/* OLPW:css/tools.css | styles for tools */
:root { --bg: #14110F; --surface: #1E1A17; --surface-light: #29231F; --field: #14110F; --text-main: #EDE3D9; --text-strong: #FFFFFF; --text-muted: #A89788; --border: #3A2F28; --accent: #F97316; }
html[data-theme="light"] { --field: #FFFBF6; }
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: 'Inter', system-ui, sans-serif; background: var(--bg); color: var(--text-main); min-height: 100vh; padding-bottom: 90px; }
h1, h2, h3 { font-family: 'Space Grotesk', sans-serif; color: var(--text-strong); }
.wrap { max-width: 980px; margin: 0 auto; padding: 32px 20px; }
.head { display: flex; align-items: center; gap: 14px; margin-bottom: 8px; }
.head img { width: 44px; height: 44px; border-radius: 50%; }
.head h1 { font-size: 30px; }
.sub { color: var(--text-muted); margin-bottom: 24px; }
.tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 22px; }
.tabs button { padding: 10px 16px; border-radius: 999px; border: 1px solid var(--border); background: var(--surface); color: var(--text-main); font: 600 14px 'Inter', sans-serif; cursor: pointer; }
.tabs button:hover { border-color: var(--accent); color: var(--accent); }
.tabs button.on { background: var(--accent); border-color: var(--accent); color: #fff; }
.panel { display: none; background: var(--surface); border: 1px solid var(--border); border-radius: 18px; padding: 24px; box-shadow: 0 12px 30px rgba(120, 72, 30, 0.08); }
.panel.on { display: block; }
.panel h2 { font-size: 22px; margin-bottom: 6px; }
.panel .hint { color: var(--text-muted); font-size: 14px; margin-bottom: 18px; }
input, select, textarea { font: inherit; color: var(--text-main); background: var(--field); border: 1px solid var(--border); border-radius: 10px; padding: 10px 12px; outline: none; }
input:focus, select:focus, textarea:focus { border-color: var(--accent); }
textarea { width: 100%; resize: vertical; line-height: 1.6; }
.btn { padding: 10px 16px; border-radius: 10px; border: 1px solid var(--border); background: var(--surface-light); color: var(--text-main); font: 600 14px 'Inter', sans-serif; cursor: pointer; }
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { filter: brightness(0.95); color: #fff; }
.row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.muted { color: var(--text-muted); font-size: 14px; }
.empty { color: var(--text-muted); padding: 18px 0; }

/* Flashcards */
.fc-add { display: grid; grid-template-columns: 1fr 1fr auto; gap: 10px; margin-bottom: 18px; }
.card3d { perspective: 1000px; margin: 10px auto 16px; max-width: 560px; height: 240px; cursor: pointer; }
.card3d-inner { position: relative; width: 100%; height: 100%; transition: transform 0.5s; transform-style: preserve-3d; }
.card3d.flip .card3d-inner { transform: rotateY(180deg); }
.face { position: absolute; inset: 0; backface-visibility: hidden; border-radius: 16px; display: flex; align-items: center; justify-content: center; text-align: center; padding: 24px; font-size: 20px; font-weight: 600; border: 1px solid var(--border); background: var(--field); color: var(--text-strong); overflow: auto; }
.face.back { transform: rotateY(180deg); background: color-mix(in srgb, var(--accent) 10%, var(--surface)); }
.face small { position: absolute; top: 12px; left: 16px; font-size: 11px; letter-spacing: 1px; text-transform: uppercase; color: var(--text-muted); font-weight: 600; }
.fc-controls { justify-content: center; }
.fc-list { margin-top: 20px; border-top: 1px solid var(--border); padding-top: 14px; max-height: 260px; overflow: auto; }
.fc-item { display: flex; gap: 10px; align-items: center; padding: 8px 0; border-bottom: 1px dashed var(--border); font-size: 14px; }
.fc-item span { flex: 1; }
.fc-item button { background: none; border: none; color: var(--text-muted); cursor: pointer; font-size: 16px; }
.fc-item button:hover { color: #DC2626; }

/* Calculator */
.calc { max-width: 380px; }
.calc-display { width: 100%; text-align: right; font: 600 26px 'Space Grotesk', sans-serif; padding: 14px; margin-bottom: 4px; }
.calc-result { text-align: right; min-height: 22px; color: var(--text-muted); margin-bottom: 12px; font-size: 15px; }
.calc-keys { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; }
.calc-keys button { padding: 13px 0; border-radius: 10px; border: 1px solid var(--border); background: var(--field); color: var(--text-main); font: 600 15px 'Inter', sans-serif; cursor: pointer; }
.calc-keys button:hover { border-color: var(--accent); }
.calc-keys .op { color: var(--accent); }
.calc-keys .eq { background: var(--accent); border-color: var(--accent); color: #fff; }

/* Converter & grades */
.conv { display: grid; grid-template-columns: 1fr auto 1fr; gap: 12px; align-items: end; max-width: 640px; }
.conv label { display: flex; flex-direction: column; gap: 6px; font-size: 13px; color: var(--text-muted); }
.conv .swap { margin-bottom: 2px; }
.big-out { font: 700 28px 'Space Grotesk', sans-serif; color: var(--accent); margin-top: 18px; }
table.grades { width: 100%; border-collapse: collapse; margin: 6px 0 14px; }
table.grades th { text-align: left; font-size: 12px; text-transform: uppercase; letter-spacing: 1px; color: var(--text-muted); padding: 6px; }
table.grades td { padding: 6px; }
table.grades input { width: 100%; }
table.grades td:last-child { width: 40px; }
.grade-summary { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 14px; }
.grade-summary div { flex: 1; min-width: 140px; padding: 14px; border-radius: 12px; background: var(--field); border: 1px solid var(--border); }
.grade-summary b { display: block; font: 700 26px 'Space Grotesk', sans-serif; color: var(--text-strong); }
.grade-summary span { font-size: 12px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; }

/* Notes & counter */
.notes-grid { display: grid; grid-template-columns: 220px 1fr; gap: 16px; }
.note-list { display: flex; flex-direction: column; gap: 6px; max-height: 380px; overflow: auto; }
.note-list button { text-align: left; padding: 10px 12px; border-radius: 10px; border: 1px solid var(--border); background: var(--field); color: var(--text-main); cursor: pointer; font: 500 14px 'Inter', sans-serif; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.note-list button.on { border-color: var(--accent); color: var(--accent); }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 10px; margin-top: 14px; }
.stats div { padding: 12px; border-radius: 12px; background: var(--field); border: 1px solid var(--border); text-align: center; }
.stats b { display: block; font: 700 22px 'Space Grotesk', sans-serif; color: var(--text-strong); }
.stats span { font-size: 12px; color: var(--text-muted); }
@media (max-width: 640px) {
    .fc-add, .conv, .notes-grid { grid-template-columns: 1fr; }
    .conv .swap { justify-self: start; }
}