:root{ --bg:#f6f0e7; --primary:#b57a4b; --primary-dark:#9c663d; --text:#2a1e16; --muted:#6b5b4d; --card:#fffaf4; --border:#e3d5c6; --accent:#c9d8b6; }
body { font-family: system-ui, -apple-system, Segoe UI, Arial, sans-serif; margin: 0; padding: 0; background: var(--bg); color: var(--text); background-image:
	radial-gradient(circle at 20% 20%, rgba(201,216,182,0.28) 0, rgba(201,216,182,0.28) 20%, transparent 35%),
	radial-gradient(circle at 80% 10%, rgba(181,122,75,0.18) 0, rgba(181,122,75,0.18) 18%, transparent 34%),
	linear-gradient(180deg, rgba(255,255,255,0) 0%, rgba(255,255,255,0.35) 55%, rgba(255,255,255,0.65) 100%),
	url("data:image/svg+xml,%3Csvg width='200' height='120' viewBox='0 0 200 120' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M30 82c4-18 20-30 44-34 12-2 24-1 34 3 7-5 18-6 27-1 6 3 10 8 11 14 10 2 17 8 18 17 1 9-4 16-15 18l-87 6c-21 1-35-7-32-23z' fill='%23b57a4b' fill-opacity='0.14'/%3E%3Ccircle cx='62' cy='60' r='6' fill='%232a1e16' fill-opacity='0.18'/%3E%3Ccircle cx='134' cy='53' r='5' fill='%232a1e16' fill-opacity='0.18'/%3E%3Cpath d='M70 70c6 1 10 5 10 9 0 4-5 7-12 7-6 0-10-2-11-6-1-4 4-10 13-10z' fill='%239c663d' fill-opacity='0.12'/%3E%3C/svg%3E");
	background-repeat: no-repeat;
	background-size: cover, cover, cover, 320px auto;
	background-position: center top, right 10% top 8%, center top, 12% 30%; }
.app-header{ position: sticky; top:0; z-index:10; background: var(--card); box-shadow: 0 2px 8px rgba(0,0,0,0.04); }
.navbar{ display:flex; align-items:center; justify-content: space-between; padding: 12px 16px; }
.nav-brand{ color: var(--primary); font-weight: 700; text-decoration:none; }
.nav-links a{ color: var(--text); text-decoration:none; margin-left:12px; }
.container { padding: 16px; max-width: 960px; margin: 0 auto; }
.card{ background: var(--card); border:1px solid var(--border); border-radius:14px; padding:16px; box-shadow: 0 4px 14px rgba(0,0,0,0.04); }
.title{ font-size:22px; margin:0 0 10px; }
.subtitle{ margin: 0 0 8px; font-size: 16px; color: var(--muted); }
.chip{ display:inline-block; padding:2px 8px; border-radius:999px; background: #ffe4ee; color: var(--primary); font-size:12px; margin-right:8px; }
.form { display: grid; grid-template-columns: 1fr; gap: 10px; max-width: 420px; }
.form input { padding: 8px; font-size: 18px; width: 100%; box-sizing: border-box; }
.form .inline-field { display:flex; align-items:center; gap:8px; width:100%; }
.form .inline-field input { flex:1; min-width:0; }
.form button, .btn, .option, button { padding: 10px 14px; font-size: 16px; cursor: pointer; border-radius:12px; border:1px solid var(--border);  }
.btn-compact{ padding:6px 10px; font-size:14px; justify-self:start; width:auto; }
.btn-primary{ background: var(--primary); color:#fff; border-color: var(--primary); }
.btn-primary:hover{ background: var(--primary-dark); }
.btn-link { background: transparent; border: none; color: #0057d9; text-align: left; padding: 4px 0; }
.btn-link:hover { text-decoration: underline; }
.trace-wrap { display: flex; gap: 12px; align-items: flex-start; flex-wrap: wrap; }
.answer-box { min-width: 120px; padding: 8px; border: 1px dashed #bbb; background: #f7f7f7; font-size: 16px; line-height: 1.4; }
.hidden { display: none; }
.hint { color: #666; }
.review-list{ list-style:none; padding:0; margin:12px 0; display:grid; gap:12px; }
.review-item{ display:flex; align-items:center; justify-content:space-between; padding:12px 14px; background:#fff; border:1px solid var(--border); border-radius:14px; box-shadow: 0 2px 8px rgba(0,0,0,0.04); }
.review-meta{ font-size:12px; color: var(--muted); margin-top:4px; }
.table-wrap{ overflow-x: auto; }
.admin-table{ width:100%; border-collapse: collapse; font-size:14px; margin-top:8px; }
.admin-table th, .admin-table td{ border:1px solid var(--border); padding:6px 8px; text-align:left; background:#fff; }
.admin-table th{ background:#fff3f9; color: var(--text); position: sticky; top:0; }
.admin-table input{ width:100%; box-sizing:border-box; padding:6px 8px; font-size:14px; }
/* Ensure checkboxes don't expand and stay left-aligned */
.admin-table input[type="checkbox"]{ width:auto; padding:0; margin:0; display:inline-block; vertical-align:middle; }
.admin-table{ /* allow table to shrink to container without horizontal scroll */ }
.admin-actions{ display:flex; align-items:center; justify-content: space-between; gap:12px; margin-bottom:8px; flex-wrap: wrap; }
.admin-thumb{ width:120px; max-height:120px; object-fit: contain; border:1px solid var(--border); border-radius:8px; background:#fff; }
.trace-stack { position: relative; display: inline-block; }
.stats-layout{ display:grid; grid-template-columns: minmax(0,1.1fr) minmax(0,0.9fr); gap:16px; align-items:center; }
.summary-grid{ display:grid; grid-template-columns: repeat(auto-fit, minmax(120px,1fr)); gap:10px; }
.summary-item{ padding:10px 12px; border:1px solid var(--border); border-radius:12px; background: #fff; box-shadow: 0 3px 10px rgba(0,0,0,0.03); }
.summary-item .label{ font-size:12px; color: var(--muted); margin-bottom:4px; }
.summary-item .value{ font-size:20px; font-weight:700; color: var(--text); }
.summary-item.emphasis{ background: linear-gradient(135deg, #fff3e0, #ffe8cc); border-color: #f1c9a0; }
.summary-item.tone-0{ background:#fff1eb; border-color:#f2c1b0; }
.summary-item.tone-1{ background:#fff5e6; border-color:#f0cf9d; }
.summary-item.tone-2{ background:#fffbe6; border-color:#ecdba0; }
.summary-item.tone-3{ background:#e9f7f3; border-color:#b8dfd2; }
.summary-item.tone-done{ background:#e6eef8; border-color:#b3c7e6; }
.chart-wrap{ background:#fff; border:1px solid var(--border); border-radius:12px; padding:12px; box-shadow: 0 3px 10px rgba(0,0,0,0.03); }
.trace-template { font-size: 118px; color: #888; opacity: 0.55; }
.trace-overlay { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; pointer-events: none; user-select: none; }
.trace-overlay-grid { gap: 16px; display: grid; grid-auto-flow: column; grid-auto-columns: 1fr; }
.trace-overlay-grid .trace-cell { display: flex; flex-direction: column; align-items: center; justify-content: center; }
.trace-overlay-grid .pinyin { font-size: calc(var(--cell-w, 120px) * 0.18); color: #555; line-height: 1.2; }
.trace-overlay-grid .char { font-size: calc(var(--cell-w, 120px) * 0.75); color: #777; opacity: 0.65; line-height: 1; }
#trace-canvas { border: 1px solid #ccc; background: transparent; position: relative; }
.trace-pad { width: 100%; height: auto; display: block; touch-action: none; }
.trace-stack { width: 100%; max-width: 100%; }
.trace-frame { max-width: 100%; }
.trace-frame { border: 1px solid #bbb; background: #fff; box-sizing: border-box; padding: 4px; }
.poem { font-size: 18px; margin-bottom: 8px; color: var(--muted); }
.options { display: grid; grid-template-columns: repeat(3, minmax(72px, 1fr)); gap: 10px; max-width: 420px; }
.options .option{ font-size: 24px; background:#fff; border:1px solid var(--border); border-radius:14px; box-shadow: 0 2px 8px rgba(0,0,0,0.04); }

/* Premium features hero on login */
.features-hero{ margin-top:16px; padding:18px; border-radius:16px; position:relative; overflow:hidden; border:1px solid var(--border); background:
	radial-gradient(1200px 500px at -10% -20%, rgba(181,122,75,0.08) 0, transparent 50%),
	radial-gradient(900px 380px at 110% 10%, rgba(201,216,182,0.22) 0, transparent 55%),
	linear-gradient(180deg, #fffefb, #fffaf4 60%);
	box-shadow: 0 8px 28px rgba(0,0,0,0.05);
}
.features-head{ display:flex; align-items:flex-end; justify-content:space-between; gap:12px; flex-wrap:wrap; margin-bottom:10px; }
.features-title{ margin:0; font-size:20px; letter-spacing: 0.5px; color: var(--text); }
.features-sub{ margin:0; color: var(--muted); font-size:14px; }
.feature-list{ list-style:none; padding:0; margin:8px 0 0; display:grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap:10px; }
.feature-item{ display:flex; align-items:center; gap:10px; padding:10px 12px; background:#fff; border:1px solid var(--border); border-radius:12px; box-shadow: 0 2px 10px rgba(0,0,0,0.03); }
.feature-icon{ width:34px; height:34px; border-radius:50%; display:flex; align-items:center; justify-content:center; background: #fff3e0; border:1px solid #f1c9a0; font-size:18px; }
.feature-text{ display:flex; flex-direction:column; line-height:1.2; }
.feature-text strong{ font-weight:700; font-size:14px; color: var(--text); }
.feature-text span{ font-size:12px; color: var(--muted); }

@media (max-width: 560px){
	.feature-list{ grid-template-columns: 1fr; }
	.features-title{ font-size:18px; }
	/* Larger trace characters on phones */
	.trace-overlay-grid .pinyin { font-size: calc(var(--cell-w, 120px) * 0.26); }
	.trace-overlay-grid .char { font-size: calc(var(--cell-w, 120px) * 1.05); }
}

/* Review list responsive */
.review-item{ gap: 12px; }
@media (max-width: 768px){
	.container { padding: 12px; }
	.navbar{ flex-wrap: wrap; gap: 8px; }
	.review-item{ flex-direction: column; align-items: flex-start; }
	.admin-thumb{ width: 88px; max-height: 88px; }
	.stats-layout{ grid-template-columns: 1fr; }
}
@media (max-width: 480px){
	.title{ font-size: 18px; }
	.trace-overlay-grid { gap: 8px; }
	.options { grid-template-columns: repeat(3, 1fr); }
	.admin-table { font-size: 12px; }
	.admin-table input{ font-size: 12px; }
}