/*
 * NextEmail.ai Design System
 * ==========================
 * Shared design tokens and components for marketing site and app
 * Version: 1.0.0
 */

/* =========================================================================
   CSS VARIABLES (Design Tokens)
   ========================================================================= */

:root {
    /* Brand Colors - Indigo */
    --color-brand-50: #eef2ff;
    --color-brand-100: #e0e7ff;
    --color-brand-200: #c7d2fe;
    --color-brand-300: #a5b4fc;
    --color-brand-400: #818cf8;
    --color-brand-500: #6366f1;
    --color-brand-600: #4f46e5;
    --color-brand-700: #4338ca;
    --color-brand-800: #3730a3;
    --color-brand-900: #312e81;

    /* Accent Colors - Violet */
    --color-accent-50: #f5f3ff;
    --color-accent-100: #ede9fe;
    --color-accent-200: #ddd6fe;
    --color-accent-300: #c4b5fd;
    --color-accent-400: #a78bfa;
    --color-accent-500: #8b5cf6;
    --color-accent-600: #7c3aed;
    --color-accent-700: #6d28d9;
    --color-accent-800: #5b21b6;
    --color-accent-900: #4c1d95;

    /* Neutral Colors */
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;
    --color-gray-950: #030712;

    /* Semantic Colors */
    --color-success: #22c55e;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-info: #3b82f6;

    /* Typography */
    --font-display: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', monospace;

    /* 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;
    --text-7xl: 4.5rem;

    /* Font Weights */
    --font-light: 300;
    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;
    --font-extrabold: 800;

    /* Line Heights */
    --leading-none: 1;
    --leading-tight: 1.25;
    --leading-snug: 1.375;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;

    /* Spacing */
    --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;

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-2xl: 1rem;
    --radius-3xl: 1.5rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --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);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;

    /* Z-Index */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

/* =========================================================================
   BASE RESET & TYPOGRAPHY
   ========================================================================= */

*, *::before, *::after {
    box-sizing: border-box;
}

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

body {
    margin: 0;
    font-family: var(--font-body);
    font-size: var(--text-base);
    font-weight: var(--font-normal);
    line-height: var(--leading-normal);
    color: var(--color-gray-900);
    background-color: #ffffff;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: var(--font-semibold);
    line-height: var(--leading-tight);
    margin: 0 0 var(--space-4);
    color: var(--color-gray-900);
}

h1 { font-size: var(--text-5xl); font-weight: var(--font-bold); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-3xl); }
h4 { font-size: var(--text-2xl); }
h5 { font-size: var(--text-xl); }
h6 { font-size: var(--text-lg); }

p {
    margin: 0 0 var(--space-4);
}

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

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

/* =========================================================================
   BUTTONS
   ========================================================================= */

.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-body);
    font-size: var(--text-base);
    font-weight: var(--font-medium);
    line-height: var(--leading-normal);
    text-decoration: none;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
}

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

/* Primary Button */
.btn-primary {
    color: #ffffff;
    background: linear-gradient(135deg, var(--color-brand-600), var(--color-accent-600));
    box-shadow: 0 4px 14px 0 rgba(99, 102, 241, 0.35);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--color-brand-700), var(--color-accent-700));
    box-shadow: 0 6px 20px 0 rgba(99, 102, 241, 0.45);
    transform: translateY(-1px);
}

/* Secondary Button */
.btn-secondary {
    color: var(--color-gray-700);
    background: #ffffff;
    border: 1px solid var(--color-gray-300);
}

.btn-secondary:hover {
    background: var(--color-gray-50);
    border-color: var(--color-gray-400);
}

/* Ghost Button */
.btn-ghost {
    color: var(--color-gray-600);
    background: transparent;
}

.btn-ghost:hover {
    color: var(--color-gray-900);
    background: var(--color-gray-100);
}

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

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

/* =========================================================================
   CARDS
   ========================================================================= */

.card {
    background: #ffffff;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-lg);
    padding: var(--space-8);
}

.card-bordered {
    border: 1px solid var(--color-gray-200);
    box-shadow: var(--shadow-sm);
}

/* Glass Card */
.card-glass {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

/* =========================================================================
   FORM ELEMENTS
   ========================================================================= */

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

.form-label {
    display: block;
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--color-gray-700);
    margin-bottom: var(--space-2);
}

.form-input {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-family: var(--font-body);
    font-size: var(--text-base);
    color: var(--color-gray-900);
    background: #ffffff;
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.form-input:focus {
    outline: none;
    border-color: var(--color-brand-500);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-input::placeholder {
    color: var(--color-gray-400);
}

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

/* =========================================================================
   BADGES
   ========================================================================= */

.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1) var(--space-3);
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    border-radius: var(--radius-full);
}

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

.badge-success {
    color: #166534;
    background: #dcfce7;
}

.badge-warning {
    color: #a16207;
    background: #fef3c7;
}

/* =========================================================================
   GRADIENT BACKGROUNDS
   ========================================================================= */

.bg-gradient-brand {
    background: linear-gradient(135deg, var(--color-brand-600), var(--color-accent-600));
}

.bg-gradient-subtle {
    background: linear-gradient(135deg, var(--color-brand-50), var(--color-accent-50));
}

/* Animated Orb Background */
.bg-orbs {
    position: relative;
    overflow: hidden;
}

.bg-orbs::before,
.bg-orbs::after {
    content: '';
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.6;
    animation: float 20s ease-in-out infinite;
}

.bg-orbs::before {
    width: 400px;
    height: 400px;
    background: var(--color-brand-400);
    top: -100px;
    right: -100px;
}

.bg-orbs::after {
    width: 350px;
    height: 350px;
    background: var(--color-accent-400);
    bottom: -80px;
    left: -80px;
    animation-delay: -10s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(20px, -30px) scale(1.05); }
    50% { transform: translate(-20px, 20px) scale(0.95); }
    75% { transform: translate(30px, 10px) scale(1.02); }
}

/* =========================================================================
   UTILITIES
   ========================================================================= */

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.container-sm {
    max-width: 640px;
}

.container-lg {
    max-width: 1400px;
}

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

.text-brand { color: var(--color-brand-600); }
.text-muted { color: var(--color-gray-500); }
.text-white { color: #ffffff; }

.font-bold { font-weight: var(--font-bold); }
.font-semibold { font-weight: var(--font-semibold); }
.font-medium { font-weight: var(--font-medium); }

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

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

@media (max-width: 768px) {
    h1 { font-size: var(--text-4xl); }
    h2 { font-size: var(--text-3xl); }
    h3 { font-size: var(--text-2xl); }

    .container {
        padding: 0 var(--space-4);
    }
}