/* Global Styles for ThinkForge Website */

/* ============================================
   THEME SYSTEM - CSS Variables
   ============================================ */

:root {
    /* Warm White Light Theme */
    --bg-primary: #FAFAF8;
    --bg-secondary: #F0F0EC;
    --bg-tertiary: #E8E8E3;
    --text-primary: #1A1A1A;
    --text-secondary: #5C5C5C;
    --text-tertiary: #8A8A8A;
    --border-color: #E2E2DE;
    --shadow-sm: rgba(0, 0, 0, 0.04);
    --shadow-md: rgba(0, 0, 0, 0.06);
    --shadow-lg: rgba(0, 0, 0, 0.10);
    --brand-primary: #2563EB;
    --brand-primary-hover: #1D4ED8;
    --brand-gradient-start: #2563EB;
    --brand-gradient-end: #2563EB;
    --accent-primary: #2563EB;
    --accent-hover: #1D4ED8;
    --color-success: #10b981;
    --color-success-bg: #d1fae5;
    --color-success-text: #059669;
    --color-error: #ef4444;
    --color-error-bg: #fee2e2;
    --color-error-text: #dc2626;
    --navbar-bg: #FAFAF8;
    --footer-bg: #252538;
    --footer-text: #9ca3af;
    --footer-heading: #ffffff;
    --card-bg: #FFFFFF;
    --input-bg: #FFFFFF;
    --input-border: #E2E2DE;
    --input-focus: #2563EB;
    --glass-bg: rgba(0, 0, 0, 0.03);
    --glass-border: rgba(0, 0, 0, 0.06);
    --code-bg: #F0F0EC;
    --tag-bg: #E8EDFB;
    --tag-text: #2563EB;
}

/* Dark Theme - Matches Tailwind gray-950/gray-900 for consistency */
[data-theme="dark"],
.theme-dark,
html.dark {
    --bg-primary: #030712;
    --bg-secondary: #111827;
    --bg-tertiary: #1f2937;
    --text-primary: #ffffff;
    --text-secondary: #d1d5db;
    --text-tertiary: #9ca3af;
    --border-color: #374151;
    --shadow-sm: rgba(0, 0, 0, 0.4);
    --shadow-md: rgba(0, 0, 0, 0.5);
    --shadow-lg: rgba(0, 0, 0, 0.6);
    --brand-primary: #3b82f6;
    --brand-primary-hover: #2563eb;
    --brand-gradient-start: #3b82f6;
    --brand-gradient-end: #3b82f6;
    --accent-primary: #3b82f6;
    --accent-hover: #2563eb;
    --color-success: #10b981;
    --color-success-bg: #064e3b;
    --color-success-text: #6ee7b7;
    --color-error: #ef4444;
    --color-error-bg: #7f1d1d;
    --color-error-text: #fca5a5;
    --navbar-bg: #111827;
    --footer-bg: #030712;
    --footer-text: #9ca3af;
    --footer-heading: #ffffff;
    --card-bg: #111827;
    --input-bg: #1f2937;
    --input-border: #374151;
    --input-focus: #3b82f6;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
}

@media (prefers-color-scheme: dark) {
    .theme-auto {
        --bg-primary: #030712;
        --bg-secondary: #111827;
        --bg-tertiary: #1f2937;
        --text-primary: #ffffff;
        --text-secondary: #d1d5db;
        --text-tertiary: #9ca3af;
        --border-color: #374151;
        --shadow-sm: rgba(0, 0, 0, 0.4);
        --shadow-md: rgba(0, 0, 0, 0.5);
        --shadow-lg: rgba(0, 0, 0, 0.6);
        --brand-primary: #3b82f6;
        --brand-primary-hover: #2563eb;
        --brand-gradient-start: #3b82f6;
        --brand-gradient-end: #3b82f6;
        --accent-primary: #3b82f6;
        --accent-hover: #2563eb;
        --color-success: #10b981;
        --color-success-bg: #064e3b;
        --color-success-text: #6ee7b7;
        --color-error: #ef4444;
        --color-error-bg: #7f1d1d;
        --color-error-text: #fca5a5;
        --navbar-bg: #111827;
        --footer-bg: #030712;
        --footer-text: #9ca3af;
        --footer-heading: #ffffff;
        --card-bg: #111827;
        --input-bg: #1f2937;
        --input-border: #374151;
        --input-focus: #3b82f6;
        --glass-bg: rgba(255, 255, 255, 0.05);
        --glass-border: rgba(255, 255, 255, 0.1);
    }
}

/* Smooth theme transitions */
body,
.navbar,
.card,
input,
textarea,
.btn {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

/* ============================================
   SEMANTIC COLOR UTILITIES
   Replacements for Tailwind color classes.
   These consume the theme variables above so
   colors switch automatically in dark mode.
   ============================================ */

/* --- Backgrounds --- */
.bg-surface { background-color: var(--bg-primary); }
.bg-surface-card { background-color: var(--card-bg); }
.bg-surface-secondary { background-color: var(--bg-secondary); }
.bg-surface-tertiary { background-color: var(--bg-tertiary); }
.bg-accent { background-color: var(--accent-primary); }
.bg-accent-hover { background-color: var(--accent-hover); }
.bg-brand { background-color: var(--brand-primary); }
.bg-navbar { background-color: var(--navbar-bg); }
.bg-input { background-color: var(--input-bg); }
.bg-code { background-color: var(--code-bg); }
.bg-tag { background-color: var(--tag-bg); }
.bg-success { background-color: var(--color-success-bg); }
.bg-error { background-color: var(--color-error-bg); }
.bg-glass { background-color: var(--glass-bg); }

/* --- Text --- */
.text-content { color: var(--text-primary); }
.text-content-secondary { color: var(--text-secondary); }
.text-content-tertiary { color: var(--text-tertiary); }
.text-accent { color: var(--accent-primary); }
.text-brand { color: var(--brand-primary); }
.text-tag { color: var(--tag-text); }
.text-success { color: var(--color-success-text); }
.text-error { color: var(--color-error-text); }

/* --- Borders --- */
.border-theme { border-color: var(--border-color); }
.border-accent { border-color: var(--accent-primary); }
.border-input { border-color: var(--input-border); }
.border-glass { border-color: var(--glass-border); }

/* --- Hover states --- */
.hover\:bg-surface:hover { background-color: var(--bg-primary); }
.hover\:bg-surface-secondary:hover { background-color: var(--bg-secondary); }
.hover\:bg-surface-tertiary:hover { background-color: var(--bg-tertiary); }
.hover\:bg-accent:hover { background-color: var(--accent-primary); }
.hover\:bg-accent-hover:hover { background-color: var(--accent-hover); }
.hover\:text-content:hover { color: var(--text-primary); }
.hover\:text-accent:hover { color: var(--accent-primary); }
.hover\:text-accent-hover:hover { color: var(--accent-hover); }
.hover\:text-brand:hover { color: var(--brand-primary); }
.hover\:border-accent:hover { border-color: var(--accent-primary); }
.hover\:shadow-accent:hover { box-shadow: 0 10px 25px -5px color-mix(in srgb, var(--accent-primary) 20%, transparent); }

/* --- Focus states --- */
.focus\:ring-accent:focus { box-shadow: 0 0 0 2px var(--bg-primary), 0 0 0 4px var(--accent-primary); }
.focus\:border-accent:focus { border-color: var(--accent-primary); }

/* --- Group hover --- */
.group:hover .group-hover\:text-accent { color: var(--accent-primary); }
.group:hover .group-hover\:text-brand { color: var(--brand-primary); }

/* --- Gradients --- */
.bg-gradient-brand {
    background: linear-gradient(to right, var(--brand-gradient-start), var(--brand-gradient-end));
}
.bg-gradient-accent {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-hover));
}

/* --- Shadows with theme colors --- */
.shadow-accent { box-shadow: 0 10px 25px -5px color-mix(in srgb, var(--accent-primary) 30%, transparent); }
.shadow-theme { box-shadow: 0 2px 8px var(--shadow-sm); }

/* --- Placeholder --- */
.placeholder-content-secondary::placeholder { color: var(--text-secondary); }
.placeholder-content-tertiary::placeholder { color: var(--text-tertiary); }

/* ============================================
   CSS Reset & Base
   ============================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navigation */
.navbar {
    background: var(--navbar-bg);
    box-shadow: 0 2px 4px var(--shadow-sm);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--brand-primary);
}

.navbar-brand a {
    text-decoration: none;
    color: inherit;
}

.navbar-menu {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.navbar-start {
    display: flex;
    gap: 1.5rem;
}

.navbar-end {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.navbar-item {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    transition: color 0.3s;
}

.navbar-item:hover {
    color: var(--brand-primary);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background: var(--brand-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-md);
}

.btn-secondary {
    background: transparent;
    color: var(--brand-primary);
    border: 2px solid var(--brand-primary);
}

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

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

/* Footer */
footer {
    background: var(--footer-bg);
    color: var(--footer-text);
    padding: 3rem 0 1rem;
    margin-top: auto;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    margin-bottom: 1rem;
    font-size: 1.1rem;
    color: var(--footer-heading);
    font-weight: 600;
}

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

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: var(--footer-text);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section a:hover {
    color: var(--footer-heading);
}

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
    text-align: center;
    color: var(--text-tertiary);
    font-size: 0.9rem;
}

/* Main Content */
main {
    min-height: calc(100vh - 200px);
}

/* Links */
a {
    color: var(--brand-primary);
    transition: color 0.3s;
}

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

/* Headings */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

/* Responsive */
@media (max-width: 768px) {
    .navbar-menu {
        flex-direction: column;
        gap: 1rem;
    }
    
    .navbar-start {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .navbar-end {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.75rem;
    }
}

/* Loading & Transitions */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

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

/* Forms (for future use) */
input[type="text"],
input[type="email"],
input[type="password"],
textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--input-border);
    border-radius: 8px;
    font-size: 1rem;
    background: var(--input-bg);
    color: var(--text-primary);
    transition: border-color 0.3s;
}

input:focus,
textarea:focus {
    outline: none;
    border-color: var(--input-focus);
}

/* Cards */
.card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 2px 8px var(--shadow-sm);
}

/* Logo */
.logo {
    background: linear-gradient(135deg, var(--brand-gradient-start) 0%, var(--brand-gradient-end) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 800;
}

/* Theme Toggle Button (optional UI component) */
.theme-toggle {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.5rem 1rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    background: var(--bg-tertiary);
    transform: translateY(-1px);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
    fill: var(--text-primary);
}