/* ── Theme ──────────────────────────────────────────────────────── */
:root {
  --primary:    #f97316;
  --secondary:  #ea580c;
  --grad:       linear-gradient(135deg,#f97316,#ea580c);
  --bg:         #0f0f14;
  --bg-card:    #1e1e28;
  --bg-surface: #18181f;
  --text:       #e8e8f0;
  --text-muted: #a0a0b8;
  --text-faint: #636380;
  --border:        rgba(255,255,255,.07);
  --border-medium: rgba(255,255,255,.12);
  --radius:    14px;
  --radius-sm:  8px;
  --font: 'Inter', system-ui, -apple-system, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body { background: var(--bg); color: var(--text); font-family: var(--font); line-height: 1.7; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
code { background: rgba(255,255,255,.07); border-radius: 4px; padding: 1px 5px; font-size: .88em; font-family: 'JetBrains Mono','Fira Code',monospace; color: #fdba74; }
img { display: block; max-width: 100%; }
button { cursor: pointer; border: none; font-family: inherit; }

/* ── Header ──────────────────────────────────────────────────────── */
.site-header { background: rgba(15,15,20,.92); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 100; }
.header-inner { max-width: 1140px; margin: 0 auto; padding: 0 20px; height: 62px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.logo { display: flex; align-items: center; gap: 9px; text-decoration: none; }
.logo-icon { width: 32px; height: 32px; flex-shrink: 0; }
.logo-text { font-size: 1.05rem; font-weight: 700; color: var(--text); }
.main-nav { display: flex; align-items: center; gap: 4px; }
.nav-link { padding: 6px 12px; border-radius: var(--radius-sm); font-size: .88rem; font-weight: 500; color: var(--text-muted); transition: color .15s, background .15s; }
.nav-link:hover, .nav-link.active { color: var(--text); background: rgba(255,255,255,.06); }

/* ── Layout ──────────────────────────────────────────────────────── */
.main-wrap { max-width: 1140px; margin: 0 auto; padding: 28px 20px 80px; }
.ad-slot { background: var(--bg-surface); border: 1px dashed var(--border-medium); border-radius: var(--radius-sm); min-height: 90px; display: flex; align-items: center; justify-content: center; margin: 18px 0; color: var(--text-faint); font-size: .78rem; }

/* ── Hero ────────────────────────────────────────────────────────── */
.tool-hero { text-align: center; padding: 20px 0 28px; }
.tool-badge { display: inline-flex; align-items: center; gap: 6px; padding: 5px 13px; border-radius: 20px; background: rgba(249,115,22,.12); color: var(--primary); font-size: .72rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; margin-bottom: 14px; }
.tool-title { font-size: clamp(1.8rem,4vw,2.6rem); font-weight: 800; line-height: 1.2; margin-bottom: 12px; }
.gradient-title { background: var(--grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.tool-subtitle { font-size: 1rem; color: var(--text-muted); max-width: 620px; margin: 0 auto; }

/* ── Upload zone ─────────────────────────────────────────────────── */
.upload-zone { border: 2px dashed var(--border-medium); border-radius: var(--radius); padding: 40px 24px; text-align: center; cursor: pointer; transition: border-color .2s, background .2s; background: var(--bg-surface); }
.upload-zone:hover, .upload-zone.drag-over { border-color: var(--primary); background: rgba(249,115,22,.04); }
.upload-icon { width: 56px; height: 56px; margin: 0 auto 16px; background: rgba(249,115,22,.12); border-radius: 14px; display: flex; align-items: center; justify-content: center; }
.upload-icon svg { width: 28px; height: 28px; color: var(--primary); }
.upload-title { font-size: 1.1rem; font-weight: 700; color: var(--text); margin-bottom: 6px; }
.upload-sub { font-size: .84rem; color: var(--text-faint); margin-bottom: 20px; line-height: 1.5; }
.upload-actions { display: flex; align-items: center; justify-content: center; gap: 10px; flex-wrap: wrap; }
.btn-upload { display: inline-block; padding: 10px 24px; background: var(--grad); color: #fff; border-radius: var(--radius-sm); font-size: .9rem; font-weight: 700; cursor: pointer; transition: opacity .15s; }
.btn-upload:hover { opacity: .87; }
.upload-note { font-size: .76rem; color: var(--text-faint); margin-top: 14px; }

/* ── Editor layout ───────────────────────────────────────────────── */
.editor-wrap { display: grid; grid-template-columns: 1fr 280px; gap: 20px; }
@media (max-width: 860px) { .editor-wrap { grid-template-columns: 1fr; } }

/* ── Toolbar ─────────────────────────────────────────────────────── */
.toolbar { display: flex; align-items: center; gap: 8px; margin-bottom: 14px; flex-wrap: wrap; }
.pdf-info { display: flex; align-items: center; gap: 8px; flex: 1; min-width: 0; }
.pdf-name { font-size: .88rem; font-weight: 600; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 300px; }
.pdf-meta { font-size: .75rem; color: var(--text-faint); white-space: nowrap; }

/* ── Pages grid ──────────────────────────────────────────────────── */
.pages-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 12px; }

.page-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-sm); overflow: hidden; transition: border-color .15s; position: relative; }
.page-card:hover { border-color: var(--border-medium); }
.page-card.selected { border-color: var(--primary); background: rgba(249,115,22,.04); }

.page-thumb { background: #090910; display: flex; align-items: center; justify-content: center; min-height: 200px; position: relative; overflow: hidden; }
.page-thumb img { max-width: 100%; max-height: 260px; object-fit: contain; display: block; }
.page-thumb-placeholder { display: flex; flex-direction: column; align-items: center; gap: 8px; color: var(--text-faint); font-size: .78rem; padding: 24px; }
.page-thumb-placeholder svg { width: 32px; height: 32px; opacity: .4; }

.page-num-badge { position: absolute; top: 7px; left: 7px; background: rgba(0,0,0,.7); color: var(--text-muted); font-size: .7rem; font-weight: 700; padding: 2px 7px; border-radius: 10px; }

.page-footer { padding: 8px 10px; display: flex; align-items: center; justify-content: space-between; gap: 6px; }
.page-dims { font-size: .7rem; color: var(--text-faint); }
.page-dl-btn { display: flex; align-items: center; gap: 4px; padding: 5px 9px; background: rgba(249,115,22,.1); border: 1px solid rgba(249,115,22,.25); color: var(--primary); border-radius: 6px; font-size: .72rem; font-weight: 700; transition: background .15s; }
.page-dl-btn:hover { background: rgba(249,115,22,.2); }
.page-dl-btn:disabled { opacity: .4; cursor: not-allowed; }

.page-select-wrap { position: absolute; top: 7px; right: 7px; }
.page-checkbox { width: 16px; height: 16px; accent-color: var(--primary); cursor: pointer; }

/* ── Settings panel ──────────────────────────────────────────────── */
.settings-panel { display: flex; flex-direction: column; gap: 12px; }
.settings-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.settings-head { padding: 12px 16px; border-bottom: 1px solid var(--border); font-size: .78rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--text-faint); }
.settings-body { padding: 14px 16px; }

/* Format tabs */
.format-tabs { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.format-tab { padding: 9px; background: none; border: 1px solid var(--border-medium); border-radius: var(--radius-sm); font-size: .85rem; font-weight: 600; color: var(--text-muted); transition: all .15s; }
.format-tab.active { background: rgba(249,115,22,.12); border-color: rgba(249,115,22,.4); color: var(--primary); }
.format-tab:hover:not(.active) { border-color: var(--primary); color: var(--primary); }

/* Scale select */
.scale-select { width: 100%; background: var(--bg-surface); border: 1px solid var(--border-medium); color: var(--text); border-radius: var(--radius-sm); padding: 9px 12px; font-size: .86rem; font-family: inherit; appearance: none; cursor: pointer; }
.scale-select:focus { outline: none; border-color: var(--primary); }
.select-wrap { position: relative; }
.select-wrap::after { content: '▾'; position: absolute; right: 10px; top: 50%; transform: translateY(-50%); color: var(--text-faint); pointer-events: none; font-size: .8rem; }

/* Quality */
.quality-row { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.quality-val   { font-size: 1.4rem; font-weight: 800; color: var(--primary); min-width: 40px; }
.quality-badge { font-size: .72rem; font-weight: 700; padding: 2px 8px; border-radius: 8px; background: rgba(249,115,22,.12); color: var(--primary); }
.quality-range { -webkit-appearance: none; appearance: none; width: 100%; height: 5px; border-radius: 3px; background: rgba(255,255,255,.1); outline: none; cursor: pointer; margin: 8px 0; }
.quality-range::-webkit-slider-thumb { -webkit-appearance: none; width: 18px; height: 18px; border-radius: 50%; background: var(--primary); cursor: pointer; box-shadow: 0 1px 4px rgba(0,0,0,.3); }
.quality-range::-moz-range-thumb { width: 18px; height: 18px; border-radius: 50%; background: var(--primary); cursor: pointer; border: none; }
.quality-hints { display: flex; justify-content: space-between; font-size: .65rem; color: var(--text-faint); }

/* Buttons */
.btn-outline-sm { display: inline-flex; align-items: center; gap: 6px; padding: 7px 13px; border: 1px solid var(--border-medium); border-radius: var(--radius-sm); background: none; font-size: .82rem; font-weight: 500; color: var(--text-muted); transition: border-color .15s, color .15s; }
.btn-outline-sm:hover { border-color: var(--primary); color: var(--primary); }
.btn-primary { display: flex; align-items: center; justify-content: center; gap: 8px; width: 100%; padding: 12px; background: var(--grad); color: #fff; border-radius: var(--radius-sm); font-size: .92rem; font-weight: 700; border: none; transition: opacity .15s; }
.btn-primary:hover:not(:disabled) { opacity: .87; }
.btn-primary:disabled { opacity: .45; cursor: not-allowed; }
.btn-secondary { display: flex; align-items: center; justify-content: center; gap: 7px; width: 100%; padding: 10px; background: none; border: 1px solid var(--border-medium); border-radius: var(--radius-sm); color: var(--text-muted); font-size: .86rem; font-weight: 600; transition: border-color .15s, color .15s; }
.btn-secondary:hover:not(:disabled) { border-color: var(--primary); color: var(--primary); }
.btn-secondary:disabled { opacity: .4; cursor: not-allowed; }
.btn-zip { display: flex; align-items: center; justify-content: center; gap: 7px; width: 100%; padding: 10px; background: rgba(249,115,22,.1); border: 1px solid rgba(249,115,22,.25); border-radius: var(--radius-sm); color: var(--primary); font-size: .86rem; font-weight: 700; transition: background .15s, border-color .15s; }
.btn-zip:hover:not(:disabled) { background: rgba(249,115,22,.18); border-color: rgba(249,115,22,.4); }
.btn-zip:disabled { opacity: .4; cursor: not-allowed; }

/* Progress bar */
.progress-bar-wrap { background: rgba(255,255,255,.06); border-radius: 4px; height: 6px; overflow: hidden; margin-top: 8px; }
.progress-bar { height: 100%; background: var(--grad); border-radius: 4px; transition: width .3s; }
.progress-label { font-size: .75rem; color: var(--text-faint); margin-top: 5px; text-align: center; }

/* Spinner */
.spinner { width: 16px; height: 16px; border-radius: 50%; border: 2px solid rgba(255,255,255,.25); border-top-color: #fff; animation: spin .7s linear infinite; flex-shrink: 0; }
.spinner-lg { width: 28px; height: 28px; border-width: 3px; border-color: rgba(249,115,22,.25); border-top-color: var(--primary); }
@keyframes spin { to { transform: rotate(360deg); } }

/* Info box */
.info-box { padding: 10px 12px; background: rgba(249,115,22,.07); border: 1px solid rgba(249,115,22,.2); border-radius: var(--radius-sm); font-size: .78rem; color: var(--text-muted); line-height: 1.5; }
.info-box strong { color: var(--text); }

/* Setting label/hint */
.setting-label { font-size: .8rem; font-weight: 600; color: var(--text-muted); margin-bottom: 7px; display: block; }
.setting-hint  { font-size: .72rem; color: var(--text-faint); margin-top: 5px; }

/* Selection summary */
.sel-summary { font-size: .78rem; color: var(--text-faint); text-align: center; padding: 4px 0; }
.sel-summary strong { color: var(--primary); }

/* ── SEO Sections ────────────────────────────────────────────────── */
.page-section { max-width: 100%; }
.section-head { text-align: center; margin-bottom: 28px; }
.section-title { font-size: clamp(1.2rem,2.5vw,1.55rem); font-weight: 700; color: #fff; margin-bottom: 8px; }
.section-desc  { font-size: .92rem; color: var(--text-muted); max-width: 600px; margin: 0 auto; }
.section-divider { border: none; border-top: 1px solid var(--border); margin: 40px 0; }

.features-grid { display: grid; grid-template-columns: repeat(auto-fill,minmax(250px,1fr)); gap: 14px; }
.feature-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; }
.feature-icon { font-size: 1.6rem; margin-bottom: 10px; }
.feature-title { font-size: .95rem; font-weight: 700; color: #fff; margin-bottom: 6px; }
.feature-desc  { font-size: .83rem; color: var(--text-muted); line-height: 1.6; }

.steps-grid { display: flex; flex-direction: column; gap: 14px; }
.step-card { display: flex; align-items: flex-start; gap: 16px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 20px; }
.step-number { width: 34px; height: 34px; border-radius: 50%; background: var(--grad); color: #fff; display: flex; align-items: center; justify-content: center; font-size: .88rem; font-weight: 800; flex-shrink: 0; }
.step-title { font-size: .95rem; font-weight: 700; color: #fff; margin-bottom: 4px; }
.step-desc  { font-size: .84rem; color: var(--text-muted); }

.logic-grid { display: grid; grid-template-columns: repeat(auto-fill,minmax(300px,1fr)); gap: 14px; }
.logic-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; border-left: 3px solid var(--primary); }
.logic-title { font-size: .9rem; font-weight: 700; color: var(--primary); margin-bottom: 8px; }
.logic-desc  { font-size: .83rem; color: var(--text-muted); line-height: 1.65; }

.faq-list { display: flex; flex-direction: column; gap: 8px; }
.faq-item { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-sm); overflow: hidden; }
.faq-q { width: 100%; padding: 15px 18px; background: none; color: var(--text); font-size: .92rem; font-weight: 600; text-align: left; display: flex; justify-content: space-between; align-items: center; gap: 12px; transition: background .15s; }
.faq-q:hover { background: rgba(255,255,255,.03); }
.faq-icon { font-size: 1.1rem; color: var(--primary); flex-shrink: 0; transition: transform .2s; }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .3s ease; }
.faq-a p { padding: 0 18px 16px; font-size: .88rem; color: var(--text-muted); line-height: 1.7; }
.faq-item.open .faq-a  { max-height: 600px; }
.faq-item.open .faq-icon { transform: rotate(45deg); }

.related-grid { display: grid; grid-template-columns: repeat(auto-fill,minmax(220px,1fr)); gap: 12px; }
.related-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; display: flex; flex-direction: column; gap: 8px; transition: border-color .15s; }
.related-card:hover { border-color: var(--primary); text-decoration: none; }
.related-icon { width: 40px; height: 40px; border-radius: 10px; display: flex; align-items: center; justify-content: center; }
.related-icon svg { width: 18px; height: 18px; color: #fff; }
.related-name { font-size: .9rem; font-weight: 700; color: var(--text); }
.related-desc { font-size: .78rem; color: var(--text-muted); flex: 1; }
.related-link { font-size: .78rem; color: var(--primary); font-weight: 600; }

/* ── Toast ───────────────────────────────────────────────────────── */
.toast { position: fixed; bottom: 28px; left: 50%; transform: translateX(-50%) translateY(20px); background: #1a1a28; border: 1px solid rgba(249,115,22,.35); color: var(--text); padding: 10px 20px; border-radius: 8px; font-size: .88rem; font-weight: 500; opacity: 0; transition: opacity .2s, transform .2s; pointer-events: none; z-index: 999; }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ── Footer ──────────────────────────────────────────────────────── */
.site-footer { background: var(--bg-card); border-top: 1px solid var(--border); padding: 44px 20px 28px; }
.footer-grid { max-width: 1140px; margin: 0 auto; display: grid; grid-template-columns: 2fr repeat(3,1fr); gap: 32px; margin-bottom: 36px; }
@media (max-width: 700px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
.footer-brand-text { font-size: .82rem; color: var(--text-faint); margin-top: 10px; }
.footer-heading { font-size: .72rem; font-weight: 700; text-transform: uppercase; letter-spacing: .1em; color: var(--text-faint); margin-bottom: 12px; }
.footer-links { display: flex; flex-direction: column; gap: 8px; }
.footer-links a { font-size: .85rem; color: var(--text-muted); }
.footer-links a:hover { color: var(--text); }
.footer-bottom { max-width: 1140px; margin: 0 auto; padding-top: 20px; border-top: 1px solid var(--border); display: flex; justify-content: space-between; font-size: .78rem; color: var(--text-faint); flex-wrap: wrap; gap: 8px; }