:root {
    --primary: #0284c7; /* Ocean Blue */
    --primary-hover: #0369a1;
    --secondary: #f97316; /* Sunset Coral */
    --secondary-hover: #ea580c;
    --accent: #10b981; /* Palm Green */
    --background: #f8fafc; /* Soft Sand */
    --surface: #ffffff;
    --surface-border: #e2e8f0;
    --text: #0f172a; /* Deep Slate */
    --text-muted: #64748b;
    --radius: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
    --shadow-hover: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@300;400;500;700;900&display=swap');

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Noto Sans KR', sans-serif;
}

body {
    font-size: 15px;
    background-color: var(--background);
    background-image: 
        radial-gradient(at 0% 0%, rgba(2, 132, 199, 0.05) 0px, transparent 50%),
        radial-gradient(at 100% 0%, rgba(249, 115, 22, 0.05) 0px, transparent 50%);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--surface-border);
}

h1, h2, h3, h4 {
    font-weight: 700;
    letter-spacing: -0.025em;
    color: var(--text);
}

.logo {
    font-size: 1.75rem;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 800;
}

.btn {
    background: var(--primary);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    box-shadow: 0 4px 6px -1px rgba(2, 132, 199, 0.2);
}

.btn:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(2, 132, 199, 0.3);
}

.btn-secondary {
    background: #f1f5f9;
    border: 1px solid var(--surface-border);
    color: var(--text-muted);
}

.btn-secondary:hover {
    background: #e2e8f0;
    color: var(--text);
    border-color: #cbd5e1;
}

.btn-danger {
    background: #ef4444;
    box-shadow: 0 4px 6px -1px rgba(239, 68, 68, 0.2);
}

.btn-danger:hover {
    background: #dc2626;
    box-shadow: 0 10px 15px -3px rgba(239, 68, 68, 0.3);
}

.card {
    background: var(--surface);
    border: 1px solid var(--surface-border);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    transition: var(--transition);
    box-shadow: var(--shadow);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: #cbd5e1;
}

/* Grid Layouts */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

/* Forms */
.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 600;
}

.form-control {
    width: 100%;
    background: #ffffff;
    border: 1px solid var(--surface-border);
    border-radius: 10px;
    padding: 0.75rem 1rem;
    color: var(--text);
    font-size: 1rem;
    transition: var(--transition);
    box-shadow: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.2);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 23, 42, 0.5);
    backdrop-filter: blur(4px);
    z-index: 100;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: #ffffff;
    border: 1px solid var(--surface-border);
    border-radius: var(--radius);
    padding: 2rem;
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

/* Tabs */
.tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    border-bottom: 2px solid var(--surface-border);
    padding-bottom: 0.5rem;
}

.tab-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.1rem;
    font-weight: 600;
    padding: 0.5rem 1rem;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.tab-btn:hover {
    color: var(--primary);
}

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

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -0.65rem;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--primary);
    border-radius: 3px 3px 0 0;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Timeline for Items */
.timeline {
    position: relative;
    padding-left: 2.5rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0.75rem;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--surface-border);
}

.timeline-item {
    position: relative;
    margin-bottom: 2rem;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -2.15rem;
    top: 0.25rem;
    width: 1.25rem;
    height: 1.25rem;
    border-radius: 50%;
    background: #ffffff;
    border: 4px solid var(--primary);
    z-index: 1;
}

.timeline-item.accommodation::before { border-color: var(--primary); }
.timeline-item.place::before { border-color: var(--accent); }
.timeline-item.food::before { border-color: var(--secondary); }

/* Cloud Gallery */
.gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
}

.gallery-item {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    aspect-ratio: 1;
    cursor: pointer;
    box-shadow: var(--shadow);
    border: 4px solid #ffffff;
    transition: var(--transition);
}

.gallery-item img, .gallery-item video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.gallery-item:hover {
    transform: scale(1.05) rotate(1deg);
    box-shadow: var(--shadow-hover);
}

.gallery-item .overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0,0,0,0.7));
    padding: 0.75rem;
    opacity: 0;
    transition: var(--transition);
}

.gallery-item:hover .overlay {
    opacity: 1;
}

/* Expense Summary */
.expense-summary {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: #f0fdf4;
    border: 1px solid #bbf7d0;
    padding: 1.5rem;
    border-radius: var(--radius);
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
}

.expense-bar {
    height: 12px;
    background: #e2e8f0;
    border-radius: 6px;
    overflow: hidden;
    margin-top: 0.5rem;
}

.expense-progress {
    height: 100%;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    width: 0%;
    transition: width 0.5s ease;
}

/* Badges */
.badge {
    padding: 0.35rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.badge-accommodation { background: #e0f2fe; color: #0369a1; }
.badge-place { background: #dcfce7; color: #15803d; }
.badge-food { background: #ffedd5; color: #c2410c; }
.badge-settlement { background: #fef9c3; color: #a16207; }
.badge-other { background: #f1f5f9; color: #475569; }

/* Responsive */
@media (max-width: 768px) {
    .container { padding: 1rem; }
    header { flex-direction: column; gap: 1rem; text-align: center; }
    .tabs { overflow-x: auto; padding-bottom: 1rem; }
}

/* Top Navigation */
.top-nav {
    background: #ffffff;
    border-bottom: 1px solid var(--surface-border);
    padding: 0.75rem 2rem;
    position: sticky;
    top: 0;
    z-index: 50;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-menu {
    display: flex;
    gap: 2rem;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 600;
    font-size: 1.05rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0;
    position: relative;
    transition: var(--transition);
}

.nav-menu a:hover, .nav-menu a.active {
    color: var(--primary);
}

.nav-menu a.active::after {
    content: '';
    position: absolute;
    bottom: -0.75rem;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--primary);
    border-radius: 3px 3px 0 0;
}

.nav-user {
    display: flex;
    align-items: center;
    gap: 1rem;
}

@media (max-width: 768px) {
    .top-nav { padding: 0.75rem 1rem; }
    .nav-menu { gap: 1rem; }
}

/* Dropdown Menu */
.dropdown-menu a:hover {
    background-color: #f8fafc !important;
    color: var(--primary) !important;
}

.dropdown-menu {
    animation: fadeIn 0.2s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}