/* =========================================
   Variables & Theme Setup
   ========================================= */
:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #3b82f6;
    --light-bg: #f8fafc;
    --dark-bg: #0f172a;
    --sidebar-width: 320px;
    --sidebar-bg-light: #ffffff;
    --sidebar-bg-dark: #1e293b;
    --card-bg-light: #ffffff;
    --card-bg-dark: #1e293b;
    --text-main: #334155;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --border-radius-lg: 1.5rem;
    --border-radius-md: 1rem;
    --border-radius-sm: 0.5rem;
    --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);
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
    --transition-speed: 0.3s;
}

[data-theme="dark"] {
    --primary-color: #6366f1;
    --primary-hover: #818cf8;
    --light-bg: #0f172a;
    /* Main background is dark */
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --sidebar-bg-light: #1e293b;
    /* Actually dark in dark mode */
    --card-bg-light: #1e293b;
}

[data-theme="dark"] .btn-light,
[data-bs-theme="dark"] .btn-light {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--text-main);
    border-color: var(--border-color);
}

[data-theme="dark"] .btn-light:hover,
[data-bs-theme="dark"] .btn-light:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--text-main);
    border-color: var(--border-color);
}

[data-theme="dark"] .text-muted {
    color: var(--text-muted) !important;
}

[data-theme="dark"] ::placeholder,
[data-bs-theme="dark"] ::placeholder {
    color: var(--text-muted) !important;
    opacity: 1 !important;
}

/* Dark mode specific component overrides for better contrast */
[data-theme="dark"] .alert-success,
[data-bs-theme="dark"] .alert-success {
    background-color: rgba(16, 185, 129, 0.2) !important;
    border-color: rgba(16, 185, 129, 0.3) !important;
    color: #34d399 !important;
}

[data-theme="dark"] .alert-warning,
[data-bs-theme="dark"] .alert-warning {
    background-color: rgba(245, 158, 11, 0.2) !important;
    border-color: rgba(245, 158, 11, 0.3) !important;
    color: #fbbf24 !important;
}

[data-theme="dark"] .alert-danger,
[data-bs-theme="dark"] .alert-danger {
    background-color: rgba(239, 68, 68, 0.2) !important;
    border-color: rgba(239, 68, 68, 0.3) !important;
    color: #f87171 !important;
}

[data-theme="dark"] .form-check-label,
[data-theme="dark"] .form-label,
[data-bs-theme="dark"] .form-check-label,
[data-bs-theme="dark"] .form-label {
    color: var(--text-main) !important;
}

[data-theme="dark"] code {
    color: #818cf8 !important;
}

body {
    font-family: var(--font-family);
    background-color: var(--light-bg);
    color: var(--text-main);
    overflow-x: hidden;
    margin: 0;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

/* =========================================
   Layout Structure
   ========================================= */
.app-container {
    display: flex;
    min-height: 100vh;
    width: 100%;
    position: relative;
    overflow-x: hidden;
}

/* Sidebar Column */
.sidebar-column {
    width: var(--sidebar-width);
    background-color: var(--sidebar-bg-light);
    border-right: 1px solid var(--border-color);
    height: 100vh;
    position: sticky;
    top: 0;
    overflow-y: auto;
    z-index: 1000;
    transition: transform var(--transition-speed) ease, margin-left var(--transition-speed) ease, width var(--transition-speed) ease;
    flex-shrink: 0;
}

[data-theme="dark"] .sidebar-column {
    background-color: var(--sidebar-bg-dark);
}

.sidebar-content {
    height: 100%;
    overflow-y: auto;
    /* Hide scrollbar for cleaner look */
    scrollbar-width: thin;
}

/* Main Content Column */
.main-content-column {
    flex-grow: 1;
    min-width: 0;
    /* Prevent flex items from overflowing */
    background-color: var(--light-bg);
    transition: margin-left var(--transition-speed) ease;
    display: flex;
    flex-direction: column;
}

/* =========================================
   Responsive Sidebar Behavior
   ========================================= */

/* Mobile (Default or < 992px) */
@media (max-width: 991.98px) {
    .sidebar-column {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        transform: translateX(-100%);
        box-shadow: var(--shadow-lg);
        z-index: 1050;
        border-right: none;
    }

    .sidebar-column.open {
        transform: translateX(0);
    }

    .drawer-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100vw;
        height: 100vh;
        background-color: rgba(0, 0, 0, 0.5);
        z-index: 1040;
        opacity: 0;
        visibility: hidden;
        transition: opacity var(--transition-speed) ease, visibility var(--transition-speed) ease;
        backdrop-filter: blur(2px);
    }

    .drawer-overlay.open {
        opacity: 1;
        visibility: visible;
    }
}

/* Desktop (>= 992px) */
@media (min-width: 992px) {
    .sidebar-column {
        transform: none;
        /* Always visible by default */
        box-shadow: none;
        /* No shadow when inline */
    }

    /* Collapsed State on Desktop */
    .app-container.sidebar-collapsed .sidebar-column {
        margin-left: calc(var(--sidebar-width) * -1);
    }

    .drawer-overlay {
        display: none !important;
        /* Never show overlay on desktop */
    }
}


/* =========================================
   Component Components & Polish
   ========================================= */

/* Cards */
.card {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    background-color: var(--card-bg-light);
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    margin-bottom: 0;
    /* Remove default margin */
}

[data-theme="dark"] .card {
    background-color: var(--card-bg-dark);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    background-color: transparent;
    border-bottom: 1px solid var(--border-color);
    padding: 1.25rem 1.5rem;
}

.card-body {
    padding: 1.5rem;
}

.card.collapsed .card-body {
    display: none;
}

.card.fullscreen-mode {
    position: fixed !important;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 9999;
    border-radius: 0 !important;
    margin: 0 !important;
    display: flex;
    flex-direction: column;
}

.card.fullscreen-mode .card-body {
    flex: 1;
    overflow-y: auto;
}

body.fullscreen-active {
    overflow: hidden !important;
}

/* Header special card */
.header-card {
    background-color: var(--card-bg-light);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

[data-theme="dark"] .header-card {
    background-color: var(--card-bg-dark);
}

/* Typography & Icons */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 600;
    color: var(--text-main);
}

.text-primary {
    color: var(--primary-color) !important;
}

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

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

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

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

/* Form Elements */
.form-control,
.form-select {
    border-radius: var(--border-radius-md);
    border: 1px solid var(--border-color);
    background-color: transparent;
    color: var(--text-main);
    padding: 0.75rem 1rem;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.regex-delimiter {
    background-color: rgba(var(--primary-color), 0.05);
    color: var(--text-muted);
    font-weight: bold;
}

.regex-input {
    font-family: 'Fira Code', monospace;
    font-weight: 500;
}

.test-input {
    font-family: 'Fira Code', monospace;
    font-size: 0.9rem;
}

/* Tokens and Quick Patterns in Sidebar */
.token-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.5rem;
}

.token-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 0.25rem;
    font-family: 'Fira Code', monospace;
    font-size: 0.8rem;
    color: var(--text-main);
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
}

.token-btn:hover {
    background-color: rgba(79, 70, 229, 0.1);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.quick-pattern {
    border-radius: var(--border-radius-sm);
}

/* Highlight Output */
.highlighted-output {
    font-family: 'Fira Code', monospace;
    white-space: pre-wrap;
    line-height: 1.6;
    min-height: 100px;
    color: var(--text-main);
}

.match {
    background-color: rgba(255, 215, 0, 0.3);
    border-radius: 2px;
    box-shadow: 0 0 0 1px rgba(255, 215, 0, 0.5);
}

.match-group-1 {
    background-color: rgba(16, 185, 129, 0.2);
}

.match-group-2 {
    background-color: rgba(59, 130, 246, 0.2);
}

.match-group-3 {
    background-color: rgba(239, 68, 68, 0.2);
}

[data-theme="dark"] .match {
    background-color: rgba(255, 215, 0, 0.2);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

[data-theme="dark"] ::-webkit-scrollbar-thumb {
    background: #475569;
}

[data-theme="dark"] ::-webkit-scrollbar-thumb:hover {
    background: #64748b;
}

/* Horizontal Scroll Container (for mobile friendliness) */
.horizontal-scroll-container {
    display: flex;
    overflow-x: auto;
    gap: 0.5rem;
    padding-bottom: 0.5rem;
}

/* Utilities */
.bg-surface {
    background-color: var(--card-bg-light);
}

[data-theme="dark"] .bg-surface {
    background-color: var(--card-bg-dark);
}

.btn-text {
    background: none;
    border: none;
    padding: 0.5rem;
    color: var(--text-main);
    cursor: pointer;
    transition: color 0.2s;
}

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

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.fade-in {
    animation: fadeIn 0.3s ease-out forwards;
}