/* 369 Tesla ExamOS — base + components */
@import url('https://fonts.googleapis.com/css2?family=Manrope:wght@500;600;700&family=Sora:wght@600;700&family=Noto+Sans+Tamil:wght@500;600;700&display=swap');

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: var(--font-ui);
    font-size: 15px;
    line-height: 1.55;
    font-weight: 500;
    color: var(--text-primary);
    background: var(--surface-soft);
    -webkit-font-smoothing: antialiased;
}
body[lang="ta"] { font-family: var(--font-tamil); }
img { max-width: 100%; display: block; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4,
.brand-title,
.page-title,
.auth-title,
.stat .num,
.metric .n {
    font-family: var(--font-heading);
    color: var(--text-primary);
    line-height: 1.25;
    margin: 0 0 .5em;
    font-weight: 700;
    letter-spacing: -0.025em;
}
button, input, select, textarea { font-family: var(--font-ui); }
.exam-timer { font-variant-numeric: tabular-nums; font-weight: 700; }
p { margin: 0 0 1rem; }
:focus-visible { outline: 3px solid rgba(24,71,184,.35); outline-offset: 2px; border-radius: 6px; }

.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 20px; }

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex; align-items: center; gap: .5rem;
    font: inherit; font-weight: 600; cursor: pointer;
    padding: .7rem 1.35rem; border-radius: var(--radius-pill);
    border: 1px solid transparent; transition: transform .12s ease, box-shadow .15s ease, background .15s ease;
    text-decoration: none; white-space: nowrap;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-primary { background: var(--primary); color: #fff; box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: var(--primary-dark); color: #fff; }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: #e86800; color: #fff; }
.btn-ghost { background: transparent; color: var(--primary); border-color: var(--border-strong); }
.btn-ghost:hover { background: var(--primary-soft); }
.btn-light { background: #fff; color: var(--primary); box-shadow: var(--shadow-sm); }
.btn-block { width: 100%; justify-content: center; }
.btn-sm { padding: .45rem .9rem; font-size: .9rem; }
.btn-lg { padding: .9rem 1.8rem; font-size: 1.05rem; }

/* ---------- Cards ---------- */
.card {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--radius-md); box-shadow: var(--shadow-sm);
    padding: 1.5rem;
}
.card-hover { transition: transform .16s ease, box-shadow .16s ease; }
.card-hover:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }

/* ---------- Badges & chips ---------- */
.badge {
    display: inline-flex; align-items: center; gap: .35rem;
    font-size: .78rem; font-weight: 600; padding: .28rem .7rem;
    border-radius: var(--radius-pill); background: var(--surface-alt); color: var(--text-secondary);
}
.badge-primary { background: var(--primary-soft); color: var(--primary); }
.badge-accent { background: var(--accent-soft); color: #c85f00; }
.badge-teal { background: var(--teal-soft); color: var(--teal); }
.badge-success { background: #E3F6EC; color: var(--success); }
.badge-warning { background: var(--warning-soft); color: #b57d10; }

/* ---------- Forms ---------- */
.field { margin-bottom: 1.1rem; }
.field label { display: block; font-weight: 600; font-size: .92rem; margin-bottom: .4rem; color: var(--text-primary); }
.input, .select, .textarea {
    width: 100%; font: inherit; color: var(--text-primary);
    padding: .75rem .9rem; border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm); background: #fff; transition: border .15s, box-shadow .15s;
}
.input:focus, .select:focus, .textarea:focus {
    outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(24,71,184,.15);
}
.field-error .input, .field-error .select { border-color: var(--danger); }
.error-text { color: var(--danger); font-size: .82rem; margin-top: .35rem; }
.form-hint { color: var(--text-muted); font-size: .82rem; margin-top: .35rem; }
.checkbox-row { display: flex; align-items: flex-start; gap: .6rem; font-size: .9rem; color: var(--text-secondary); }
.checkbox-row input { margin-top: .2rem; }

/* ---------- Alerts ---------- */
.alert { padding: .85rem 1.1rem; border-radius: var(--radius-sm); margin-bottom: 1rem; font-size: .92rem; border: 1px solid transparent; display: flex; gap: .6rem; align-items: flex-start; }
.alert-success { background: #E3F6EC; color: #0f6b45; border-color: #bfe8d3; }
.alert-error { background: var(--danger-soft); color: #a52626; border-color: #f2c9c9; }
.alert-warning { background: var(--warning-soft); color: #8a5e08; border-color: #f5e0b3; }
.alert-info { background: var(--primary-soft); color: var(--primary-dark); border-color: #cdddf7; }

/* ---------- Grid helpers ---------- */
.grid { display: grid; gap: 1.25rem; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.stack { display: flex; flex-direction: column; gap: 1rem; }
.row { display: flex; gap: 1rem; align-items: center; }
.between { justify-content: space-between; }
.wrap { flex-wrap: wrap; }
.muted { color: var(--text-secondary); }
.small { font-size: .85rem; }
.text-center { text-align: center; }
.mt-0 { margin-top: 0; } .mb-0 { margin-bottom: 0; }
.section { padding: 4rem 0; }
.section-tight { padding: 2.5rem 0; }
.eyebrow { text-transform: uppercase; letter-spacing: .12em; font-size: .78rem; font-weight: 700; color: var(--primary); }

/* ---------- Progress ---------- */
.progress { height: 8px; background: var(--surface-alt); border-radius: var(--radius-pill); overflow: hidden; }
.progress > span { display: block; height: 100%; background: linear-gradient(90deg, var(--primary), var(--secondary)); border-radius: inherit; }

/* icon helpers */
.icon-badge { display: inline-flex; align-items: center; justify-content: center; width: 44px; height: 44px; border-radius: 12px; background: var(--primary-soft); color: var(--primary); flex: none; }
.icon-badge.accent { background: var(--accent-soft); color: #c85f00; }
.icon-badge.teal { background: var(--teal-soft); color: var(--teal); }
.icon-badge.violet { background: var(--secondary-soft); color: var(--secondary); }

@media (max-width: 991px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .section { padding: 2.5rem 0; }
}