:root {
    color-scheme: dark;
    --bg: #10131b;
    --surface: #191e29;
    --surface-raised: #202735;
    --text: #f4f6fb;
    --muted: #a5afc0;
    --line: #303949;
    --accent: #a5f36b;
    --accent-dark: #16240e;
    --notice: #1c2a25;
    --radius: 18px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font: 16px/1.65 Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
}
a { color: inherit; }
.site-header, main, .site-footer { width: min(100% - 40px, 1040px); margin-inline: auto; }
.site-header {
    min-height: 78px; display: flex; justify-content: space-between; align-items: center;
    border-bottom: 1px solid var(--line);
}
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-size: 1.05rem; letter-spacing: -.025em; }
.brand strong { color: var(--accent); }
.brand-mark { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 11px; background: var(--accent); color: var(--accent-dark); font-weight: 900; }
.privacy-label { display: inline-flex; align-items: center; gap: 9px; color: var(--muted); font-size: .82rem; }
.privacy-label span { color: var(--accent); font-size: .65rem; }
main { min-height: 70vh; }
.hero { max-width: 770px; margin: 78px auto 52px; text-align: center; }
.hero-platform { margin-top: 40px; }
.eyebrow { margin: 0 0 12px; color: var(--accent); font-size: .75rem; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; }
h1, h2, p { margin-top: 0; }
h1 { margin-bottom: 20px; font-size: clamp(2.5rem, 7vw, 4.5rem); line-height: 1.05; letter-spacing: -.065em; }
h1 span { color: var(--accent); }
.hero-copy { max-width: 660px; margin: 0 auto 27px; color: var(--muted); font-size: clamp(1rem, 2.3vw, 1.2rem); }
.button { display: inline-flex; justify-content: center; align-items: center; gap: 12px; min-height: 48px; padding: 0 21px; border-radius: 12px; font-weight: 800; text-decoration: none; }
.button-primary { background: var(--accent); color: var(--accent-dark); }
.button-primary:hover { filter: brightness(1.06); transform: translateY(-1px); }
.fine-print { margin: 14px 0 0; color: var(--muted); font-size: .8rem; }
.ranking-context { margin: -36px 0 70px; color: var(--muted); font-size: .78rem; }
.notice { display: flex; align-items: flex-start; gap: 14px; margin: 0 0 75px; padding: 20px 22px; border: 1px solid #345241; border-radius: 14px; background: var(--notice); color: #d4e1d7; font-size: .93rem; }
.notice p { margin: 0; }
.notice strong { color: var(--accent); }
.notice-icon { flex: none; display: grid; place-items: center; width: 23px; height: 23px; border: 1px solid var(--accent); border-radius: 50%; color: var(--accent); font-size: .8rem; font-weight: 800; }
.tool-section, .platform-section, .guide-section, .faq-section { margin-bottom: 82px; }
.section-heading { margin-bottom: 25px; }
.section-heading h2, .guide-section h2, .faq-section h2 { margin-bottom: 8px; font-size: clamp(1.65rem, 4vw, 2.35rem); line-height: 1.2; letter-spacing: -.04em; }
.section-heading > p:last-child { margin-bottom: 0; color: var(--muted); }
.dropzone { position: relative; display: flex; min-height: 180px; flex-direction: column; align-items: center; justify-content: center; gap: 8px; padding: 25px; border: 1px dashed #596579; border-radius: var(--radius); background: var(--surface); text-align: center; cursor: pointer; transition: border-color .18s, background .18s; }
.dropzone:hover, .dropzone:focus-within { border-color: var(--accent); background: var(--surface-raised); }
.dropzone input { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0; cursor: pointer; }
.upload-icon { display: grid; place-items: center; width: 38px; height: 38px; margin-bottom: 2px; border-radius: 12px; background: var(--accent); color: var(--accent-dark); font-size: 1.4rem; font-weight: 800; }
.drop-title { font-weight: 800; }
.drop-hint, .file-status { color: var(--muted); font-size: .85rem; }
.file-status { min-height: 22px; margin: 14px 0; }
.file-list { display: grid; gap: 10px; margin: 0; padding: 0; list-style: none; }
.file-list li { display: flex; justify-content: space-between; align-items: center; gap: 20px; padding: 13px 16px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }
.file-list li > span { min-width: 0; }
.file-list strong, .file-list small { display: block; overflow-wrap: anywhere; }
.file-list small { color: var(--muted); font-size: .77rem; }
.file-list a { flex: none; color: var(--accent); font-size: .88rem; font-weight: 800; }
.platform-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; margin: 0; padding: 0; list-style: none; }
.platform-grid a { display: flex; justify-content: space-between; align-items: center; min-height: 52px; gap: 12px; padding: 12px 15px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); font-size: .9rem; text-decoration: none; transition: border-color .18s, background .18s; }
.platform-grid a:hover { border-color: var(--accent); background: var(--surface-raised); }
.platform-grid a span:last-child { color: var(--accent); }
.guide-section { padding: 30px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.steps { display: grid; gap: 19px; margin: 25px 0 0; padding: 0; list-style: none; }
.steps li { display: flex; gap: 15px; }
.steps li > span { flex: none; display: grid; place-items: center; width: 30px; height: 30px; border-radius: 9px; background: var(--accent); color: var(--accent-dark); font-weight: 900; }
.steps strong { display: block; margin-bottom: 3px; }
.steps p { margin: 0; color: var(--muted); font-size: .9rem; }
.faq-section details { padding: 17px 0; border-bottom: 1px solid var(--line); }
.faq-section summary { font-weight: 750; cursor: pointer; }
.faq-section details p { margin: 11px 0 0; color: var(--muted); }
.breadcrumbs { display: flex; gap: 10px; margin-top: 30px; color: var(--muted); font-size: .85rem; }
.breadcrumbs a { color: var(--accent); }
.not-found { max-width: 680px; margin: 100px auto; text-align: center; }
.not-found h1 { font-size: clamp(2.2rem, 6vw, 3.5rem); }
.not-found p:not(.eyebrow) { color: var(--muted); }
.site-footer { display: grid; gap: 14px; padding: 30px 0 35px; border-top: 1px solid var(--line); color: var(--muted); font-size: .82rem; }
.site-footer .brand { width: fit-content; color: var(--text); }
.site-footer p { max-width: 670px; margin: 0; }
.copyright { font-size: .76rem; }
@media (max-width: 720px) {
    .site-header, main, .site-footer { width: min(100% - 30px, 1040px); }
    .site-header { min-height: 68px; }
    .privacy-label { max-width: 135px; text-align: right; font-size: .72rem; }
    .hero { margin: 58px auto 40px; }
    .notice { margin-bottom: 58px; padding: 17px; }
    .platform-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .guide-section { padding: 23px 19px; }
}
@media (max-width: 420px) {
    .platform-grid { grid-template-columns: 1fr; }
    .file-list li { align-items: flex-start; flex-direction: column; gap: 8px; }
}
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; }
}