/*
   AI REGEX GENERATOR - EXPERT WEB TOOLS
*/

@font-face { font-family: 'Inter';       src: url('/fonts/inter-v20-latin-regular.woff2') format('woff2'); font-weight: 400; font-display: swap; }
@font-face { font-family: 'Orbitron';    src: url('/fonts/orbitron-v35-latin-700.woff2')  format('woff2'); font-weight: 700; font-display: swap; }
@font-face { font-family: 'Roboto Mono'; src: url('/fonts/roboto-mono-v31-latin-regular.woff2') format('woff2'); font-weight: 400; font-display: swap; }

/* THEME VARIABLES - Dark (Default) */
:root {
    --bg-main:           #0a0a0f;
    --primary-accent:    #3b82f6;
    --secondary-accent:  #8b5cf6;
    --text-main:         #ffffff;
    --text-muted:        #94a3b8;
    --card-bg:           rgba(25, 25, 35, 0.6);
    --card-border:       rgba(255, 255, 255, 0.08);
    --input-bg:          rgba(255, 255, 255, 0.05);
    --highlight-bg:      rgba(59, 130, 246, 0.4);
    --btn-hover-bg:      rgba(255, 255, 255, 0.05);
    --explanation-bg:    rgba(139, 92, 246, 0.1);
    
    --font-heading:      'Orbitron', sans-serif;
    --font-body:         'Inter', sans-serif;
    --font-code:         'Roboto Mono', monospace;
}

/* Light Theme Overrides (Synchronized Architecture) */
html.light-theme {
    --bg-main:           #f8fafc;
    --primary-accent:    #2563eb;
    --secondary-accent:  #7c3aed;
    --text-main:         #0f172a;
    --text-muted:        #475569;
    --card-bg:           #ffffff;
    --card-border:       #cbd5e1;
    --input-bg:          #f1f5f9;
    --highlight-bg:      rgba(59, 130, 246, 0.25);
    --btn-hover-bg:      rgba(0, 0, 0, 0.05);
    --explanation-bg:    #f3e8ff;
}

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

/* STRICT ZERO HORIZONTAL SCROLL ENFORCEMENT */
html, body { width: 100%; max-width: 100vw; overflow-x: hidden; }

/* STRICT CHROMIUM BUG FIX: transition background-color only */
html, body { 
    background-color: var(--bg-main); 
    transition: background-color 0.2s ease; 
}

body {
    color: var(--text-main);
    font-family: var(--font-body);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* --- Skip link --- */
.sr-only {
    position: absolute; width: 1px; height: 1px;
    padding: 0; margin: -1px; overflow: hidden;
    clip: rect(0, 0, 0, 0); white-space: nowrap; border-width: 0;
}

.background-glow {
    position: fixed; top: -50%; left: -50%; width: 200%; height: 200%;
    background: radial-gradient(circle at center, rgba(139, 92, 246, 0.08) 0%, rgba(10, 10, 15, 0) 50%);
    z-index: -1; pointer-events: none; transition: background 0.3s;
}
html.light-theme .background-glow {
    background: radial-gradient(circle at center, rgba(139, 92, 246, 0.04) 0%, rgba(255, 255, 255, 0) 50%);
}

/* --- Header & Theme Toggle --- */
.tool-header {
    display: flex; justify-content: space-between; align-items: center;
    padding: 1.5rem 5%; max-width: 1400px; margin: 0 auto; width: 100%;
}
.back-btn {
    color: var(--text-muted); text-decoration: none; display: flex; align-items: center;
    gap: 8px; transition: color 0.3s; border-radius: 4px; padding: 10px;
}
.back-btn:hover, .back-btn:focus-visible { color: var(--primary-accent); outline: none; }

.logo { font-family: var(--font-heading); font-size: 1.2rem; flex: 1; text-align: center; }
.logo span { color: var(--secondary-accent); }

/* Sync'd Theme Toggle Button */
.theme-toggle-btn { 
    background: var(--input-bg); border: 1px solid var(--card-border); 
    color: var(--text-main); width: 36px; height: 36px; border-radius: 8px; 
    cursor: pointer; display: flex; align-items: center; justify-content: center; 
    transition: all 0.2s ease;
}
.theme-toggle-btn:hover { border-color: var(--primary-accent); color: var(--primary-accent); }

/* --- Main Content --- */
.main-content {
    flex-grow: 1; padding: 2rem 5%;
    max-width: 900px; margin: 0 auto; width: 100%;
}
.tool-intro { text-align: center; margin-bottom: 2rem; }
.tool-intro h1 { font-family: var(--font-heading); margin-bottom: 0.5rem; font-size: 2rem; line-height: 1.2; }
.tool-intro p { color: var(--text-muted); }

/* --- Mode Toggle --- */
.mode-toggle { display: flex; background: var(--input-bg); padding: 4px; border-radius: 8px; }
.mode-btn {
    flex: 1; background: transparent; border: none; color: var(--text-muted);
    padding: 12px; border-radius: 6px; cursor: pointer; font-weight: 600;
    transition: all 0.2s; font-size: 0.95rem; display: flex; align-items: center; justify-content: center; gap: 8px;
}
.mode-btn.active { background: var(--primary-accent); color: #fff; }
.mode-btn:hover:not(.active) { color: var(--text-main); background: var(--btn-hover-bg); }

/* --- Cards --- */
.card {
    background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 16px;
    padding: 1.5rem; margin-bottom: 1.5rem; backdrop-filter: blur(10px); width: 100%; min-width: 0;
}
.card-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1rem; flex-wrap: wrap; gap: 10px; }
.card h2 { font-family: var(--font-heading); font-size: 1.1rem; color: var(--text-muted); display: flex; align-items: center; gap: 10px; margin: 0; }
.card h2 i { color: var(--primary-accent); }

.engine-badge {
    background: rgba(59, 130, 246, 0.15); color: var(--primary-accent);
    padding: 4px 12px; border-radius: 6px; font-size: 0.8rem; font-weight: bold;
    border: 1px solid rgba(59, 130, 246, 0.3); font-family: var(--font-code);
}

/* --- Inputs --- */
textarea, input[type="text"], select {
    width: 100%; background: var(--input-bg); border: 1px solid var(--card-border);
    border-radius: 8px; padding: 12px; color: var(--text-main); font-family: var(--font-code);
    font-size: 1rem; outline: none; resize: none; transition: border-color 0.2s;
}
textarea { font-family: var(--font-body); }
textarea:focus, input:focus, select:focus { border-color: var(--primary-accent); }
select { cursor: pointer; font-family: var(--font-body); font-weight: 600; }
select option { background: var(--bg-main); color: var(--text-main); }
html.light-theme select option { background: #ffffff; color: #0f172a; }

/* --- Example Prompts --- */
.example-prompts { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 1.5rem; }
.example-btn {
    background: transparent; border: 1px solid var(--card-border); color: var(--text-muted);
    padding: 8px 14px; border-radius: 20px; cursor: pointer; font-size: 0.85rem; transition: all 0.2s;
}
.example-btn:hover { border-color: var(--primary-accent); color: var(--text-main); background: var(--btn-hover-bg); }

/* --- Advanced Options --- */
.advanced-controls { margin: 1rem 0; }
.toggle-btn {
    background: transparent; border: none; color: var(--text-muted); cursor: pointer;
    font-size: 0.9rem; display: flex; align-items: center; gap: 8px; padding: 10px 0;
}
.toggle-btn i { transition: transform 0.3s ease; }
.toggle-btn[aria-expanded="true"] i { transform: rotate(180deg); }
.toggle-btn:hover { color: var(--text-main); }

.advanced-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 0.5rem; }
.checkbox-wrapper { grid-column: span 2; display: flex; align-items: center; gap: 10px; color: var(--text-muted); font-size: 0.9rem; }
.checkbox-wrapper input { accent-color: var(--primary-accent); cursor: pointer; width: 18px; height: 18px; }

.auto-escape-wrapper { display: flex; gap: 1rem; margin-bottom: 1.5rem; flex-wrap: wrap; padding: 12px; background: var(--input-bg); border-radius: 8px; }
.auto-escape-wrapper label { display: flex; align-items: center; gap: 8px; color: var(--text-muted); font-size: 0.9rem; cursor: pointer; }
.auto-escape-wrapper input { accent-color: var(--secondary-accent); width: 18px; height: 18px; cursor: pointer; }

/* --- Primary Button --- */
.primary-btn {
    width: 100%; background: var(--primary-accent); color: #fff; border: none;
    padding: 14px; border-radius: 8px; font-weight: 600; cursor: pointer;
    font-size: 1rem; transition: background 0.2s; display: flex; justify-content: center; align-items: center; gap: 8px;
}
.primary-btn:hover:not(:disabled) { background: #2563eb; }
.primary-btn:disabled { background: #4b5563; cursor: not-allowed; opacity: 0.7; }

/* --- Output Area --- */
.output-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1rem; flex-wrap: wrap; gap: 10px;}
.output-actions { display: flex; gap: 8px; }

.regex-display {
    display: flex; background: var(--input-bg); border: 1px solid var(--card-border);
    border-radius: 8px; padding: 15px; align-items: center; gap: 10px;
    margin-bottom: 1.5rem; min-width: 0;
}
.regex-display code {
    flex: 1; font-family: var(--font-code); font-size: 1.1rem; line-height: 1.4;
    color: #a5f3fc; white-space: pre-wrap; word-break: break-all; overflow-wrap: anywhere;
}
html.light-theme .regex-display code { color: #0369a1; }

.icon-btn {
    background: var(--input-bg); border: 1px solid var(--card-border); color: var(--text-main);
    padding: 8px 12px; border-radius: 6px; cursor: pointer; font-size: 0.85rem; font-family: var(--font-body);
    display: flex; align-items: center; gap: 5px; transition: all 0.2s; text-decoration: none; white-space: nowrap;
}
.icon-btn:hover { color: var(--primary-accent); border-color: var(--primary-accent); background: var(--btn-hover-bg); }

/* --- Code Exports --- */
.code-export-container { border: 1px solid var(--card-border); border-radius: 8px; overflow: hidden; margin-bottom: 1.5rem; }
.code-tabs { display: flex; background: var(--card-bg); border-bottom: 1px solid var(--card-border); overflow-x: auto; scrollbar-width: none; }
.code-tab-btn {
    background: transparent; border: none; color: var(--text-muted);
    padding: 12px 15px; cursor: pointer; font-size: 0.85rem; font-weight: 600;
    transition: all 0.2s; border-bottom: 2px solid transparent; white-space: nowrap;
}
.code-tab-btn:hover { color: var(--text-main); background: var(--btn-hover-bg); }
.code-tab-btn.active { color: var(--primary-accent); border-bottom-color: var(--primary-accent); background: var(--input-bg); }

.code-panels { background: var(--input-bg); padding: 15px; }
.code-panel {
    margin: 0; font-family: var(--font-code); font-size: 0.85rem; color: var(--text-main);
    white-space: pre-wrap; word-break: break-all; overflow-wrap: anywhere;
}

/* --- Explanation Box --- */
.explanation-box { margin-top: 1.5rem; background: var(--explanation-bg); border-left: 4px solid var(--secondary-accent); padding: 15px; border-radius: 8px; }
.explanation-box h3 { color: var(--secondary-accent); font-size: 1rem; margin-bottom: 8px; display: flex; align-items: center; gap: 8px; }
.explanation-box p  { color: var(--text-main); font-size: 0.95rem; line-height: 1.6; white-space: pre-wrap; font-family: var(--font-body); }

/* --- Live Tester --- */
.tester-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1rem; flex-wrap: wrap; gap: 10px; }
.badge { font-size: 0.8rem; background: var(--highlight-bg); padding: 4px 8px; border-radius: 4px; color: var(--text-main); }
.tester-hint { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 10px; font-style: italic; }
.tester-hint i { color: var(--secondary-accent); margin-right: 5px; }

.tester-warning {
    font-size: 0.85rem; color: #fca5a5; background: rgba(239, 68, 68, 0.1); padding: 12px;
    border-radius: 6px; margin-bottom: 1rem; line-height: 1.4; display: flex; align-items: flex-start; gap: 8px;
}
html.light-theme .tester-warning { color: #b91c1c; }

.tester-wrapper { position: relative; width: 100%; height: 220px; border: 1px solid var(--card-border); border-radius: 8px; background: var(--input-bg); }
.tester-layer {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%; padding: 12px; font-family: var(--font-code);
    font-size: 1rem; line-height: 1.5; white-space: pre-wrap; word-break: break-all; overflow-wrap: anywhere;
    border: none; background: transparent; overflow: auto;
}
.output-layer { color: transparent; z-index: 1; pointer-events: none; }
.input-layer  { color: var(--text-main); z-index: 2; caret-color: var(--primary-accent); outline: none; resize: none; }

mark { background-color: var(--highlight-bg); color: transparent; border-radius: 2px; }

/* --- Capture Groups Panel --- */
.capture-groups-container { margin-top: 1.5rem; }
.capture-groups-container h3 { font-size: 0.95rem; margin-bottom: 0.75rem; color: var(--text-muted); display: flex; align-items: center; gap: 8px; }
.capture-groups-container ul { list-style: none; display: flex; flex-direction: column; gap: 8px; max-height: 200px; overflow-y: auto; }
.capture-groups-container li { 
    background: var(--input-bg); padding: 10px; border-radius: 6px; font-size: 0.85rem; 
    font-family: var(--font-code); border: 1px solid var(--card-border); word-break: break-all; 
}
.cap-num { color: var(--secondary-accent); font-weight: bold; margin-right: 5px; }

/* --- Error & Toast --- */
.error-msg { margin-top: 1rem; padding: 10px; background: rgba(239, 68, 68, 0.1); color: #f87171; border-radius: 6px; text-align: center; font-size: 0.9rem; }
html.light-theme .error-msg { color: #b91c1c; }

.toast {
    position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%); background: #1e1e24; border: 1px solid var(--primary-accent);
    color: #fff; padding: 10px 20px; border-radius: 8px; z-index: 2000; box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    transition: opacity 0.3s; font-size: 0.9rem; pointer-events: none; white-space: nowrap;
}
html.light-theme .toast { background: #ffffff; color: #0f172a; border-color: var(--primary-accent); }

.hidden { display: none !important; }
.mt-1 { margin-top: 1rem; }
.mb-1 { margin-bottom: 1.5rem; }

/* --- Info / FAQ Section --- */
.info-section { margin-top: 4rem; padding: 0 1rem; width: 100%; }
.info-section h2 { font-family: var(--font-heading); color: var(--text-main); margin-bottom: 2rem; font-size: 1.5rem; text-align: center; }
.info-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 2rem; margin-bottom: 3rem; }
.info-grid h3 { color: var(--primary-accent); font-family: var(--font-heading); font-size: 1.1rem; margin-bottom: 0.75rem; }
.info-grid p { color: var(--text-muted); font-size: 0.95rem; line-height: 1.6; }
.info-grid code, .faq-container code { background: var(--input-bg); padding: 2px 6px; border-radius: 4px; font-family: var(--font-code); color: var(--secondary-accent); border: 1px solid var(--card-border); }

.faq-container { margin-top: 2rem; max-width: 800px; margin-left: auto; margin-right: auto; }
.faq-container h3 { font-family: var(--font-heading); color: var(--text-main); margin: 2rem 0 1.5rem; text-align: center; font-size: 1.3rem;}
.faq-container h4 { color: var(--secondary-accent); font-size: 1.05rem; margin-bottom: 0.5rem; margin-top: 2rem; }
.faq-container p { color: var(--text-muted); font-size: 0.95rem; margin-bottom: 1rem; line-height: 1.7; }

/* --- Footer --- */
footer { text-align: center; padding: 3rem 0; color: var(--text-muted); font-size: 0.9rem; border-top: 1px solid var(--card-border); margin-top: 3rem; }
footer a { color: var(--text-main); text-decoration: none; }
footer a:hover { color: var(--primary-accent); }

/* --- Mobile Breakpoints --- */
@media (max-width: 600px) {
    .advanced-grid    { grid-template-columns: 1fr; }
    .checkbox-wrapper { grid-column: span 1; }
    .info-grid        { grid-template-columns: 1fr; }
    .card             { padding: 1.25rem; }
    .mode-toggle      { flex-direction: column; gap: 4px; }
}

@media (max-width: 480px) {
    .main-content     { padding: 1.5rem 4%; }
    .tool-header      { padding: 1rem 4%; }
    .tool-intro h1    { font-size: 1.4rem; }
    .example-prompts  { gap: 8px; }
    .auto-escape-wrapper { flex-direction: column; gap: 0.75rem; }
}

@media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; } }