:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --primary-soft: #eef2ff;
    --accent: #0ea5e9;
    --bg-body: radial-gradient(circle at top left, #f8fbff 0%, #f2f5ff 45%, #eef2ff 100%);
    --bg-card: rgba(255, 255, 255, 0.9);
    --text-main: #0b1220;
    --text-muted: #64748b;
    --border: rgba(148, 163, 184, 0.28);
    --radius: 14px;
    --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg-body);
    color: var(--text-main);
    line-height: 1.5;
    padding-bottom: env(safe-area-inset-bottom);
}

header {
    background: rgba(255, 255, 255, 0.85);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 1rem;
    position: sticky;
    top: 0;
    z-index: 50;
}

header h1 { margin: 0 0 0.5rem 0; font-size: 1.25rem; }

.schedule-nav { display: flex; gap: 0.5rem; overflow-x: auto; padding-bottom: 5px; }

.schedule-nav a {
    text-decoration: none;
    color: var(--text-muted);
    padding: 0.5rem 1rem;
    border-radius: 999px;
    font-size: 0.875rem;
    font-weight: 600;
    background: transparent;
    border: 1px solid transparent;
    white-space: nowrap;
}

.schedule-nav a.active {
    background: var(--primary-soft);
    color: var(--primary);
    border-color: #c7d2fe;
}

main,
.page-content {
    max-width: 960px;
    margin: 0 auto;
    padding: 1.5rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

section { display: flex; flex-direction: column; gap: 1rem; }
h2 { font-size: 1.4rem; margin: 0; color: var(--text-main); letter-spacing: -0.02em; }
h3 { letter-spacing: -0.01em; }

.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.15rem;
    box-shadow: var(--shadow);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
}

.unread-card { border-left: 4px solid var(--primary); }

.button,
button,
input[type="submit"] {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    gap: 0.35rem;
    padding: 0.62rem 1rem;
    border-radius: 10px;
    font-weight: 650;
    font-size: 0.9rem;
    border: 1px solid var(--border);
    background: #fff;
    color: var(--text-main);
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s ease;
}

.button:hover,
button:hover,
input[type="submit"]:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 20px rgba(79, 70, 229, 0.15);
}

button[type="submit"],
.button:not(.button-outline):not(.button-danger):not([disabled]) {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    border: none;
}

button[type="submit"]:hover,
.button:not(.button-outline):not(.button-danger):not([disabled]):hover {
    background: linear-gradient(135deg, var(--primary-hover), #0284c7);
}

.button-outline {
    background: rgba(255, 255, 255, 0.75);
    border-color: #cbd5e1;
    color: #334155;
}

.button-danger {
    background: #fee2e2;
    color: #b91c1c;
    border-color: #fecaca;
}

.button[disabled],
button[disabled] {
    opacity: 0.75;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

input, select, textarea {
    width: 100%;
    padding: 0.7rem;
    border: 1px solid #dbe5f2;
    border-radius: 10px;
    font-size: 0.95rem;
    background: #fff;
    margin-bottom: 0.5rem;
}

input:focus,
select:focus,
textarea:focus {
    outline: 2px solid #c7d2fe;
    border-color: #818cf8;
}

label {
    display: block;
    font-size: 0.83rem;
    font-weight: 700;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.week-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.8rem;
    background: rgba(255, 255, 255, 0.9);
    padding: 0.75rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    margin-bottom: 0.6rem;
}

.empty-state {
    text-align: center;
    color: var(--text-muted);
    padding: 2rem;
    border: 1px dashed #cbd5e1;
    border-radius: var(--radius);
    background: rgba(255, 255, 255, 0.72);
}

.badge,
.badge-chip {
    background: #e0e7ff;
    color: #3730a3;
    padding: 2px 8px;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 700;
}

.badge-chip { margin-left: 5px; }

details summary { cursor: pointer; font-weight: 600; color: #334155; }

.bottom-nav {
    background: rgba(255, 255, 255, 0.92) !important;
    border-top: 1px solid var(--border) !important;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

@media (max-width: 700px) {
    main,
    .page-content {
        padding: 1rem 0.85rem;
    }

    .week-controls {
        flex-wrap: wrap;
        justify-content: center;
    }
}