/* ========================================
   Birthday Trip — Warm & Refined Design
   ======================================== */

:root {
    /* Warm Color Palette */
    --bg: #faf8f5;
    --bg-card: #ffffff;
    --bg-warm: #fff9f3;

    --text-primary: #2d2a26;
    --text-secondary: #6b6560;
    --text-muted: #9c958d;

    --accent: #c46d3d;
    --accent-light: #e8a06a;
    --accent-glow: rgba(196, 109, 61, 0.12);

    --border: #ebe7e1;
    --border-light: #f5f2ed;

    --shadow-sm: 0 1px 2px rgba(45, 42, 38, 0.04);
    --shadow-md: 0 4px 12px rgba(45, 42, 38, 0.06);
    --shadow-lg: 0 8px 24px rgba(45, 42, 38, 0.08);

    --radius: 14px;
    --radius-sm: 10px;

    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text-primary);
    line-height: 1.65;
    min-height: 100vh;
}

/* ========================================
   Header
   ======================================== */

.header {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(8px);
    background: rgba(255, 255, 255, 0.92);
}

.header-content {
    max-width: 680px;
    margin: 0 auto;
    padding: 1rem 1.5rem;
}

.trip-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.trip-date {
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--text-primary);
    letter-spacing: 0.02em;
}

.trip-days {
    font-size: 0.8125rem;
    color: var(--text-muted);
    padding: 0.25rem 0.75rem;
    background: var(--border-light);
    border-radius: 1rem;
}

/* ========================================
   Tab Navigation
   ======================================== */

.tab-nav {
    position: relative;
    display: flex;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    max-width: 680px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.tab {
    position: relative;
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem 0;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-family: inherit;
    font-size: 0.9375rem;
    font-weight: 500;
    cursor: pointer;
    transition: color var(--transition);
    z-index: 1;
}

.tab:hover {
    color: var(--text-secondary);
}

.tab.active {
    color: var(--accent);
}

.tab-icon {
    display: flex;
    opacity: 0.9;
}

.tab-indicator {
    position: absolute;
    bottom: 0;
    left: 1.5rem;
    width: calc(33.33% - 1.5rem);
    height: 2px;
    background: var(--accent);
    border-radius: 2px;
    transition: transform var(--transition);
}

/* ========================================
   Panel
   ======================================== */

.panel {
    display: none;
    opacity: 0;
    animation: fadeIn 0.4s ease forwards;
}

.panel.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.panel-inner {
    max-width: 680px;
    margin: 0 auto;
    padding: 1.75rem 1.5rem 3rem;
}

/* ========================================
   Schedule — Day
   ======================================== */

.day {
    margin-bottom: 2.75rem;
}

.day:last-child {
    margin-bottom: 1.5rem;
}

.day-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.day-number {
    display: flex;
    align-items: baseline;
    gap: 0.625rem;
}

.day-num {
    font-family: 'DM Serif Display', Georgia, serif;
    font-size: 2.75rem;
    font-weight: 400;
    line-height: 1;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.day-number.special .day-num {
    color: var(--accent);
}

.day-meta {
    display: flex;
    flex-direction: column;
    gap: 0.125rem;
}

.day-weekday {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.day-month {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.day-badge {
    font-size: 0.6875rem;
    font-weight: 500;
    padding: 0.375rem 0.875rem;
    background: var(--border-light);
    border-radius: 1rem;
    color: var(--text-secondary);
    letter-spacing: 0.03em;
}

.day-badge.highlight {
    background: var(--accent-glow);
    color: var(--accent);
}

/* ========================================
   Schedule — Events
   ======================================== */

.events {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.event {
    display: grid;
    grid-template-columns: 72px 1fr;
    gap: 1.25rem;
}

.event-time {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--accent);
    padding-top: 1.125rem;
    font-variant-numeric: tabular-nums;
}

.event-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.125rem 1.375rem;
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition), border-color var(--transition);
}

.event-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--border);
}

.event-card.highlight {
    background: var(--bg-warm);
    border-color: rgba(196, 109, 61, 0.15);
}

.event-title {
    font-size: 1.0625rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
    letter-spacing: -0.005em;
}

.event-desc {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.event-details {
    margin-top: 0.875rem;
    padding-top: 0.875rem;
    border-top: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}

.detail {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.detail dt {
    line-height: 1.5;
}

.detail dd {
    flex: 1;
}

.event-links {
    display: flex;
    gap: 0.75rem;
    margin-top: 1rem;
}

.link-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.5rem 0.875rem;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--accent);
    background: var(--accent-glow);
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: background var(--transition);
}

.link-btn:hover {
    background: rgba(196, 109, 61, 0.18);
}

.link-btn.secondary {
    background: var(--border-light);
    color: var(--text-secondary);
}

.link-btn.secondary:hover {
    background: var(--border);
}

.link-btn svg {
    opacity: 0.7;
}

/* Birthday Message */
.birthday-msg {
    margin-top: 1.25rem;
    padding: 1.125rem;
    background: linear-gradient(135deg, var(--bg-warm) 0%, #fff5eb 100%);
    border-radius: var(--radius);
    text-align: center;
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--accent);
    letter-spacing: 0.02em;
}

/* ========================================
   Budget
   ======================================== */

.budget-hero {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
    border-radius: var(--radius);
    padding: 1.75rem;
    text-align: center;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-lg);
}

.budget-label {
    display: block;
    font-size: 0.8125rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.85);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 0.375rem;
}

.budget-total {
    font-family: 'DM Serif Display', Georgia, serif;
    font-size: 2.25rem;
    font-weight: 400;
    color: #ffffff;
    letter-spacing: -0.01em;
}

.budget-note {
    display: block;
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.7);
    margin-top: 0.5rem;
    font-weight: 400;
}

.budget-groups {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.budget-group {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.group-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.25rem;
    background: var(--bg);
    border-bottom: 1px solid var(--border-light);
}

.group-icon {
    width: 1.5rem;
    height: 1.5rem;
    border-radius: 0.375rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.group-icon.train { background: #e8f4f8; }
.group-icon.hotel { background: #f3e8f8; }
.group-icon.food { background: #f8f3e8; }
.group-icon.sight { background: #e8f8f3; }
.group-icon.game { background: #f8e8e8; }

.group-name {
    flex: 1;
    font-size: 0.9375rem;
    font-weight: 500;
}

.group-amount {
    font-family: 'DM Serif Display', Georgia, serif;
    font-size: 1.125rem;
    color: var(--accent);
}

.group-items {
    list-style: none;
    padding: 0.625rem 1.25rem;
}

.group-items li {
    display: flex;
    justify-content: space-between;
    padding: 0.625rem 0;
    font-size: 0.9375rem;
    border-bottom: 1px solid var(--border-light);
}

.group-items li:last-child {
    border-bottom: none;
}

.group-items li span:last-child {
    color: var(--text-secondary);
    font-variant-numeric: tabular-nums;
}

/* ========================================
   Route Images
   ======================================== */

.route-images {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.route-image {
    width: 100%;
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition), box-shadow var(--transition);
}

.route-image:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-lg);
}

/* ========================================
   Footer
   ======================================== */

.footer {
    padding: 2rem;
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border-light);
    margin-top: 1rem;
}

/* ========================================
   Responsive
   ======================================== */

@media (max-width: 600px) {
    .header-content {
        padding: 1rem 1.25rem;
    }

    .panel-inner {
        padding: 1.25rem 1.25rem 2.5rem;
    }

    .event {
        grid-template-columns: 1fr;
        gap: 0.625rem;
    }

    .event-time {
        padding-top: 0;
        font-size: 0.8125rem;
    }

    .event-card {
        padding: 1rem 1.125rem;
    }

    .event-links {
        flex-direction: column;
        gap: 0.5rem;
    }

    .link-btn {
        justify-content: center;
    }

    .day-num {
        font-size: 2.25rem;
    }
}