/* ============================================
   CSS Variables & Theme System
   ============================================ */
:root {
    /* Light Theme Colors - Soft Pastels */
    --bg-primary: #FFF5F7;
    --bg-secondary: #FFFFFF;
    --bg-tertiary: #FFF0F3;
    --text-primary: #2D3142;
    --text-secondary: #6B7280;
    --text-tertiary: #9CA3AF;
    
    /* Accent Colors */
    --accent-primary: #FF8FA3;
    --accent-secondary: #FFB3C1;
    --accent-tertiary: #FFD6E0;
    
    /* Mood Colors */
    --mood-ecstatic: #FFD93D;
    --mood-happy: #6BCB77;
    --mood-calm: #A8D8EA;
    --mood-neutral: #C7C7C7;
    --mood-anxious: #FFA07A;
    --mood-sad: #9FA8DA;
    --mood-angry: #FF6B6B;
    --mood-tired: #B4A7D6;
    
    /* UI Elements */
    --shadow-sm: 0 2px 8px rgba(255, 143, 163, 0.08);
    --shadow-md: 0 4px 16px rgba(255, 143, 163, 0.12);
    --shadow-lg: 0 8px 32px rgba(255, 143, 163, 0.16);
    --border-radius: 24px;
    --border-radius-sm: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
}

[data-theme="dark"] {
    --bg-primary: #1A1625;
    --bg-secondary: #251E35;
    --bg-tertiary: #2D2640;
    --text-primary: #F5F3F7;
    --text-secondary: #C7C3D0;
    --text-tertiary: #9B97A3;
    
    --accent-primary: #FF6B8A;
    --accent-secondary: #FF8FA3;
    --accent-tertiary: #3D3550;
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
}

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

body {
    font-family: 'Nunito', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background 0.5s ease;
}

/* ============================================
   Background Decorations
   ============================================ */
.bg-decoration {
    position: fixed;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    pointer-events: none;
    z-index: 0;
    animation: float 20s infinite ease-in-out;
}

.blob-1 {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, #FFB3C1 0%, #FF8FA3 100%);
    top: -100px;
    right: -100px;
    animation-delay: 0s;
}

.blob-2 {
    width: 500px;
    height: 500px;
    background: linear-gradient(135deg, #A8D8EA 0%, #9FA8DA 100%);
    bottom: -150px;
    left: -150px;
    animation-delay: 5s;
}

.blob-3 {
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, #FFD93D 0%, #6BCB77 100%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: 10s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(30px, -30px) rotate(120deg); }
    66% { transform: translate(-20px, 20px) rotate(240deg); }
}

/* ============================================
   Header
   ============================================ */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--bg-secondary);
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow-sm);
    animation: slideDown 0.6s ease;
}

@keyframes slideDown {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.logo-icon {
    width: 32px;
    height: 32px;
    stroke: var(--accent-primary);
    animation: heartbeat 2s infinite ease-in-out;
}

@keyframes heartbeat {
    0%, 100% { transform: scale(1); }
    10% { transform: scale(1.1); }
    20% { transform: scale(1); }
    30% { transform: scale(1.1); }
    40% { transform: scale(1); }
}

.logo-text {
    font-family: 'Caveat', cursive;
    font-size: 32px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    padding: 2px 4px;
}

.header-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.btn-icon {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: none;
    background: var(--bg-tertiary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    position: relative;
}

.btn-icon:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    background: var(--accent-tertiary);
}

.btn-icon svg {
    width: 20px;
    height: 20px;
    stroke: var(--text-primary);
}

#themeToggle .theme-dark {
    display: none;
}

[data-theme="dark"] #themeToggle .theme-light {
    display: none;
}

[data-theme="dark"] #themeToggle .theme-dark {
    display: block;
}

/* ============================================
   Main Container
   ============================================ */
.main-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: var(--spacing-lg);
    position: relative;
    z-index: 1;
}

/* ============================================
   Sidebar Navigation
   ============================================ */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    animation: slideRight 0.6s ease 0.2s backwards;
}

@keyframes slideRight {
    from {
        transform: translateX(-50px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-align: left;
}

.nav-item:hover {
    background: var(--bg-tertiary);
    transform: translateX(4px);
}

.nav-item.active {
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    color: white;
    box-shadow: var(--shadow-md);
}

.nav-item svg {
    width: 20px;
    height: 20px;
    stroke: currentColor;
    flex-shrink: 0;
}

/* ============================================
   Content Area
   ============================================ */
.content-area {
    position: relative;
}

.view {
    display: none;
    animation: fadeIn 0.5s ease;
}

.view.active {
    display: block;
}

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

.view-header {
    margin-bottom: var(--spacing-lg);
    animation: slideUp 0.6s ease 0.3s backwards;
}

@keyframes slideUp {
    from {
        transform: translateY(30px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.view-title {
    font-family: 'Caveat', cursive;
    font-size: 48px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    line-height: 1.2;
}

.view-subtitle {
    color: var(--text-secondary);
    font-size: 18px;
}

/* ============================================
   Mood Selector Card
   ============================================ */
.mood-selector-card {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-md);
    animation: slideUp 0.6s ease 0.4s backwards;
}

.card-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.mood-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-sm);
}

.mood-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-sm);
    border: 2px solid transparent;
    background: var(--bg-tertiary);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.mood-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: currentColor;
    opacity: 0.1;
    transform: translate(-50%, -50%);
    transition: width 0.6s ease, height 0.6s ease;
}

.mood-btn:hover::before {
    width: 300px;
    height: 300px;
}

.mood-btn:hover {
    transform: translateY(-4px) scale(1.05);
    box-shadow: var(--shadow-lg);
}

.mood-btn.selected {
    border-color: currentColor;
    box-shadow: 0 0 0 4px rgba(255, 143, 163, 0.2);
}

.mood-emoji {
    font-size: 48px;
    position: relative;
    z-index: 1;
    animation: bounce 0.6s ease;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.mood-label {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    position: relative;
    z-index: 1;
}

/* ============================================
   Journal Entry Card
   ============================================ */
.journal-entry-card {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-md);
    animation: slideUp 0.6s ease;
}

.journal-textarea {
    width: 100%;
    min-height: 200px;
    padding: var(--spacing-md);
    border-radius: var(--border-radius-sm);
    border: 2px solid var(--bg-tertiary);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: 'Nunito', sans-serif;
    font-size: 16px;
    resize: vertical;
    transition: var(--transition);
    margin-bottom: var(--spacing-md);
}

.journal-textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 4px rgba(255, 143, 163, 0.1);
}

.journal-textarea::placeholder {
    color: var(--text-tertiary);
    font-style: italic;
}

/* ============================================
   Tags Section
   ============================================ */
.tags-section {
    margin-bottom: var(--spacing-md);
}

.tags-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.tags-container {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.tag-chip {
    padding: 10px 16px;
    border-radius: 100px;
    border: 2px solid var(--bg-tertiary);
    background: var(--bg-primary);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.tag-chip:hover {
    transform: translateY(-2px);
    border-color: var(--accent-primary);
}

.tag-chip.active {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: white;
}

/* ============================================
   Buttons
   ============================================ */
.entry-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: flex-end;
}

.btn {
    padding: 12px 24px;
    border-radius: 100px;
    border: none;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.btn svg {
    width: 18px;
    height: 18px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    color: white;
    box-shadow: var(--shadow-sm);
}

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

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: var(--accent-tertiary);
}

.btn-danger {
    background: #FF6B6B;
    color: white;
}

.btn-danger:hover {
    background: #FF5252;
    transform: translateY(-2px);
}

/* ============================================
   Stats Cards
   ============================================ */
.today-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    animation: slideUp 0.6s ease 0.5s backwards;
}

.stat-card {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.stat-icon {
    font-size: 48px;
}

.stat-value {
    font-size: 36px;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1;
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ============================================
   Journal View
   ============================================ */
.journal-filters {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.filter-select {
    padding: 12px 16px;
    border-radius: var(--border-radius-sm);
    border: 2px solid var(--bg-tertiary);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.filter-select:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.journal-entries {
    margin-top: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.journal-entry {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    animation: slideUp 0.4s ease backwards;
}

.journal-entry:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.entry-mood {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 24px;
}

.entry-mood-label {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.entry-date {
    font-size: 14px;
    color: var(--text-tertiary);
}

.entry-content {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-sm);
}

.entry-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-sm);
}

.entry-tag {
    padding: 6px 12px;
    border-radius: 100px;
    background: var(--accent-tertiary);
    color: var(--text-primary);
    font-size: 12px;
    font-weight: 500;
}

.entry-actions-btns {
    display: flex;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-sm);
}

.btn-small {
    padding: 6px 12px;
    font-size: 12px;
    border-radius: 100px;
}

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

.empty-state svg {
    width: 64px;
    height: 64px;
    stroke: var(--text-tertiary);
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.empty-state p {
    font-size: 18px;
    margin-bottom: var(--spacing-xs);
}

.empty-subtitle {
    font-size: 14px;
    color: var(--text-tertiary);
}

.empty-state-small {
    padding: var(--spacing-lg);
    text-align: center;
    color: var(--text-tertiary);
}

.empty-state-small p {
    font-size: 14px;
}

/* ============================================
   Insights View
   ============================================ */
.insights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-md);
}

.insight-card {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    animation: slideUp 0.6s ease backwards;
}

.insight-card:nth-child(1) { animation-delay: 0.1s; }
.insight-card:nth-child(2) { animation-delay: 0.2s; }
.insight-card:nth-child(3) { animation-delay: 0.3s; }
.insight-card:nth-child(4) { animation-delay: 0.4s; }

.insight-card canvas {
    margin-top: var(--spacing-md);
    max-height: 300px;
}

.tags-stats {
    margin-top: var(--spacing-md);
}

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

.tag-stat-label {
    font-weight: 600;
    color: var(--text-primary);
}

.tag-stat-count {
    color: var(--text-secondary);
    font-size: 14px;
}

.trends-list {
    margin-top: var(--spacing-md);
}

.trend-item {
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    background: var(--bg-primary);
    border-radius: var(--border-radius-sm);
    border-left: 4px solid var(--accent-primary);
}

.trend-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.trend-description {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ============================================
   Settings View
   ============================================ */
.settings-section {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-md);
    animation: slideUp 0.6s ease backwards;
}

.settings-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--bg-tertiary);
}

.setting-item:last-child {
    border-bottom: none;
}

.setting-label {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.setting-description {
    font-size: 14px;
    color: var(--text-secondary);
}

.toggle-switch {
    position: relative;
    display: inline-block;
    width: 52px;
    height: 28px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--bg-tertiary);
    transition: var(--transition);
    border-radius: 100px;
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: var(--transition);
    border-radius: 50%;
}

input:checked + .toggle-slider {
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
}

input:checked + .toggle-slider:before {
    transform: translateX(24px);
}

.time-input {
    padding: 10px 16px;
    border-radius: var(--border-radius-sm);
    border: 2px solid var(--bg-tertiary);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 16px;
    cursor: pointer;
}

.about-text {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

/* ============================================
   Toast Notifications
   ============================================ */
.toast {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    background: var(--bg-secondary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-sm);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transform: translateY(200px);
    opacity: 0;
    transition: var(--transition);
    z-index: 1000;
    max-width: 400px;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

.toast-icon {
    width: 24px;
    height: 24px;
    stroke: var(--accent-primary);
    flex-shrink: 0;
}

.toast-message {
    color: var(--text-primary);
    font-weight: 500;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 968px) {
    .main-container {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        flex-direction: row;
        overflow-x: auto;
        padding-bottom: var(--spacing-sm);
    }
    
    .nav-item span {
        display: none;
    }
    
    .nav-item {
        padding: var(--spacing-sm);
        min-width: 48px;
        justify-content: center;
    }
    
    .insights-grid {
        grid-template-columns: 1fr;
    }
    
    .view-title {
        font-size: 36px;
    }
    
    .mood-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .journal-filters {
        flex-direction: column;
    }
}

@media (max-width: 640px) {
    .main-container {
        padding: var(--spacing-md);
    }
    
    .mood-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .today-stats {
        grid-template-columns: 1fr;
    }
    
    .view-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .toast {
        left: var(--spacing-md);
        right: var(--spacing-md);
        bottom: var(--spacing-md);
    }
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
    .header,
    .sidebar,
    .btn,
    .toast {
        display: none;
    }
    
    .main-container {
        grid-template-columns: 1fr;
    }
    
    .bg-decoration {
        display: none;
    }
}