/* ========================================
   CSS Custom Properties
   ======================================== */

:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f5f7fa;
    --bg-sidebar: #1e293b;
    --bg-sidebar-hover: rgba(255, 255, 255, 0.05);
    --bg-sidebar-active: rgba(255, 255, 255, 0.1);
    --text-primary: #1a1a2e;
    --text-secondary: #64748b;
    --text-sidebar: #94a3b8;
    --text-sidebar-active: #e2e8f0;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --border: #e2e8f0;
    --code-bg: #f1f5f9;
    --success: #22c55e;
    --error: #ef4444;
    --warning: #f59e0b;
    --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    --radius: 8px;
    --radius-sm: 4px;
    --sidebar-width: 220px;
    --header-height: 56px;
}

:root.dark {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-sidebar: #0c1222;
    --bg-sidebar-hover: rgba(255, 255, 255, 0.05);
    --bg-sidebar-active: rgba(255, 255, 255, 0.1);
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --border: #334155;
    --code-bg: #1e293b;
}

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

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

body {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    grid-template-rows: var(--header-height) 1fr;
    height: 100vh;
    margin: 0;
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    overflow: hidden;
}

/* ========================================
   Sidebar
   ======================================== */

.sidebar {
    grid-row: 1 / -1;
    background: var(--bg-sidebar);
    color: var(--text-sidebar);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    border-right: 1px solid rgba(0, 0, 0, 0.2);
}

.sidebar-header {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.sidebar-logo {
    font-size: 1.25rem;
}

.sidebar-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-sidebar-active);
    letter-spacing: -0.01em;
}

#sidebar-nav {
    flex: 1;
    padding: 0.5rem 0;
}

.sidebar-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.625rem 1.25rem;
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
    border-left: 3px solid transparent;
    font-size: 0.875rem;
    user-select: none;
}

.sidebar-item:hover {
    background: var(--bg-sidebar-hover);
    color: var(--text-sidebar-active);
}

.sidebar-item.active {
    background: var(--bg-sidebar-active);
    border-left-color: var(--accent);
    color: var(--text-sidebar-active);
}

.sidebar-icon {
    width: 1.5rem;
    text-align: center;
    font-size: 0.9rem;
    flex-shrink: 0;
    opacity: 0.8;
}

.sidebar-item.active .sidebar-icon {
    opacity: 1;
}

/* ========================================
   Header
   ======================================== */

.header {
    grid-column: 2;
    padding: 0 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-primary);
}

.header h1 {
    font-size: 1.05rem;
    font-weight: 600;
    margin: 0;
    letter-spacing: -0.01em;
}

.theme-toggle {
    background: none;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    padding: 0.375rem 0.625rem;
    font-size: 1.1rem;
    color: var(--text-secondary);
    transition: background 0.15s, color 0.15s;
    line-height: 1;
}

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

/* ========================================
   Content Area
   ======================================== */

#content-area {
    grid-column: 2;
    padding: 1.5rem;
    overflow-y: auto;
}

.module-container {
    height: 100%;
    display: flex;
    flex-direction: column;
}

/* ========================================
   Shared Tool Components
   ======================================== */

.tool-textarea {
    width: 100%;
    min-height: 180px;
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    line-height: 1.6;
    padding: 0.875rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-secondary);
    color: var(--text-primary);
    resize: vertical;
    outline: none;
    transition: border-color 0.15s;
}

.tool-textarea:focus {
    border-color: var(--accent);
}

.tool-textarea::placeholder {
    color: var(--text-secondary);
    opacity: 0.7;
}

.tool-output {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    line-height: 1.6;
    padding: 0.875rem;
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: auto;
    white-space: pre-wrap;
    word-break: break-all;
}

.tool-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.tool-row {
    display: flex;
    gap: 1rem;
    align-items: stretch;
}

.tool-col {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.tool-col .tool-textarea,
.tool-col .tool-output {
    flex: 1;
}

/* ========================================
   Buttons
   ======================================== */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.5rem 1rem;
    font-size: 0.8125rem;
    font-weight: 500;
    font-family: var(--font-sans);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.15s;
    background: var(--bg-primary);
    color: var(--text-primary);
    white-space: nowrap;
}

.btn:hover {
    background: var(--bg-secondary);
}

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

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

.btn-sm {
    padding: 0.3rem 0.625rem;
    font-size: 0.75rem;
}

/* ========================================
   Toolbar
   ======================================== */

.toolbar {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
    flex-wrap: wrap;
}

.toolbar-separator {
    width: 1px;
    height: 1.25rem;
    background: var(--border);
    margin: 0 0.25rem;
}

/* ========================================
   Stats Grid
   ======================================== */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 0.75rem;
    margin-top: 0.75rem;
}

.stat-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.875rem;
    text-align: center;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.stat-label {
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

/* ========================================
   JSON Syntax Highlighting
   ======================================== */

.json-key { color: #9333ea; }
.json-string { color: #16a34a; }
.json-number { color: #2563eb; }
.json-bool { color: #ea580c; }
.json-null { color: #64748b; }

:root.dark .json-key { color: #c084fc; }
:root.dark .json-string { color: #4ade80; }
:root.dark .json-number { color: #60a5fa; }
:root.dark .json-bool { color: #fb923c; }
:root.dark .json-null { color: #94a3b8; }

/* ========================================
   Status Messages
   ======================================== */

.status {
    font-size: 0.8125rem;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    margin-top: 0.5rem;
}

.status-success {
    background: color-mix(in srgb, var(--success) 12%, transparent);
    color: var(--success);
}

.status-error {
    background: color-mix(in srgb, var(--error) 12%, transparent);
    color: var(--error);
}

/* ========================================
   Unicode Badge
   ======================================== */

.char-badge {
    display: inline-block;
    background: color-mix(in srgb, var(--error) 15%, transparent);
    border: 1px solid color-mix(in srgb, var(--error) 30%, transparent);
    color: var(--error);
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    padding: 0.1rem 0.35rem;
    border-radius: var(--radius-sm);
    vertical-align: baseline;
    cursor: help;
    font-weight: 500;
}

/* ========================================
   Password Generator
   ======================================== */

.password-display {
    font-family: var(--font-mono);
    font-size: 1.125rem;
    padding: 1rem;
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    word-break: break-all;
    letter-spacing: 0.02em;
    min-height: 3.5rem;
    display: flex;
    align-items: center;
}

.strength-bar {
    height: 6px;
    border-radius: 3px;
    background: var(--border);
    overflow: hidden;
    margin-top: 0.5rem;
}

.strength-fill {
    height: 100%;
    border-radius: 3px;
    transition: width 0.3s, background-color 0.3s;
}

.strength-label {
    font-size: 0.75rem;
    font-weight: 600;
    margin-top: 0.25rem;
}

.config-group {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
    margin: 0.75rem 0;
}

.config-group label {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.8125rem;
    cursor: pointer;
    user-select: none;
}

.config-group input[type="checkbox"] {
    accent-color: var(--accent);
}

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

.range-group input[type="range"] {
    flex: 1;
    accent-color: var(--accent);
}

.range-group input[type="number"] {
    width: 4rem;
    padding: 0.3rem 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
    color: var(--text-primary);
    text-align: center;
}

/* ========================================
   Select
   ======================================== */

.tool-select {
    padding: 0.3rem 0.5rem;
    font-size: 0.75rem;
    font-family: var(--font-sans);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-primary);
    color: var(--text-primary);
    cursor: pointer;
}

/* ========================================
   Base64 File Drop
   ======================================== */

.file-drop {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s;
}

.file-drop:hover,
.file-drop.dragover {
    border-color: var(--accent);
    background: color-mix(in srgb, var(--accent) 5%, transparent);
}

/* ========================================
   Copy Feedback
   ======================================== */

.copy-feedback {
    font-size: 0.75rem;
    color: var(--success);
    opacity: 0;
    transition: opacity 0.2s;
}

.copy-feedback.show {
    opacity: 1;
}

/* ========================================
   Tab Switch (used in base64)
   ======================================== */

.tab-bar {
    display: flex;
    gap: 0;
    margin-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
}

.tab-btn {
    padding: 0.5rem 1rem;
    font-size: 0.8125rem;
    font-weight: 500;
    font-family: var(--font-sans);
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: color 0.15s, border-color 0.15s;
}

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

.tab-btn.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

/* ========================================
   Scrollbar styling
   ======================================== */

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}