/* =========================================================
   Edupidia — JPG to PDF Converter
   Modern Glassmorphism Theme, Responsive, Dark/Light
   ========================================================= */

:root {
  /* Light theme */
  --bg-1: #eef2ff;
  --bg-2: #f5f3ff;
  --bg-3: #fdf4ff;
  --surface: rgba(255, 255, 255, 0.65);
  --surface-strong: rgba(255, 255, 255, 0.85);
  --border: rgba(255, 255, 255, 0.6);
  --border-strong: rgba(99, 102, 241, 0.25);
  --text: #0f172a;
  --text-muted: #475569;
  --text-soft: #64748b;
  --primary: #6366f1;
  --primary-2: #8b5cf6;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.08), 0 2px 8px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 20px 60px rgba(15, 23, 42, 0.15);
  --radius: 16px;
  --radius-sm: 10px;
  --radius-lg: 24px;
  --blur: 18px;
  --transition: 180ms cubic-bezier(.4,0,.2,1);
  --grad: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);
  --grad-soft: linear-gradient(135deg, rgba(99,102,241,.15), rgba(139,92,246,.15), rgba(236,72,153,.15));
}

[data-theme="dark"] {
  --bg-1: #0b1020;
  --bg-2: #0f172a;
  --bg-3: #1e1b4b;
  --surface: rgba(30, 41, 59, 0.55);
  --surface-strong: rgba(30, 41, 59, 0.85);
  --border: rgba(148, 163, 184, 0.18);
  --border-strong: rgba(129, 140, 248, 0.35);
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --text-soft: #cbd5e1;
  --primary: #818cf8;
  --primary-2: #a78bfa;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35), 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.5);
}

* { box-sizing: border-box; }
html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px; /* sticky navbar ke neeche section title na chhupe */
}
html, body { margin: 0; padding: 0; }
body {
  font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(99,102,241,.25), transparent 60%),
    radial-gradient(900px 500px at 110% 10%, rgba(236,72,153,.18), transparent 60%),
    radial-gradient(800px 500px at 50% 110%, rgba(139,92,246,.22), transparent 60%),
    linear-gradient(180deg, var(--bg-1), var(--bg-2) 40%, var(--bg-3));
  min-height: 100vh;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  transition: background-color .4s ease, color .4s ease;
}
img { max-width: 100%; display: block; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 3px solid var(--primary); outline-offset: 2px; border-radius: 6px; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ===== NAVBAR ===== */
.navbar {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(var(--blur)) saturate(160%);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(160%);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.nav-container {
  max-width: 1200px; margin: 0 auto; padding: 14px 20px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: .2px; }
.logo-mark {
  width: 34px; height: 34px; border-radius: 10px;
  background: var(--grad); color: #fff;
  display: grid; place-items: center; font-weight: 900;
  box-shadow: 0 6px 16px rgba(99,102,241,.35);
}
.logo-text { font-size: 1.15rem; }
.nav-links { display: flex; gap: 22px; }
.nav-links a { color: var(--text-muted); font-weight: 500; }
.nav-links a:hover { color: var(--text); text-decoration: none; }
.nav-actions { display: flex; gap: 8px; }

.icon-btn {
  width: 40px; height: 40px; border-radius: 12px;
  border: 1px solid var(--border); background: var(--surface-strong);
  display: grid; place-items: center; cursor: pointer;
  transition: transform var(--transition), background var(--transition), border-color var(--transition);
}
.icon-btn:hover { transform: translateY(-1px); border-color: var(--border-strong); }
.icon-btn svg { width: 18px; height: 18px; fill: currentColor; }
[data-theme="light"] .icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }

/* ===== HERO ===== */
.hero { padding: 70px 0 40px; text-align: center; }
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  margin: 14px 0 12px;
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -.02em;
}
.hero .lead { max-width: 720px; margin: 0 auto; color: var(--text-muted); font-size: 1.1rem; }
.badge {
  display: inline-block; padding: 6px 14px; border-radius: 999px;
  background: var(--surface-strong); border: 1px solid var(--border);
  font-size: .85rem; font-weight: 600; color: var(--text-muted);
}
.hero-actions { margin-top: 26px; display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 18px; border-radius: 12px;
  border: 1px solid transparent; cursor: pointer;
  font-weight: 600; transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  background: var(--surface-strong); color: var(--text);
}
.btn:hover { transform: translateY(-1px); }
.btn:disabled { opacity: .55; cursor: not-allowed; transform: none; }
.btn-primary { background: var(--grad); color: #fff; box-shadow: 0 8px 20px rgba(99,102,241,.35); }
.btn-primary:hover { box-shadow: 0 12px 28px rgba(99,102,241,.45); }
.btn-ghost { background: transparent; border-color: var(--border); color: var(--text); }
.btn-ghost:hover { background: var(--surface-strong); }
.btn-success { background: linear-gradient(135deg, #10b981, #059669); color: #fff; box-shadow: 0 8px 20px rgba(16,185,129,.35); }
.btn-sm { padding: 7px 12px; font-size: .85rem; border-radius: 10px; }
.btn-lg { padding: 14px 22px; font-size: 1rem; }

/* ===== CARDS ===== */
.card {
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--surface);
  backdrop-filter: blur(var(--blur)) saturate(160%);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(160%);
  box-shadow: var(--shadow);
  padding: 24px;
  margin-bottom: 22px;
}
.card-title { margin: 0 0 16px; font-size: 1.15rem; letter-spacing: -.01em; }
.card-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 12px; }
.card-head .card-title { margin: 0; }
.card-tools { display: flex; gap: 8px; align-items: center; }

.chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 10px; border-radius: 999px;
  background: var(--surface-strong); border: 1px solid var(--border);
  font-size: .82rem; color: var(--text-muted); font-weight: 600;
}

/* ===== UPLOAD ===== */
.drop-zone {
  border: 2px dashed var(--border-strong);
  border-radius: var(--radius);
  padding: 40px 20px; text-align: center;
  background: var(--grad-soft);
  transition: border-color var(--transition), background var(--transition), transform var(--transition);
  cursor: pointer;
}
.drop-zone:hover, .drop-zone.drag-over {
  border-color: var(--primary);
  background: rgba(99,102,241,.12);
  transform: translateY(-2px);
}
.upload-icon { width: 54px; height: 54px; fill: var(--primary); margin-bottom: 10px; }
.drop-text { margin: 6px 0; font-size: 1.05rem; }
.drop-sub { color: var(--text-soft); margin: 4px 0 12px; }
.drop-hint { color: var(--text-soft); font-size: .85rem; margin-top: 14px; }

.progress { margin-top: 16px; }
.progress-bar { height: 8px; border-radius: 999px; background: var(--surface-strong); overflow: hidden; border: 1px solid var(--border); }
.progress-fill { height: 100%; width: 0; background: var(--grad); transition: width .25s ease; }
.progress-text { margin: 8px 0 0; font-size: .85rem; color: var(--text-muted); }

.error-banner {
  margin-top: 14px; padding: 12px 14px; border-radius: 12px;
  background: rgba(239,68,68,.1); border: 1px solid rgba(239,68,68,.35);
  color: #b91c1c; font-size: .9rem;
}
[data-theme="dark"] .error-banner { color: #fecaca; }

/* ===== PREVIEW ===== */
.empty-state { text-align: center; padding: 28px; color: var(--text-muted); }
.preview-grid {
  display: grid; gap: 14px;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
}
.preview-item {
  position: relative; border-radius: 14px; overflow: hidden;
  background: var(--surface-strong); border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition);
  cursor: grab;
  user-select: none;
}
.preview-item:active { cursor: grabbing; }
.preview-item.dragging { opacity: .4; transform: scale(.96); }
.preview-item.drag-target { outline: 2px dashed var(--primary); outline-offset: -2px; }
.preview-thumb {
  aspect-ratio: 1 / 1; width: 100%; object-fit: cover;
  background:
    conic-gradient(#ddd 0 25%, #fff 0 50%, #ddd 0 75%, #fff 0) 0 0/20px 20px;
  transition: transform .3s ease;
}
.preview-meta { padding: 10px 12px; }
.preview-name { font-weight: 600; font-size: .85rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.preview-size { font-size: .75rem; color: var(--text-muted); margin-top: 2px; }
.preview-actions {
  position: absolute; top: 6px; right: 6px; display: flex; gap: 4px;
  opacity: 0; transition: opacity var(--transition);
}
.preview-item:hover .preview-actions, .preview-item:focus-within .preview-actions { opacity: 1; }
.preview-actions button {
  width: 30px; height: 30px; border-radius: 8px;
  background: rgba(15,23,42,.7); color: #fff; border: none; cursor: pointer;
  display: grid; place-items: center;
}
.preview-actions button:hover { background: rgba(15,23,42,.9); }
.preview-actions svg { width: 14px; height: 14px; fill: currentColor; }
.preview-index {
  position: absolute; top: 6px; left: 6px;
  background: rgba(15,23,42,.75); color: #fff;
  padding: 3px 8px; border-radius: 999px; font-size: .72rem; font-weight: 700;
}

.preview-toolbar {
  display: flex; align-items: center; gap: 10px; margin-top: 14px;
  padding-top: 14px; border-top: 1px solid var(--border);
}

/* ===== SETTINGS ===== */
.tool-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 22px; }
@media (max-width: 960px) { .tool-grid { grid-template-columns: 1fr; } }

.setting-group { margin-bottom: 16px; }
.setting-group > label { display: block; font-weight: 600; margin-bottom: 6px; font-size: .92rem; }
.setting-group select,
.setting-group input[type="text"],
.setting-group input[type="number"] {
  width: 100%; padding: 10px 12px; border-radius: 10px;
  background: var(--surface-strong); border: 1px solid var(--border);
  color: var(--text); transition: border-color var(--transition);
}
.setting-group select:focus,
.setting-group input:focus { border-color: var(--primary); }

.seg { display: inline-flex; background: var(--surface-strong); border: 1px solid var(--border); border-radius: 12px; padding: 4px; gap: 4px; }
.seg-btn {
  padding: 8px 14px; border-radius: 8px; border: none; cursor: pointer;
  background: transparent; color: var(--text-muted); font-weight: 600;
  transition: background var(--transition), color var(--transition);
}
.seg-btn.active { background: var(--grad); color: #fff; box-shadow: 0 4px 12px rgba(99,102,241,.35); }

.align-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; max-width: 220px; }
.align-btn {
  padding: 10px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--surface-strong); cursor: pointer; font-size: 1rem;
  transition: all var(--transition);
}
.align-btn.active { background: var(--grad); color: #fff; border-color: transparent; }

.range-labels { display: flex; justify-content: space-between; font-size: .75rem; color: var(--text-muted); margin-top: 4px; }
input[type="range"] {
  width: 100%; -webkit-appearance: none; appearance: none;
  height: 6px; border-radius: 999px; background: var(--surface-strong);
  border: 1px solid var(--border);
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--grad); cursor: pointer; border: 2px solid #fff;
  box-shadow: 0 2px 6px rgba(0,0,0,.2);
}
input[type="range"]::-moz-range-thumb {
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--primary); cursor: pointer; border: 2px solid #fff;
}

.color-row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.color-swatch {
  width: 36px; height: 36px; border-radius: 10px; cursor: pointer;
  border: 2px solid var(--border); position: relative; overflow: hidden;
  transition: transform var(--transition), border-color var(--transition);
}
.color-swatch.active { border-color: var(--primary); transform: scale(1.05); }
.color-swatch .checker {
  position: absolute; inset: 0;
  background:
    conic-gradient(#bbb 0 25%, #fff 0 50%, #bbb 0 75%, #fff 0) 0 0/12px 12px;
}
.color-custom {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 10px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--surface-strong); cursor: pointer; font-size: .85rem;
}
.color-custom input { width: 22px; height: 22px; border: none; background: transparent; cursor: pointer; padding: 0; }

.custom-margin {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; margin-top: 8px;
}
.custom-margin label { font-size: .82rem; color: var(--text-muted); display: flex; flex-direction: column; gap: 4px; }
.custom-margin input { padding: 8px 10px; border-radius: 8px; border: 1px solid var(--border); background: var(--surface-strong); }

.details { border: 1px solid var(--border); border-radius: 12px; padding: 10px 14px; background: var(--surface-strong); }
.details summary { cursor: pointer; font-weight: 600; }
.meta-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; margin-top: 10px; }
.meta-grid label { display: flex; flex-direction: column; gap: 4px; font-size: .82rem; color: var(--text-muted); }
.meta-grid input { padding: 8px 10px; border-radius: 8px; border: 1px solid var(--border); background: var(--surface); color: var(--text); }

.filename-row { display: flex; align-items: stretch; gap: 0; }
.filename-row input { border-top-right-radius: 0; border-bottom-right-radius: 0; flex: 1; }
.filename-row .ext {
  padding: 10px 14px; background: var(--surface-strong); border: 1px solid var(--border);
  border-left: none; border-radius: 0 10px 10px 0; color: var(--text-muted); font-weight: 600;
}

/* ===== LIVE PREVIEW ===== */
.live-preview {
  display: grid; gap: 16px;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  padding: 10px;
}
.page-preview {
  background: #fff; border: 1px solid var(--border);
  border-radius: 10px; box-shadow: var(--shadow);
  position: relative; overflow: hidden;
  aspect-ratio: var(--page-ratio, 1/1.414);
  display: flex; align-items: center; justify-content: center;
}
.page-preview canvas { max-width: 100%; max-height: 100%; display: block; }
.page-preview .page-num {
  position: absolute; font-size: .65rem; color: #334155;
  background: rgba(255,255,255,.8); padding: 2px 6px; border-radius: 4px;
}
.page-preview .page-num.tl { top: 4px; left: 4px; }
.page-preview .page-num.tc { top: 4px; left: 50%; transform: translateX(-50%); }
.page-preview .page-num.tr { top: 4px; right: 4px; }
.page-preview .page-num.bl { bottom: 4px; left: 4px; }
.page-preview .page-num.bc { bottom: 4px; left: 50%; transform: translateX(-50%); }
.page-preview .page-num.br { bottom: 4px; right: 4px; }

/* ===== CONVERT ===== */
.convert-row { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.convert-info { display: flex; flex-direction: column; gap: 4px; }
.convert-info strong { font-size: 1.1rem; }
.convert-info span { color: var(--text-muted); font-size: .9rem; }
.convert-actions { display: flex; gap: 10px; flex-wrap: wrap; }

.spinner {
  width: 16px; height: 16px; border-radius: 50%;
  border: 2px solid rgba(255,255,255,.4); border-top-color: #fff;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== SECTIONS ===== */
.section { padding: 70px 0; }
.section.alt { background: linear-gradient(180deg, transparent, rgba(99,102,241,.05), transparent); }
.section-title { text-align: center; font-size: clamp(1.6rem, 3.5vw, 2.2rem); margin: 0 0 30px; letter-spacing: -.02em; }

.features-grid { display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.feature {
  padding: 22px; border-radius: var(--radius);
  background: var(--surface); border: 1px solid var(--border);
  backdrop-filter: blur(var(--blur)); -webkit-backdrop-filter: blur(var(--blur));
  transition: transform var(--transition), box-shadow var(--transition);
}
.feature:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.feature-icon { font-size: 1.8rem; margin-bottom: 8px; }
.feature h3 { margin: 0 0 6px; }
.feature p { margin: 0; color: var(--text-muted); font-size: .95rem; }

.faq-list { max-width: 820px; margin: 0 auto; display: grid; gap: 10px; }
.faq-item {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 12px; padding: 14px 18px;
  backdrop-filter: blur(var(--blur)); -webkit-backdrop-filter: blur(var(--blur));
}
.faq-item summary { cursor: pointer; font-weight: 600; }
.faq-item p { margin: 10px 0 0; color: var(--text-muted); }

.about p { max-width: 820px; margin: 0 auto; color: var(--text-muted); text-align: center; }

/* ===== FOOTER ===== */
.footer { padding: 30px 0; text-align: center; border-top: 1px solid var(--border); margin-top: 30px; }
.footer p { margin: 4px 0; }
.muted { color: var(--text-muted); font-size: .85rem; }

/* ===== MODALS ===== */
.modal {
  position: fixed; inset: 0; z-index: 100;
  display: flex; align-items: center; justify-content: center;
  padding: 20px;
}
.modal[hidden] { display: none; }
.modal-backdrop {
  position: absolute; inset: 0;
  background: rgba(15,23,42,.6); backdrop-filter: blur(6px);
}
.modal-content {
  position: relative; z-index: 1;
  background: var(--surface-strong); border: 1px solid var(--border);
  border-radius: var(--radius-lg); box-shadow: var(--shadow-lg);
  max-width: 95vw; max-height: 92vh; overflow: auto;
  padding: 20px;
  animation: pop .2s ease;
}
@keyframes pop { from { transform: scale(.96); opacity: 0; } to { transform: scale(1); opacity: 1; } }
.modal-close {
  position: absolute; top: 12px; right: 12px; z-index: 2;
  width: 36px; height: 36px; border-radius: 10px; border: none;
  background: rgba(15,23,42,.7); color: #fff; cursor: pointer; font-size: 1rem;
}

.fullscreen-content { width: min(900px, 95vw); }
.fs-toolbar { display: flex; align-items: center; justify-content: center; gap: 12px; margin-bottom: 10px; }
.fs-stage {
  background:
    conic-gradient(#ddd 0 25%, #fff 0 50%, #ddd 0 75%, #fff 0) 0 0/20px 20px;
  border-radius: 12px; padding: 10px; display: grid; place-items: center;
  max-height: 70vh; overflow: auto;
}
.fs-stage img { max-width: 100%; max-height: 70vh; border-radius: 6px; }

.crop-content { width: min(780px, 95vw); }
.modal-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px; }
.modal-head h3 { margin: 0; }
.crop-toolbar { display: flex; gap: 12px; align-items: center; margin-bottom: 10px; flex-wrap: wrap; }
.toggle { display: inline-flex; align-items: center; gap: 6px; font-size: .9rem; }
.crop-stage {
  position: relative; background: #111; border-radius: 12px; overflow: hidden;
  display: grid; place-items: center; min-height: 280px;
}
#cropCanvas { max-width: 100%; max-height: 60vh; display: block; cursor: crosshair; touch-action: none; }
.crop-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 14px; }

/* ===== TOAST ===== */
.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  padding: 12px 18px; border-radius: 12px;
  background: var(--surface-strong); border: 1px solid var(--border);
  box-shadow: var(--shadow-lg); z-index: 200;
  font-weight: 600;
  animation: slideUp .25s ease;
}
.toast.success { border-color: var(--success); color: var(--success); }
.toast.error { border-color: var(--danger); color: var(--danger); }
@keyframes slideUp { from { opacity: 0; transform: translate(-50%, 10px); } to { opacity: 1; transform: translate(-50%, 0); } }

/* ===== RESPONSIVE ===== */
@media (max-width: 720px) {
  .nav-links { display: none; }
  .hero { padding: 50px 0 20px; }
  .card { padding: 18px; }
  .preview-grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); }
  .meta-grid { grid-template-columns: 1fr; }
  .custom-margin { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .preview-grid { grid-template-columns: repeat(2, 1fr); }
  .seg { width: 100%; }
  .seg-btn { flex: 1; text-align: center; padding: 8px 6px; font-size: .85rem; }
}

/* ===== ACCESSIBILITY ===== */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}
@media (prefers-contrast: more) {
  :root { --border: rgba(15,23,42,.6); }
  [data-theme="dark"] { --border: rgba(226,232,240,.6); }
}