/* mysaber-web — shared styles, no frameworks, CSP-safe. */

:root {
	--bg: #0a0d13;
	--bg-soft: #0f131c;
	--card: rgba(255, 255, 255, 0.03);
	--card-solid: #121722;
	--border: #232a38;
	--border-soft: #1a2030;
	--text: #e8ecf3;
	--muted: #8b96a8;
	--cyan: #4cc9f0;
	--pink: #ef4a7b;
	--grad: linear-gradient(92deg, var(--cyan), var(--pink));
	--ring: rgba(76, 201, 240, 0.45);
	--radius: 14px;
	--shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
}

* { box-sizing: border-box; }

html { color-scheme: dark; }

body {
	margin: 0;
	min-height: 100vh;
	display: flex;
	flex-direction: column;
	background:
		radial-gradient(60rem 30rem at 85% -10%, rgba(239, 74, 123, 0.09), transparent 60%),
		radial-gradient(50rem 28rem at 0% -10%, rgba(76, 201, 240, 0.11), transparent 60%),
		var(--bg);
	color: var(--text);
	font: 400 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
	-webkit-font-smoothing: antialiased;
}

.container {
	width: min(100% - 2.5rem, 62rem);
	margin-inline: auto;
}

main.container {
	flex: 1;
	padding-bottom: 4rem;
}

/* ---------- header / footer ---------- */

.site-header {
	position: sticky;
	top: 0;
	z-index: 10;
	border-bottom: 1px solid var(--border-soft);
	background: rgba(10, 13, 19, 0.8);
	backdrop-filter: blur(10px);
}

.site-header .container {
	display: flex;
	align-items: baseline;
	flex-wrap: wrap;
	row-gap: 0.1rem;
	gap: 1rem;
	padding: 0.9rem 0;
}

.brand {
	font-size: 1.35rem;
	font-weight: 800;
	letter-spacing: -0.02em;
	text-decoration: none;
	color: var(--text);
}

.brand-accent {
	background: var(--grad);
	-webkit-background-clip: text;
	background-clip: text;
	color: transparent;
}

.brand-tag {
	color: var(--text);
	font-size: 0.95rem;
	font-weight: 600;
	letter-spacing: 0.03em;
	text-transform: uppercase;
}

.brand-tag .tag-accent {
	background: var(--grad);
	-webkit-background-clip: text;
	background-clip: text;
	color: transparent;
}

.site-footer {
	border-top: 1px solid var(--border-soft);
	padding: 1.5rem 0 2rem;
	color: var(--muted);
	font-size: 0.85rem;
}

.footer-fine { opacity: 0.75; margin-top: 0.25rem; }

/* ---------- hero ---------- */

.hero {
	padding: 4.5rem 0 2.5rem;
	text-align: center;
}

.hero h1 {
	margin: 0.75rem 0 0;
	font-size: clamp(2.1rem, 5.5vw, 3.4rem);
	line-height: 1.12;
	letter-spacing: -0.03em;
	font-weight: 800;
	max-width: 18ch;
	margin-inline: auto;
}

.grad {
	background: var(--grad);
	-webkit-background-clip: text;
	background-clip: text;
	color: transparent;
}

.hero h1 .grad {
	display: block;
	white-space: nowrap;
}

.eyebrow {
	color: var(--cyan);
	font-size: 0.8rem;
	font-weight: 600;
	letter-spacing: 0.14em;
	text-transform: uppercase;
	margin: 0;
}

.lede {
	color: var(--muted);
	font-size: 1.1rem;
	max-width: 46ch;
	margin: 1rem auto 0;
}

.badges {
	list-style: none;
	display: flex;
	flex-wrap: wrap;
	justify-content: center;
	gap: 0.5rem 1.25rem;
	padding: 0;
	margin: 1.75rem 0 0;
	color: var(--muted);
	font-size: 0.9rem;
}

/* ---------- feature highlights ---------- */

.features { margin: 0 auto 3rem; }

.features-heading { text-align: center; margin-bottom: 1.5rem; }
.features-heading h2 { margin: 0.4rem 0; font-size: clamp(1.5rem, 3vw, 2rem); letter-spacing: -0.03em; }
.features-heading > p:last-child { margin: 0; color: var(--muted); }

.feature-grid {
	display: grid;
	grid-template-columns: repeat(2, minmax(0, 1fr));
	gap: 1rem;
}

.feature-card {
	display: flex;
	flex-direction: column;
	align-items: flex-start;
	padding: 1.5rem;
	border: 1px solid rgba(76, 201, 240, 0.25);
	border-radius: var(--radius);
	background: linear-gradient(135deg, rgba(76, 201, 240, 0.08), var(--card-solid));
}

.feature-card:nth-child(even) {
	border-color: rgba(239, 74, 123, 0.25);
	background: linear-gradient(135deg, rgba(239, 74, 123, 0.08), var(--card-solid));
}

.feature-mark {
	display: grid;
	place-items: center;
	min-width: 3rem;
	height: 3rem;
	padding-inline: 0.5rem;
	border-radius: 10px;
	background: rgba(76, 201, 240, 0.12);
	color: var(--cyan);
	font-size: 1.15rem;
	font-weight: 800;
}

.feature-card:nth-child(even) .feature-mark { background: rgba(239, 74, 123, 0.12); color: var(--pink); }
.feature-card h3 { margin: 1rem 0 0.4rem; font-size: 1.2rem; }
.feature-card p { margin: 0 0 1.25rem; color: #b2bdce; }
.feature-detail { margin-top: auto; color: var(--cyan); font-size: 0.8rem; font-weight: 600; }
.feature-footnote { margin: 1rem 0 0; text-align: center; color: var(--muted); font-size: 0.85rem; }

/* ---------- difficulty picker ---------- */

fieldset.difficulty-picker {
	border: 0;
	padding: 0;
	margin: 0;
	gap: 0.6rem;
	display: grid;
	grid-template-columns: 1fr 1fr;
	align-content: start;
}

fieldset.difficulty-picker legend { grid-column: 1 / -1; }

fieldset.difficulty-picker legend {
	font-size: 0.8rem;
	font-weight: 600;
	letter-spacing: 0.04em;
	text-transform: uppercase;
	color: var(--muted);
	margin-bottom: 0.4rem;
	padding: 0;
}

.difficulty-option {
	display: grid;
	grid-template-columns: auto 1fr;
	grid-template-rows: auto auto;
	column-gap: 0.65rem;
	align-items: center;
	padding: 0.65rem 0.8rem;
	border: 1px solid var(--border);
	border-radius: 10px;
	background: var(--bg-soft);
	cursor: pointer;
	transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.difficulty-option:hover { border-color: #31405a; }

.difficulty-option input {
	grid-row: 1 / span 2;
	margin: 0;
	accent-color: var(--cyan);
	width: 1rem;
	height: 1rem;
}

.difficulty-option input:checked ~ .difficulty-name { color: var(--cyan); }

.difficulty-option:has(input:checked) {
	border-color: var(--ring);
	box-shadow: 0 0 0 1px var(--ring);
}

/* Disabled "coming soon" difficulties: visible, clearly not selectable,
   and — without a name attribute — never submitted with the form. */
.coming-soon-option {
	opacity: 0.55;
	cursor: not-allowed;
}

.coming-soon-option .soon-badge {
	grid-column: 2;
	justify-self: start;
	white-space: nowrap;
}

.difficulty-name { font-weight: 700; color: var(--text); }

.difficulty-desc {
	grid-column: 2;
	color: var(--muted);
	font-size: 0.8rem;
	line-height: 1.35;
}

/* ---------- coming-soon controls ---------- */

.coming-soon select {
	opacity: 0.55;
	cursor: not-allowed;
}

.soon-badge {
	display: inline-block;
	margin-left: 0.4rem;
	padding: 0.05rem 0.5rem;
	border-radius: 999px;
	border: 1px solid rgba(76, 201, 240, 0.4);
	color: var(--cyan);
	font-size: 0.65rem;
	font-weight: 700;
	letter-spacing: 0.06em;
	text-transform: uppercase;
	vertical-align: 1px;
}

/* ---------- cards & form ---------- */

.card {
	background: var(--card);
	border: 1px solid var(--border);
	border-radius: var(--radius);
	box-shadow: var(--shadow);
}

.upload-card {
	width: min(100%, 44rem);
	margin: 0 auto 3rem;
	padding: 2rem 2.25rem 2.25rem;
}

.upload-card h2, .steps h2, .previews h2 {
	margin: 0 0 1.25rem;
	font-size: 1.35rem;
	letter-spacing: -0.02em;
}

form {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 1.1rem 1.25rem;
}

.field { display: flex; flex-direction: column; }

.field-wide { grid-column: 1 / -1; }

.field label {
	font-size: 0.8rem;
	font-weight: 600;
	letter-spacing: 0.04em;
	text-transform: uppercase;
	color: var(--muted);
	margin-bottom: 0.4rem;
}

.optional { color: var(--muted); font-weight: 400; text-transform: none; letter-spacing: 0; }

.field input[type="file"],
.field input[type="text"],
.field select {
	width: 100%;
	padding: 0.7rem 0.85rem;
	border-radius: 10px;
	border: 1px solid var(--border);
	background: var(--bg-soft);
	color: var(--text);
	font: inherit;
	transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.field input:hover, .field select:hover { border-color: #31405a; }

.field input:focus-visible, .field select:focus-visible,
.btn-primary:focus-visible, .btn-ghost:focus-visible, a:focus-visible {
	outline: 2px solid var(--ring);
	outline-offset: 2px;
}

.field input[type="file"]::file-selector-button {
	margin-right: 0.75rem;
	padding: 0.35rem 0.8rem;
	border-radius: 8px;
	border: 1px solid var(--border);
	background: var(--card-solid);
	color: var(--text);
	font: inherit;
	font-size: 0.85rem;
	cursor: pointer;
}

.hint {
	margin: 0.4rem 0 0;
	color: var(--muted);
	font-size: 0.85rem;
}

.submit-row { align-items: start; }

/* ---------- buttons ---------- */

.btn-primary, .btn-ghost {
	display: inline-block;
	padding: 0.8rem 1.6rem;
	border: 0;
	border-radius: 10px;
	font: inherit;
	font-weight: 700;
	letter-spacing: 0.01em;
	text-decoration: none;
	cursor: pointer;
	transition: transform 0.12s ease, box-shadow 0.12s ease, filter 0.12s ease;
}

.btn-primary {
	color: #071018;
	background: var(--grad);
	box-shadow: 0 6px 24px rgba(76, 201, 240, 0.25);
}

.btn-primary:hover {
	transform: translateY(-1px);
	filter: brightness(1.06);
	box-shadow: 0 8px 30px rgba(239, 74, 123, 0.3);
}

.btn-primary:active { transform: translateY(0); }

.btn-ghost {
	color: var(--text);
	border: 1px solid var(--border);
	background: transparent;
}

.btn-ghost:hover { border-color: var(--cyan); color: var(--cyan); }

/* ---------- steps ---------- */

.steps { margin: 3.5rem 0; }

.steps ol {
	list-style: none;
	margin: 0;
	padding: 0;
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 1.25rem;
}

.steps li {
	display: flex;
	gap: 1rem;
	padding: 1.25rem 1.4rem;
	background: var(--card);
	border: 1px solid var(--border);
	border-radius: var(--radius);
}

.step-num {
	flex: none;
	width: 2.1rem;
	height: 2.1rem;
	display: grid;
	place-items: center;
	border-radius: 50%;
	border: 1px solid transparent;
	background:
		linear-gradient(var(--card-solid), var(--card-solid)) padding-box,
		var(--grad) border-box;
	font-weight: 800;
	color: var(--cyan);
}

.download-notice {
	margin: 1.25rem 0 0;
	padding: 0.9rem 1rem;
	border-left: 3px solid var(--pink);
	border-radius: 0 8px 8px 0;
	background: rgba(239, 74, 123, 0.08);
	font-size: 0.9rem;
}

.download-notice strong { display: block; margin-bottom: 0.3rem; }

/* ---------- status page ---------- */

.status-card {
	width: min(100%, 52rem);
	margin: 3rem auto 0;
	padding: 2rem 2.25rem 2.25rem;
}

.status-card h1 { margin: 0; font-size: 1.8rem; letter-spacing: -0.02em; }

.status-message { color: var(--muted); margin: 0.5rem 0 0; }

.cta-row { margin: 1.75rem 0 0; }

.single-action { display: block; margin-top: 1.25rem; }
.chart-list { padding-left: 1.25rem; }
.chart-list li { margin-bottom: 0.5rem; }

/* ---------- admin panel ---------- */

.admin-card {
	width: min(100%, 60rem);
	margin: 3rem auto 0;
	padding: 2rem 2.25rem 2.25rem;
}

.admin-card h1 { margin: 0 0 0.75rem; font-size: 1.6rem; }

.admin-error {
	padding: 0.7rem 1rem;
	border-left: 3px solid var(--pink);
	background: rgba(239, 74, 123, 0.08);
	border-radius: 0 8px 8px 0;
}

.admin-card form { max-width: 26rem; }

.admin-stats { margin-bottom: 2rem; }
.admin-stats dd { color: var(--muted); }

.admin-table {
	width: 100%;
	border-collapse: collapse;
	font-size: 0.85rem;
}

.admin-table th {
	text-align: left;
	color: var(--muted);
	font-weight: 600;
	padding: 0.4rem 0.6rem;
	border-bottom: 1px solid var(--border);
}

.admin-table td { padding: 0.45rem 0.6rem; border-bottom: 1px solid var(--border-soft); }

.admin-running td { color: var(--cyan); }

.admin-error-text { color: var(--pink); font-size: 0.75rem; }

.details {
	display: grid;
	grid-template-columns: auto 1fr;
	gap: 0.35rem 1.25rem;
	margin: 1.5rem 0 0;
	padding: 1.1rem 1.25rem;
	background: var(--bg-soft);
	border: 1px solid var(--border-soft);
	border-radius: 10px;
	font-size: 0.95rem;
}

.details dt {
	color: var(--muted);
	font-size: 0.78rem;
	font-weight: 600;
	text-transform: uppercase;
	letter-spacing: 0.05em;
	align-self: center;
}

.details dd { margin: 0; }

/* processing shimmer */

.progress {
	margin-top: 1.5rem;
	height: 6px;
	border-radius: 999px;
	background: var(--bg-soft);
	border: 1px solid var(--border-soft);
	overflow: hidden;
}

.progress-fill {
	height: 100%;
	width: 40%;
	border-radius: inherit;
	background: var(--grad);
	animation: sweep 1.6s ease-in-out infinite;
}

@keyframes sweep {
	from { transform: translateX(-100%); }
	to   { transform: translateX(280%); }
}

/* previews */

.previews { margin-top: 2rem; }

.preview-grid {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 1.25rem;
	margin-top: 1rem;
}

.preview {
	background: var(--bg-soft);
	border: 1px solid var(--border);
	border-radius: var(--radius);
	overflow: hidden;
	align-self: start;
}

.preview summary {
	cursor: pointer;
	padding: 1rem 1.25rem;
	font-weight: 700;
	list-style: none;
	display: flex;
	align-items: center;
	gap: 0.6rem;
}

.preview summary::-webkit-details-marker { display: none; }

.play-mark {
	width: 2rem;
	height: 2rem;
	display: grid;
	place-items: center;
	border-radius: 50%;
	background: var(--grad);
	color: #071018;
	font-size: 0.7rem;
	padding-left: 0.1rem;
}

.preview[open] summary {
	border-bottom: 1px solid var(--border);
}

.preview iframe {
	display: block;
	width: 100%;
	aspect-ratio: 16 / 9;
	border: 0;
	background: #000;
}

.preview .hint { padding: 0.6rem 1.25rem 0.9rem; }

/* ---------- responsive & motion ---------- */

@media (max-width: 48rem) {
	.feature-grid { grid-template-columns: 1fr; }
	fieldset.difficulty-picker { grid-template-columns: 1fr; }
	form, .steps ol, .preview-grid { grid-template-columns: 1fr; }
	.hero { padding-top: 3rem; }
	.brand-tag { display: none; }
	.upload-card, .status-card { padding: 1.5rem 1.25rem; }
}

@media (prefers-reduced-motion: reduce) {
	* { animation: none !important; transition: none !important; }
}