/* ===================================================================
   SD ACADEMY — ADMIN DESIGN SYSTEM
   Palette: Ink Navy (structure) + Marigold (action) + Exam-Red (the
   red margin line / teacher's red pen — used for destructive states
   and as a quiet structural signature throughout the panel).
   =================================================================== */

:root {
    --navy: #1B2A4A;
    --navy-light: #28406b;
    --navy-soft: #eef1f7;
    --marigold: #E8A33D;
    --marigold-dark: #c4831f;
    --crimson: #B83227;
    --crimson-soft: #fbeae8;
    --green: #1F7A4D;
    --green-soft: #e9f6ef;
    --paper: #F4F6FA;
    --white: #ffffff;
    --border: #E2E6ED;
    --text: #1F2937;
    --text-muted: #6B7280;
    --radius: 10px;
    --shadow: 0 1px 2px rgba(27, 42, 74, 0.06), 0 4px 14px rgba(27, 42, 74, 0.05);
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--paper);
    color: var(--text);
    font-size: 14.5px;
    line-height: 1.5;
}

h1, h2, h3, h4 {
    font-family: 'Poppins', 'Inter', sans-serif;
    color: var(--navy);
    margin: 0 0 .4em;
}

a { color: var(--navy); text-decoration: none; }
a:hover { color: var(--marigold-dark); }

/* ---------- LAYOUT ---------- */
.app-shell { display: flex; min-height: 100vh; }

.sidebar {
    width: 248px;
    flex-shrink: 0;
    background: var(--navy);
    color: #cfd7e8;
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 0;
    height: 100vh;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 20px 18px;
    border-bottom: 1px solid rgba(255,255,255,.08);
}

.sidebar-brand img { height: 32px; width: 32px; object-fit: contain; border-radius: 6px; background: #fff; }
.sidebar-brand .name { font-family: 'Poppins', sans-serif; font-weight: 600; color: #fff; font-size: 15px; line-height: 1.2; }
.sidebar-brand .tag { font-size: 11px; color: #93a3c4; }

.sidebar-nav { padding: 14px 10px; flex: 1; overflow-y: auto; }
.sidebar-section-label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: .06em;
    color: #7384a8;
    padding: 14px 12px 6px;
}

.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 12px;
    border-radius: 8px;
    color: #cfd7e8;
    font-size: 13.5px;
    font-weight: 500;
    margin-bottom: 2px;
    border-left: 3px solid transparent;
}

.sidebar-nav a:hover { background: rgba(255,255,255,.06); color: #fff; }

.sidebar-nav a.active {
    background: rgba(232,163,61,.12);
    color: #fff;
    border-left: 3px solid var(--crimson);
}

.sidebar-nav .icon { width: 18px; text-align: center; opacity: .9; }

.sidebar-foot { padding: 14px 18px; border-top: 1px solid rgba(255,255,255,.08); font-size: 12px; color: #7384a8; }

.main { flex: 1; min-width: 0; }

.topbar {
    background: var(--white);
    border-bottom: 1px solid var(--border);
    padding: 14px 26px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 5;
}

.topbar h1 { font-size: 19px; margin: 0; }
.topbar .who { display: flex; align-items: center; gap: 12px; font-size: 13px; color: var(--text-muted); }
.topbar .who .avatar {
    width: 32px; height: 32px; border-radius: 50%;
    background: var(--marigold); color: #fff; display: flex; align-items: center; justify-content: center;
    font-weight: 600; font-family: 'Poppins', sans-serif; font-size: 13px;
}

.content { padding: 26px; max-width: 1180px; }

/* ---------- CARDS ---------- */
.card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 22px;
    margin-bottom: 22px;
}

.card-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--border);
}

.card-head h2 { font-size: 16px; margin: 0; }
.card-head p { margin: 2px 0 0; font-size: 12.5px; color: var(--text-muted); }

/* Stat cards carry the "exam stamp" signature: a left red margin rule,
   like the correction line on a Pakistani answer sheet. */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; margin-bottom: 22px; }
.stat-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-left: 4px solid var(--crimson);
    border-radius: var(--radius);
    padding: 16px 18px;
    box-shadow: var(--shadow);
}
.stat-card .label { font-size: 12px; color: var(--text-muted); text-transform: uppercase; letter-spacing: .05em; }
.stat-card .value { font-family: 'Poppins', sans-serif; font-size: 28px; font-weight: 600; color: var(--navy); margin-top: 4px; }
.stat-card .sub { font-size: 12px; color: var(--text-muted); margin-top: 2px; }

/* ---------- BUTTONS ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    border: 1px solid transparent;
    padding: 9px 16px;
    border-radius: 8px;
    font-size: 13.5px;
    font-weight: 600;
    cursor: pointer;
    font-family: inherit;
    transition: filter .15s ease, transform .05s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--navy); color: #fff; }
.btn-primary:hover { filter: brightness(1.15); color: #fff; }
.btn-accent { background: var(--marigold); color: #1c1303; }
.btn-accent:hover { background: var(--marigold-dark); color: #1c1303; }
.btn-outline { background: #fff; color: var(--navy); border-color: var(--border); }
.btn-outline:hover { border-color: var(--navy); }
.btn-danger { background: var(--crimson-soft); color: var(--crimson); }
.btn-danger:hover { background: var(--crimson); color: #fff; }
.btn-sm { padding: 6px 11px; font-size: 12.5px; border-radius: 6px; }
.btn-block { width: 100%; justify-content: center; }

/* ---------- FORMS ---------- */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 13px; font-weight: 600; color: var(--text); margin-bottom: 6px; }
.form-group .hint { font-size: 12px; color: var(--text-muted); margin-top: 4px; }

input[type=text], input[type=email], input[type=password], input[type=number],
input[type=file], input[type=search], input[type=color], input[type=tel],
select, textarea {
    width: 100%;
    padding: 9px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 13.5px;
    font-family: inherit;
    background: #fff;
    color: var(--text);
}
input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--marigold);
    box-shadow: 0 0 0 3px rgba(232,163,61,.18);
}
textarea { resize: vertical; min-height: 90px; }

.form-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }

/* ---------- TABLE ---------- */
.table-wrap { overflow-x: auto; }
table.data { width: 100%; border-collapse: collapse; font-size: 13.5px; }
table.data th {
    text-align: left;
    font-size: 11.5px;
    text-transform: uppercase;
    letter-spacing: .04em;
    color: var(--text-muted);
    border-bottom: 2px solid var(--border);
    padding: 10px 12px;
    white-space: nowrap;
}
table.data td { padding: 11px 12px; border-bottom: 1px solid var(--border); vertical-align: middle; }
table.data tr:hover td { background: var(--navy-soft); }
table.data .actions { display: flex; gap: 6px; white-space: nowrap; }

/* ---------- BADGES (the "exam stamp" pill) ---------- */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 3px 10px;
    border-radius: 999px;
    font-size: 11.5px;
    font-weight: 600;
    border: 1px dashed currentColor;
}
.badge-green { background: var(--green-soft); color: var(--green); }
.badge-crimson { background: var(--crimson-soft); color: var(--crimson); }
.badge-navy { background: var(--navy-soft); color: var(--navy); }
.badge-gray { background: #f1f2f4; color: var(--text-muted); border-style: solid; }

/* ---------- ALERTS / FLASH ---------- */
.alert { padding: 12px 16px; border-radius: 8px; font-size: 13.5px; margin-bottom: 16px; border-left: 4px solid; }
.alert-success { background: var(--green-soft); color: var(--green); border-color: var(--green); }
.alert-error { background: var(--crimson-soft); color: var(--crimson); border-color: var(--crimson); }
.alert-info { background: var(--navy-soft); color: var(--navy); border-color: var(--navy); }

/* ---------- EMPTY STATE ---------- */
.empty-state { text-align: center; padding: 50px 20px; color: var(--text-muted); }
.empty-state .icon { font-size: 34px; margin-bottom: 10px; }

/* ---------- LOGIN PAGE ---------- */
.login-screen {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--navy);
    background-image: radial-gradient(circle at 20% 20%, #28406b 0%, var(--navy) 60%);
    padding: 20px;
}
.login-card {
    background: #fff;
    width: 100%;
    max-width: 380px;
    border-radius: 14px;
    padding: 34px 30px;
    box-shadow: 0 20px 50px rgba(0,0,0,.35);
    border-top: 4px solid var(--crimson);
}
.login-card .brand { text-align: center; margin-bottom: 22px; }
.login-card .brand img { height: 46px; margin-bottom: 8px; }
.login-card .brand .name { font-family: 'Poppins', sans-serif; font-weight: 700; font-size: 19px; color: var(--navy); }
.login-card .brand .tag { font-size: 12px; color: var(--text-muted); }

/* ---------- MISC ---------- */
.text-muted { color: var(--text-muted); }
.mt-0 { margin-top: 0; }
.flex { display: flex; align-items: center; }
.gap-8 { gap: 8px; }
.justify-between { justify-content: space-between; }

@media (max-width: 880px) {
    .sidebar { position: fixed; left: -260px; z-index: 50; transition: left .2s ease; box-shadow: 4px 0 20px rgba(0,0,0,.2); }
    .sidebar.open { left: 0; }
    .content { padding: 16px; }
}