/* ============================================
   HABITFLOW - Design System
   Palette: Terracotta Studio
   Typography: Playfair Display + Plus Jakarta Sans
   ============================================ */

:root {
    /* Terracotta Studio Palette */
    --color-primary: #B5563E;
    --color-primary-light: #D4896A;
    --color-primary-dark: #8B442F;
    --color-secondary: #3D2B1F;
    --color-background: #F2E6D9;
    --color-surface: #FFFFFF;
    --color-surface-alt: #FAF6F1;
    --color-text: #3D2B1F;
    --color-text-muted: #8B7355;
    --color-text-light: #A89B8C;
    --color-border: #E8DDD0;
    --color-success: #2D6A1E;
    --color-warning: #B87333;
    
    /* Typography */
    --font-display: 'Playfair Display', Georgia, serif;
    --font-body: 'Plus Jakarta Sans', -apple-system, sans-serif;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(61, 43, 31, 0.05);
    --shadow-md: 0 4px 12px rgba(61, 43, 31, 0.08);
    --shadow-lg: 0 8px 24px rgba(61, 43, 31, 0.12);
    --shadow-xl: 0 16px 48px rgba(61, 43, 31, 0.15);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

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

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

body {
    font-family: var(--font-body);
    background: var(--color-background);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
}

/* ============================================
   LAYOUT
   ============================================ */

.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background: var(--color-surface);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 100;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-xl) var(--space-xl) var(--space-lg);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: var(--color-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.logo-icon svg {
    width: 22px;
    height: 22px;
}

.logo-text {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text);
}

.nav-menu {
    flex: 1;
    padding: var(--space-md) var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    color: var(--color-text-muted);
    text-decoration: none;
    font-weight: 500;
    transition: all var(--transition-base);
}

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

.nav-item:hover {
    background: var(--color-surface-alt);
    color: var(--color-text);
}

.nav-item.active {
    background: var(--color-primary);
    color: white;
}

.sidebar-footer {
    padding: var(--space-lg) var(--space-xl);
    border-top: 1px solid var(--color-border);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.user-avatar {
    width: 40px;
    height: 40px;
    background: var(--color-primary-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    color: white;
    font-size: 0.875rem;
}

.user-info {
    display: flex;
    flex-direction: column;
}

.user-name {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--color-text);
}

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

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 260px;
    padding: var(--space-2xl);
    min-height: 100vh;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-2xl);
}

.page-title {
    font-family: var(--font-display);
    font-size: 2.25rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-xs);
}

.page-subtitle {
    color: var(--color-text-muted);
    font-size: 1rem;
}

/* ============================================
   COMPONENTS
   ============================================ */

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 0.9375rem;
    cursor: pointer;
    border: none;
    transition: all var(--transition-base);
}

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

.btn-primary {
    background: var(--color-primary);
    color: white;
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--color-surface-alt);
    color: var(--color-text);
}

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

.btn-icon {
    padding: var(--space-sm);
    background: transparent;
    color: var(--color-text-muted);
}

.btn-icon:hover {
    background: var(--color-surface-alt);
    color: var(--color-text);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-lg);
    margin-bottom: var(--space-2xl);
}

.stat-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

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

.stat-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

.stat-icon svg {
    width: 28px;
    height: 28px;
}

.stat-icon.streak {
    background: #FEF3E2;
    color: #D4896A;
}

.stat-icon.completion {
    background: #E8F5E9;
    color: var(--color-success);
}

.stat-icon.habits {
    background: #E3F2FD;
    color: #2E5090;
}

.stat-icon.total {
    background: #F3E5F5;
    color: #7D3C50;
}

.stat-content {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-text);
    line-height: 1;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-top: var(--space-xs);
}

/* Sections */
.section {
    margin-bottom: var(--space-2xl);
}

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

.section-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text);
}

.date-badge {
    background: var(--color-surface);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
}

/* Habits List */
.habits-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.habit-item {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--space-lg) var(--space-xl);
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    cursor: pointer;
}

.habit-item:hover {
    box-shadow: var(--shadow-md);
}

.habit-checkbox {
    width: 28px;
    height: 28px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.habit-checkbox:hover {
    border-color: var(--color-primary);
}

.habit-checkbox.checked {
    background: var(--color-success);
    border-color: var(--color-success);
}

.habit-checkbox.checked svg {
    width: 16px;
    height: 16px;
    color: white;
}

.habit-info {
    flex: 1;
}

.habit-name {
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-xs);
}

.habit-meta {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.habit-category {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.category-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.habit-streak {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.habit-streak svg {
    width: 14px;
    height: 14px;
    color: var(--color-primary);
}

.habit-actions {
    display: flex;
    gap: var(--space-sm);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.habit-item:hover .habit-actions {
    opacity: 1;
}

/* Charts Grid */
.charts-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
}

.chart-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    box-shadow: var(--shadow-sm);
}

.chart-title {
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-lg);
}

.chart-container {
    height: 280px;
    position: relative;
}

.chart-container.large {
    height: 350px;
}

/* Habits Grid (All Habits View) */
.habits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--space-lg);
}

.habit-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    border-left: 4px solid var(--color-primary);
}

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

.habit-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-md);
}

.habit-card-title {
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text);
}

.habit-card-category {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    background: var(--color-surface-alt);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
}

.habit-card-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

.habit-card-stat {
    text-align: center;
}

.habit-card-stat-value {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
}

.habit-card-stat-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Filter Tabs */
.filter-tabs {
    display: flex;
    gap: var(--space-xs);
    background: var(--color-surface-alt);
    padding: var(--space-xs);
    border-radius: var(--radius-md);
}

.filter-tab {
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-muted);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.filter-tab.active {
    background: var(--color-surface);
    color: var(--color-text);
    box-shadow: var(--shadow-sm);
}

/* Analytics Grid */
.analytics-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--space-lg);
    margin-bottom: var(--space-2xl);
}

.analytics-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    box-shadow: var(--shadow-sm);
}

.analytics-card.large {
    grid-row: span 2;
}

/* Insights */
.insights-section {
    margin-top: var(--space-2xl);
}

.insights-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

.insight-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    box-shadow: var(--shadow-sm);
}

.insight-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.insight-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

.insight-icon svg {
    width: 24px;
    height: 24px;
}

.insight-icon.positive {
    background: #E8F5E9;
    color: var(--color-success);
}

.insight-icon.warning {
    background: #FFF3E0;
    color: var(--color-warning);
}

.insight-icon.info {
    background: #E3F2FD;
    color: #2E5090;
}

.insight-title {
    font-weight: 600;
    color: var(--color-text);
}

.insight-text {
    color: var(--color-text-muted);
    font-size: 0.9375rem;
    line-height: 1.6;
}

/* Calendar */
.calendar-container {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    box-shadow: var(--shadow-sm);
}

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

.calendar-month {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text);
}

.calendar-nav {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.calendar-nav:hover {
    background: var(--color-surface-alt);
}

.calendar-nav svg {
    width: 20px;
    height: 20px;
    color: var(--color-text);
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: var(--space-sm);
}

.calendar-day-header {
    text-align: center;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    padding: var(--space-md) 0;
}

.calendar-day {
    aspect-ratio: 1;
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    background: var(--color-surface-alt);
}

.calendar-day:hover {
    background: var(--color-border);
}

.calendar-day.other-month {
    color: var(--color-text-light);
    background: transparent;
}

.calendar-day.today {
    background: var(--color-primary);
    color: white;
}

.calendar-day-number {
    font-weight: 600;
    font-size: 0.9375rem;
}

.calendar-day-dots {
    display: flex;
    gap: 2px;
    margin-top: 4px;
}

.calendar-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
}

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(61, 43, 31, 0.5);
    backdrop-filter: blur(4px);
}

.modal-content {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 480px;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    z-index: 1;
    box-shadow: var(--shadow-xl);
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    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(--space-xl) var(--space-xl) 0;
}

.modal-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text);
}

.modal-close {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    border: none;
    background: var(--color-surface-alt);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--color-border);
}

.modal-close svg {
    width: 20px;
    height: 20px;
    color: var(--color-text);
}

.modal-form {
    padding: var(--space-xl);
}

/* Form Elements */
.form-group {
    margin-bottom: var(--space-lg);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
}

.form-label {
    display: block;
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: var(--space-sm);
    font-size: 0.9375rem;
}

.form-input,
.form-select {
    width: 100%;
    padding: var(--space-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: 0.9375rem;
    color: var(--color-text);
    background: var(--color-surface);
    transition: all var(--transition-fast);
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(181, 86, 62, 0.1);
}

.form-input::placeholder {
    color: var(--color-text-light);
}

.color-picker {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.color-option {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 3px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.color-option:hover {
    transform: scale(1.1);
}

.color-option.active {
    border-color: var(--color-text);
    transform: scale(1.1);
}

.form-actions {
    display: flex;
    gap: var(--space-md);
    margin-top: var(--space-xl);
}

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

/* View Switching */
.view {
    display: none;
}

.view.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

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

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--space-3xl) var(--space-xl);
    color: var(--color-text-muted);
}

.empty-state-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--space-lg);
    background: var(--color-surface-alt);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.empty-state-icon svg {
    width: 40px;
    height: 40px;
    color: var(--color-text-light);
}

.empty-state-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    color: var(--color-text);
    margin-bottom: var(--space-sm);
}

.empty-state-text {
    max-width: 400px;
    margin: 0 auto;
}

/* Responsive */
@media (max-width: 1200px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .analytics-grid {
        grid-template-columns: 1fr;
    }
    
    .analytics-card.large {
        grid-row: auto;
    }
    
    .insights-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
        border-right: none;
        border-bottom: 1px solid var(--color-border);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .app-container {
        flex-direction: column;
    }
    
    .nav-menu {
        flex-direction: row;
        overflow-x: auto;
        padding: var(--space-sm);
    }
    
    .nav-item span {
        display: none;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .charts-grid {
        grid-template-columns: 1fr;
    }
    
    .header {
        flex-direction: column;
        gap: var(--space-md);
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-surface-alt);
}

::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-light);
}