/* ===== ROOT VARIABLES ===== */
:root {
    /* Modern Color Palette */
    --primary: #FF6B6B;
    --primary-light: #FF8E8E;
    --primary-dark: #E85555;
    --accent: #FFD93D;
    --accent-glow: #FFE66D;
    --secondary: #6BCF7F;
    --danger: #EF4444;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #FF6B6B 0%, #FFD93D 50%, #FF8E53 100%);
    --gradient-soft: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-success: linear-gradient(135deg, #6BCF7F 0%, #4ECCA3 100%);
    
    /* Backgrounds */
    --bg-primary: #0A0E27;
    --bg-secondary: #1A1F3A;
    --bg-tertiary: #252A47;
    --bg-card: rgba(255, 255, 255, 0.05);
    --bg-hover: rgba(255, 255, 255, 0.08);
    
    /* Text Colors */
    --text-primary: #FFFFFF;
    --text-secondary: #B8BFD8;
    --text-muted: #7C82A0;
    
    /* Borders & Shadows */
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.15);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 30px rgba(255, 107, 107, 0.4);
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== RESET & BASE ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

@keyframes scaleIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

@keyframes glow {
    0%, 100% { box-shadow: 0 0 20px rgba(255, 107, 107, 0.3); }
    50% { box-shadow: 0 0 40px rgba(255, 107, 107, 0.6); }
}

@keyframes shimmer {
    0% { background-position: -1000px 0; }
    100% { background-position: 1000px 0; }
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ===== SCREEN MANAGEMENT ===== */
.screen {
    min-height: 100vh;
    width: 100%;
    display: none;
    overflow-x: hidden;
}

.screen.active {
    display: block;
}

/* ===== WELCOME SCREEN ===== */
#welcomeScreen {
    background: linear-gradient(135deg, #0A0E27 0%, #1A1F3A 100%);
    position: relative;
    overflow: hidden;
}

#welcomeScreen::before {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(255, 107, 107, 0.15) 0%, transparent 70%);
    top: -200px;
    right: -200px;
    animation: pulse 4s ease-in-out infinite;
}

.welcome-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    position: relative;
    z-index: 1;
}

.welcome-content {
    text-align: center;
    animation: fadeIn 0.8s ease-out;
}

.app-logo {
    margin-bottom: var(--spacing-xl);
    animation: pulse 3s ease-in-out infinite;
}

.logo-svg {
    width: 150px;
    height: 150px;
    filter: drop-shadow(0 8px 24px rgba(255, 107, 107, 0.4));
}

.welcome-title {
    font-size: 4rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
    font-family: 'Space Mono', monospace;
}

.welcome-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2xl);
}

.welcome-actions {
    margin-bottom: var(--spacing-2xl);
}

.welcome-features {
    display: flex;
    gap: var(--spacing-xl);
    justify-content: center;
    flex-wrap: wrap;
}

.feature-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
    transition: var(--transition-base);
}

.feature-item:hover {
    transform: translateY(-5px);
    background: var(--bg-hover);
    border-color: var(--primary);
}

.feature-icon {
    font-size: 2rem;
}

/* ===== AUTH SCREENS ===== */
.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    background: var(--bg-primary);
    position: relative;
}

.auth-container::before {
    content: '';
    position: absolute;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(255, 107, 107, 0.1) 0%, transparent 70%);
    top: -150px;
    left: -150px;
    animation: pulse 5s ease-in-out infinite;
}

.auth-card {
    width: 100%;
    max-width: 450px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-lg);
    position: relative;
    z-index: 1;
    animation: scaleIn 0.4s ease-out;
}

.back-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-base);
    margin-bottom: var(--spacing-lg);
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.back-btn:hover {
    background: var(--bg-hover);
    border-color: var(--primary);
    color: var(--text-primary);
}

.auth-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.auth-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

.logo-svg-small {
    width: 60px;
    height: 60px;
}

.auth-header h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.auth-header p {
    color: var(--text-secondary);
}

.message-container {
    margin-bottom: var(--spacing-lg);
}

.success-message,
.error-message {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    display: none;
    animation: slideUp 0.3s ease-out;
}

.success-message {
    background: rgba(107, 207, 127, 0.15);
    border: 1px solid var(--secondary);
    color: var(--secondary);
}

.error-message {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid var(--danger);
    color: var(--danger);
}

.success-message.show,
.error-message.show {
    display: block;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.input-group label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.input-group input,
.input-group textarea {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition-base);
}

.input-group input:focus,
.input-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--bg-hover);
    box-shadow: 0 0 0 3px rgba(255, 107, 107, 0.1);
}

.input-group textarea {
    resize: vertical;
    min-height: 80px;
}

.password-wrapper {
    position: relative;
}

.password-toggle {
    position: absolute;
    right: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    padding: var(--spacing-xs);
    color: var(--text-muted);
    transition: var(--transition-base);
}

.password-toggle:hover {
    color: var(--text-primary);
}

.divider {
    position: relative;
    text-align: center;
    margin: var(--spacing-md) 0;
}

.divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--border-color);
}

.divider span {
    position: relative;
    padding: 0 var(--spacing-md);
    background: var(--bg-secondary);
    color: var(--text-muted);
    font-size: 0.85rem;
}

.auth-switch {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.link-btn {
    background: none;
    border: none;
    color: var(--primary);
    text-decoration: underline;
    cursor: pointer;
    font-size: inherit;
    padding: 0;
    transition: var(--transition-base);
}

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

/* ===== BUTTONS ===== */
.btn {
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-base);
    font-family: inherit;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #fff;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-primary-glow {
    background: var(--gradient-primary);
    color: #fff;
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: 1.1rem;
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-glow);
    animation: glow 2s ease-in-out infinite;
}

.btn-primary-glow:hover {
    transform: scale(1.05);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--bg-hover);
    border-color: var(--primary);
}

.btn-google {
    background: white;
    color: #333;
    border: 1px solid #ddd;
}

.btn-google:hover {
    background: #f8f8f8;
    box-shadow: var(--shadow-md);
}

.btn-link {
    background: transparent;
    color: var(--text-secondary);
    text-decoration: underline;
    padding: var(--spacing-sm);
}

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

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

.btn-danger:hover:not(:disabled) {
    background: #DC2626;
    box-shadow: 0 0 20px rgba(239, 68, 68, 0.4);
}

.full-width {
    width: 100%;
}

/* ===== NAVBAR ===== */
.navbar {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(20px);
}

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

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.nav-logo {
    width: 40px;
    height: 40px;
}

.brand-text {
    font-size: 1.5rem;
    font-weight: 800;
    font-family: 'Space Mono', monospace;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-actions {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.btn-add {
    background: var(--gradient-primary);
    color: white;
    border: none;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    box-shadow: var(--shadow-md);
}

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

.add-icon {
    font-size: 1.5rem;
    line-height: 1;
}

.btn-icon {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 1.2rem;
    transition: var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-icon:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--primary);
}

.btn-profile {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    overflow: hidden;
    position: relative;
    transition: var(--transition-base);
}

.btn-profile:hover {
    border-color: var(--primary);
    transform: scale(1.05);
}

.profile-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: none;
}

.profile-initials {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.9rem;
    background: var(--gradient-primary);
    color: white;
}

/* ===== MAIN CONTENT ===== */
.main-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
}

/* Stats Overview */
.stats-overview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
    animation: fadeIn 0.6s ease-out;
}

.stat-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    transition: var(--transition-base);
}

.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary);
}

.stat-icon {
    font-size: 2.5rem;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border-radius: var(--radius-md);
}

.stat-info {
    flex: 1;
}

.stat-value {
    font-size: 2rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: var(--spacing-xs);
}

/* Content Section */
.content-section {
    margin-bottom: var(--spacing-2xl);
}

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

.section-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.view-toggle {
    display: flex;
    gap: var(--spacing-sm);
    background: var(--bg-card);
    padding: var(--spacing-xs);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.view-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition-base);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

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

.view-btn:hover:not(.active) {
    background: var(--bg-hover);
    color: var(--text-primary);
}

/* Predefined Streaks */
.predefined-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: var(--spacing-md);
}

.predefined-card {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    cursor: pointer;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.predefined-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-primary);
    opacity: 0;
    transition: var(--transition-base);
}

.predefined-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
    box-shadow: var(--shadow-glow);
}

.predefined-card:hover::before {
    opacity: 0.1;
}

.predefined-card .icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
    position: relative;
    z-index: 1;
}

.predefined-card .name {
    font-weight: 600;
    color: var(--text-primary);
    position: relative;
    z-index: 1;
}

/* Streaks Grid */
.streaks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-lg);
    animation: fadeIn 0.6s ease-out;
}

.streak-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    cursor: pointer;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.streak-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
}

.streak-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

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

.streak-info {
    flex: 1;
}

.streak-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.streak-name {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.streak-description {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.streak-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.streak-stat {
    text-align: center;
}

.streak-stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.streak-stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: var(--spacing-xs);
}

.streak-progress {
    margin-bottom: var(--spacing-md);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-card);
    border-radius: var(--radius-full);
    overflow: hidden;
    position: relative;
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: shimmer 2s infinite;
}

.progress-text {
    text-align: center;
    margin-top: var(--spacing-sm);
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 600;
}

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

.btn-complete {
    flex: 1;
    background: var(--gradient-success);
    color: white;
    border: none;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-base);
}

.btn-complete:hover:not(:disabled) {
    transform: scale(1.02);
    box-shadow: 0 0 20px rgba(107, 207, 127, 0.4);
}

.btn-complete.completed {
    background: var(--bg-card);
    color: var(--secondary);
    border: 1px solid var(--secondary);
}

/* Calendar View */
.calendar-view {
    animation: fadeIn 0.4s ease-out;
}

.calendar-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.btn-month {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 1.2rem;
    transition: var(--transition-base);
}

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

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

.calendar-header {
    text-align: center;
    padding: var(--spacing-sm);
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.85rem;
    text-transform: uppercase;
}

.calendar-day {
    aspect-ratio: 1;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    cursor: pointer;
    transition: var(--transition-base);
    position: relative;
}

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

.calendar-day.other-month {
    opacity: 0.3;
}

.calendar-day.today {
    border: 2px solid var(--primary);
    box-shadow: 0 0 15px rgba(255, 107, 107, 0.3);
}

.day-number {
    font-weight: 600;
    font-size: 0.9rem;
}

.day-dots {
    display: flex;
    gap: 2px;
    flex-wrap: wrap;
    max-width: 100%;
}

.day-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--primary);
}

.calendar-legend {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.legend-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.legend-dot.completed {
    background: var(--secondary);
}

.legend-dot.partial {
    background: var(--accent);
}

.legend-dot.empty {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    display: none;
}

.empty-state.show {
    display: block;
}

.empty-icon {
    font-size: 5rem;
    opacity: 0.3;
    margin-bottom: var(--spacing-lg);
}

.empty-state h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.empty-state p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.modal.active {
    display: flex;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    animation: fadeIn 0.2s ease-out;
}

.modal-content {
    position: relative;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    animation: scaleIn 0.3s ease-out;
    z-index: 1;
}

.modal-large {
    max-width: 700px;
}

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

.modal-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
}

.modal-close {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.5rem;
    transition: var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.modal-body {
    padding: var(--spacing-xl);
}

.modal-footer {
    padding: var(--spacing-xl);
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
}

/* Icon Picker */
.icon-picker {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.icon-picker input {
    text-align: center;
    font-size: 2rem;
    cursor: pointer;
}

.icon-options {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(50px, 1fr));
    gap: var(--spacing-sm);
}

.icon-option {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-base);
}

.icon-option:hover,
.icon-option.selected {
    background: var(--bg-hover);
    border-color: var(--primary);
    transform: scale(1.1);
}

/* Detail Progress Ring */
.detail-progress-ring {
    display: flex;
    justify-content: center;
    margin-bottom: var(--spacing-xl);
}

.progress-ring {
    transform: rotate(-90deg);
}

.progress-ring-bg {
    stroke: var(--bg-card);
}

.progress-ring-fill {
    stroke-dasharray: 534.07;
    stroke-dashoffset: 534.07;
    transition: stroke-dashoffset 1s cubic-bezier(0.4, 0, 0.2, 1);
}

.detail-stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.detail-stat {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
}

.detail-stat-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.detail-stat-value {
    font-size: 2rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.detail-stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
}

.detail-description {
    color: var(--text-secondary);
    line-height: 1.8;
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--bg-card);
    border-radius: var(--radius-lg);
}

/* Settings */
.settings-section {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
}

.settings-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.settings-section h4 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.profile-settings {
    display: flex;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

.profile-photo-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.current-profile-photo {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 3px solid var(--border-color);
    overflow: hidden;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.current-profile-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: none;
}

.current-profile-photo span {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.profile-photo-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.profile-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.info-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.info-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.info-value {
    font-weight: 600;
    color: var(--text-primary);
}

.settings-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
    gap: var(--spacing-lg);
}

.setting-info {
    flex: 1;
}

.setting-info label {
    font-weight: 600;
    display: block;
    margin-bottom: var(--spacing-xs);
}

.setting-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin: 0;
}

.setting-info input[type="time"] {
    margin-top: var(--spacing-sm);
}

.toggle-switch {
    position: relative;
    width: 56px;
    height: 30px;
    flex-shrink: 0;
}

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

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    transition: var(--transition-base);
}

.toggle-slider::before {
    position: absolute;
    content: "";
    height: 22px;
    width: 22px;
    left: 3px;
    bottom: 3px;
    background: white;
    border-radius: 50%;
    transition: var(--transition-base);
}

.toggle-switch input:checked + .toggle-slider {
    background: var(--gradient-primary);
    border-color: transparent;
}

.toggle-switch input:checked + .toggle-slider::before {
    transform: translateX(26px);
}

.about-info {
    color: var(--text-secondary);
    line-height: 1.8;
}

.about-info p {
    margin-bottom: var(--spacing-sm);
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg) var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    z-index: 10000;
    opacity: 0;
    transition: var(--transition-base);
    max-width: 90%;
    text-align: center;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast.success {
    border-color: var(--secondary);
    background: rgba(107, 207, 127, 0.15);
}

.toast.error {
    border-color: var(--danger);
    background: rgba(239, 68, 68, 0.15);
}

/* ===== RESPONSIVE DESIGN ===== */

/* Tablet */
@media (max-width: 1024px) {
    .stats-overview {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .streaks-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
    
    .detail-stats-grid {
        grid-template-columns: 1fr;
    }
}

/* Mobile */
@media (max-width: 768px) {
    :root {
        --spacing-xl: 24px;
        --spacing-2xl: 32px;
    }
    
    .welcome-title {
        font-size: 3rem;
    }
    
    .feature-item {
        padding: var(--spacing-md);
    }
    
    .brand-text {
        display: none;
    }
    
    .add-text {
        display: none;
    }
    
    .nav-actions {
        gap: var(--spacing-sm);
    }
    
    .stats-overview {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .stat-card {
        padding: var(--spacing-md);
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .predefined-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    }
    
    .streaks-grid {
        grid-template-columns: 1fr;
    }
    
    .calendar-grid {
        gap: var(--spacing-xs);
    }
    
    .calendar-day {
        padding: var(--spacing-xs);
    }
    
    .day-number {
        font-size: 0.75rem;
    }
    
    .day-dot {
        width: 4px;
        height: 4px;
    }
    
    .modal-content {
        max-width: 100%;
        margin: 0;
        border-radius: var(--radius-lg);
    }
    
    .profile-settings {
        flex-direction: column;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .welcome-title {
        font-size: 2.5rem;
    }
    
    .welcome-subtitle {
        font-size: 1rem;
    }
    
    .logo-svg {
        width: 100px;
        height: 100px;
    }
    
    .auth-card {
        padding: var(--spacing-lg);
    }
    
    .main-content {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .section-header h3 {
        font-size: 1.25rem;
    }
    
    .streak-stats {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .modal-header,
    .modal-body,
    .modal-footer {
        padding: var(--spacing-lg);
    }
    
    .calendar-legend {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}

/* Disable animations if user prefers */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* No animations class */
body.no-animations *,
body.no-animations *::before,
body.no-animations *::after {
    animation: none !important;
    transition: none !important;
}

/* ===== UTILITY CLASSES ===== */
.hidden {
    display: none !important;
}

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s linear infinite;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}