/* ============================================
   TC Analyzer — Styles
   Modern glassmorphism + gradient dark theme
   ============================================ */

/* ---------- CSS Variables ---------- */
:root {
    /* Dark Theme (default) */
    --bg-primary: #0a0a1a;
    --bg-secondary: #12122a;
    --bg-card: rgba(20, 20, 50, 0.7);
    --bg-card-hover: rgba(30, 30, 70, 0.8);
    --bg-input: rgba(15, 15, 40, 0.9);
    --border-color: rgba(100, 100, 255, 0.15);
    --border-hover: rgba(100, 100, 255, 0.3);
    --text-primary: #e8e8f0;
    --text-secondary: #9898b8;
    --text-muted: #6868a0;
    --accent-1: #6c5ce7;
    --accent-2: #a29bfe;
    --accent-3: #fd79a8;
    --accent-4: #00cec9;
    --gradient-primary: linear-gradient(135deg, #6c5ce7 0%, #a29bfe 50%, #fd79a8 100%);
    --gradient-accent: linear-gradient(135deg, #00cec9, #6c5ce7);
    --gradient-warm: linear-gradient(135deg, #fd79a8, #f8a5c2);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px rgba(108, 92, 231, 0.2);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme */
[data-theme="light"] {
    --bg-primary: #f0f0f8;
    --bg-secondary: #e8e8f4;
    --bg-card: rgba(255, 255, 255, 0.85);
    --bg-card-hover: rgba(255, 255, 255, 0.95);
    --bg-input: rgba(255, 255, 255, 0.95);
    --border-color: rgba(100, 100, 200, 0.2);
    --border-hover: rgba(100, 100, 200, 0.4);
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a6a;
    --text-muted: #8080a0;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.12);
    --shadow-glow: 0 0 30px rgba(108, 92, 231, 0.1);
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    transition: var(--transition);
}

/* ---------- Particle Canvas ---------- */
#particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    opacity: 0.4;
}

[data-theme="light"] #particles {
    opacity: 0.2;
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
    background: var(--accent-1);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover { background: var(--accent-2); }

/* ---------- Header ---------- */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 32px;
    background: rgba(10, 10, 26, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
}

[data-theme="light"] .header {
    background: rgba(240, 240, 248, 0.85);
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.4rem;
    font-weight: 800;
    user-select: none;
}

.logo-icon {
    font-size: 1.6rem;
    filter: drop-shadow(0 0 8px rgba(108, 92, 231, 0.5));
}

.logo-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-accent {
    font-weight: 400;
}

.header-nav {
    display: flex;
    gap: 4px;
    background: var(--bg-input);
    border-radius: var(--radius-xl);
    padding: 4px;
    border: 1px solid var(--border-color);
}

.nav-btn {
    padding: 8px 20px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 500;
    border-radius: var(--radius-xl);
    cursor: pointer;
    transition: var(--transition);
}

.nav-btn:hover {
    color: var(--text-primary);
    background: rgba(108, 92, 231, 0.1);
}

.nav-btn.active {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 2px 12px rgba(108, 92, 231, 0.4);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.theme-toggle {
    width: 38px;
    height: 38px;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    background: var(--bg-card);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    font-size: 1.1rem;
}

.theme-toggle:hover {
    border-color: var(--border-hover);
    transform: rotate(20deg);
    box-shadow: var(--shadow-glow);
}

.query-counter {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
    padding: 6px 14px;
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
}

#queryCount {
    color: var(--accent-4);
    font-weight: 700;
}

/* ---------- Main Content ---------- */
.main-content {
    position: relative;
    z-index: 1;
    max-width: 1400px;
    margin: 0 auto;
    padding: 32px;
}

.tab-content {
    display: none;
    animation: fadeIn 0.4s ease;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ---------- Hero ---------- */
.hero {
    text-align: center;
    margin-bottom: 40px;
}

.hero-title {
    font-size: 2.6rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.6;
    max-width: 600px;
    margin: 0 auto;
}

/* ---------- Analyzer Grid ---------- */
.analyzer-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    align-items: start;
}

@media (max-width: 1024px) {
    .analyzer-grid {
        grid-template-columns: 1fr;
    }
}

/* ---------- Panel ---------- */
.panel {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.panel:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.02);
}

.panel-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.95rem;
    font-weight: 600;
}

.panel-icon {
    font-size: 1.1rem;
}

.panel-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ---------- Language Select ---------- */
.language-select {
    padding: 6px 12px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.8rem;
    cursor: pointer;
    outline: none;
    transition: var(--transition);
}

.language-select:hover,
.language-select:focus {
    border-color: var(--accent-1);
}

.language-select option {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

/* ---------- Icon Button ---------- */
.icon-btn {
    width: 32px;
    height: 32px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.icon-btn:hover {
    color: var(--text-primary);
    border-color: var(--accent-1);
    background: rgba(108, 92, 231, 0.1);
}

/* ---------- Code Editor ---------- */
.code-editor-wrapper {
    display: flex;
    min-height: 350px;
    max-height: 500px;
    overflow: auto;
}

.line-numbers {
    padding: 16px 12px;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    line-height: 1.6;
    color: var(--text-muted);
    text-align: right;
    user-select: none;
    min-width: 45px;
    background: rgba(0, 0, 0, 0.15);
    border-right: 1px solid var(--border-color);
    white-space: pre-line;
}

[data-theme="light"] .line-numbers {
    background: rgba(0, 0, 0, 0.04);
}

.code-editor {
    flex: 1;
    padding: 16px;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.6;
    resize: none;
    outline: none;
    tab-size: 4;
    white-space: pre;
    overflow-wrap: normal;
    overflow-x: auto;
}

.code-editor::placeholder {
    color: var(--text-muted);
    opacity: 0.6;
}

/* ---------- Panel Footer ---------- */
.panel-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    border-top: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.02);
}

.char-count {
    font-size: 0.78rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

/* ---------- Analyze Button ---------- */
.analyze-btn {
    padding: 10px 24px;
    background: var(--gradient-primary);
    border: none;
    border-radius: var(--radius-xl);
    color: white;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(108, 92, 231, 0.4);
    position: relative;
    overflow: hidden;
}

.analyze-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(108, 92, 231, 0.5);
}

.analyze-btn:active {
    transform: translateY(0);
}

.analyze-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-content, .btn-loading {
    display: flex;
    align-items: center;
    gap: 8px;
}

.spinner {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ---------- Results Panel ---------- */
.results-body {
    padding: 24px;
    min-height: 350px;
    max-height: 520px;
    overflow-y: auto;
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 40px 20px;
    min-height: 300px;
}

.empty-icon {
    font-size: 3rem;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 1.2rem;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.empty-state p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    max-width: 320px;
    line-height: 1.5;
}

.empty-features {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 24px;
    justify-content: center;
}

.feature-chip {
    padding: 6px 14px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    font-size: 0.78rem;
    color: var(--text-secondary);
}

/* ---------- Result Card Styles ---------- */
.result-complexity {
    text-align: center;
    margin-bottom: 24px;
    padding: 24px;
    background: rgba(108, 92, 231, 0.08);
    border: 1px solid rgba(108, 92, 231, 0.2);
    border-radius: var(--radius-md);
}

.complexity-label {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.complexity-value {
    font-family: var(--font-mono);
    font-size: 2.4rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.complexity-badge {
    display: inline-block;
    margin-top: 10px;
    padding: 4px 16px;
    border-radius: var(--radius-xl);
    font-size: 0.78rem;
    font-weight: 600;
}

.badge-excellent {
    background: rgba(0, 206, 201, 0.15);
    color: #00cec9;
    border: 1px solid rgba(0, 206, 201, 0.3);
}

.badge-good {
    background: rgba(85, 239, 196, 0.15);
    color: #55efc4;
    border: 1px solid rgba(85, 239, 196, 0.3);
}

.badge-fair {
    background: rgba(253, 203, 110, 0.15);
    color: #fdcb6e;
    border: 1px solid rgba(253, 203, 110, 0.3);
}

.badge-poor {
    background: rgba(255, 118, 117, 0.15);
    color: #ff7675;
    border: 1px solid rgba(255, 118, 117, 0.3);
}

.badge-bad {
    background: rgba(253, 121, 168, 0.15);
    color: #fd79a8;
    border: 1px solid rgba(253, 121, 168, 0.3);
}

.result-details {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
}

.detail-card {
    flex: 1;
    padding: 16px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    text-align: center;
}

.detail-label {
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.detail-value {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--accent-2);
}

.result-section {
    margin-bottom: 18px;
}

.result-section-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.88rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-primary);
    padding-bottom: 6px;
    border-bottom: 1px solid var(--border-color);
}

.result-section-content {
    font-size: 0.86rem;
    line-height: 1.7;
    color: var(--text-secondary);
}

.result-section-content ul {
    list-style: none;
    padding: 0;
}

.result-section-content li {
    padding: 4px 0;
    padding-left: 20px;
    position: relative;
}

.result-section-content li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--accent-1);
    font-weight: 700;
}

.optimization-tip {
    padding: 12px 16px;
    background: rgba(0, 206, 201, 0.06);
    border-left: 3px solid var(--accent-4);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin-top: 8px;
    font-size: 0.84rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ---------- History Section ---------- */
.history-section {
    margin-top: 48px;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}

.section-header.centered {
    flex-direction: column;
    text-align: center;
    gap: 8px;
    margin-bottom: 32px;
}

.section-header h2 {
    font-size: 1.4rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.section-icon {
    font-size: 1.3rem;
}

.text-btn {
    padding: 6px 14px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-family: var(--font-sans);
    font-size: 0.8rem;
    cursor: pointer;
    transition: var(--transition);
}

.text-btn:hover {
    color: var(--accent-3);
    border-color: var(--accent-3);
}

.history-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 16px;
}

.history-card {
    padding: 16px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
}

.history-card:hover {
    border-color: var(--border-hover);
    background: var(--bg-card-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.history-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 10px;
}

.history-complexity {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 1.1rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.history-lang {
    font-size: 0.72rem;
    font-weight: 600;
    padding: 3px 10px;
    background: rgba(108, 92, 231, 0.1);
    color: var(--accent-2);
    border-radius: var(--radius-xl);
    text-transform: uppercase;
}

.history-preview {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    line-height: 1.5;
    max-height: 60px;
    overflow: hidden;
    white-space: pre;
    text-overflow: ellipsis;
}

.history-time {
    font-size: 0.72rem;
    color: var(--text-muted);
    margin-top: 10px;
}

/* ---------- Examples Grid ---------- */
.examples-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 16px;
}

.example-card {
    padding: 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.example-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: var(--transition);
}

.example-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.example-card:hover::before {
    opacity: 1;
}

.example-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 10px;
}

.example-name {
    font-size: 1rem;
    font-weight: 700;
}

.example-complexity {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: var(--radius-xl);
    background: rgba(108, 92, 231, 0.12);
    color: var(--accent-2);
}

.example-desc {
    font-size: 0.84rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 12px;
}

.example-code {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    background: var(--bg-input);
    padding: 12px;
    border-radius: var(--radius-sm);
    max-height: 100px;
    overflow: hidden;
    white-space: pre;
    line-height: 1.5;
}

/* ---------- Learn Grid ---------- */
.complexity-chart-container {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    margin-bottom: 32px;
    box-shadow: var(--shadow-md);
}

.learn-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

.learn-card {
    padding: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

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

.learn-card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.learn-notation {
    font-family: var(--font-mono);
    font-size: 1.3rem;
    font-weight: 700;
    min-width: 100px;
}

.learn-name {
    font-size: 0.95rem;
    font-weight: 600;
}

.learn-desc {
    font-size: 0.84rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 12px;
}

.learn-example {
    font-family: var(--font-mono);
    font-size: 0.76rem;
    color: var(--text-muted);
    padding: 8px 12px;
    background: var(--bg-input);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--accent-1);
}

/* ---------- Toast ---------- */
.toast {
    position: fixed;
    bottom: 32px;
    right: 32px;
    padding: 12px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.88rem;
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(16px);
    transform: translateY(100px);
    opacity: 0;
    transition: var(--transition);
    z-index: 1000;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

/* ---------- Footer ---------- */
.footer {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 24px 32px;
    color: var(--text-muted);
    font-size: 0.82rem;
    border-top: 1px solid var(--border-color);
    margin-top: 60px;
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
    .header {
        padding: 10px 16px;
        flex-wrap: wrap;
        gap: 8px;
    }
    .header-nav { order: 3; width: 100%; justify-content: center; }
    .main-content { padding: 16px; }
    .hero-title { font-size: 1.8rem; }
    .result-details { flex-direction: column; }
    .query-counter { display: none; }
}

@media (max-width: 480px) {
    .hero-title { font-size: 1.5rem; }
    .nav-btn { padding: 6px 12px; font-size: 0.78rem; }
}