:root {
    --app-primary: #0f6cbd;
    --app-primary-dark: #0b4f8a;
    --app-primary-light: #e8f1fa;
    --app-accent: #0f9b8e;
    --app-surface: #ffffff;
    --app-body-bg: #f4f6f9;
    --app-border: #e3e8ef;
    --app-text: #1f2933;
    --app-muted: #667085;
    --app-radius: 12px;
    --app-shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 4px 16px rgba(16, 24, 40, .06);
}

html {
    font-size: 15px;
    position: relative;
    min-height: 100%;
}

@media (min-width: 768px) {
    html {
        font-size: 16px;
    }
}

body {
    font-family: 'Roboto', 'Segoe UI', system-ui, -apple-system, sans-serif;
    background-color: var(--app-body-bg);
    color: var(--app-text);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    margin: 0;
}

h1, h2, h3, h4, h5, h6,
.navbar-brand {
    font-weight: 500;
    letter-spacing: -.01em;
}

h1 {
    font-size: clamp(1.5rem, 1.2rem + 1.2vw, 2rem);
}

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

a:hover {
    color: var(--app-primary-dark);
    text-decoration: underline;
}

.btn:focus, .btn:active:focus,
.btn-link.nav-link:focus,
.form-control:focus,
.form-select:focus,
.form-check-input:focus {
    box-shadow: 0 0 0 .2rem rgba(15, 108, 189, .25);
}

.btn-primary {
    --bs-btn-bg: var(--app-primary);
    --bs-btn-border-color: var(--app-primary);
    --bs-btn-hover-bg: var(--app-primary-dark);
    --bs-btn-hover-border-color: var(--app-primary-dark);
    --bs-btn-active-bg: var(--app-primary-dark);
    --bs-btn-active-border-color: var(--app-primary-dark);
}

.btn-outline-primary {
    --bs-btn-color: var(--app-primary);
    --bs-btn-border-color: var(--app-primary);
    --bs-btn-hover-bg: var(--app-primary);
    --bs-btn-hover-border-color: var(--app-primary);
}

/* Header */
.app-header {
    background: linear-gradient(120deg, var(--app-primary) 0%, var(--app-primary-dark) 55%, var(--app-accent) 160%);
    box-shadow: var(--app-shadow);
    position: sticky;
    top: 0;
    z-index: 1030;
}

.app-header .navbar-brand {
    display: flex;
    align-items: center;
    gap: .625rem;
    color: #fff;
    font-size: 1.1rem;
}

.app-header .navbar-brand:hover {
    color: #fff;
    text-decoration: none;
}

.app-header .brand-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.25rem;
    height: 2.25rem;
    border-radius: 10px;
    background: rgba(255, 255, 255, .18);
    font-size: 1.15rem;
}

.app-header .nav-link {
    color: rgba(255, 255, 255, .82);
    border-radius: 8px;
    padding: .45rem .8rem;
    display: flex;
    align-items: center;
    gap: .4rem;
    transition: background-color .15s ease, color .15s ease;
}

.app-header .nav-link:hover,
.app-header .nav-link:focus {
    color: #fff;
    background-color: rgba(255, 255, 255, .12);
    text-decoration: none;
}

.app-header .nav-link.active {
    color: #fff;
    background-color: rgba(255, 255, 255, .2);
    font-weight: 500;
}

.app-header .navbar-toggler {
    border-color: rgba(255, 255, 255, .4);
}

.app-header .navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255,255,255,0.9%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* Main */
.app-main {
    flex: 1 0 auto;
    padding-block: 1.75rem 3rem;
}

.page-header {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.page-header h1 {
    margin-bottom: .25rem;
}

.page-header .text-muted {
    color: var(--app-muted) !important;
}

.page-actions {
    display: flex;
    flex-wrap: wrap;
    gap: .5rem;
}

/* Cards */
.app-card {
    background: var(--app-surface);
    border: 1px solid var(--app-border);
    border-radius: var(--app-radius);
    box-shadow: var(--app-shadow);
    padding: 1.5rem;
    height: 100%;
}

.app-card-title {
    font-size: 1rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: .06em;
    color: var(--app-muted);
    margin-bottom: 1.15rem;
    padding-bottom: .65rem;
    border-bottom: 1px solid var(--app-border);
}

/* Definition lists inside detail cards */
.detail-list {
    margin: 0;
}

.detail-list dt {
    font-weight: 400;
    color: var(--app-muted);
    font-size: .875rem;
}

.detail-list dd {
    font-weight: 500;
    margin-bottom: .9rem;
    word-break: break-word;
}

/* Forms */
.form-label {
    font-weight: 500;
    font-size: .9rem;
    margin-bottom: .3rem;
}

.form-control, .form-select {
    border-color: var(--app-border);
    border-radius: 8px;
    padding: .5rem .75rem;
}

fieldset legend {
    font-size: 1rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: .06em;
    color: var(--app-muted);
}

.form-actions {
    background: var(--app-surface);
    border: 1px solid var(--app-border);
    border-radius: var(--app-radius);
    box-shadow: var(--app-shadow);
    padding: 1rem 1.25rem;
    margin-top: 1.5rem;
    display: flex;
    flex-wrap: wrap;
    gap: .5rem;
    align-items: center;
}

/* Tables */
.table-card {
    background: var(--app-surface);
    border: 1px solid var(--app-border);
    border-radius: var(--app-radius);
    box-shadow: var(--app-shadow);
    overflow: hidden;
}

.table-card .table {
    margin-bottom: 0;
}

.table-card .table > thead th {
    background-color: var(--app-primary-light);
    color: var(--app-primary-dark);
    font-weight: 500;
    font-size: .8rem;
    text-transform: uppercase;
    letter-spacing: .05em;
    border-bottom: 1px solid var(--app-border);
    white-space: nowrap;
}

.table-card .table > tbody td {
    vertical-align: middle;
    border-color: var(--app-border);
}

.filter-card {
    background: var(--app-surface);
    border: 1px solid var(--app-border);
    border-radius: var(--app-radius);
    box-shadow: var(--app-shadow);
    padding: 1.25rem;
    margin-bottom: 1.25rem;
}

.photo-thumbnail img {
    border-radius: 10px;
    border-color: var(--app-border);
    cursor: zoom-in;
    transition: transform .15s ease, box-shadow .15s ease;
}

.photo-thumbnail:hover img {
    transform: translateY(-2px);
    box-shadow: var(--app-shadow);
}

/* Footer */
.app-footer {
    flex-shrink: 0;
    background-color: #10202e;
    color: rgba(255, 255, 255, .72);
    padding-block: 2rem 1.25rem;
    margin-top: auto;
}

.app-footer h2 {
    font-size: .85rem;
    text-transform: uppercase;
    letter-spacing: .08em;
    color: #fff;
    margin-bottom: .75rem;
}

.app-footer a {
    color: rgba(255, 255, 255, .72);
}

.app-footer a:hover {
    color: #fff;
}

.app-footer .footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, .12);
    margin-top: 1.5rem;
    padding-top: 1rem;
    font-size: .85rem;
}

/* Auth pages */
.auth-card {
    max-width: 26rem;
    margin-inline: auto;
}

.form-floating > .form-control-plaintext::placeholder,
.form-floating > .form-control::placeholder {
    color: var(--bs-secondary-color);
    text-align: end;
}

.form-floating > .form-control-plaintext:focus::placeholder,
.form-floating > .form-control:focus::placeholder {
    text-align: start;
}

@media (max-width: 575.98px) {
    .app-card, .filter-card {
        padding: 1.15rem;
    }

    .page-actions {
        width: 100%;
    }

    .page-actions .btn {
        flex: 1 1 auto;
    }
}