:root {
    color-scheme: light;
    font-family: "Inter", "Segoe UI", sans-serif;
    color: #172033;
    background:
        radial-gradient(circle at top left, rgba(15, 118, 110, 0.12), transparent 30%),
        linear-gradient(180deg, #f8fafc 0%, #e2e8f0 100%);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
}

a {
    color: inherit;
    text-decoration: none;
}

.app-shell,
.login-shell {
    min-height: 100vh;
    padding: 2rem;
}

.dashboard-shell,
.login-card {
    max-width: 1200px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.88);
    border: 1px solid rgba(148, 163, 184, 0.28);
    border-radius: 24px;
    box-shadow: 0 24px 60px -28px rgba(15, 23, 42, 0.45);
    backdrop-filter: blur(12px);
}

.dashboard-shell {
    padding: 2rem;
}

.login-shell {
    display: grid;
    place-items: center;
}

.login-card {
    width: min(100%, 460px);
    padding: 2rem;
}

.dashboard-header,
.toolbar-row,
.student-form,
.header-tools,
.card-head {
    display: flex;
    gap: 1rem;
}

.dashboard-header,
.toolbar-row,
.card-head {
    align-items: end;
    justify-content: space-between;
}

.dashboard-header {
    padding-bottom: 1.5rem;
    border-bottom: 1px solid #dbe4ee;
}

.header-tools,
.student-form {
    align-items: center;
    flex-wrap: wrap;
}

.toolbar-row {
    margin: 1.5rem 0;
    flex-wrap: wrap;
}

.card {
    margin-top: 1.5rem;
    padding: 1.25rem;
    border: 1px solid #dbe4ee;
    border-radius: 20px;
    background: #fff;
}

.card h2,
.dashboard-header h1,
.login-card h1,
.modal-card h3 {
    margin: 0;
}

.eyebrow {
    margin: 0 0 0.5rem;
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: #0f766e;
}

.muted {
    margin: 0.35rem 0 0;
    color: #5b697d;
}

.field-group {
    display: grid;
    gap: 0.4rem;
}

.field-grow {
    flex: 1 1 280px;
}

.input,
.search-input {
    width: 100%;
    min-height: 44px;
    padding: 0.7rem 0.9rem;
    border: 1px solid #c7d3e0;
    border-radius: 12px;
    background: #fff;
    font: inherit;
}

.search-form {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.search-input {
    min-width: 240px;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 0.7rem 1rem;
    border-radius: 12px;
    border: 1px solid transparent;
    font: inherit;
    font-weight: 600;
    cursor: pointer;
}

.button[disabled] {
    cursor: not-allowed;
    opacity: 0.55;
}

.button-dark {
    background: #172033;
    color: #fff;
}

.button-light {
    background: #eff5fb;
    color: #172033;
    border-color: #c7d3e0;
}

.button-block {
    width: 100%;
}

.notice {
    margin: 1rem 0;
    padding: 0.9rem 1rem;
    border-radius: 14px;
    background: #ecfeff;
    color: #155e75;
    border: 1px solid #a5f3fc;
}

.notice-error {
    background: #fff1f2;
    border-color: #fecdd3;
    color: #9f1239;
}

.table-wrap {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th,
td {
    padding: 0.9rem 0.75rem;
    text-align: left;
    border-bottom: 1px solid #e2e8f0;
}

th {
    color: #475569;
    font-size: 0.9rem;
}

.empty-state {
    color: #64748b;
    text-align: center;
}

.modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.45);
    display: grid;
    place-items: center;
    padding: 1rem;
}

.modal-card {
    width: min(100%, 460px);
    padding: 1.5rem;
    border-radius: 20px;
    background: #fff;
    box-shadow: 0 24px 60px -28px rgba(15, 23, 42, 0.45);
}

.login-form {
    display: grid;
    gap: 1rem;
    margin-top: 1.5rem;
}

.scanner-panel {
    width: 100%;
    margin-top: 1rem;
    padding: 1rem;
    border: 1px dashed #94a3b8;
    border-radius: 16px;
    background: #f8fafc;
}

.scanner-video {
    width: min(100%, 360px);
    border-radius: 12px;
    background: #0f172a;
    aspect-ratio: 4 / 3;
    object-fit: cover;
}

.scanner-toolbar {
    display: flex;
    gap: 1rem;
    justify-content: space-between;
    align-items: center;
    margin-top: 0.75rem;
    flex-wrap: wrap;
}

.scanner-status {
    margin: 0;
    color: #475569;
}

@media (max-width: 900px) {
    .app-shell,
    .login-shell {
        padding: 1rem;
    }

    .dashboard-shell,
    .login-card {
        border-radius: 18px;
    }

    .dashboard-shell {
        padding: 1.25rem;
    }

    .dashboard-header,
    .toolbar-row,
    .card-head,
    .search-form,
    .student-form,
    .header-tools {
        flex-direction: column;
        align-items: stretch;
    }

    .search-input {
        min-width: 0;
    }
}