background: rgba(92, 224, 216, 0.08);
    border: 1px solid rgba(92, 224, 216, 0.2);
    color: var(--cyan);
}

.pk-output {
    margin-top: var(--space-md);
}

.pk-output-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-sm);
}

.pk-output-header span {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.pk-textarea {
    width: 100%;
    min-height: 70px;
    background: var(--bg-deep);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 0.8rem 1rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--cyan);
    resize: none;
    outline: none;
}

.copy-small-btn {
    background: var(--bg-surface-2);
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 0.25rem 0.6rem;
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

/* ── Footer ── */
.footer {
    text-align: center;
    padding: var(--space-xl) 0;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.85rem;
    position: relative;
    z-index: 1;
}

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

/* ── Canvas overlay for landing ── */
#particleCanvas {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
}

/* ── Responsive ── */
@media (max-width: 1024px) {
    .docs-split {
        grid-template-columns: 1fr;
    }

    .docs-sidebar {
        width: 220px;
    }
}

@media (max-width: 768px) {
    .docs-layout {
        flex-direction: column;
    }

    .docs-sidebar {
        width: 100%;
        height: auto;
        position: relative;
        border-right: none;
        border-bottom: 1px solid var(--border);
    }

    .docs-nav {
        display: flex;
        overflow-x: auto;
        padding: 0 var(--space-md);
        gap: var(--space-xs);
    }

    .docs-nav li {
        margin: 0;
    }

    .docs-nav a {
        white-space: nowrap;
        border-left: none;
        border-bottom: 2px solid transparent;
        padding: var(--space-sm) var(--space-md);
    }

    .docs-nav a.active {
        border-left: none;
        border-bottom-color: var(--cyan);
    }

    .docs-main {
        padding: var(--space-xl) var(--space-md);
    }

    .hero-inner {
        padding: var(--space-md);
    }

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

    .gateway-page {
        padding: var(--space-lg) var(--space-md);
        align-items: flex-start;
        padding-top: var(--space-3xl);
    }
}