:root {
    --color-bg: #FAF7F1;
    --color-bg-card: #FFFFFF;
    --color-navy: #1F2A44;
    --color-navy-light: #3B4A6B;
    --color-text: #24304A;
    --color-text-muted: #6B7280;
    --color-gold: #B8912B;
    --color-gold-light: #E9DCB5;
    --color-beige: #F0E9DA;
    --color-border: #E4DCC8;
    --color-free-bg: #FFFFFF;
    --color-occupied-bg: #F5EEDB;
    --color-error-bg: #FBEAEA;
    --color-error-text: #8A3B3B;
    --radius-md: 12px;
    --radius-lg: 18px;
    --shadow-soft: 0 2px 10px rgba(31, 42, 68, 0.06);
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
}

body {
    background: var(--color-bg);
    color: var(--color-text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 720px;
    margin: 0 auto;
    padding: 0 16px;
}

/* Header */

.site-header {
    background: var(--color-navy);
    padding: 16px 0;
}

.header-inner {
    display: flex;
    align-items: center;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #FFFFFF;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.1rem;
}

.brand-symbol {
    color: var(--color-gold);
    font-size: 1.2rem;
}

/* Hero */

.hero {
    text-align: center;
    padding: 32px 0 8px;
}

.hero h1 {
    font-size: 2rem;
    margin: 0 0 12px;
    color: var(--color-navy);
}

.hero-subtitle {
    font-size: 1.05rem;
    color: var(--color-text);
    margin: 0 0 8px;
}

.hero-note {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    margin: 0;
}

.stats-block {
    text-align: center;
    background: var(--color-beige);
    border-radius: var(--radius-md);
    padding: 12px 16px;
    margin: 20px 0;
    font-size: 0.95rem;
}

/* Alerts */

.alert {
    border-radius: var(--radius-md);
    padding: 12px 16px;
    margin: 16px 0;
    font-size: 0.95rem;
}

.alert-error {
    background: var(--color-error-bg);
    color: var(--color-error-text);
}

/* Section titles */

.section-title {
    font-size: 1.2rem;
    color: var(--color-navy);
    margin: 24px 0 12px;
}

/* Calendar */

.calendar-weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    text-align: center;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-bottom: 6px;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 6px;
}

.calendar-cell-empty {
    visibility: hidden;
}

.calendar-day {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 10px 4px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    cursor: pointer;
    font: inherit;
    color: var(--color-text);
    transition: border-color 0.15s ease, background 0.15s ease;
}

.calendar-day:hover,
.calendar-day:focus-visible {
    border-color: var(--color-gold);
    outline: none;
}

.calendar-day.is-selected {
    border-color: var(--color-navy);
    background: var(--color-beige);
}

.day-number {
    font-size: 0.95rem;
    font-weight: 600;
}

.day-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: transparent;
}

.day-dot.dot-free {
    background: #5B8A63;
}

.day-dot.dot-full {
    background: var(--color-gold);
}

.calendar-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-top: 12px;
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.calendar-legend span {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

/* Slots */

.slots-section.is-hidden,
.registration-section.is-hidden {
    display: none;
}

.slots-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.slot-card {
    background: var(--color-free-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 14px 10px;
    text-align: center;
    cursor: pointer;
    font: inherit;
    color: var(--color-text);
    box-shadow: var(--shadow-soft);
    transition: border-color 0.15s ease, background 0.15s ease;
}

.slot-card:hover,
.slot-card:focus-visible {
    border-color: var(--color-gold);
    outline: none;
}

.slot-card.is-selected {
    border-color: var(--color-navy);
    background: var(--color-beige);
}

.slot-card.is-occupied {
    background: var(--color-occupied-bg);
}

.slot-time {
    display: block;
    font-weight: 600;
    font-size: 1rem;
}

.slot-status {
    display: block;
    font-size: 0.78rem;
    color: var(--color-text-muted);
    margin-top: 4px;
}

.slots-legend {
    font-size: 0.82rem;
    color: var(--color-text-muted);
    margin-top: 14px;
}

/* Registration form */

.registration-section {
    margin-top: 8px;
}

.selected-info {
    background: var(--color-beige);
    border-radius: var(--radius-md);
    padding: 10px 14px;
    font-size: 0.9rem;
    margin-bottom: 16px;
}

.field {
    margin-bottom: 14px;
}

.field label {
    display: block;
    font-size: 0.88rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--color-navy);
}

.field input[type="text"],
.field input[type="password"] {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    background: var(--color-bg-card);
    color: var(--color-text);
}

.field input:focus {
    outline: none;
    border-color: var(--color-gold);
}

.hp-field {
    position: absolute;
    left: -9999px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

/* Buttons */

.btn {
    display: inline-block;
    border: none;
    border-radius: var(--radius-md);
    padding: 13px 22px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
}

.btn-block {
    display: block;
    width: 100%;
}

.btn-primary {
    background: var(--color-navy);
    color: #FFFFFF;
}

.btn-primary:disabled {
    background: var(--color-navy-light);
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary:not(:disabled):hover {
    background: var(--color-navy-light);
}

.btn-secondary {
    background: var(--color-beige);
    color: var(--color-navy);
}

.btn-danger {
    background: #F5EAEA;
    color: var(--color-error-text);
}

.btn-small {
    padding: 8px 14px;
    font-size: 0.85rem;
}

/* Success page */

.success-card {
    text-align: center;
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-soft);
    padding: 36px 20px;
    margin: 32px 0;
}

.success-icon {
    font-size: 2rem;
    color: var(--color-gold);
    margin-bottom: 10px;
}

.success-details {
    font-size: 1.05rem;
    margin: 12px 0;
}

.success-note {
    color: var(--color-text-muted);
    margin-bottom: 24px;
}

/* Admin */

.admin-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 16px;
    font-size: 0.9rem;
}

.admin-page h1 {
    font-size: 1.3rem;
    color: var(--color-navy);
}

.admin-summary {
    margin-bottom: 16px;
}

.admin-back-link {
    display: inline-block;
    margin-bottom: 12px;
    color: var(--color-navy);
    text-decoration: none;
    font-size: 0.9rem;
}

.admin-day-list {
    list-style: none;
    margin: 20px 0 0;
    padding: 0;
}

.admin-day-list li {
    border-bottom: 1px solid var(--color-border);
}

.admin-day-list a {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 4px;
    text-decoration: none;
    color: var(--color-text);
}

.admin-day-count {
    color: var(--color-text-muted);
    font-size: 0.85rem;
}

.admin-empty {
    color: var(--color-text-muted);
    margin-top: 20px;
}

.admin-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 16px;
    font-size: 0.88rem;
}

.admin-table th,
.admin-table td {
    text-align: left;
    padding: 10px 8px;
    border-bottom: 1px solid var(--color-border);
}

.delete-form {
    margin: 0;
}

.admin-login {
    max-width: 360px;
    margin: 40px auto;
}

.admin-login h1 {
    font-size: 1.2rem;
    text-align: center;
    color: var(--color-navy);
}

.admin-login-form {
    margin-top: 20px;
}

/* Footer */

.site-footer {
    margin-top: 40px;
    padding: 20px 0 40px;
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.82rem;
}

/* Responsive breakpoints */

@media (min-width: 480px) {
    .slots-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 640px) {
    .hero h1 {
        font-size: 2.3rem;
    }

    .slots-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (min-width: 900px) {
    .container {
        max-width: 860px;
    }

    .slots-grid {
        grid-template-columns: repeat(6, 1fr);
    }
}