/* =============================================================================
   TAO WEB SERVICES - SHARED STYLES
   Light mode default, dark mode toggle - Desktop First
============================================================================= */

:root {
    /* Light Mode (Default) */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-card: #ffffff;
    --border: #e5e7eb;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    --accent: #0d9488;
    --accent-hover: #0f766e;
    --danger: #dc2626;
    --success: #16a34a;
    --warning: #d97706;
    --shadow: 0 1px 3px rgba(0,0,0,0.1);
}

[data-theme="dark"] {
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --bg-card: #1a1a1a;
    --border: #2a2a2a;
    --text-primary: #ffffff;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    --accent: #14b8a6;
    --accent-hover: #2dd4bf;
    --danger: #ef4444;
    --success: #22c55e;
    --warning: #f59e0b;
    --shadow: 0 1px 3px rgba(0,0,0,0.3);
}

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

html {
    height: 100%;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* =============================================================================
   HEADER - Desktop First
============================================================================= */
.site-header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color 0.3s, border-color 0.3s;
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text-primary);
}

.logo-icon {
    width: 40px;
    height: 40px;
    border: 2px solid var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 18px;
    transition: border-color 0.3s;
}

.logo-text {
    font-size: 16px;
    font-weight: 600;
    letter-spacing: -0.5px;
}

.logo-subtitle {
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Theme Toggle */
.theme-toggle {
    margin-left: 8px;
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    transition: all 0.2s;
}

.theme-toggle:hover {
    background: var(--bg-secondary);
    border-color: var(--text-muted);
}

/* =============================================================================
   BUTTONS
============================================================================= */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    font-size: 13px;
    font-weight: 500;
    font-family: inherit;
    text-decoration: none;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text-primary);
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.2s;
    white-space: nowrap;
}

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

.btn-primary {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.btn-primary:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
    color: #fff;
}

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

.btn-danger:hover {
    background: var(--danger);
    color: #fff;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
}

/* =============================================================================
   CARDS
============================================================================= */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 24px;
    transition: background-color 0.3s, border-color 0.3s;
}

.card:hover {
    border-color: var(--text-muted);
}

/* =============================================================================
   FORMS
============================================================================= */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-size: 12px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.form-input {
    width: 100%;
    padding: 12px 16px;
    font-size: 14px;
    font-family: inherit;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    transition: all 0.2s;
}

.form-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.1);
}

.form-input::placeholder {
    color: var(--text-muted);
}

/* =============================================================================
   ALERTS
============================================================================= */
.alert {
    padding: 16px 20px;
    border-radius: 6px;
    margin-bottom: 24px;
    font-size: 14px;
}

.alert-success {
    background: rgba(22, 163, 74, 0.1);
    border: 1px solid var(--success);
    color: var(--success);
}

.alert-danger {
    background: rgba(220, 38, 38, 0.1);
    border: 1px solid var(--danger);
    color: var(--danger);
}

.alert-info {
    background: rgba(13, 148, 136, 0.1);
    border: 1px solid var(--accent);
    color: var(--accent);
}

/* =============================================================================
   FOOTER - Sticky to bottom
============================================================================= */
.site-footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 24px 0;
    margin-top: auto;
    transition: background-color 0.3s, border-color 0.3s;
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    color: var(--text-muted);
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: var(--text-muted);
}

.footer-links a:hover {
    color: var(--text-primary);
}

/* =============================================================================
   UTILITIES
============================================================================= */
.text-muted { color: var(--text-muted); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }

code {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 12px;
    background: var(--bg-secondary);
    padding: 2px 6px;
    border-radius: 4px;
}

/* =============================================================================
   RESPONSIVE - Mobile only adjustments (Desktop First)
============================================================================= */
@media (max-width: 900px) {
    .header-nav .btn { padding: 8px 12px; font-size: 12px; }
}

@media (max-width: 700px) {
    .header-inner { flex-direction: column; gap: 16px; }
    .header-nav { width: 100%; justify-content: center; flex-wrap: wrap; }
    .footer-inner { flex-direction: column; gap: 16px; text-align: center; }
}

/* Logo Image Support */
.logo img {
    height: 40px;
    width: auto;
    border-radius: 6px;
}

/* Logo visibility based on theme */
.logo-light { display: block; }
.logo-dark { display: none; }

[data-theme="dark"] .logo-light { display: none; }
[data-theme="dark"] .logo-dark { display: block; }

/* If only one logo exists, show it in both modes */
.logo img:only-of-type { display: block !important; }