/* ==========================================================================
   NPClassifier AI — Complete Stylesheet
   ICAR-IASRI, New Delhi
   ========================================================================== */

/* ===== CSS Variables ===== */
:root {
    /* Primary palette */
    --primary: #667eea;
    --primary-dark: #5a67d8;
    --primary-light: #a3bffa;
    --secondary: #764ba2;
    --accent: #f093fb;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-hero: linear-gradient(135deg, #0f0c29 0%, #302b63 50%, #24243e 100%);
    --gradient-card: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0.05) 100%);
    --gradient-glow: radial-gradient(circle at 50% 50%, rgba(102,126,234,0.15) 0%, transparent 70%);

    /* Semantic colors */
    --success: #48bb78;
    --warning: #ecc94b;
    --danger: #fc8181;
    --info: #63b3ed;

    /* Neutrals */
    --bg-body: #0f1117;
    --bg-section: #13151d;
    --bg-card: #1a1d2e;
    --bg-card-hover: #222640;
    --bg-input: #1e2235;
    --text-primary: #e2e8f0;
    --text-secondary: #a0aec0;
    --text-muted: #718096;
    --border: #2d3148;
    --border-hover: #4a5568;

    /* Typography */
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Spacing */
    --nav-height: 72px;
    --section-padding: 100px;
    --container-max: 1200px;
    --radius: 16px;
    --radius-sm: 10px;
    --radius-xs: 6px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.2);
    --shadow-md: 0 8px 30px rgba(0,0,0,0.3);
    --shadow-lg: 0 20px 60px rgba(0,0,0,0.4);
    --shadow-glow: 0 0 40px rgba(102,126,234,0.2);

    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    background: var(--bg-body);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
}

a {
    color: var(--primary-light);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--accent);
}

img {
    max-width: 100%;
    height: auto;
}

ul {
    list-style: none;
}

/* ===== Utility Classes ===== */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: var(--section-padding) 0;
    position: relative;
}

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

.glass-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    backdrop-filter: blur(10px);
    transition: var(--transition);
}

.glass-card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-glow);
    transform: translateY(-2px);
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 0.95rem;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

.btn i {
    font-size: 0.9em;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #fff;
    box-shadow: 0 4px 15px rgba(102,126,234,0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102,126,234,0.5);
    color: #fff;
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border);
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary-light);
    background: rgba(102,126,234,0.1);
}

.btn-ghost {
    background: rgba(102,126,234,0.1);
    color: var(--primary-light);
    padding: 6px 14px;
    font-size: 0.82rem;
    border-radius: var(--radius-xs);
}

.btn-ghost:hover {
    background: rgba(102,126,234,0.2);
    color: #fff;
}

.btn-lg {
    padding: 14px 32px;
    font-size: 1.05rem;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 0.85rem;
}

.btn-full {
    width: 100%;
    justify-content: center;
}

/* ==========================================================================
   NAVIGATION
   ========================================================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    z-index: 1000;
    background: rgba(15, 17, 23, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(15, 17, 23, 0.95);
    border-bottom-color: var(--border);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text-primary);
}

.logo-icon {
    width: 42px;
    height: 42px;
    background: var(--gradient-primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: #fff;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-title {
    font-weight: 800;
    font-size: 1.15rem;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.logo-subtitle {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9rem;
    border-radius: var(--radius-xs);
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--text-primary);
    background: rgba(102,126,234,0.1);
}

.nav-link.active {
    color: var(--primary-light);
    background: rgba(102,126,234,0.15);
}

.nav-link i {
    font-size: 0.85em;
}

/* Hamburger */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    position: relative;
    transition: var(--transition);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
}

.hamburger::before { top: -7px; }
.hamburger::after { top: 7px; }

.nav-toggle.active .hamburger {
    background: transparent;
}

.nav-toggle.active .hamburger::before {
    top: 0;
    transform: rotate(45deg);
}

.nav-toggle.active .hamburger::after {
    top: 0;
    transform: rotate(-45deg);
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding-top: var(--nav-height);
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-gradient {
    position: absolute;
    inset: 0;
    background: var(--gradient-hero);
}

.hero-particles {
    position: absolute;
    inset: 0;
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 820px;
    padding: 40px 24px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: rgba(102,126,234,0.15);
    border: 1px solid rgba(102,126,234,0.3);
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--primary-light);
    margin-bottom: 28px;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 900;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
}

.title-line {
    display: block;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 40px;
    max-width: 650px;
    margin-left: auto;
    margin-right: auto;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 60px;
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-light);
}

.stat-label {
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: var(--border);
}

/* Scroll indicator */
.hero-scroll {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.scroll-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 0.78rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-8px); }
    60% { transform: translateY(-4px); }
}

/* ==========================================================================
   SECTION HEADERS
   ========================================================================== */
.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 18px;
    background: rgba(102,126,234,0.1);
    border: 1px solid rgba(102,126,234,0.2);
    border-radius: 50px;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--primary-light);
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.section-title {
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
}

.section-desc {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.8;
}

/* ==========================================================================
   FEATURES SECTION
   ========================================================================== */
.features-section {
    background: var(--bg-section);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

.feature-card {
    padding: 36px 28px;
    border-radius: var(--radius);
    background: var(--bg-card);
    border: 1px solid var(--border);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

.feature-card:hover {
    transform: translateY(-6px);
    border-color: var(--primary);
    box-shadow: var(--shadow-glow);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: var(--gradient-primary);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    color: #fff;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.92rem;
    line-height: 1.7;
}

/* ==========================================================================
   WORKFLOW SECTION
   ========================================================================== */
.workflow-steps {
    max-width: 700px;
    margin: 0 auto;
}

.workflow-step {
    display: flex;
    align-items: center;
    gap: 28px;
    padding: 28px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: var(--transition);
}

.workflow-step:hover {
    transform: translateX(8px);
    border-color: var(--primary);
    box-shadow: var(--shadow-glow);
}

.step-number {
    font-size: 2.5rem;
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    min-width: 60px;
}

.step-content h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.step-content p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.step-icon {
    margin-left: auto;
    font-size: 1.5rem;
    color: var(--primary-light);
    opacity: 0.5;
}

.workflow-connector {
    height: 32px;
    width: 2px;
    background: var(--border);
    margin: 0 auto;
}

/* ==========================================================================
   CTA SECTION
   ========================================================================== */
.cta-section {
    padding: 80px 0;
}

.cta-card {
    background: var(--gradient-primary);
    border-radius: var(--radius);
    padding: 60px 40px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.cta-content {
    position: relative;
    z-index: 1;
}

.cta-content h2 {
    font-size: clamp(1.6rem, 3vw, 2.2rem);
    font-weight: 800;
    color: #fff;
    margin-bottom: 16px;
}

.cta-content p {
    color: rgba(255,255,255,0.85);
    font-size: 1.05rem;
    margin-bottom: 32px;
}

.cta-content .btn-primary {
    background: #fff;
    color: var(--primary-dark);
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.cta-content .btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.3);
}

/* ==========================================================================
   PREDICT PAGE
   ========================================================================== */
.predict-section {
    padding-top: calc(var(--nav-height) + 40px);
}

.predict-container {
    max-width: 800px;
    margin: 0 auto;
}

.input-card {
    padding: 0;
    overflow: hidden;
}

.input-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    padding: 20px 28px;
    border-bottom: 1px solid var(--border);
}

.input-header h3 {
    font-size: 1.05rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 10px;
}

.example-btns {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.input-body {
    padding: 24px 28px;
}

.smiles-textarea {
    width: 100%;
    padding: 16px 20px;
    background: var(--bg-input);
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 1rem;
    line-height: 1.6;
    resize: vertical;
    transition: var(--transition);
    outline: none;
}

.smiles-textarea::placeholder {
    color: var(--text-muted);
}

.smiles-textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(102,126,234,0.15);
}

.input-actions {
    display: flex;
    gap: 12px;
    margin-top: 16px;
}

.input-meta {
    margin-top: 8px;
    font-size: 0.82rem;
    color: var(--text-muted);
}

/* Loading Overlay */
.loading-overlay {
    display: flex;
    justify-content: center;
    padding: 60px 0;
}

.loading-spinner {
    text-align: center;
}

.spinner-ring {
    width: 50px;
    height: 50px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 16px;
}

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

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

/* Error Card */
.error-card {
    display: flex;
    align-items: center;
    gap: 16px;
    max-width: 800px;
    margin: 24px auto;
    padding: 20px 28px;
    background: rgba(252,129,129,0.1);
    border: 1px solid rgba(252,129,129,0.3);
    border-radius: var(--radius-sm);
}

.error-icon {
    font-size: 1.4rem;
    color: var(--danger);
}

.error-message {
    color: var(--danger);
    font-weight: 500;
}

/* Results Section */
.results-section {
    margin-top: 40px;
}

.result-top-row {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 24px;
    margin-bottom: 24px;
}

.structure-card,
.summary-card {
    padding: 0;
    overflow: hidden;
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
}

.card-header h3 {
    font-size: 0.95rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px;
}

.inference-time {
    font-size: 0.8rem;
    color: var(--success);
    font-weight: 600;
}

.structure-canvas {
    padding: 20px;
}

.placeholder-text {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Summary Body */
.summary-body {
    padding: 20px 24px;
}

.summary-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid rgba(45,49,72,0.5);
}

.summary-item:last-child {
    border-bottom: none;
}

.summary-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.summary-value {
    display: flex;
    align-items: center;
    gap: 10px;
}

.smiles-display {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--primary-light);
    word-break: break-all;
}

.pred-name {
    font-weight: 600;
}

.confidence-badge {
    padding: 3px 10px;
    border-radius: 50px;
    font-size: 0.78rem;
    font-weight: 700;
}

.confidence-badge.high {
    background: rgba(72,187,120,0.15);
    color: var(--success);
}

.confidence-badge.med {
    background: rgba(236,201,75,0.15);
    color: var(--warning);
}

.confidence-badge.low {
    background: rgba(252,129,129,0.15);
    color: var(--danger);
}

/* Detail Cards */
.detail-cards-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.detail-card {
    padding: 0;
    overflow: hidden;
}

.detail-header {
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 12px;
}

.level-badge {
    padding: 4px 12px;
    border-radius: 50px;
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.pathway-badge {
    background: rgba(102,126,234,0.15);
    color: var(--primary-light);
}

.superclass-badge {
    background: rgba(118,75,162,0.15);
    color: #c4a3e8;
}

.class-badge {
    background: rgba(240,147,251,0.15);
    color: var(--accent);
}

.detail-header h3 {
    font-size: 1rem;
    font-weight: 700;
}

.detail-body {
    padding: 20px 24px;
}

.predicted-main {
    margin-bottom: 20px;
}

.predicted-label {
    font-size: 0.78rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 6px;
}

.predicted-value {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.confidence-bar-container {
    width: 100%;
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 6px;
}

.confidence-bar {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 3px;
    transition: width 0.8s ease;
}

.confidence-text {
    font-size: 0.82rem;
    color: var(--text-muted);
}

.topn-header {
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 12px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

.topn-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.topn-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.85rem;
}

.topn-item.topn-best {
    font-weight: 600;
}

.topn-rank {
    color: var(--text-muted);
    min-width: 24px;
    font-weight: 700;
    font-size: 0.78rem;
}

.topn-name {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.topn-bar-bg {
    width: 60px;
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    overflow: hidden;
}

.topn-bar {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 2px;
}

.topn-pct {
    color: var(--text-muted);
    font-size: 0.78rem;
    min-width: 40px;
    text-align: right;
}

/* ==========================================================================
   BATCH RESULTS TABLE
   ========================================================================== */
.batch-results {
    padding: 0;
    overflow: hidden;
    margin-top: 32px;
}

.table-container {
    overflow-x: auto;
}

.results-table {
    width: 100%;
    border-collapse: collapse;
}

.results-table thead {
    background: rgba(102,126,234,0.1);
}

.results-table th {
    padding: 14px 16px;
    text-align: left;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
}

.results-table td {
    padding: 12px 16px;
    font-size: 0.88rem;
    border-bottom: 1px solid rgba(45,49,72,0.3);
}

.results-table tbody tr {
    transition: var(--transition);
}

.results-table tbody tr:hover {
    background: rgba(102,126,234,0.05);
}

.smiles-cell {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.conf-pill {
    padding: 3px 10px;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 700;
}

.conf-pill.high { background: rgba(72,187,120,0.15); color: var(--success); }
.conf-pill.med { background: rgba(236,201,75,0.15); color: var(--warning); }
.conf-pill.low { background: rgba(252,129,129,0.15); color: var(--danger); }

.status-ok { color: var(--success); font-size: 1.1rem; }
.status-err { color: var(--danger); font-size: 1.1rem; }
.error-cell { color: var(--danger); font-style: italic; }

/* ==========================================================================
   ABOUT PAGE
   ========================================================================== */
.about-section {
    padding-top: calc(var(--nav-height) + 40px);
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-bottom: 48px;
}

.about-card {
    padding: 32px 28px;
}

.about-icon {
    width: 52px;
    height: 52px;
    background: var(--gradient-primary);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    color: #fff;
    margin-bottom: 20px;
}

.about-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.about-card p {
    color: var(--text-secondary);
    font-size: 0.92rem;
    line-height: 1.7;
}

.about-list {
    margin-top: 8px;
}

.about-list li {
    padding: 6px 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    position: relative;
    padding-left: 16px;
}

.about-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary-light);
}

/* Tech Stack */
.tech-stack {
    text-align: center;
    margin-bottom: 48px;
}

.tech-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 28px;
}

.tech-grid {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 20px;
}

.tech-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 20px 28px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    transition: var(--transition);
    min-width: 120px;
}

.tech-item:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    box-shadow: var(--shadow-glow);
}

.tech-logo {
    font-size: 2rem;
    color: var(--primary-light);
}

.tech-item span {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
}

/* API Section */
.api-section {
    padding: 32px;
}

.api-section h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.api-endpoints {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 28px;
}

.api-endpoint {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 12px 16px;
    background: var(--bg-input);
    border-radius: var(--radius-xs);
}

.method {
    padding: 4px 12px;
    border-radius: 4px;
    font-size: 0.72rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    min-width: 50px;
    text-align: center;
}

.method.get { background: rgba(72,187,120,0.2); color: var(--success); }
.method.post { background: rgba(99,179,237,0.2); color: var(--info); }

.api-endpoint code {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--primary-light);
}

.api-desc {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-left: auto;
}

.api-example h4 {
    font-size: 0.95rem;
    margin-bottom: 12px;
}

.api-example pre {
    background: var(--bg-input);
    padding: 16px 20px;
    border-radius: var(--radius-xs);
    overflow-x: auto;
}

.api-example code {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* ==========================================================================
   DEVELOPERS PAGE
   ========================================================================== */
.developers-section {
    padding-top: calc(var(--nav-height) + 40px);
}

.developers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 28px;
    margin-bottom: 48px;
}

.developer-card {
    perspective: 1000px;
}

.dev-card-inner {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 36px 28px;
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.dev-card-inner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

.dev-card-inner:hover {
    transform: translateY(-8px);
    border-color: var(--primary);
    box-shadow: var(--shadow-glow), var(--shadow-md);
}

.dev-card-inner:hover::before {
    transform: scaleX(1);
}

.dev-photo-container {
    position: relative;
    width: 120px;
    height: 120px;
    margin: 0 auto 24px;
}

.dev-photo-ring {
    position: absolute;
    inset: -4px;
    border-radius: 50%;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.dev-card-inner:hover .dev-photo-ring {
    opacity: 1;
}

.dev-photo {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    position: relative;
    z-index: 1;
    border: 4px solid var(--bg-card);
    transition: var(--transition);
}

.dev-card-inner:hover .dev-photo {
    transform: scale(1.05);
}

.dev-name {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.dev-designation {
    color: var(--primary-light);
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.dev-affiliation {
    color: var(--text-muted);
    font-size: 0.82rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

/* Institute Card */
.institute-card {
    padding: 40px;
}

.institute-content {
    display: flex;
    gap: 28px;
    align-items: flex-start;
}

.institute-icon {
    width: 64px;
    height: 64px;
    background: var(--gradient-primary);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    color: #fff;
    flex-shrink: 0;
}

.institute-text h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.institute-text p {
    color: var(--text-secondary);
    font-size: 0.92rem;
    line-height: 1.8;
}

/* ==========================================================================
   CONTACT PAGE
   ========================================================================== */
.contact-section {
    padding-top: calc(var(--nav-height) + 40px);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.3fr;
    gap: 32px;
    margin-bottom: 48px;
}

.contact-cards {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-info-card {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 24px;
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    color: #fff;
    flex-shrink: 0;
}

.contact-detail h4 {
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.contact-detail p {
    color: var(--text-secondary);
    font-size: 0.88rem;
    line-height: 1.6;
}

.contact-detail a {
    color: var(--primary-light);
}

/* Contact Form */
.contact-form-card {
    padding: 36px;
}

.contact-form-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-input);
    border: 2px solid var(--border);
    border-radius: var(--radius-xs);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.95rem;
    outline: none;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(102,126,234,0.15);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.form-group textarea {
    resize: vertical;
}

.form-success {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 40px 20px;
    text-align: center;
}

.form-success i {
    font-size: 3rem;
    color: var(--success);
}

.form-success p {
    color: var(--text-secondary);
    font-size: 1.05rem;
}

/* Map */
.map-container {
    padding: 0;
    overflow: hidden;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.footer {
    position: relative;
    background: var(--bg-section);
    margin-top: 0;
}

.footer-wave {
    color: var(--bg-section);
    line-height: 0;
    margin-top: -1px;
}

.footer-wave svg {
    width: 100%;
    height: 60px;
}

.footer-content {
    padding: 40px 24px 24px;
    max-width: var(--container-max);
    margin: 0 auto;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.15rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.footer-logo i {
    color: var(--primary-light);
}

.footer-desc {
    color: var(--text-muted);
    font-size: 0.88rem;
    line-height: 1.7;
}

.footer-section h4 {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.footer-section ul li {
    margin-bottom: 8px;
}

.footer-section ul li a {
    color: var(--text-muted);
    font-size: 0.88rem;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition);
}

.footer-section ul li a:hover {
    color: var(--primary-light);
    transform: translateX(4px);
}

.footer-section ul li a i {
    font-size: 0.65em;
    color: var(--primary);
}

.footer-section p {
    color: var(--text-muted);
    font-size: 0.88rem;
    line-height: 1.6;
}

.footer-bottom {
    border-top: 1px solid var(--border);
    padding-top: 20px;
    text-align: center;
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 0.82rem;
}

.footer-tech {
    margin-top: 4px;
    font-size: 0.75rem !important;
    color: var(--border-hover) !important;
}

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */
@media (max-width: 992px) {
    .result-top-row {
        grid-template-columns: 1fr;
    }

    .detail-cards-row {
        grid-template-columns: 1fr;
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .institute-content {
        flex-direction: column;
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 64px;
        --nav-height: 64px;
    }

    .nav-links {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: rgba(15,17,23,0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 20px;
        gap: 4px;
        border-bottom: 1px solid var(--border);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: var(--transition);
    }

    .nav-links.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }

    .nav-toggle {
        display: block;
    }

    .nav-link {
        padding: 12px 16px;
        width: 100%;
        border-radius: var(--radius-xs);
    }

    .hero-stats {
        gap: 20px;
    }

    .stat-divider {
        display: none;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .workflow-step {
        flex-direction: column;
        text-align: center;
    }

    .step-icon {
        margin-left: 0;
    }

    .developers-grid {
        grid-template-columns: 1fr 1fr;
    }

    .api-endpoint {
        flex-direction: column;
        align-items: flex-start;
    }

    .api-desc {
        margin-left: 0;
    }
}

@media (max-width: 480px) {
    .developers-grid {
        grid-template-columns: 1fr;
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .input-actions {
        flex-direction: column;
    }

    .input-actions .btn {
        width: 100%;
        justify-content: center;
    }

    .example-btns {
        justify-content: center;
    }
}

/* ==========================================================================
   PARTICLES (Background decoration)
   ========================================================================== */
.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: rgba(102,126,234,0.3);
    border-radius: 50%;
    animation: float-particle linear infinite;
}

@keyframes float-particle {
    0% {
        transform: translateY(100vh) rotate(0deg);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    90% {
        opacity: 1;
    }
    100% {
        transform: translateY(-100px) rotate(720deg);
        opacity: 0;
    }
}

/* ==========================================================================
   SCROLLBAR
   ========================================================================== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-body);
}

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

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

/* ==========================================================================
   SELECTION
   ========================================================================== */
::selection {
    background: rgba(102,126,234,0.3);
    color: #fff;
}