:root {
	--text: #2C2C2B;
	--text-2: #7D7A75;
	--canvas: #FFFFFF;
	--soft: #F9F8F7;
	--soft-2: #F0EFED;
	--border: #E6E5E3;
	--blue: #2783DE;
	--blue-soft: #E5F2FC;
	--green: #46A171;
	--green-soft: #E8F1EC;
	--orange: #D5803B;
	--orange-soft: #FBEBDE;
	--red: #E56458;
	--red-soft: #FCE9E7;
	--radius: 8px;
}
* { box-sizing: border-box; }
body {
	margin: 0;
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
	font-size: 16px;
	line-height: 1.5;
	color: var(--text);
	background: var(--soft);
}
h1 { font-size: 1.75rem; margin: 0 0 8px; }
h2 { font-size: 1.35rem; margin: 32px 0 12px; }
h3 { font-size: 1.1rem; margin: 0 0 8px; }
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
.muted { color: var(--text-2); }
.small { font-size: 14px; }

.topbar { background: var(--canvas); border-bottom: 1px solid var(--border); }
.topbar-inner {
	max-width: 1060px; margin: 0 auto; padding: 12px 24px;
	display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap;
}
.brand { font-weight: 700; color: var(--text); font-size: 17px; }
.brand:hover { text-decoration: none; }
.nav { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.nav a { color: var(--text-2); font-size: 14px; }
.nav a:hover { color: var(--text); text-decoration: none; }
.nav-user { color: var(--text-2); font-size: 14px; }

.container { max-width: 1060px; margin: 0 auto; padding: 32px 24px 64px; }

.card {
	background: var(--canvas); border: 1px solid var(--border);
	border-radius: var(--radius); padding: 24px; margin-bottom: 16px;
}
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; }
.grid .card { margin-bottom: 0; }

.btn {
	display: inline-block; border: 1px solid var(--border); background: var(--canvas);
	color: var(--text); border-radius: var(--radius); padding: 9px 16px; font-size: 14px;
	cursor: pointer; font-family: inherit;
}
.btn:hover { background: var(--soft); text-decoration: none; }
.btn-primary { background: var(--blue); border-color: var(--blue); color: #fff; }
.btn-primary:hover { background: #1f6fc0; }
.btn-danger { background: var(--red-soft); border-color: var(--red); color: var(--red); }
.btn-small { padding: 5px 12px; font-size: 13px; }
.btn-block { width: 100%; }
.btn-ghost { color: var(--text-2); }

form label { display: block; font-size: 14px; font-weight: 600; margin: 14px 0 4px; }
input[type=text], input[type=email], input[type=password], input[type=number], textarea, select {
	width: 100%; padding: 9px 12px; border: 1px solid var(--border); border-radius: var(--radius);
	font: inherit; font-size: 15px; color: var(--text); background: var(--canvas);
}
input:focus, textarea:focus, select:focus { outline: 2px solid var(--blue-soft); border-color: var(--blue); }
textarea { min-height: 110px; resize: vertical; }
form .btn { margin-top: 16px; }
.inline-form { display: inline; }
.inline-form .btn { margin-top: 0; }

.auth-wrap { display: flex; justify-content: center; padding-top: 48px; }
.auth-card { width: 100%; max-width: 400px; }

.flash {
	background: var(--green-soft); border: 1px solid var(--green); color: #2c6a4a;
	border-radius: var(--radius); padding: 12px 16px; margin-bottom: 20px; font-size: 14px;
}
.alert { border-radius: var(--radius); padding: 12px 16px; margin: 12px 0; font-size: 14px; }
.alert-error { background: var(--red-soft); border: 1px solid var(--red); color: #a13d34; }
.alert-info { background: var(--blue-soft); border: 1px solid var(--blue); color: #1c5c9c; }
.alert-warn { background: var(--orange-soft); border: 1px solid var(--orange); color: #8f5626; }

table.list { width: 100%; border-collapse: collapse; font-size: 14px; }
table.list th {
	text-align: left; color: var(--text-2); font-weight: 600; font-size: 13px;
	padding: 8px 12px; border-bottom: 1px solid var(--border);
}
table.list td { padding: 10px 12px; border-bottom: 1px solid var(--border); vertical-align: top; }
table.list tr:last-child td { border-bottom: none; }
.table-scroll { overflow-x: auto; }

.badge {
	display: inline-block; font-size: 12px; font-weight: 600; border-radius: 999px;
	padding: 2px 10px; margin-right: 4px;
}
.badge-blue { background: var(--blue-soft); color: #1c5c9c; }
.badge-green { background: var(--green-soft); color: #2c6a4a; }
.badge-orange { background: var(--orange-soft); color: #8f5626; }
.badge-gray { background: var(--soft-2); color: var(--text-2); }
.badge-red { background: var(--red-soft); color: #a13d34; }

.progress { background: var(--soft-2); border-radius: 999px; height: 8px; overflow: hidden; margin: 10px 0 6px; }
.progress > span { display: block; height: 100%; background: var(--blue); border-radius: 999px; }

.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 16px; margin-bottom: 24px; }
.stat { background: var(--canvas); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 20px; }
.stat .num { font-size: 28px; font-weight: 700; }
.stat .lbl { color: var(--text-2); font-size: 13px; }

.lesson-row { display: flex; align-items: center; gap: 14px; padding: 14px 0; border-bottom: 1px solid var(--border); }
.lesson-row:last-child { border-bottom: none; }
.lesson-num {
	width: 32px; height: 32px; border-radius: 50%; background: var(--soft-2); color: var(--text-2);
	display: flex; align-items: center; justify-content: center; font-size: 13px; font-weight: 700; flex-shrink: 0;
}
.lesson-num.done { background: var(--green-soft); color: var(--green); }
.lesson-main { flex: 1; min-width: 0; }

.player-wrap {
	position: relative; background: #000; border-radius: var(--radius);
	overflow: hidden; margin-bottom: 20px;
	-webkit-user-select: none; user-select: none;
}
.player-wrap video { display: block; width: 100%; max-height: 70vh; }
.watermark {
	position: absolute; top: 10%; left: 8%; z-index: 5; pointer-events: none;
	color: rgba(255, 255, 255, 0.45); font-size: 13px; font-weight: 600;
	text-shadow: 0 0 4px rgba(0, 0, 0, 0.5);
	transition: top 2.5s ease, left 2.5s ease;
	white-space: nowrap;
}

.breadcrumb { font-size: 13px; color: var(--text-2); margin-bottom: 16px; }
.breadcrumb a { color: var(--text-2); }

.page-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-bottom: 20px; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }

@media (max-width: 640px) {
	.container { padding: 20px 16px 48px; }
	.topbar-inner { padding: 10px 16px; }
	h1 { font-size: 1.4rem; }
}