/* ── Theme Definitions ── */
:root, [data-theme="light"] {
    --bg-base: #f8f9fa;
    --bg-surface: #ffffff;
    --bg-elevated: #f4f4f5;
    
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    
    --border-color: #e5e7eb;
    --border-hover: #d1d5db;
    
    --accent-blue: #2563eb;
    --accent-blue-hover: #1d4ed8;
    --accent-dark: #111827;
    --accent-dark-text: #ffffff;
    
    --success: #10b981;
    --danger: #ef4444;
    
    --header-blur: rgba(255, 255, 255, 0.85);
    
    --radius-card: 24px;
    --radius-pill: 99px;
    
    --font-sans: 'Inter', -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    color-scheme: light;
}

[data-theme="dark"] {
    --bg-base: #0f1115;
    --bg-surface: #1a1d24;
    --bg-elevated: #27272a;
    
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    
    --border-color: #374151;
    --border-hover: #4b5563;
    
    --accent-blue: #3b82f6;
    --accent-blue-hover: #60a5fa;
    --accent-dark: #f3f4f6;
    --accent-dark-text: #0f1115;
    
    --success: #34d399;
    --danger: #f87171;
    
    --header-blur: rgba(15, 17, 21, 0.85);
    
    color-scheme: dark;
}

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

body {
    font-family: var(--font-sans);
    background: var(--bg-base);
    color: var(--text-primary);
    height: 100vh; /* Lock to viewport height */
    overflow: hidden; /* Prevent global scrollbar */
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* ── Navbar (Glassmorphism) ── */
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: var(--header-blur);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0.875rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.brand-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    width: 32px;
    height: 32px;
}

.brand {
    font-size: 0.9375rem;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.brand-sub {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding-left: 0.75rem;
    border-left: 1px solid var(--border-color);
}

.header-actions { display: flex; align-items: center; gap: 1rem; }
.header-divider { width: 1px; height: 20px; background: var(--border-color); }

/* Theme Tabs */
.theme-tabs {
    display: flex;
    background: var(--bg-elevated);
    padding: 4px;
    border-radius: var(--radius-pill);
    border: 1px solid var(--border-color);
}

.theme-tab {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 6px;
    width: 28px;
    height: 28px;
    justify-content: center;
    border-radius: var(--radius-pill);
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.theme-tab:hover:not(.active) { color: var(--text-primary); }
.theme-tab.active {
    background: var(--bg-surface);
    color: var(--text-primary);
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

.icon-link { color: var(--text-secondary); display: flex; transition: color 0.2s ease; }
.icon-link:hover { color: var(--text-primary); }

/* Header Navigation */
.header-nav {
    display: flex;
    align-items: center;
}

.nav-link {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

/* Fancy GitHub Star Button */
.github-star-btn {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: linear-gradient(135deg, #24292e 0%, #1a1e22 100%);
    color: white;
    padding: 6px 14px;
    border-radius: var(--radius-pill);
    text-decoration: none;
    font-size: 0.8125rem;
    font-weight: 600;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(255, 255, 255, 0.1) inset;
    border: none;
}

[data-theme="dark"] .github-star-btn {
    background: linear-gradient(135deg, #374151 0%, #1f2937 100%);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3), 0 0 0 1px rgba(255, 255, 255, 0.05) inset;
}

.github-star-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2), 0 0 0 1px rgba(255, 255, 255, 0.2) inset;
    background: linear-gradient(135deg, #2f363d 0%, #24292e 100%);
}

.github-icon {
    opacity: 0.9;
    transition: transform 0.3s ease;
}

.github-star-btn:hover .github-icon {
    transform: rotate(-10deg) scale(1.1);
}

.github-star-divider {
    width: 1px;
    height: 14px;
    background: rgba(255, 255, 255, 0.2);
}

.github-star-count-wrapper {
    display: flex;
    align-items: center;
    gap: 4px;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.9);
}

.star-mini-icon {
    color: #fbbf24;
}

/* ── Typography Header ── */
.top-header {
    text-align: center;
    padding: 1.5rem; /* Reduced padding to save vertical space */
}
.top-header h1 {
    font-size: 0.875rem; /* Much smaller subtitle */
    font-weight: 500;
    color: var(--text-secondary);
    line-height: 1.6;
    max-width: 800px;
    margin: 0 auto;
    opacity: 0.8;
}

/* ── Layout ── */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1.5rem 1rem;
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    flex: 1;
    min-height: 0; /* Critical for flex child vertical containment */
    overflow: hidden;
}

/* ── Toolbar ── */
.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.format-switcher {
    display: flex;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-pill);
    padding: 4px;
}

.format-btn {
    background: transparent;
    border: none;
    padding: 8px 20px;
    border-radius: var(--radius-pill);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.format-btn.active {
    background: var(--accent-dark);
    color: var(--accent-dark-text);
}

.toolbar-right { display: flex; align-items: center; gap: 1rem; }

.limit-wrapper {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    padding: 6px 12px;
    border-radius: var(--radius-pill);
    color: var(--text-secondary);
}

.limit-wrapper span {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.05em;
}

.limit-wrapper input {
    border: none;
    background: transparent;
    width: 55px; /* Slightly increased to account for padding */
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    outline: none;
    text-align: right;
    padding-right: 6px; /* Space between number and buttons */
    font-family: var(--font-sans);
}


.ghost-btn {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    padding: 10px 20px;
    border-radius: var(--radius-pill);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}
.ghost-btn:hover {
    border-color: var(--text-muted);
    color: var(--text-primary);
}

.primary-btn {
    background: var(--accent-blue);
    color: #ffffff;
    border: none;
    padding: 10px 24px;
    border-radius: var(--radius-pill);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: background 0.2s ease, opacity 0.2s ease;
}
.primary-btn:hover:not(:disabled) { background: var(--accent-blue-hover); }
.primary-btn:disabled { opacity: 0.6; cursor: not-allowed; }

/* ── Workspace Cards ── */
.workspace {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    flex: 1;
    min-height: 0; /* Allow inner panels to resize */
}
@media (max-width: 900px) { .workspace { grid-template-columns: 1fr; } }

.card-column { display: flex; flex-direction: column; gap: 1rem; }

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 0.5rem;
}

.card-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--text-secondary);
}

.header-actions { display: flex; align-items: center; gap: 1rem; }

.action-text {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    background: none;
    border: none;
    cursor: pointer;
    transition: opacity 0.2s;
}
.action-text:hover:not(:disabled) { opacity: 0.7; }
.action-text:disabled { opacity: 0.4; cursor: not-allowed; }
.text-blue { color: var(--accent-blue); }
.text-gray { color: var(--text-muted); }
.action-text input[type="file"] { display: none; }

.stats, .copy-msg { font-size: 0.75rem; font-weight: 500; color: var(--text-muted); }
.copy-msg { opacity: 0; transition: opacity 0.2s; transform: translateY(2px); }
.copy-msg.visible { opacity: 1; transform: translateY(0); color: var(--success); }
.copy-msg.error { color: var(--danger); }

.card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-card);
    flex: 1;
    display: flex;
    overflow: hidden;
    transition: border-color 0.2s ease;
}
.card:focus-within { border-color: var(--accent-blue); }

textarea {
    flex: 1;
    width: 100%;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.6;
    padding: 2rem;
    resize: none;
    outline: none;
}
textarea::placeholder { color: var(--text-muted); }

/* Overlay */
.drop-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: var(--header-blur);
    z-index: 100;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--accent-blue);
    border: 4px dashed var(--accent-blue);
}
.drop-overlay.active { display: flex; }

/* ── Footer ── */
.site-footer {
    padding: 0.75rem; /* Very compact footer */
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
    border-top: 1px solid var(--border-color);
    background: var(--bg-base);
}
.footer-heart { color: var(--danger); }