:root {
    /* ========================================
     PRIMARY COLORS - Trust & Security
     ======================================== */
    --primary-950: #0f172a;
    --primary-900: #1e3a8a;
    --primary-800: #1e40af;
    --primary-700: #1d4ed8;
    --primary-600: #2563eb;
    --primary-500: #3b82f6;
    --primary-400: #60a5fa;
    --primary-300: #93c5fd;
    --primary-200: #bfdbfe;
    --primary-100: #dbeafe;
    --primary-50: #eff6ff;

    /* ========================================
     ACCENT COLORS - Success & Safety
     ======================================== */
    --accent-700: #047857;
    --accent-600: #059669;
    --accent-500: #10b981;
    --accent-400: #34d399;
    --accent-300: #6ee7b7;
    --accent-200: #a7f3d0;
    --accent-100: #d1fae5;
    --accent-50: #ecfdf5;

    /* ========================================
     WARNING COLORS - Locked Features
     ======================================== */
    --warning-600: #d97706;
    --warning-500: #f59e0b;
    --warning-400: #fbbf24;
    --warning-300: #fcd34d;
    --warning-200: #fde68a;
    --warning-100: #fef3c7;
    --warning-50: #fffbeb;

    /* ========================================
     NEUTRAL COLORS - Base
     ======================================== */
    --neutral-950: #030712;
    --neutral-900: #111827;
    --neutral-800: #1f2937;
    --neutral-700: #374151;
    --neutral-600: #4b5563;
    --neutral-500: #6b7280;
    --neutral-400: #9ca3af;
    --neutral-300: #d1d5db;
    --neutral-200: #e5e7eb;
    --neutral-100: #f3f4f6;
    --neutral-50: #f9fafb;

    /* ========================================
     SEMANTIC COLORS
     ======================================== */
    --success: #10b981;
    --error: #ef4444;
    --info: #3b82f6;
    --warning: #f59e0b;

    /* ========================================
     BACKGROUND & SURFACE
     ======================================== */
    --background: #ffffff;
    --surface: #f9fafb;
    --surface-elevated: #ffffff;

    /* ========================================
     TEXT COLORS
     ======================================== */
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --text-tertiary: #9ca3af;
    --text-inverse: #ffffff;

    /* ========================================
     TYPOGRAPHY
     ======================================== */
    --font-family-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    --font-family-display: 'Poppins', sans-serif;
    --font-family-mono: 'Fira Code', 'Courier New', monospace;

    --font-size-xs: 0.75rem;
    /* 12px */
    --font-size-sm: 0.875rem;
    /* 14px */
    --font-size-base: 1rem;
    /* 16px */
    --font-size-lg: 1.125rem;
    /* 18px */
    --font-size-xl: 1.25rem;
    /* 20px */
    --font-size-2xl: 1.5rem;
    /* 24px */
    --font-size-3xl: 1.875rem;
    /* 30px */
    --font-size-4xl: 2.25rem;
    /* 36px */
    --font-size-5xl: 3rem;
    /* 48px */
    --font-size-6xl: 3.75rem;
    /* 60px */

    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;

    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;

    /* ========================================
     SPACING SYSTEM
     ======================================== */
    --space-0: 0;
    --space-1: 0.25rem;
    /* 4px */
    --space-2: 0.5rem;
    /* 8px */
    --space-3: 0.75rem;
    /* 12px */
    --space-4: 1rem;
    /* 16px */
    --space-5: 1.25rem;
    /* 20px */
    --space-6: 1.5rem;
    /* 24px */
    --space-8: 2rem;
    /* 32px */
    --space-10: 2.5rem;
    /* 40px */
    --space-12: 3rem;
    /* 48px */
    --space-16: 4rem;
    /* 64px */
    --space-20: 5rem;
    /* 80px */
    --space-24: 6rem;
    /* 96px */

    /* ========================================
     BORDER RADIUS
     ======================================== */
    --radius-none: 0;
    --radius-sm: 0.375rem;
    /* 6px */
    --radius-md: 0.5rem;
    /* 8px */
    --radius-lg: 0.75rem;
    /* 12px */
    --radius-xl: 1rem;
    /* 16px */
    --radius-2xl: 1.5rem;
    /* 24px */
    --radius-3xl: 2rem;
    /* 32px */
    --radius-full: 9999px;

    /* ========================================
     SHADOWS
     ======================================== */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-glow: 0 0 20px rgba(59, 130, 246, 0.3);
    --shadow-glow-accent: 0 0 20px rgba(16, 185, 129, 0.3);

    /* ========================================
     TRANSITIONS
     ======================================== */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 600ms cubic-bezier(0.68, -0.55, 0.265, 1.55);

    /* ========================================
     Z-INDEX LAYERS
     ======================================== */
    --z-base: 0;
    --z-dropdown: 1000;
    --z-sticky: 1100;
    --z-fixed: 1200;
    --z-modal-backdrop: 1300;
    --z-modal: 1400;
    --z-popover: 1500;
    --z-tooltip: 1600;
    --z-notification: 1700;
}

/* ========================================
   DARK MODE COLORS
   ======================================== */
.dark-mode {
    --background: #0f172a;
    --surface: #1e293b;
    --surface-elevated: #334155;

    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-tertiary: #64748b;
    --text-inverse: #0f172a;

    --primary-50: #1e3a8a;
    --primary-100: #1d4ed8;

    --neutral-50: #1f2937;
    --neutral-100: #374151;
    --neutral-200: #4b5563;
}

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

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

body {
    font-family: var(--font-family-primary);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--text-primary);
    background-color: var(--background);
    min-height: 100vh;
    transition: background-color var(--transition-base), color var(--transition-base);
}

/* ========================================
   TYPOGRAPHY UTILITIES
   ======================================== */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-family-display);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    color: var(--text-primary);
}

h1 {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--space-6);
}

h2 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--space-5);
}

h3 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--space-4);
}

p {
    margin-bottom: var(--space-4);
}

a {
    color: var(--primary-600);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

/* ========================================
   BUTTON COMPONENTS
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-family: var(--font-family-primary);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    line-height: 1;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-600), var(--primary-500));
    color: var(--text-inverse);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--primary-700), var(--primary-600));
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--neutral-100);
    color: var(--text-primary);
    border: 1px solid var(--neutral-300);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--neutral-200);
    border-color: var(--neutral-400);
    transform: translateY(-1px);
}

.btn-accent {
    background: linear-gradient(135deg, var(--accent-600), var(--accent-500));
    color: var(--text-inverse);
    box-shadow: var(--shadow-md);
}

.btn-accent:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--accent-700), var(--accent-600));
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow-accent);
}

.btn-danger {
    background: linear-gradient(135deg, #dc2626, #ef4444);
    color: var(--text-inverse);
}

.btn-danger:hover:not(:disabled) {
    background: linear-gradient(135deg, #b91c1c, #dc2626);
    transform: translateY(-2px);
}

.btn-ghost {
    background: transparent;
    color: var(--text-primary);
}

.btn-ghost:hover:not(:disabled) {
    background: var(--neutral-100);
}

/* Button Sizes */
.btn-sm {
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-sm);
}

.btn-lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--font-size-lg);
}

.btn-xl {
    padding: var(--space-5) var(--space-10);
    font-size: var(--font-size-xl);
}

.btn-block {
    width: 100%;
}

/* ========================================
   CARD COMPONENTS (Glassmorphism)
   ======================================== */
.card {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-base);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: rgba(59, 130, 246, 0.3);
}

.dark-mode .card {
    background: rgba(30, 41, 59, 0.8);
    border-color: rgba(255, 255, 255, 0.1);
}

.card-flat {
    background: var(--surface);
    backdrop-filter: none;
    border: 1px solid var(--neutral-200);
}

.card-elevated {
    background: var(--surface-elevated);
    box-shadow: var(--shadow-2xl);
}

/* ========================================
   BADGE & PILL COMPONENTS
   ======================================== */
.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-3);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-primary {
    background: var(--primary-100);
    color: var(--primary-700);
}

.badge-accent {
    background: var(--accent-100);
    color: var(--accent-700);
}

.badge-warning {
    background: var(--warning-100);
    color: var(--warning-700);
}

.badge-success {
    background: var(--accent-100);
    color: var(--accent-700);
}

.badge-error {
    background: #fee2e2;
    color: #991b1b;
}

.trust-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--accent-100);
    color: var(--accent-700);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
}

/* ========================================
   INPUT COMPONENTS
   ======================================== */
.input {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-family: var(--font-family-primary);
    font-size: var(--font-size-base);
    color: var(--text-primary);
    background: var(--surface);
    border: 1px solid var(--neutral-300);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.input:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

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

.input-error {
    border-color: var(--error);
}

.input-error:focus {
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

/* ========================================
   FORM GROUPS
   ======================================== */
.form-group {
    margin-bottom: var(--space-5);
}

.form-label {
    display: block;
    margin-bottom: var(--space-2);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--text-primary);
}

.form-error {
    display: block;
    margin-top: var(--space-2);
    font-size: var(--font-size-sm);
    color: var(--error);
}

/* ========================================
   LOADING & SPINNER
   ======================================== */
.loading {
    display: inline-block;
    width: 40px;
    height: 40px;
    border: 4px solid var(--neutral-200);
    border-top: 4px solid var(--primary-500);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

.loading-sm {
    width: 20px;
    height: 20px;
    border-width: 2px;
}

.loading-lg {
    width: 60px;
    height: 60px;
    border-width: 5px;
}

/* ========================================
   CHECKMARK ANIMATION
   ======================================== */
.checkmark {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-500);
    color: white;
    font-size: 30px;
    margin: 0 auto;
    animation: checkmark-pop 0.5s var(--transition-bounce);
}

@keyframes checkmark-pop {
    0% {
        transform: scale(0);
    }

    50% {
        transform: scale(1.1);
    }

    100% {
        transform: scale(1);
    }
}

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

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

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

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

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

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

.text-muted {
    color: var(--text-tertiary);
}

.text-error {
    color: var(--error);
}

.text-success {
    color: var(--success);
}

.mb-0 {
    margin-bottom: 0;
}

.mb-2 {
    margin-bottom: var(--space-2);
}

.mb-4 {
    margin-bottom: var(--space-4);
}

.mb-6 {
    margin-bottom: var(--space-6);
}

.mb-8 {
    margin-bottom: var(--space-8);
}

.mt-0 {
    margin-top: 0;
}

.mt-2 {
    margin-top: var(--space-2);
}

.mt-4 {
    margin-top: var(--space-4);
}

.mt-6 {
    margin-top: var(--space-6);
}

.mt-8 {
    margin-top: var(--space-8);
}

.p-4 {
    padding: var(--space-4);
}

.p-6 {
    padding: var(--space-6);
}

.p-8 {
    padding: var(--space-8);
}

/* ========================================
   RESPONSIVE UTILITIES
   ======================================== */
@media (max-width: 768px) {
    :root {
        --font-size-4xl: 1.875rem;
        /* 30px on mobile */
        --font-size-3xl: 1.5rem;
        /* 24px on mobile */
    }

    h1 {
        font-size: var(--font-size-3xl);
    }

    h2 {
        font-size: var(--font-size-2xl);
    }
}/* ==================================================
   INTERACTIVE LOGO - Universal Styles
   ================================================== */

/* Logo Interactive States */
a.logo,
.logo-link {
    transition: all var(--transition-base);
    cursor: pointer;
}

a.logo:hover,
.logo-link:hover {
    transform: translateY(-2px);
}

a.logo:active,
.logo-link:active {
    transform: scale(0.95);
}

/* Logo Icon/Image Spin */
a.logo img,
a.logo .logo-icon,
.logo-link img,
.logo-link .logo-icon {
    transition: transform var(--transition-bounce);
}

a.logo:hover img,
a.logo:hover .logo-icon,
.logo-link:hover img,
.logo-link:hover .logo-icon {
    transform: rotate(360deg) scale(1.1);
}

/* Logo Bounce Animation on Click */
a.logo.clicked img,
a.logo.clicked .logo-icon,
.logo-link.clicked img,
.logo-link.clicked .logo-icon {
    animation: logo-bounce 0.6s ease;
}

@keyframes logo-bounce {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    25% { transform: translateY(-10px) rotate(10deg); }
    50% { transform: translateY(0) rotate(0deg); }
    75% { transform: translateY(-5px) rotate(-10deg); }
}