:root {
    --bg: #0a0a14;
    --bg-alt: #0f0f1f;
    --surface: rgba(20, 20, 42, 0.85);
    --surface-solid: #14142a;
    --surface-hover: rgba(28, 28, 58, 0.9);
    --border: rgba(42, 42, 74, 0.6);
    --border-light: rgba(58, 58, 90, 0.7);
    --text: #e0e0f0;
    --text-muted: #8888aa;
    --text-dim: #aaaacc;
    --accent: #00d4ff;
    --accent-hover: #00b8e6;
    --accent-bg: rgba(0, 212, 255, 0.08);
    --accent-glow: rgba(0, 212, 255, 0.2);
    --code-bg: #0a0a18;
    --code-text: #00ff88;
    --white: #f0f0ff;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 48px rgba(0, 0, 0, 0.4);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.light-theme {
    --bg: #f0f2f8;
    --bg-alt: #e8ecf4;
    --surface: rgba(255, 255, 255, 0.9);
    --surface-solid: #ffffff;
    --surface-hover: rgba(245, 247, 253, 0.95);
    --border: rgba(208, 213, 224, 0.7);
    --border-light: rgba(224, 228, 238, 0.8);
    --text: #1a1a2e;
    --text-muted: #667088;
    --text-dim: #555577;
    --accent: #0077b6;
    --accent-hover: #005f94;
    --accent-bg: rgba(0, 119, 182, 0.07);
    --accent-glow: rgba(0, 119, 182, 0.15);
    --code-bg: #f0f2f8;
    --code-text: #0077b6;
    --white: #1a1a2e;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 8px 48px rgba(0, 0, 0, 0.08);
}

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

body {
    font-family: 'Inter', 'Segoe UI', Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    transition: background var(--transition), color var(--transition);
    line-height: 1.6;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    background: radial-gradient(ellipse at 20% 50%, rgba(0, 212, 255, 0.03) 0%, transparent 50%),
                radial-gradient(ellipse at 80% 20%, rgba(0, 255, 136, 0.02) 0%, transparent 50%),
                radial-gradient(ellipse at 50% 80%, rgba(100, 50, 255, 0.02) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

/* Sidebar */
.sidebar {
    width: 220px;
    height: 100vh;
    background: var(--surface);
    position: fixed;
    left: 0;
    top: 0;
    padding: 24px 14px;
    display: flex;
    flex-direction: column;
    transition: background var(--transition);
    z-index: 100;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--accent) var(--surface);
}

.sidebar::-webkit-scrollbar { width: 6px; }
.sidebar::-webkit-scrollbar-track { background: var(--surface); border-radius: 3px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 3px; }
.sidebar::-webkit-scrollbar-thumb:hover { background: var(--accent-hover); }

.sidebar .logo { margin-bottom: 32px; text-align: center; }
.sidebar .logo img {
    width: 42px; height: 42px; border-radius: 50%; display: block; margin: 0 auto;
    border: 2px solid var(--accent); padding: 2px;
    transition: transform var(--transition), box-shadow var(--transition);
}
.sidebar .logo img:hover { transform: scale(1.08); box-shadow: 0 0 20px var(--accent-glow); }

.sidebar .nav-links { flex: 1; display: flex; flex-direction: column; gap: 1px; }
.sidebar a {
    display: flex; align-items: center; gap: 10px; color: var(--text-muted);
    text-decoration: none; padding: 9px 12px; border-radius: var(--radius-sm);
    transition: all var(--transition); font-size: 0.88em; font-weight: 500; position: relative;
}
.sidebar a:hover { color: var(--accent); background: var(--accent-bg); transform: translateX(2px); }
.sidebar a.active { color: var(--accent); background: var(--accent-bg); font-weight: 600; }

/* Main area */
.main-area {
    margin-left: 220px; width: calc(100% - 220px); min-height: 100vh;
    display: flex; flex-direction: column; position: relative; z-index: 1;
}

@keyframes fadeIn { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }
@keyframes slideUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
@keyframes slideIn { from { transform: translateX(100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }
@keyframes pulse { 0%,100% { transform: scale(1); box-shadow: 0 0 40px var(--accent-glow); } 50% { transform: scale(1.05); box-shadow: 0 0 80px var(--accent-glow), 0 0 120px var(--accent-glow); } }
@keyframes shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

/* Hero (index) */
.hero {
    flex: 1; display: flex; align-items: center; justify-content: center;
    gap: 40px; padding: 50px 16px 50px 10px; animation: slideUp 0.7s ease;
}
.hero-content { flex: 1; max-width: 500px; }
.hero-content h1 {
    font-size: 3.2em; font-weight: 800; margin-bottom: 16px; color: var(--white);
    transition: color var(--transition); letter-spacing: -0.5px; line-height: 1.15;
    background: linear-gradient(135deg, var(--white), var(--accent));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero-content p { line-height: 1.8; color: var(--text-dim); margin-bottom: 32px; max-width: 500px; font-size: 1.05em; }
.hero-content .btn {
    display: inline-block; padding: 14px 32px; background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    color: var(--bg); text-decoration: none; font-weight: 600; border-radius: var(--radius-sm);
    transition: all var(--transition); box-shadow: 0 4px 16px var(--accent-glow); font-size: 0.95em;
    position: relative; overflow: hidden;
}
.hero-content .btn::after {
    content: ''; position: absolute; inset: 0;
    background: linear-gradient(135deg, transparent 30%, rgba(255,255,255,0.15) 50%, transparent 70%);
    transform: translateX(-100%); transition: transform 0.6s;
}
.hero-content .btn:hover::after { transform: translateX(100%); }
.hero-content .btn:hover { transform: translateY(-2px); box-shadow: 0 8px 32px var(--accent-glow); }
.hero-avatar {
    width: 280px; height: 280px; border-radius: 50%; border: 3px solid var(--accent);
    display: flex; align-items: center; justify-content: center; font-size: 6em;
    background: var(--surface-solid); color: var(--accent); flex-shrink: 0;
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    box-shadow: 0 0 40px var(--accent-glow); overflow: hidden; animation: pulse 2s ease-in-out infinite;
}
.hero-avatar:hover { box-shadow: 0 0 80px var(--accent-glow); animation: none; transform: scale(1.1); }

/* Page header */
.page-header { text-align: left; padding: 30px 20px 14px; }
.page-header h1 { font-size: 2.2em; font-weight: 700; color: var(--white); letter-spacing: -0.3px; margin: 0; }
.page-header p { color: var(--text-muted); margin: 6px 0 0 0; font-size: 1em; }

/* Cards */
.project-card, .about-section, .contact-card, .admin-card, .chat-box, .api-bar, .auth-card {
    background: var(--surface); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
}

.projects-grid { padding: 10px 20px 30px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.project-search { padding: 0 20px; }
.project-search input {
    width: 100%; padding: 11px 16px; border: 1px solid var(--border); border-radius: var(--radius);
    background: var(--surface); color: var(--text); font-size: 0.9em; transition: all var(--transition);
    font-family: inherit; backdrop-filter: blur(12px);
}
.project-search input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 20px var(--accent-glow); }

.about-area { flex: 1; padding: 10px 20px 30px; }
.contact-container { padding: 10px 20px 30px; flex: 1; display: flex; flex-direction: column; align-items: flex-start; }
.contact-card { border-radius: var(--radius); padding: 28px; border: 1px solid var(--border); width: 100%; transition: all var(--transition); }
.contact-card:hover { border-color: var(--border-light); box-shadow: var(--shadow); }
.contact-card h3 { color: var(--accent); margin-bottom: 16px; font-weight: 600; font-size: 1em; }
.contact-item { display: flex; align-items: center; gap: 12px; padding: 12px 0; border-bottom: 1px solid var(--border); }
.contact-item:last-child { border-bottom: none; }
.contact-item .icon { width: 36px; height: 36px; border-radius: 50%; background: var(--accent-bg); display: flex; align-items: center; justify-content: center; font-size: 1em; flex-shrink: 0; }
.contact-item .info label { font-size: 0.75em; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; }
.contact-item .info span { display: block; color: var(--text); }

/* Footer */
.footer { padding: 24px 20px; color: var(--text-muted); font-size: 0.8em; border-top: 1px solid var(--border); text-align: center; }
.footer .footer-inner { max-width: 1000px; margin: 0 auto; display: flex; flex-direction: column; align-items: center; gap: 14px; }
.footer .footer-links { display: flex; gap: 18px; flex-wrap: wrap; justify-content: center; }
.footer .footer-links a { color: var(--text-muted); text-decoration: none; font-size: 0.85em; transition: color var(--transition); }
.footer .footer-links a:hover { color: var(--accent); }
.footer .footer-copy { font-size: 0.82em; color: var(--text-muted); }
.footer .footer-copy span { color: var(--accent); }

/* Pagination */
.pagination { display: flex; justify-content: center; gap: 4px; flex-wrap: wrap; padding: 12px 20px 8px; }
.pagination button { padding: 5px 12px; border: 1px solid var(--border); border-radius: 4px; background: var(--surface); color: var(--text-muted); cursor: pointer; font-size: 0.8em; transition: all var(--transition); }
.pagination button:hover { border-color: var(--accent); color: var(--accent); }
.pagination button.active { background: var(--accent); color: var(--bg); border-color: var(--accent); font-weight: 600; }

/* Page Loader */
.page-loader { position: fixed; top: 0; left: 0; right: 0; height: 3px; z-index: 9999; pointer-events: none; opacity: 0; transition: opacity 0.3s; }
.page-loader.show { opacity: 1; }
.page-loader .loader-bar { height: 100%; width: 0%; background: linear-gradient(90deg, var(--accent), #00ff88, var(--accent)); background-size: 200% 100%; animation: shimmer 1.5s infinite; border-radius: 0 2px 2px 0; }

/* Editor */
.editor-area { flex: 1; max-width: 1100px; margin: 0 auto; padding: 20px 40px 20px; width: 100%; display: flex; flex-direction: column; }
.editor-toolbar { display: flex; gap: 8px; margin-bottom: 10px; flex-wrap: wrap; align-items: center; }
.editor-toolbar button { padding: 7px 16px; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface); color: var(--text); font-size: 0.82em; cursor: pointer; transition: all var(--transition); font-family: inherit; }
.editor-toolbar button:hover { border-color: var(--accent); color: var(--accent); }
.editor-toolbar button.primary { background: linear-gradient(135deg, var(--accent), var(--accent-hover)); color: var(--bg); border-color: var(--accent); font-weight: 600; }
.editor-toolbar button.primary:hover { box-shadow: 0 4px 16px var(--accent-glow); }
.editor-toolbar .filename { color: var(--text-muted); font-size: 0.85em; display: flex; align-items: center; gap: 6px; margin-left: auto; }
.editor-toolbar .filename input { background: var(--surface); border: 1px solid var(--border); padding: 5px 8px; border-radius: 4px; color: var(--text); font-size: 0.85em; width: 140px; font-family: inherit; }
.editor-toolbar .filename input:focus { outline: none; border-color: var(--accent); }
.editor-wrap { position: relative; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; background: #08080f; }
.editor-wrap:focus-within { border-color: var(--accent); }
.editor-wrap .line-nums { position: absolute; left: 0; top: 0; bottom: 0; width: 42px; padding: 12px 0; background: #0a0a14; color: #3a3a5a; font-family: 'Consolas', monospace; font-size: 13px; line-height: 1.6; text-align: right; padding-right: 8px; user-select: none; overflow: hidden; pointer-events: none; }
.editor-wrap textarea { width: 100%; min-height: 400px; padding: 12px 14px 12px 52px; background: transparent; border: none; color: #e0e0f0; font-family: 'Consolas', monospace; font-size: 13px; line-height: 1.6; resize: vertical; tab-size: 2; outline: none; white-space: pre; overflow-x: auto; caret-color: var(--accent); }
.editor-wrap textarea::selection { background: rgba(0, 212, 255, 0.25); }
.templates-row { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 10px; }
.templates-row .chip { padding: 5px 12px; border: 1px solid var(--border); border-radius: 20px; font-size: 0.76em; background: var(--surface); color: var(--text-muted); cursor: pointer; transition: all var(--transition); }
.templates-row .chip:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-bg); }
.output-area { margin-top: 10px; padding: 10px 14px; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface); color: var(--text-dim); font-family: 'Consolas', monospace; font-size: 0.82em; min-height: 36px; }
.output-area.success { border-color: #00ff88; color: #00ff88; }
.output-area.error { border-color: #ff4444; color: #ff4444; }

/* Copy button */
.copy-btn { position: absolute; top: 6px; right: 6px; background: var(--surface-solid); border: 1px solid var(--border); color: var(--text-muted); padding: 3px 8px; border-radius: 4px; font-size: 0.7em; cursor: pointer; transition: all var(--transition); font-family: inherit; }
.copy-btn:hover { color: var(--accent); border-color: var(--accent); background: var(--accent-bg); }
.copy-btn.copied { color: var(--code-text); border-color: var(--code-text); }

/* Mobile */
@media (max-width: 1024px) {
    .hero { gap: 40px; padding: 60px 40px; }
    .hero-content h1 { font-size: 2.6em; }
    .hero-avatar { width: 220px; height: 220px; }
}
@media (max-width: 900px) {
    .sidebar { width: 200px; padding: 20px 12px; }
    .sidebar a { font-size: 0.83em; padding: 8px 10px; }
    .main-area { margin-left: 200px; width: calc(100% - 200px); }
}
@media (max-width: 768px) {
    body { flex-direction: column; }
    .sidebar { width: 100%; height: auto; position: relative; flex-direction: row; flex-wrap: wrap; align-items: center; padding: 10px 14px; gap: 4px; }
    .sidebar::before { display: none; }
    .sidebar .logo { margin-bottom: 0; margin-right: 10px; }
    .sidebar .logo img { width: 26px !important; height: 26px !important; border-width: 1.5px; }
    .sidebar .nav-links { display: flex; flex-direction: row; flex-wrap: wrap; gap: 3px; order: 3; width: 100%; margin-top: 6px; border-top: 1px solid var(--border); padding-top: 5px; }
    .sidebar .nav-links a { margin: 0; padding: 5px 10px; font-size: 0.78em; border-radius: 4px; white-space: nowrap; color: var(--text-muted); transition: all var(--transition); }
    .sidebar .nav-links a:hover { color: var(--accent); background: var(--accent-bg); }
    .sidebar .nav-links a.active { color: var(--accent); background: var(--accent-bg); font-weight: 600; }
    .sidebar a:hover { transform: none; }
    .main-area { margin-left: 0; width: 100%; }
    .hero { flex-direction: column; text-align: center; padding: 24px 12px; gap: 20px; }
    .hero-content p { max-width: 100%; font-size: 0.9em; }
    .hero-content h1 { font-size: 1.6em; }
    .hero-content .btn { padding: 10px 20px; font-size: 0.82em; }
    .hero-avatar { width: 110px; height: 110px; font-size: 2.5em; }
    .page-header { padding: 20px 12px 12px; }
    .page-header h1 { font-size: 1.3em; }
    .projects-grid { padding: 10px 12px 24px; gap: 8px; }
    .project-card { padding: 12px; }
    .about-area { padding: 10px 12px 24px; }
    .about-section { padding: 14px; }
    .contact-container { padding: 10px 12px 24px; }
    .editor-area { padding: 12px 16px; }
    .editor-toolbar .filename { margin-left: 0; width: 100%; }
    .editor-wrap textarea { min-height: 250px; font-size: 12px; }
    .pagination { padding: 10px 16px; gap: 2px; }
    .pagination button { padding: 4px 8px; font-size: 0.72em; }
    .api-bar { flex-direction: column; gap: 6px; }
    .chat-box { height: 260px !important; }
    .chat-box .msg { font-size: 0.8em; }
    .footer { padding: 18px 14px; }
}
@media (max-width: 480px) {
    .sidebar .nav-links a { font-size: 0.65em; padding: 4px 6px; }
    .hero-content h1 { font-size: 1.3em; }
    .hero-avatar { width: 100px; height: 100px; }
    .page-header h1 { font-size: 1.1em; }
}