/* Minimal soft theme for index.php
   - Soft color palette
   - Elegant sans-serif stack
   - Simple responsive navigation and layout
*/
:root {
    --bg: #f7fafc;
    /* off-white */
    --surface: #ffffff;
    --muted: #6b7280;
    --primary: #64748b;
    /* soft slate */
    --accent: #60a5fa;
    /* soft blue */
    --success: #10b981;
    --radius: 10px;
}

html,
body {
    height: 100%;
}

body {
    margin: 0;
    font-family: Inter, system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg);
    color: #0f172a;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    line-height: 1.4;
}

.container {
    max-width: 1100px;
    margin: 20px auto;
    padding: 0 16px;
}

/* header */
header {
    display: flex;
    align-items: center;
    gap: 10px;
    justify-content: space-between;
    padding: 8px 8px;
    background: transparent;
}

header .brand {
    display: flex;
    align-items: center;
    gap: 12px
}

header h1 {
    font-size: 18px;
    margin: 0;
    color: #07102a;
    letter-spacing: 0.2px
}

header .subtitle {
    font-size: 12px;
    color: var(--muted)
}

/* nav */
.main-nav {
    display: flex;
    gap: 8px;
    align-items: center
}

.main-nav a {
    display: inline-block;
    padding: 8px 12px;
    border-radius: 999px;
    text-decoration: none;
    color: var(--primary);
    background: transparent;
    border: 1px solid transparent;
    transition: all .18s ease
}

.main-nav a.nav-btn:hover {
    background: rgba(96, 165, 250, 0.08);
    border-color: rgba(96, 165, 250, 0.12)
}

.nav-toggle {
    display: none;
    background: transparent;
    border: 1px solid transparent;
    padding: 8px;
    border-radius: 8px;
    font-size: 18px
}

/* layout */
.layout {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 8px;
    margin-top: 8px
}

.content h2 {
    margin-top: 0
}

.jenjang-row {
    margin-bottom: 14px
}

.kelas-list {
    --gap: 12px;
    --cols: 6;
    display: grid;
    gap: var(--gap);
    align-items: start;
    grid-auto-flow: column;
    grid-auto-columns: minmax(80px, calc((100% - ((var(--cols) - 1) * var(--gap))) / var(--cols)));
    overflow-x: auto;
}

@media (max-width: 520px) {
    .kelas-list {
        display: grid;
        grid-auto-flow: column;
        grid-auto-columns: 120px;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
}

.kelas-card {
    background: var(--surface);
    padding: 12px;
    border-radius: var(--radius);
    box-shadow: 0 6px 18px rgba(15, 23, 42, 0.04);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    min-width: 120px;
    width: 100%;
}

.kelas-card canvas {
    width: 80%;
    max-width: 56px;
    min-width: 28px;
    aspect-ratio: 1 / 1;
    height: auto;
    display: block;
    margin: 0 auto 8px auto;
}

.kelas-card .chart-kelas {
    max-width: 56px;
}

.kelas-info {
    font-size: 14px;
    color: var(--muted)
}

.kelas-count {
    color: var(--muted);
    font-size: 13px;
    margin-top: 4px;
}

.kelas-percent {
    color: var(--muted);
    font-size: 12px;
    margin-top: 4px;
    font-style: italic;
}

.form-panel {
    background: var(--surface);
    padding: 12px;
    border-radius: var(--radius);
    box-shadow: 0 6px 18px rgba(15, 23, 42, 0.04)
}

.form-panel label {
    display: block;
    font-size: 13px;
    color: var(--muted);
    margin-top: 8px
}

input[type=text],
input[type=password],
input[type=date],
select,
textarea {
    width: 100%;
    padding: 10px;
    border-radius: 8px;
    border: 1px solid #e6edf3;
    background: #fff
}

button.btn {
    background: transparent;
    border: 1px solid #d1d5db;
    padding: 8px 12px;
    border-radius: 8px;
    color: #111;
    font-weight: 600;
    cursor: pointer
}

button.btn.primary {
    background: var(--accent);
    color: #fff;
    border-color: transparent
}

button.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 14px rgba(2, 6, 23, 0.06)
}

/* modal - reuse existing markup, add subtle backdrop */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    align-items: center;
    justify-content: center;
    background: rgba(2, 6, 23, 0.35);
    padding: 18px
}

.modal .modal-content {
    background: var(--surface);
    border-radius: 10px;
    padding: 14px;
    max-width: 720px;
    width: 100%;
    box-shadow: 0 10px 30px rgba(2, 6, 23, 0.08)
}

.close-modal {
    background: transparent;
    border: 0;
    font-size: 20px;
    position: absolute;
    right: 12px;
    top: 8px
}

/* responsive */
@media (max-width:900px) {
    .layout {
        grid-template-columns: 1fr;
    }

    .main-nav {
        position: absolute;
        top: 64px;
        right: 12px;
        flex-direction: column;
        padding: 10px;
        background: var(--surface);
        border-radius: 10px;
        box-shadow: 0 8px 30px rgba(2, 6, 23, 0.06);
        display: none
    }

    .main-nav.open {
        display: flex
    }

    .nav-toggle {
        display: inline-block
    }

    header {
        position: relative
    }

    .kelas-card {
        min-width: 160px
    }
}

/* accessibility focus states */
.main-nav a:focus,
.nav-toggle:focus,
button.btn:focus {
    outline: 2px solid rgba(96, 165, 250, 0.28);
    outline-offset: 2px
}

/* small utilities */
.muted {
    color: var(--muted)
}