/* Import Clean Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@100;200;300;400;500;600;700;800;900&family=JetBrains+Mono:wght@100;200;300;400;500;600;700;800&family=Poppins:wght@100;200;300;400;500;600;700;800;900&display=swap');

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

/* Clean Light Theme Color System */
:root {
    /* Primary Palette - Clean Blues and Whites */
    --white: #ffffff;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* Blue Accent System */
    --blue-50: #eff6ff;
    --blue-100: #dbeafe;
    --blue-200: #bfdbfe;
    --blue-300: #93c5fd;
    --blue-400: #60a5fa;
    --blue-500: #3b82f6;
    --blue-600: #2563eb;
    --blue-700: #1d4ed8;
    --blue-800: #1e40af;
    --blue-900: #1e3a8a;
    
    /* Semantic Colors */
    --success: #22c55e;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #06b6d4;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;
    --font-display: 'Poppins', 'Inter', sans-serif;
    
    /* Font Sizes */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    --text-6xl: 3.75rem;
    
    /* Spacing System */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    --space-32: 8rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-3xl: 2rem;
    --radius-full: 9999px;
    
    /* Shadows - Clean and Subtle */
    --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    --shadow-blue: 0 4px 14px 0 rgb(59 130 246 / 0.2);
    --shadow-blue-lg: 0 10px 25px -3px rgb(59 130 246 / 0.3);
    
    /* Transitions */
    --transition-fast: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 600ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 600ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
    
    /* Z-Index Scale */
    --z-background: -1;
    --z-base: 0;
    --z-elevated: 10;
    --z-floating: 50;
    --z-modal: 100;
    --z-overlay: 200;
    --z-maximum: 9999;
}

/* Dark Theme Variables */
[data-theme="dark"] {
    /* Dark Background System */
    --white: #1C1C1C;
    --gray-50: #252525;
    --gray-100: #2E2E2E;
    --gray-200: #383838;
    --gray-300: #424242;
    --gray-400: #565656;
    --gray-500: #7A7A7A;
    --gray-600: #A8A8A8;
    --gray-700: #D1D1D1;
    --gray-800: #E8E8E8;
    --gray-900: #F8F8F8;
    
    /* Enhanced Dark Blue System */
    --blue-50: #1E293B;
    --blue-100: #334155;
    --blue-200: #475569;
    --blue-300: #64748B;
    --blue-400: #94A3B8;
    --blue-500: #3B82F6;
    --blue-600: #60A5FA;
    --blue-700: #93C5FD;
    --blue-800: #BFDBFE;
    --blue-900: #DBEAFE;
    
    /* Enhanced Dark Semantic Colors */
    --success: #10B981;
    --warning: #F59E0B;
    --error: #EF4444;
    --info: #06B6D4;
    
    /* Enhanced Dark Shadows */
    --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.8);
    --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.8), 0 1px 2px -1px rgb(0 0 0 / 0.8);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.8), 0 2px 4px -2px rgb(0 0 0 / 0.8);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.8), 0 4px 6px -4px rgb(0 0 0 / 0.8);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.8), 0 8px 10px -6px rgb(0 0 0 / 0.8);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.9);
    --shadow-blue: 0 4px 14px 0 rgb(59 130 246 / 0.4);
    --shadow-blue-lg: 0 10px 25px -3px rgb(59 130 246 / 0.5);
}

/* Dark theme body background (solid base to avoid reflow flicker) */
[data-theme="dark"] body {
    background-color: #1C1C1C;
    background-image:
        radial-gradient(circle at 20% 20%, rgba(59, 130, 246, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(147, 197, 253, 0.03) 0%, transparent 50%),
        linear-gradient(135deg, #1C1C1C 0%, #252525 100%);
    background-attachment: scroll;
}

/* Clean Base Styles */
html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    -ms-text-size-adjust: 100%;
    text-size-adjust: 100%;
    overflow-x: hidden;
    scrollbar-gutter: stable;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

html::-webkit-scrollbar {
    width: 0px;
    display: none;
}

body {
    font-family: var(--font-family);
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--gray-800);
    background: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    -webkit-overflow-scrolling: touch;
    overflow-x: hidden;
    min-height: 100vh;
    position: relative;
    transition: background-color var(--transition-normal), color var(--transition-normal);
    scrollbar-width: none;
    scrollbar-color: transparent transparent;
    -ms-overflow-style: none;
}

/* Global scrollbar removal */
* {
    scrollbar-width: none;
    -ms-overflow-style: none;
}

*::-webkit-scrollbar {
    width: 0px;
    display: none;
}

/* Clean Background with Subtle Gradients */
body {
    background-color: var(--white);
    background-image:
        radial-gradient(circle at 20% 20%, rgba(59, 130, 246, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(147, 197, 253, 0.02) 0%, transparent 50%),
        linear-gradient(135deg, var(--white) 0%, var(--gray-50) 100%);
    background-attachment: scroll;
}

/* Prevent dark-mode scroll glitches */
[data-theme="dark"] html, [data-theme="dark"] body {
    background-color: #1C1C1C;
    overscroll-behavior-y: none;
}

/* Normalize surfaces in dark mode to avoid sudden white flashes */
[data-theme="dark"] .card,
[data-theme="dark"] .section,
[data-theme="dark"] .calendar-grid,
[data-theme="dark"] .ai-chat-container,
[data-theme="dark"] .tasks-container,
[data-theme="dark"] .today-schedule,
[data-theme="dark"] .analytics-card,
[data-theme="dark"] .settings-card,
[data-theme="dark"] .modal-content,
[data-theme="dark"] .chat-input-container,
[data-theme="dark"] .message-content,
[data-theme="dark"] .calendar-header,
[data-theme="dark"] .tasks-filters,
[data-theme="dark"] .notification,
[data-theme="dark"] .loading-screen {
    background-color: var(--surface-1) !important;
    border-color: var(--border-soft) !important;
}

/* Headers (global) */
[data-theme="dark"] .main-header,
[data-theme="dark"] .navbar {
    background: var(--surface-0) !important;
    border-color: var(--border-soft) !important;
    box-shadow: var(--shadow-lg);
}

/* Ensure sticky headers remain dark when scrolled */
[data-theme="dark"] .main-header.sticky,
[data-theme="dark"] .navbar.scrolled {
    background: var(--surface-0) !important;
    border-color: var(--border-soft) !important;
}

[data-theme="dark"] .main-header h1,
[data-theme="dark"] .main-header p,
[data-theme="dark"] .navbar .nav-link {
    color: var(--gray-800) !important;
}

[data-theme="dark"] .navbar .nav-link:hover {
    color: var(--blue-400) !important;
}

/* Buttons (global) */
[data-theme="dark"] .btn-primary {
    background: linear-gradient(135deg, var(--blue-500), var(--blue-600));
    color: #ffffff;
    border: 1px solid var(--blue-500);
    box-shadow: var(--shadow-blue);
}

[data-theme="dark"] .btn-primary:hover {
    background: linear-gradient(135deg, var(--blue-600), var(--blue-700));
    box-shadow: var(--shadow-blue-lg);
}

[data-theme="dark"] .btn-danger {
    background: linear-gradient(135deg, var(--error), #dc2626);
    color: #ffffff;
    border: 1px solid var(--error);
}

[data-theme="dark"] .btn-icon {
    background: var(--surface-2);
    border: 1px solid var(--border-strong);
    color: var(--gray-800);
}

[data-theme="dark"] .btn:disabled {
    opacity: 0.6;
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    position: relative;
    z-index: var(--z-base);
}

/* Beast Mode: Cosmic Particles System */
.cosmic-particles {
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    width: 100% !important;
    height: 100% !important;
    z-index: -10 !important;
    pointer-events: none !important;
    overflow: hidden !important;
    background: transparent !important;
}

.cosmic-particles .particle {
    position: absolute;
    background: rgba(59, 130, 246, 0.08);
    border-radius: 50%;
    opacity: 0.4;
    animation: cosmicParticleFloat 25s infinite linear;
    pointer-events: none;
    will-change: transform;
}

[data-theme="dark"] .cosmic-particles .particle {
    background: rgba(59, 130, 246, 0.12);
    opacity: 0.6;
}

@keyframes cosmicParticleFloat {
    0% {
        transform: translateY(100vh) rotate(0deg) scale(0);
        opacity: 0;
    }
    5% {
        opacity: 0.4;
        transform: translateY(95vh) rotate(18deg) scale(1);
    }
    95% {
        opacity: 0.4;
        transform: translateY(5vh) rotate(342deg) scale(1);
    }
    100% {
        transform: translateY(-5vh) rotate(360deg) scale(0);
        opacity: 0;
    }
}

/* Clean Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--gray-900);
    font-family: var(--font-display);
    margin-bottom: var(--space-4);
    letter-spacing: -0.01em;
}

/* Ensure dark headings are visible */
[data-theme="dark"] h1,
[data-theme="dark"] h2,
[data-theme="dark"] h3,
[data-theme="dark"] h4,
[data-theme="dark"] h5,
[data-theme="dark"] h6 {
    color: #EDEDED;
}

h1 { 
    font-size: clamp(2.5rem, 5vw, 4rem);
    color: var(--gray-900);
    font-weight: 900;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] h1 {
    color: #FFFFFF !important;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

h2 { 
    font-size: clamp(1.875rem, 4vw, 2.25rem);
    color: var(--gray-800);
    font-weight: 800;
}

h3 { 
    font-size: var(--text-xl);
    color: var(--blue-600);
    font-weight: 700;
}

p {
    margin-bottom: var(--space-4);
    color: var(--gray-600);
    line-height: 1.7;
}

/* Ensure body text is readable in dark mode */
[data-theme="dark"] p,
[data-theme="dark"] li,
[data-theme="dark"] span,
[data-theme="dark"] label,
[data-theme="dark"] .text-muted {
    color: var(--gray-700);
}

/* Clean Links */
a {
    color: var(--blue-600);
    text-decoration: none;
    transition: all var(--transition-normal);
    position: relative;
}

[data-theme="dark"] a {
    color: var(--blue-400);
}

a::before {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--blue-500), var(--blue-600));
    transition: width var(--transition-normal);
}

a:hover::before {
    width: 100%;
}

a:hover {
    color: var(--blue-700);
}

/* Beautiful Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-size: var(--text-base);
    font-weight: 600;
    border-radius: var(--radius-lg);
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    user-select: none;
    font-family: var(--font-family);
    position: relative;
    overflow: hidden;
    text-transform: none;
    letter-spacing: 0;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left var(--transition-slow);
}

.btn:hover::before {
    left: 100%;
}

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

.btn-sm {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
}

.btn-large {
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-lg);
    border-radius: var(--radius-xl);
}

.btn-full {
    width: 100%;
}

.btn-icon {
    padding: var(--space-3);
    width: 48px;
    height: 48px;
    border-radius: 50%;
}

.btn-primary {
    background: linear-gradient(135deg, var(--blue-500), var(--blue-600));
    color: white;
    box-shadow: var(--shadow-blue);
    border: 1px solid var(--blue-500);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-blue-lg);
    background: linear-gradient(135deg, var(--blue-600), var(--blue-700));
}

.btn-secondary {
    background: var(--white);
    color: var(--blue-600);
    border: 1px solid var(--blue-200);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background: var(--blue-50);
    border-color: var(--blue-300);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    color: var(--blue-600);
    border: 2px solid var(--blue-300);
}

.btn-outline:hover {
    background: var(--blue-50);
    border-color: var(--blue-500);
    transform: translateY(-1px);
}

.btn-danger {
    background: linear-gradient(135deg, var(--error), #dc2626);
    color: white;
    box-shadow: 0 4px 14px 0 rgb(239 68 68 / 0.15);
}

.btn-danger:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px -3px rgb(239 68 68 / 0.2);
}

/* Clean Forms */
.form {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    position: relative;
}

.input-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
}

label {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--gray-700);
    text-transform: none;
    letter-spacing: 0;
}

input, textarea, select {
    padding: var(--space-3) var(--space-4);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-lg);
    font-size: var(--text-base);
    transition: all var(--transition-normal);
    background: var(--white);
    color: var(--gray-800);
    font-family: var(--font-family);
    box-shadow: var(--shadow-xs);
}

input::placeholder,
textarea::placeholder {
    color: var(--gray-400);
    font-style: normal;
}

input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--blue-500);
    box-shadow: 
        0 0 0 3px rgb(59 130 246 / 0.1),
        var(--shadow-md);
    transform: translateY(-1px);
    background: var(--white);
}

textarea {
    resize: vertical;
    min-height: 120px;
}

/* Clean Checkbox and Toggle */
.checkbox {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    cursor: pointer;
    font-size: var(--text-sm);
    color: var(--gray-700);
    padding: var(--space-2);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

.checkbox:hover {
    background: var(--gray-50);
}

.checkbox input[type="checkbox"] {
    display: none;
}

.checkmark {
    width: 20px;
    height: 20px;
    background: var(--white);
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-xs);
}

.checkmark::after {
    content: '✓';
    font-size: 12px;
    color: white;
    opacity: 0;
    transition: all var(--transition-normal);
    font-weight: 700;
}

.checkbox input[type="checkbox"]:checked + .checkmark {
    background: var(--blue-500);
    border-color: var(--blue-500);
    box-shadow: var(--shadow-blue);
}

.checkbox input[type="checkbox"]:checked + .checkmark::after {
    opacity: 1;
}

.toggle {
    position: relative;
    display: inline-flex;
    align-items: center;
    cursor: pointer;
}

.toggle input[type="checkbox"] {
    display: none;
}

.toggle-slider {
    width: 48px;
    height: 24px;
    background: var(--gray-200);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-full);
    position: relative;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-xs);
}

.toggle-slider::before {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    background: var(--white);
    border-radius: 50%;
    top: 2px;
    left: 2px;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.toggle input[type="checkbox"]:checked + .toggle-slider {
    background: var(--blue-500);
    border-color: var(--blue-500);
    box-shadow: var(--shadow-blue);
}

.toggle input[type="checkbox"]:checked + .toggle-slider::before {
    transform: translateX(24px);
    background: var(--white);
}

/* Clean Cards */
.card {
    background: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
    overflow: hidden;
    position: relative;
    transition: all var(--transition-normal);
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--blue-500), var(--blue-600));
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--blue-200);
}

.card:hover::before {
    opacity: 1;
}

.card-header {
    padding: var(--space-6);
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    background: var(--gray-50);
}

.card-header h3 {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: var(--text-lg);
    margin: 0;
    font-family: var(--font-display);
    color: var(--gray-800);
}

.card-header i {
    color: var(--blue-500);
    font-size: var(--text-xl);
}

/* Clean Modal System */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    backdrop-filter: blur(8px);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.modal-overlay.show {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--white);
    border-radius: var(--radius-2xl);
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-2xl);
    border: 1px solid var(--gray-200);
    transform: scale(0.9) translateY(20px);
    transition: all var(--transition-bounce);
    position: relative;
}

.modal-overlay.show .modal-content {
    transform: scale(1) translateY(0);
}

.modal-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--blue-500), var(--blue-600));
    border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
}

.modal-header {
    padding: var(--space-6);
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--gray-50);
}

.modal-header h3 {
    margin: 0;
    color: var(--gray-800);
    font-family: var(--font-display);
}

.modal-close {
    background: var(--white);
    border: 1px solid var(--gray-300);
    font-size: var(--text-lg);
    color: var(--gray-500);
    cursor: pointer;
    padding: var(--space-2);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-xs);
}

.modal-close:hover {
    background: var(--gray-50);
    color: var(--gray-700);
    border-color: var(--gray-400);
    transform: scale(1.05);
}

.modal-body {
    padding: var(--space-6);
    line-height: 1.6;
}

.modal-actions {
    padding: var(--space-6);
    border-top: 1px solid var(--gray-200);
    display: flex;
    gap: var(--space-3);
    justify-content: flex-end;
    background: var(--gray-50);
}

/* Clean Notifications */
.notification {
    position: fixed;
    top: 20px;
    right: var(--space-6);
    background: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--gray-200);
    padding: var(--space-4) var(--space-6);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    z-index: var(--z-overlay);
    min-width: 350px;
    transform: translateX(400px);
    opacity: 0;
    transition: all var(--transition-bounce);
    position: relative;
    overflow: hidden;
}

.notification::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--blue-500);
}

.notification.show {
    transform: translateX(0);
    opacity: 1;
}

.notification-success::before {
    background: var(--success);
}

.notification-error::before {
    background: var(--error);
}

.notification-warning::before {
    background: var(--warning);
}

.notification-info::before {
    background: var(--info);
}

.notification-content {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    flex: 1;
    color: var(--gray-700);
}

.notification-success .notification-content i {
    color: var(--success);
}

.notification-error .notification-content i {
    color: var(--error);
}

.notification-warning .notification-content i {
    color: var(--warning);
}

.notification-info .notification-content i {
    color: var(--info);
}

.notification-close {
    background: none;
    border: none;
    color: var(--gray-400);
    cursor: pointer;
    padding: var(--space-1);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.notification-close:hover {
    background: var(--gray-100);
    color: var(--gray-600);
}

/* Clean Loading States */
.btn-loading {
    position: relative;
    color: transparent !important;
    pointer-events: none;
}

.btn-loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* Clean Error States */
.input-error {
    border-color: var(--error) !important;
    box-shadow: 
        0 0 0 3px rgb(239 68 68 / 0.1),
        var(--shadow-md) !important;
}

.error-message {
    color: var(--error);
    font-size: var(--text-sm);
    margin-top: var(--space-2);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.success-message {
    color: var(--success);
    font-size: var(--text-sm);
    margin-top: var(--space-2);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

/* Clean Utilities */
.hidden {
    display: none !important;
}

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

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.gradient-text {
    background: linear-gradient(135deg, var(--blue-600), var(--blue-800));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Clean Scrollbar */
::-webkit-scrollbar {
    width: 0px;
    background: transparent;
    display: none;
}

::-webkit-scrollbar-track {
    display: none;
}

::-webkit-scrollbar-thumb {
    display: none;
}

::-webkit-scrollbar-thumb:hover {
    display: none;
}

/* Dark theme scrollbar */
[data-theme="dark"] ::-webkit-scrollbar-track {
    display: none;
}

[data-theme="dark"] ::-webkit-scrollbar-thumb {
    display: none;
}

[data-theme="dark"] ::-webkit-scrollbar-thumb:hover {
    display: none;
}

/* Ensure consistent scrolling behavior in dark mode */
[data-theme="dark"] body {
    scrollbar-color: transparent transparent;
    scrollbar-width: none;
}

/* Prevent scrollbar flicker during theme transitions */
html.theme-switching * {
    scrollbar-width: none !important;
}

html.theme-switching *::-webkit-scrollbar {
    display: none !important;
    width: 0 !important;
}

/* Fix for modal and overlay scrollbars */
.modal-overlay,
.onboarding-overlay,
.loading-screen {
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.modal-overlay::-webkit-scrollbar,
.onboarding-overlay::-webkit-scrollbar,
.loading-screen::-webkit-scrollbar {
    display: none;
    width: 0;
}

/* Ensure modal content has proper scrolling */
.modal-content {
    scrollbar-width: none;
    scrollbar-color: transparent transparent;
}

.modal-content::-webkit-scrollbar {
    width: 0px;
    display: none;
}

.modal-content::-webkit-scrollbar-track {
    display: none;
}

.modal-content::-webkit-scrollbar-thumb {
    display: none;
}

html.theme-switching::-webkit-scrollbar,
html.theme-switching body::-webkit-scrollbar {
    display: none !important;
    width: 0 !important;
}

/* Clean Selection */
::selection {
    background: var(--blue-200);
    color: var(--blue-900);
}

::-moz-selection {
    background: var(--blue-200);
    color: var(--blue-900);
}

/* Clean Animations */
@keyframes spin {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}

@keyframes fadeInUp {
    0% {
        opacity: 0;
        transform: translateY(20px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeft {
    0% {
        opacity: 0;
        transform: translateX(-30px);
    }
    100% {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    0% {
        opacity: 0;
        transform: translateX(30px);
    }
    100% {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes scaleIn {
    0% {
        opacity: 0;
        transform: scale(0.9);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

/* Clean Reveal Animations */
.animate-in {
    animation: fadeInUp 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.animate-left {
    animation: slideInLeft 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.animate-right {
    animation: slideInRight 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.animate-scale {
    animation: scaleIn 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

/* Clean Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-maximum);
    opacity: 1;
    visibility: visible;
    transition: all var(--transition-slow);
}

.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
}

.loading-content {
    text-align: center;
    color: var(--gray-700);
}

.loading-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--gray-200);
    border-top: 4px solid var(--blue-500);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--space-6);
}

.loading-text {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--gray-600);
}

/* Responsive Design - Mobile First */
@media (max-width: 768px) {
    :root {
        --text-5xl: 2.5rem;
        --text-4xl: 2rem;
        --text-3xl: 1.75rem;
        --space-6: 1rem;
        --space-8: 1.5rem;
        --space-12: 2rem;
        --space-16: 2.5rem;
        --space-24: 3rem;
        --space-32: 4rem;
        --space-20: 3rem;
    }
    
    .container {
        padding: 0 var(--space-4);
    }
    
    .input-row {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }
    
    .btn-large {
        padding: var(--space-3) var(--space-6);
        font-size: var(--text-base);
        min-height: 48px;
    }
    
    .modal-content {
        width: 95%;
        margin: var(--space-4);
        max-height: 90vh;
        border-radius: var(--radius-xl);
    }
    
    .notification {
        width: calc(100% - 20px);
        min-width: auto;
        right: 10px;
        left: 10px;
        max-width: none;
        top: 10px;
        transform: translateY(-100px);
        padding: var(--space-3) var(--space-4);
        font-size: var(--text-sm);
    }
    
    .notification.show {
        transform: translateY(0);
    }
    
    /* Improve touch targets */
    .btn {
        min-height: 44px;
        padding: var(--space-3) var(--space-5);
        touch-action: manipulation;
        -webkit-tap-highlight-color: transparent;
    }
    
    .btn-sm {
        min-height: 40px;
        padding: var(--space-2) var(--space-4);
    }
    
    /* Better form inputs on mobile */
    input, textarea, select {
        font-size: 16px; /* Prevents zoom on iOS */
        min-height: 44px;
        padding: var(--space-3) var(--space-4);
        touch-action: manipulation;
        -webkit-appearance: none;
        border-radius: var(--radius-lg);
    }
    
    textarea {
        min-height: 100px;
        resize: vertical;
    }
    
    /* Improve checkbox and toggle touch targets */
    .checkbox {
        min-height: 44px;
        padding: var(--space-3);
        touch-action: manipulation;
    }
    
    .checkmark {
        width: 24px;
        height: 24px;
    }
    
    .toggle {
        min-height: 44px;
        touch-action: manipulation;
    }
    
    .toggle-slider {
        width: 52px;
        height: 28px;
    }
    
    .toggle-slider::before {
        width: 22px;
        height: 22px;
    }
    
    .toggle input[type="checkbox"]:checked + .toggle-slider::before {
        transform: translateX(26px);
    }
}

@media (max-width: 480px) {
    :root {
        --text-5xl: 2rem;
        --text-4xl: 1.75rem;
        --text-3xl: 1.5rem;
        --space-4: 0.75rem;
        --space-6: 1rem;
        --space-8: 1.25rem;
    }
    
    .container {
        padding: 0 var(--space-3);
    }
    
    .modal-content {
        width: 98%;
        margin: var(--space-2);
        border-radius: var(--radius-xl);
    }
    
    .modal-header {
        padding: var(--space-4);
    }
    
    .modal-body {
        padding: var(--space-4);
    }
    
    .modal-actions {
        padding: var(--space-4);
        flex-direction: column;
        gap: var(--space-3);
    }
    
    .modal-actions .btn {
        width: 100%;
        justify-content: center;
        min-height: 44px;
    }
    
    /* Ultra-mobile optimizations */
    .btn {
        min-height: 48px;
        font-size: var(--text-base);
        padding: var(--space-3) var(--space-5);
    }
    
    input, textarea, select {
        min-height: 48px;
        padding: var(--space-3);
        font-size: 16px;
    }
    
    .checkmark {
        width: 28px;
        height: 28px;
    }
    
    .toggle-slider {
        width: 56px;
        height: 32px;
    }
    
    .toggle-slider::before {
        width: 26px;
        height: 26px;
    }
    
    .toggle input[type="checkbox"]:checked + .toggle-slider::before {
        transform: translateX(28px);
    }
    
    .notification {
        width: calc(100% - 20px);
        right: 10px;
        left: 10px;
        top: 10px;
        min-width: auto;
        padding: var(--space-3) var(--space-4);
        transform: translateY(-100px);
    }
    
    .notification.show {
        transform: translateY(0);
    }
}

/* Performance Optimizations */
.card,
.btn,
.modal-content,
.notification {
    will-change: transform;
    backface-visibility: hidden;
    transform: translateZ(0);
}

/* Beast Mode: Prevent all secondary scrollbars */
* {
    scrollbar-gutter: stable;
}

*:not(.modal-content):not(.chat-messages):not(.onboarding-content) {
    overflow-x: hidden;
}

/* Ensure containers don't create horizontal overflow */
.container,
.nav-container,
.hero-content,
.features-grid,
.pricing-grid,
.footer-content {
    max-width: 100%;
    overflow-x: hidden;
}

/* Fix for any element that might cause horizontal scroll */
.hero,
.features,
.how-it-works,
.pricing,
.footer {
    overflow-x: hidden;
    width: 100%;
    max-width: 100vw;
}

/* Cross-browser compatibility */
input, textarea, select {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    -webkit-border-radius: var(--radius-lg);
    -moz-border-radius: var(--radius-lg);
    border-radius: var(--radius-lg);
}

input[type="checkbox"] {
    -webkit-appearance: checkbox;
    -moz-appearance: checkbox;
    appearance: checkbox;
}

input[type="radio"] {
    -webkit-appearance: radio;
    -moz-appearance: radio;
    appearance: radio;
}

/* Fix for Safari and older browsers */
.btn, .card, .modal-content {
    -webkit-transform: translateZ(0);
    -moz-transform: translateZ(0);
    -ms-transform: translateZ(0);
    -o-transform: translateZ(0);
    transform: translateZ(0);
    -webkit-backface-visibility: hidden;
    -moz-backface-visibility: hidden;
    backface-visibility: hidden;
}

/* Fix for Firefox */
@-moz-document url-prefix() {
    .notification {
        transform: translateX(400px);
    }
    
    .notification.show {
        transform: translateX(0);
    }
    
    input, textarea, select {
        -moz-appearance: textfield;
    }
    
    html, body {
        overflow-x: hidden;
    }
}

/* Fix for Edge */
@supports (-ms-ime-align: auto) {
    .notification {
        transform: translateX(400px);
    }
    
    .notification.show {
        transform: translateX(0);
    }
    
    html, body {
        overflow-x: hidden;
    }
}

/* Safari-specific fixes */
@supports (-webkit-appearance: none) {
    input[type="time"],
    input[type="date"],
    input[type="datetime-local"] {
        -webkit-appearance: none;
        background: var(--white);
        border: 1px solid var(--gray-300);
        border-radius: var(--radius-lg);
        padding: var(--space-3) var(--space-4);
        font-size: var(--text-base);
        font-family: var(--font-family);
    }
    
    select {
        -webkit-appearance: none;
        background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6,9 12,15 18,9'%3e%3c/polyline%3e%3c/svg%3e");
        background-repeat: no-repeat;
        background-position: right var(--space-3) center;
        background-size: 16px;
        padding-right: var(--space-10);
    }
    
    html, body {
        overflow-x: hidden;
    }
}

/* iOS Safari specific fixes */
@supports (-webkit-touch-callout: none) {
    input, textarea, select {
        font-size: 16px; /* Prevents zoom on iOS */
        -webkit-appearance: none;
        border-radius: var(--radius-lg);
    }
    
    .btn {
        -webkit-tap-highlight-color: transparent;
        -webkit-touch-callout: none;
        -webkit-user-select: none;
        user-select: none;
    }
    
    html, body {
        overflow-x: hidden;
        -webkit-overflow-scrolling: touch;
    }
}

/* Chrome and Webkit specific fixes */
@media screen and (-webkit-min-device-pixel-ratio: 0) {
    select {
        background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6,9 12,15 18,9'%3e%3c/polyline%3e%3c/svg%3e");
        background-repeat: no-repeat;
        background-position: right var(--space-3) center;
        background-size: 16px;
        padding-right: var(--space-10);
    }
    
    html, body {
        overflow-x: hidden;
    }
}
/* ================================
   Dark Mode Enhancements (1C1C1C)
   ================================ */

/* Extend dark theme variables with unified surfaces and text scales */
[data-theme="dark"] {
    --surface-0: #1C1C1C; /* base */
    --surface-1: #252525; /* elevated */
    --surface-2: #2E2E2E; /* higher */
    --surface-3: #383838; /* highest */
    --text-primary: #F2F2F2;
    --text-secondary: #C9C9C9;
    --text-muted: #A8A8A8;
    --border-soft: #383838;
    --border-strong: #424242;
    --focus-ring: rgb(59 130 246 / 0.45);
    --overlay: rgba(0, 0, 0, 0.6);
}

/* Typography & links */
[data-theme="dark"] body {
    color: var(--gray-800);
}

[data-theme="dark"] h1,
[data-theme="dark"] h2,
[data-theme="dark"] h3,
[data-theme="dark"] h4,
[data-theme="dark"] h5,
[data-theme="dark"] h6 {
    color: var(--gray-900);
}

[data-theme="dark"] p {
    color: var(--gray-600);
}

[data-theme="dark"] a { color: var(--blue-400); }
[data-theme="dark"] a:hover { color: var(--blue-500); }

/* Forms */
[data-theme="dark"] label { color: var(--gray-700); }
[data-theme="dark"] input,
[data-theme="dark"] textarea,
[data-theme="dark"] select {
    background: var(--surface-1);
    border-color: var(--border-soft);
    color: var(--gray-800);
}
[data-theme="dark"] input::placeholder,
[data-theme="dark"] textarea::placeholder { color: var(--text-muted); }
[data-theme="dark"] input:focus,
[data-theme="dark"] textarea:focus,
[data-theme="dark"] select:focus {
    border-color: var(--blue-500);
    box-shadow: 0 0 0 4px var(--focus-ring), var(--shadow-md);
    background: var(--surface-1);
}

/* Surfaces */
[data-theme="dark"] .card,
[data-theme="dark"] .modal-content,
[data-theme="dark"] .notification {
    background: var(--surface-1);
    border-color: var(--border-soft);
    box-shadow: var(--shadow-lg);
}
[data-theme="dark"] .card-header,
[data-theme="dark"] .modal-header {
    background: var(--gray-100);
    border-bottom-color: var(--border-soft);
}

/* Overlay strength */
[data-theme="dark"] .modal-overlay { background: var(--overlay); }

/* Buttons */
[data-theme="dark"] .btn-secondary {
    background: var(--surface-1);
    color: var(--gray-800);
    border: 1px solid var(--border-soft);
}
[data-theme="dark"] .btn-secondary:hover {
    background: var(--surface-2);
    border-color: var(--border-strong);
}
[data-theme="dark"] .btn-outline {
    color: var(--blue-400);
    border: 2px solid var(--blue-300);
}
[data-theme="dark"] .btn-outline:hover {
    background: rgba(59, 130, 246, 0.08);
    border-color: var(--blue-500);
}

/* Loading screen */
[data-theme="dark"] .loading-screen { background: var(--surface-0); }
/* Touch Device Optimizations */
@media (hover: none) and (pointer: coarse) {
    .btn:hover,
    .card:hover {
        transform: none;
    }
    
    .btn:active {
        transform: scale(0.98);
    }
    
    .card:active {
        transform: scale(0.99);
    }
    
    /* Improve touch targets */
    .btn,
    .checkbox,
    .toggle {
        min-height: 44px;
        min-width: 44px;
    }
}

/* Focus Styles for Accessibility */
button:focus,
input:focus,
textarea:focus,
a:focus,
select:focus {
    outline: 2px solid var(--blue-500);
    outline-offset: 2px;
    -webkit-tap-highlight-color: transparent;
}

/* Print Styles */
@media print {
    .notification,
    .modal-overlay {
        display: none !important;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .btn {
        border: 1px solid black;
        background: white;
        color: black;
    }
    
    .card {
        border: 1px solid #ccc;
        box-shadow: none;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --gray-300: #000000;
        --gray-600: #000000;
        --gray-800: #000000;
        --blue-500: #0000ff;
    }
}

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

.profile-layout {
    display: flex;
    min-height: 100vh;
    background: 
        radial-gradient(circle at 20% 20%, rgba(59, 130, 246, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(147, 197, 253, 0.02) 0%, transparent 50%),
        var(--gray-50);
    position: relative;
    overflow-x: hidden;
    scrollbar-width: none;
    scrollbar-color: transparent transparent;
    -ms-overflow-style: none;
}

.profile-layout::-webkit-scrollbar {
    width: 0px;
    display: none;
}

.profile-layout::-webkit-scrollbar-track {
    display: none;
}

.profile-layout::-webkit-scrollbar-thumb {
    display: none;
}