:root {
    --ozs-ink: #1d2a38;
    --ozs-soft: #5c6b77;
    --ozs-line: rgba(29, 42, 56, 0.1);
    --ozs-surface: rgba(255, 255, 255, 0.92);
    --ozs-bg-top: #e8f4f8;
    --ozs-bg-bottom: #f0f4e8;
    --ozs-primary: #0d6efd;
    --ozs-primary-dark: #0a58ca;
    --ozs-accent: #198754;
}

body {
    margin: 0;
    font-family: "Public Sans", sans-serif;
    color: var(--ozs-ink);
    background: linear-gradient(180deg, var(--ozs-bg-top) 0%, var(--ozs-bg-bottom) 100%);
    min-height: 100vh;
}

a {
    color: var(--ozs-primary-dark);
    text-decoration: none;
}

a:hover {
    color: var(--ozs-primary);
}

/* ===== Navbar (patient) ===== */
.ozs-nav {
    background: rgba(255, 255, 255, 0.88);
    border-bottom: 1px solid var(--ozs-line);
    backdrop-filter: blur(12px);
}

.ozs-nav .navbar-brand {
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--ozs-ink);
    font-size: 1.3rem;
}

.ozs-nav .nav-link {
    color: var(--ozs-soft);
    font-weight: 600;
}

.ozs-nav .nav-link.active,
.ozs-nav .nav-link:hover {
    color: var(--ozs-ink);
}

/* ===== Navbar (admin) ===== */
.ozs-nav-admin {
    background: #212529;
    border-bottom: 2px solid var(--ozs-primary);
}

.ozs-nav-admin .navbar-brand {
    font-weight: 800;
    color: #fff;
    font-size: 1.2rem;
}

.ozs-nav-admin .nav-link {
    color: rgba(255, 255, 255, 0.75);
    font-weight: 500;
    font-size: 0.9rem;
}

.ozs-nav-admin .nav-link:hover,
.ozs-nav-admin .nav-link.active {
    color: #fff;
}

/* ===== Surface cards ===== */
.surface-card {
    border-radius: 20px;
    border: 1px solid var(--ozs-line);
    background: var(--ozs-surface);
    box-shadow: 0 16px 48px rgba(29, 42, 56, 0.06);
}

.hero-panel {
    border-radius: 24px;
    border: 1px solid var(--ozs-line);
    background: var(--ozs-surface);
    box-shadow: 0 24px 60px rgba(29, 42, 56, 0.08);
    padding: 2rem;
}

/* ===== Category cards ===== */
.ozs-category-card {
    border-radius: 16px;
    border: 1px solid var(--ozs-line);
    background: var(--ozs-surface);
    transition: all 0.2s ease;
    cursor: pointer;
}

.ozs-category-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(13, 110, 253, 0.15);
    border-color: var(--ozs-primary);
}

.ozs-category-card .card-title {
    color: var(--ozs-ink);
}

.ozs-category-card:hover .card-title {
    color: var(--ozs-primary);
}

/* ===== Problem cards ===== */
.ozs-problem-card {
    border-radius: 16px;
    border: 1px solid var(--ozs-line);
    background: var(--ozs-surface);
    transition: all 0.2s ease;
}

.ozs-problem-card:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

/* ===== Buttons ===== */
.btn-primary {
    background: var(--ozs-primary);
    border-color: var(--ozs-primary);
}

.btn-primary:hover,
.btn-primary:focus {
    background: var(--ozs-primary-dark);
    border-color: var(--ozs-primary-dark);
}

/* ===== Badges ===== */
.eyebrow {
    display: inline-block;
    padding: 0.35rem 0.75rem;
    border-radius: 999px;
    background: rgba(13, 110, 253, 0.1);
    color: var(--ozs-primary-dark);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

/* ===== Footer ===== */
.ozs-footer {
    border-top: 1px solid var(--ozs-line);
    background: rgba(255, 255, 255, 0.5);
}

/* ===== Admin stat cards ===== */
.stat-card {
    border-radius: 12px;
    border: 1px solid var(--ozs-line);
    background: #fff;
    transition: all 0.2s ease;
}

.stat-card:hover {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

/* ===== Utility ===== */
.text-secondary {
    color: var(--ozs-soft) !important;
}

.info-card {
    height: 100%;
    padding: 1rem 1.1rem;
    border-radius: 18px;
    border: 1px solid var(--ozs-line);
    background: rgba(255, 255, 255, 0.66);
}

/* ===== Responsive ===== */
@media (max-width: 767px) {
    .surface-card,
    .hero-panel {
        border-radius: 16px;
    }

    .ozs-category-card {
        border-radius: 12px;
    }

    h1.display-5 {
        font-size: 1.5rem;
    }
}

/* ===== Admin tables ===== */
.table th {
    white-space: nowrap;
    font-size: 0.85rem;
}

.table td {
    vertical-align: middle;
    font-size: 0.9rem;
}

/* ===== Flow buttons ===== */
.btn-outline-primary.btn-lg {
    border-radius: 12px;
    padding: 1rem 1.5rem;
    font-size: 1.1rem;
    text-align: left;
}

/* ===== Accordion ===== */
.accordion-button:not(.collapsed) {
    background: rgba(13, 110, 253, 0.05);
    color: var(--ozs-primary-dark);
}