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

:root {
    --bg: #0a0a0f;
    --bg-card: #13131a;
    --bg-elevated: #1a1a24;
    --border: #2a2a3a;
    --text: #e8e8f0;
    --text-secondary: #8888a0;
    --accent: #7c5cfc;
    --accent-glow: rgba(124, 92, 252, 0.3);
    --green: #34d399;
    --orange: #fb923c;
    --red: #f87171;
    --radius: 12px;
    --radius-lg: 20px;
}

html { scroll-behavior: smooth; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ========== Nav ========== */
.nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}
.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}
.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text);
    font-weight: 700;
    font-size: 18px;
}
.nav-logo-icon {
    width: 28px;
    height: 28px;
    image-rendering: pixelated;
}
.nav-links {
    display: flex;
    align-items: center;
    gap: 24px;
}
.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s;
}
.nav-links a:hover { color: var(--text); }
.nav-links a.nav-lang {
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 2px 8px;
    font-size: 12px;
    letter-spacing: 0.04em;
}
.nav-lang-menu {
    position: relative;
}
.nav-lang-menu > summary {
    list-style: none;
    cursor: pointer;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 2px 8px;
    font-size: 12px;
    letter-spacing: 0.04em;
    color: var(--text-secondary);
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: color 0.2s;
    user-select: none;
}
.nav-lang-menu > summary::-webkit-details-marker { display: none; }
.nav-lang-menu > summary::after {
    content: "▾";
    font-size: 10px;
    opacity: 0.7;
}
.nav-lang-menu > summary:hover { color: var(--text); }
.nav-lang-menu[open] > summary { color: var(--text); border-color: var(--text-secondary); }
.nav-lang-menu-panel {
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 4px 0;
    min-width: 128px;
    display: flex;
    flex-direction: column;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
    z-index: 10;
}
.nav-links .nav-lang-menu-panel a {
    padding: 8px 14px;
    font-size: 13px;
    color: var(--text-secondary);
    white-space: nowrap;
    border: 0;
    border-radius: 0;
    letter-spacing: normal;
}
.nav-links .nav-lang-menu-panel a:hover {
    color: var(--text);
    background: var(--bg-card);
}

/* ========== Buttons ========== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    border-radius: 10px;
    text-decoration: none;
    transition: all 0.2s;
    cursor: pointer;
    border: none;
    white-space: nowrap;
}
.btn-sm { padding: 6px 16px; font-size: 13px; }
.btn-lg { padding: 14px 28px; font-size: 16px; }
.btn-xl { padding: 18px 36px; font-size: 18px; border-radius: 14px; }
.btn-primary {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 0 20px var(--accent-glow);
}
.btn-primary:hover {
    background: #6a48f0;
    box-shadow: 0 0 30px var(--accent-glow);
    transform: translateY(-1px);
}
.btn-ghost {
    background: var(--bg-elevated);
    color: var(--text);
    border: 1px solid var(--border);
}
.btn-ghost:hover {
    background: var(--bg-card);
    border-color: var(--text-secondary);
}
.btn-sm.btn {
    background: var(--accent);
    color: #fff;
    padding: 7px 18px;
    border-radius: 8px;
}

/* ========== Hero ========== */
.hero {
    padding: 140px 0 80px;
    min-height: 100vh;
    display: flex;
    align-items: center;
}
.hero-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.hero-centered { min-height: calc(100vh - 80px); }
.hero-inner-centered {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 18px;
}
.hero-inner-centered h1 {
    font-size: 48px;
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -0.5px;
}
.hero-inner-centered .hero-desc {
    font-size: 17px;
    color: var(--text-secondary);
    max-width: 520px;
    margin: 0;
}
.hero-pet-stage {
    width: 180px;
    height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 8px;
}
.hero-mascot {
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 0 4px;
}
.hero-mascot .sprite-anim {
    height: 72px;
    width: auto;
    filter: drop-shadow(0 6px 16px var(--accent-glow));
}
@media (max-width: 768px) {
    .hero-mascot { height: 60px; }
    .hero-mascot .sprite-anim { height: 60px; }
}
.hero-inner-centered .hero-actions {
    margin-top: 8px;
}
.hero-inner-centered .download-version {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 4px;
}
.hero-inner-centered .preview-stage {
    margin-top: 56px;
}
.badge {
    display: inline-block;
    padding: 6px 14px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 100px;
    font-size: 13px;
    font-weight: 500;
    color: var(--accent);
    margin-bottom: 20px;
}
.hero h1 {
    font-size: 44px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
    letter-spacing: -0.5px;
}
.hero-desc {
    font-size: 17px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 32px;
    max-width: 480px;
}
.hero-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

/* ========== Hero Preview Mockup ========== */
.hero-visual {
    display: flex;
    justify-content: center;
}
.preview-stage {
    width: 100%;
    max-width: 460px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: stretch;
}
.preview-mockup {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    background:
        radial-gradient(120% 80% at 30% 0%, rgba(124, 92, 252, 0.12), transparent 60%),
        linear-gradient(180deg, #1b1b26 0%, #11111a 100%);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}
.preview-menubar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 28px;
    padding: 0 12px;
    background: rgba(8, 8, 12, 0.72);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    font-size: 12px;
    color: var(--text);
    gap: 8px;
}
.preview-menubar-left,
.preview-menubar-right {
    display: flex;
    align-items: center;
    gap: 10px;
    height: 100%;
    min-width: 0;
}
.preview-menubar-left { overflow: hidden; }
.preview-menubar-left strong {
    font-weight: 700;
    font-size: 13px;
    white-space: nowrap;
}
.preview-menubar-left span {
    color: rgba(232, 232, 240, 0.85);
    font-weight: 400;
    white-space: nowrap;
}
.preview-tokens {
    font-size: 11px;
    font-variant-numeric: tabular-nums;
    color: rgba(232, 232, 240, 0.72);
    white-space: nowrap;
}
.preview-icon {
    display: inline-flex;
    align-items: center;
    color: rgba(232, 232, 240, 0.85);
}
.preview-clock {
    font-size: 12px;
    font-variant-numeric: tabular-nums;
    color: rgba(232, 232, 240, 0.9);
    white-space: nowrap;
}
.preview-drop {
    position: relative;
    margin: 16px;
    border: 2px dashed rgba(255, 255, 255, 0.12);
    border-radius: var(--radius);
    padding: 28px 20px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s;
    min-height: 140px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.preview-drop:hover,
.preview-drop.is-drag {
    border-color: var(--accent);
    background: rgba(124, 92, 252, 0.06);
}
.preview-drop.is-loaded {
    border-style: solid;
    border-color: var(--accent);
    background: rgba(124, 92, 252, 0.06);
}
.preview-drop input[type="file"] {
    position: absolute;
    width: 1px;
    height: 1px;
    opacity: 0;
    overflow: hidden;
    pointer-events: none;
}
.preview-drop label {
    display: block;
    cursor: pointer;
    width: 100%;
}
.preview-drop-icon {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(124, 92, 252, 0.14);
    color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 10px;
}
.preview-drop.is-loaded .preview-drop-icon {
    background: var(--accent);
    color: #fff;
}
.preview-drop-title {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 4px;
    word-break: break-all;
}
.preview-drop-hint {
    display: block;
    font-size: 12px;
    color: var(--text-secondary);
}
.preview-url {
    display: flex;
    gap: 6px;
    margin: 0 16px 12px;
}
.preview-url input {
    flex: 1;
    min-width: 0;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 8px 12px;
    color: var(--text);
    font-size: 12px;
    font-family: inherit;
}
.preview-url input::placeholder { color: var(--text-secondary); }
.preview-url input:focus {
    outline: none;
    border-color: var(--accent);
}
.preview-url button {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 12px;
    font-weight: 600;
    padding: 8px 14px;
    cursor: pointer;
    white-space: nowrap;
    transition: border-color 0.15s, color 0.15s;
}
.preview-url button:hover {
    border-color: var(--accent);
    color: var(--text);
}
.preview-speeds {
    display: flex;
    justify-content: center;
    gap: 4px;
    padding: 0 16px 16px;
}
.preview-speeds[hidden] { display: none; }
.preview-speeds .speed-btn {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: var(--text-secondary);
    font-size: 11px;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 999px;
    cursor: pointer;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.preview-speeds .speed-btn:hover {
    color: var(--text);
    border-color: var(--accent);
}
.preview-speeds .speed-btn.is-active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

/* ========== Runner Slot ========== */
.runner-slot {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}
.runner-slot-menubar { height: 20px; }
.runner-slot-menubar > .sprite-anim { height: 20px; }
.runner-slot > .runner-gif-canvas {
    display: block;
    height: 100%;
    width: auto;
    image-rendering: pixelated;
    image-rendering: crisp-edges;
}

/* ========== Runner Picker (below preview) ========== */
.runner-picker {
    max-width: 460px;
    margin: 16px auto 0;
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding: 4px 2px;
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
}
.runner-picker::-webkit-scrollbar { height: 6px; }
.runner-picker::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
.runner-pick {
    flex: 0 0 auto;
    width: 64px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 8px 4px 6px;
    text-align: center;
    cursor: pointer;
    color: inherit;
    font: inherit;
    appearance: none;
    -webkit-appearance: none;
    transition: border-color 0.15s, transform 0.15s, box-shadow 0.15s;
    position: relative;
}
.runner-pick:hover { border-color: var(--accent); transform: translateY(-1px); }
.runner-pick:focus { outline: none; }
.runner-pick:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}
.runner-pick.is-selected {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent), 0 0 16px var(--accent-glow);
}
.runner-pick-stage {
    height: 44px;
    margin: 0 auto 6px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.runner-pick-stage .sprite-anim { height: 36px; }
.runner-pick-name {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.runner-pick.is-selected .runner-pick-name {
    color: var(--text);
}
.picker-note {
    text-align: center;
    margin: 10px auto 0;
    font-size: 11px;
    color: var(--text-secondary);
    max-width: 460px;
}
.character-error {
    text-align: center;
    margin: 8px auto 0;
    font-size: 12px;
    color: var(--red);
    max-width: 460px;
}

/* ========== Features ========== */
.features {
    padding: 100px 0;
}
.section-title {
    text-align: center;
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 12px;
    letter-spacing: -0.3px;
}
.section-desc {
    text-align: center;
    color: var(--text-secondary);
    font-size: 17px;
    margin-bottom: 56px;
}
.characters-note {
    text-align: center;
    color: var(--text-secondary);
    font-size: 15px;
    margin-top: 32px;
}
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    transition: border-color 0.2s, transform 0.2s;
}
.feature-card:hover {
    border-color: var(--accent);
    transform: translateY(-3px);
}
.feature-icon {
    font-size: 28px;
    margin-bottom: 14px;
}
.feature-card h3 {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 8px;
}
.feature-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ========== How it works ========== */
.how-it-works {
    padding: 80px 0 100px;
}
.steps {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 16px;
    margin-top: 48px;
}
.step {
    flex: 1;
    max-width: 260px;
    text-align: center;
}
.step-num {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--accent);
    color: #fff;
    font-weight: 800;
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    box-shadow: 0 0 20px var(--accent-glow);
}
.step h3 {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 8px;
}
.step p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}
.step-arrow {
    font-size: 24px;
    color: var(--text-secondary);
    padding-top: 10px;
}

/* ========== Download ========== */
.download {
    padding: 100px 0;
}
.download-inner {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}
.download-pet {
    margin-bottom: 8px;
}
.download h2 {
    font-size: 36px;
    font-weight: 800;
}
.download p {
    color: var(--text-secondary);
    font-size: 15px;
    margin-bottom: 8px;
}
.download-version {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* ========== Footer ========== */
.footer {
    border-top: 1px solid var(--border);
    padding: 24px 0;
}
.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    color: var(--text-secondary);
}
.footer-note {
    font-size: 12px;
    color: var(--text-secondary);
    margin: 0 0 12px;
    opacity: 0.8;
}
.footer a {
    color: var(--text-secondary);
    text-decoration: none;
}
.footer a:hover { color: var(--text); }

/* ========== Help Page ========== */
.help-hero {
    padding: 140px 0 40px;
    text-align: center;
}
.help-hero h1 {
    font-size: 42px;
    font-weight: 800;
    margin-bottom: 12px;
}
.help-hero p {
    color: var(--text-secondary);
    font-size: 16px;
}
.help-layout {
    padding: 40px 0 100px;
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 48px;
}
.help-toc {
    position: sticky;
    top: 90px;
    align-self: start;
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 14px;
}
.help-toc a {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 6px 10px;
    border-radius: 6px;
    transition: all 0.15s;
}
.help-toc a:hover {
    color: var(--text);
    background: var(--bg-elevated);
}
.help-content h2 {
    font-size: 26px;
    font-weight: 700;
    margin: 48px 0 16px;
    scroll-margin-top: 80px;
}
.help-content h2:first-child { margin-top: 0; }
.help-content h3 {
    font-size: 17px;
    font-weight: 600;
    margin: 24px 0 8px;
    color: var(--text);
}
.help-content p,
.help-content li {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.7;
}
.help-content ul,
.help-content ol {
    padding-left: 22px;
    margin: 8px 0 16px;
}
.help-content li { margin-bottom: 6px; }
.help-content code {
    font-family: 'SF Mono', Menlo, Consolas, monospace;
    font-size: 13px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    padding: 2px 6px;
    border-radius: 4px;
    color: var(--text);
}
.help-content a {
    color: var(--accent);
    text-decoration: none;
}
.help-content a:hover { text-decoration: underline; }
.help-callout {
    border-left: 3px solid var(--accent);
    background: var(--bg-card);
    padding: 14px 18px;
    border-radius: 0 8px 8px 0;
    margin: 16px 0;
    font-size: 14px;
    color: var(--text-secondary);
}
.help-callout strong { color: var(--text); }
@media (max-width: 768px) {
    .help-layout { grid-template-columns: 1fr; gap: 24px; }
    .help-toc { position: static; }
    .help-hero h1 { font-size: 32px; }
}

/* ========== Sprite Animation ========== */
.sprite-anim {
    image-rendering: pixelated;
    image-rendering: crisp-edges;
    background-repeat: no-repeat;
    width: 32px;
    height: 32px;
}

/* ========== Responsive ========== */
@media (max-width: 768px) {
    .hero { padding: 100px 0 60px; min-height: auto; }
    .hero-inner {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }
    .hero h1 { font-size: 32px; }
    .hero-desc { margin: 0 auto 28px; }
    .hero-actions { justify-content: center; }
    .features-grid { grid-template-columns: 1fr; max-width: 400px; margin: 0 auto; }
    .steps { flex-direction: column; align-items: center; }
    .step-arrow { transform: rotate(90deg); }
    .preview-stage { max-width: 360px; }
    .preview-menubar-left span:nth-of-type(2),
    .preview-menubar-left span:nth-of-type(3) { display: none; }
    .preview-drop { padding: 22px 14px; min-height: 110px; margin: 12px; }
    .runner-picker { max-width: 360px; }
    .nav-links a:not(.btn) { display: none; }
}

@media (max-width: 768px) {
    .hero-inner-centered h1 { font-size: 34px; }
}

@media (max-width: 480px) {
    .hero h1 { font-size: 26px; }
    .hero-inner-centered h1 { font-size: 28px; }
    .section-title { font-size: 28px; }
}