/* ========================================
   Reset & Base Styles
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Pastel Colors */
    --color-primary: #A5D8FF;
    --color-secondary: #FFD6E8;
    --color-success: #B9F6CA;
    --color-warning: #FFF9C4;
    --color-danger: #FFCCBC;
    
    /* Neutral */
    --color-bg: #FAFAFA;
    --color-surface: #FFFFFF;
    --color-text: #333333;
    --color-text-light: #757575;
    --color-border: #E0E0E0;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    
    /* Transitions */
    --transition: 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #FAFAFA 0%, #F0F0F0 100%);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    padding-bottom: 2rem;
}

.container {
    max-width: 640px;
    margin: 0 auto;
    padding: var(--spacing-md);
}

/* ========================================
   Header
   ======================================== */
.header {
    text-align: center;
    padding: var(--spacing-lg) 0;
    margin-bottom: var(--spacing-md);
}

.header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    background: linear-gradient(135deg, #667EEA 0%, #764BA2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--color-text-light);
    font-size: 0.95rem;
}

/* ========================================
   Time Navigation
   ======================================== */
.time-nav {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
    background: var(--color-surface);
    padding: var(--spacing-xs);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.time-btn {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    background: transparent;
    color: var(--color-text-light);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
}

.time-btn:hover {
    background: var(--color-bg);
}

.time-btn.active {
    background: var(--color-primary);
    color: var(--color-text);
    font-weight: 600;
}

.time-btn span {
    font-size: 0.8rem;
}

/* ========================================
   Current Date Display
   ======================================== */
.current-date {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--color-surface);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

/* ========================================
   Action Bar
   ======================================== */
.action-bar {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
}

.btn-primary {
    flex: 1;
    background: linear-gradient(135deg, var(--color-primary) 0%, #74B9FF 100%);
    color: var(--color-text);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-text);
    border: 2px solid var(--color-border);
}

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

.btn-outline {
    background: var(--color-surface);
    color: var(--color-text);
    border: 2px solid var(--color-border);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.9rem;
}

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

/* ========================================
   Category Filter
   ======================================== */
.category-filter {
    display: flex;
    gap: var(--spacing-xs);
    overflow-x: auto;
    padding: var(--spacing-sm) 0;
    margin-bottom: var(--spacing-md);
    -webkit-overflow-scrolling: touch;
}

.category-filter::-webkit-scrollbar {
    height: 4px;
}

.category-filter::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 2px;
}

.category-badge {
    padding: var(--spacing-xs) var(--spacing-md);
    border: 2px solid var(--color-border);
    background: var(--color-surface);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
    transition: var(--transition);
}

.category-badge:hover {
    transform: scale(1.05);
}

.category-badge.active {
    border-color: transparent;
    color: var(--color-text);
    box-shadow: var(--shadow-sm);
}

/* ========================================
   Schedule List
   ======================================== */
.schedule-list {
    min-height: 300px;
}

.schedule-item {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    border-left: 4px solid var(--color-primary);
    transition: var(--transition);
    animation: fadeIn 0.3s ease;
}

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

.schedule-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.schedule-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-sm);
}

.schedule-time {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
}

.schedule-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.icon-btn {
    width: 32px;
    height: 32px;
    border: none;
    background: var(--color-bg);
    border-radius: 50%;
    cursor: pointer;
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.icon-btn:hover {
    background: var(--color-border);
    transform: scale(1.1);
}

.schedule-activity {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.schedule-location,
.schedule-items {
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xs);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.schedule-category {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
    margin-top: var(--spacing-xs);
}

/* ========================================
   Empty State
   ======================================== */
.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--color-text-light);
}

.empty-state-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
}

.empty-state h3 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.empty-state p {
    font-size: 0.95rem;
}

/* ========================================
   Utility Bar
   ======================================== */
.utility-bar {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

.utility-bar .btn {
    flex: 1;
    font-size: 0.85rem;
}

/* ========================================
   Modal
   ======================================== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
    backdrop-filter: blur(4px);
}

.modal.active {
    display: flex;
    animation: fadeIn 0.3s ease;
}

.modal-content {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.modal-header h2 {
    font-size: 1.3rem;
}

.close-btn {
    width: 36px;
    height: 36px;
    border: none;
    background: var(--color-bg);
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.close-btn:hover {
    background: var(--color-danger);
    transform: rotate(90deg);
}

/* ========================================
   Form
   ======================================== */
#scheduleForm,
.category-manager {
    padding: var(--spacing-lg);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    font-size: 0.9rem;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    transition: var(--transition);
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(165, 216, 255, 0.2);
}

.form-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

.form-actions .btn {
    flex: 1;
}

/* ========================================
   Category Manager
   ======================================== */
.input-group {
    display: flex;
    gap: var(--spacing-xs);
}

.input-group input[type="text"] {
    flex: 1;
}

.input-group input[type="color"] {
    width: 50px;
    height: 40px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
}

.category-list {
    margin-top: var(--spacing-lg);
}

.category-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
}

.category-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.category-color-preview {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: 2px solid var(--color-border);
}

.delete-category-btn {
    background: var(--color-danger);
    color: var(--color-text);
    border: none;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    transition: var(--transition);
}

.delete-category-btn:hover {
    opacity: 0.8;
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 480px) {
    .container {
        padding: var(--spacing-sm);
    }
    
    .header h1 {
        font-size: 1.6rem;
    }
    
    .time-btn {
        font-size: 0.8rem;
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .schedule-time {
        font-size: 1.2rem;
    }
    
    .utility-bar {
        flex-direction: column;
    }
    
    .utility-bar .btn {
        width: 100%;
    }
}

/* ========================================
   Utility Classes
   ======================================== */
.text-center {
    text-align: center;
}

.mt-1 {
    margin-top: var(--spacing-md);
}

.mb-1 {
    margin-bottom: var(--spacing-md);
}

.fade-in {
    animation: fadeIn 0.3s ease;
}