/* ========================================
   TJTech Corporate Website — styles.css
   Design: Lobster Red + Hermes Black/AI
   ======================================== */

/* CSS Variables */
:root {
    --primary: #E84545;
    --primary-dark: #C73535;
    --primary-glow: rgba(232, 69, 69, 0.15);
    --bg-dark: #0D0D0D;
    --bg-surface: #1A1A1A;
    --bg-surface-light: #252525;
    --border: #333333;
    --text-primary: #FFFFFF;
    --text-secondary: #A0A0A0;
    --text-dim: #666666;
    --font-display: 'Orbitron', 'Noto Sans SC', sans-serif;
    --font-body: 'Noto Sans SC', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-red: 0 0 30px rgba(232, 69, 69, 0.3);
    --radius: 8px;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Typography */
.section-tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    color: var(--primary);
    text-transform: uppercase;
    margin-bottom: 12px;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 16px;
    line-height: 1.2;
}

.section-desc {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 600px;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-header .section-desc {
    margin: 0 auto;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--radius);
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    white-space: nowrap;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    box-shadow: var(--shadow-red);
    transform: translateY(-2px);
}

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

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

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

.btn-arrow {
    transition: transform 0.2s;
}

.btn:hover .btn-arrow {
    transform: translateX(4px);
}

/* ========================================
   NAVIGATION
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(13, 13, 13, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    padding: 12px 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 700;
    transition: var(--transition);
}

.nav-logo:hover {
    opacity: 0.8;
}

.logo-icon {
    font-size: 1.8rem;
    color: var(--primary);
    line-height: 1;
}

.logo-accent {
    color: var(--primary);
}

.nav-links {
    display: flex;
    gap: 36px;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 400;
    color: var(--text-secondary);
    position: relative;
    transition: var(--transition);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width 0.3s;
}

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

.nav-link:hover::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
}

/* ========================================
   HERO
   ======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

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

.grid-overlay {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(232, 69, 69, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(232, 69, 69, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
}

.glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.4;
}

.glow-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--primary) 0%, transparent 70%);
    top: -200px;
    right: -100px;
}

.glow-2 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    bottom: -100px;
    left: -50px;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
    padding: 0 24px;
    animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(232, 69, 69, 0.1);
    border: 1px solid rgba(232, 69, 69, 0.3);
    border-radius: 100px;
    font-size: 0.85rem;
    color: var(--primary);
    margin-bottom: 32px;
    font-weight: 500;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--primary);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.2); }
}

.hero-title {
    font-family: var(--font-display);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 24px;
}

.title-cn {
    display: block;
    font-size: clamp(3rem, 8vw, 5.5rem);
    letter-spacing: 0.05em;
    background: linear-gradient(135deg, #fff 0%, #ccc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.title-en {
    display: block;
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    color: var(--primary);
    letter-spacing: 0.3em;
    text-shadow: 0 0 40px rgba(232, 69, 69, 0.5);
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 48px;
    line-height: 1.8;
}

.highlight {
    color: var(--primary);
    font-weight: 500;
}

.hero-stats {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 40px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

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

.stat-num {
    display: block;
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

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

.hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-dim);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(8px); }
}

.scroll-arrow {
    font-size: 1.2rem;
}

/* ========================================
   SERVICES
   ======================================== */
.services {
    padding: 120px 0;
    position: relative;
}

.services::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border), transparent);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.service-card {
    position: relative;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-left: 3px solid var(--primary);
    border-radius: var(--radius);
    padding: 36px;
    transition: var(--transition);
    cursor: pointer;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--primary-glow) 0%, transparent 50%);
    opacity: 0;
    transition: opacity 0.3s;
}

.service-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    box-shadow: var(--shadow-red);
}

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

.service-icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
    position: relative;
}

.service-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 12px;
    position: relative;
}

.service-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 20px;
    position: relative;
}

.service-list {
    position: relative;
}

.service-list li {
    position: relative;
    padding-left: 16px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 8px;
}

.service-list li::before {
    content: '›';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: bold;
}

.service-arrow {
    position: absolute;
    bottom: 36px;
    right: 36px;
    font-size: 1.5rem;
    color: var(--primary);
    opacity: 0;
    transform: translateX(-10px);
    transition: var(--transition);
}

.service-card:hover .service-arrow {
    opacity: 1;
    transform: translateX(0);
}

/* ========================================
   ABOUT
   ======================================== */
.about {
    padding: 120px 0;
    background: var(--bg-surface);
}

.about-wrapper {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 80px;
    align-items: start;
}

.about-visual {
    text-align: center;
}

.avatar-container {
    position: relative;
    display: inline-block;
    margin-bottom: 24px;
}

.avatar-container img.avatar-photo {
    display: block;
}

.avatar-placeholder {
    width: 200px;
    height: 200px;
    border-radius: 16px;
    background: linear-gradient(135deg, var(--bg-surface-light) 0%, var(--bg-dark) 100%);
    border: 2px solid var(--border);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    position: relative;
    z-index: 1;
}

.avatar-photo {
    width: 200px;
    height: 200px;
    border-radius: 16px;
    object-fit: cover;
    object-position: top;
    border: 2px solid var(--border);
    position: relative;
    z-index: 1;
}

.avatar-initials {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary);
}

.avatar-title {
    font-size: 1rem;
    color: var(--text-secondary);
}

.avatar-glow {
    position: absolute;
    inset: -20px;
    background: radial-gradient(circle, var(--primary-glow) 0%, transparent 70%);
    border-radius: 50%;
    z-index: 0;
}

.cert-badges {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.badge {
    display: inline-block;
    padding: 6px 14px;
    background: var(--bg-surface-light);
    border: 1px solid var(--border);
    border-radius: 100px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.about-content .section-tag {
    display: block;
    text-align: left;
}

.about-content .section-title {
    text-align: left;
    margin-bottom: 24px;
}

.about-intro {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.8;
}

.about-intro strong {
    color: var(--text-primary);
}

.about-details {
    margin-bottom: 32px;
}

.about-details p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.8;
    margin-bottom: 16px;
}

.about-details strong {
    color: var(--text-primary);
}

.about-badges {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.about-clients {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}

.clients-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-right: 4px;
}

.client-tag {
    display: inline-block;
    padding: 4px 12px;
    background: var(--bg-surface-light);
    border: 1px solid var(--border);
    border-radius: 100px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    transition: var(--transition);
}

.client-tag:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.about-badge {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    background: var(--bg-surface-light);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.9rem;
}

.badge-icon {
    font-size: 1.2rem;
}

/* ========================================
   COURSES
   ======================================== */
.courses {
    padding: 120px 0;
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.course-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px 24px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.course-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s;
}

.course-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
}

.course-card:hover::after {
    transform: scaleX(1);
}

.course-num {
    font-family: var(--font-mono);
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--primary);
    opacity: 0.3;
    line-height: 1;
    margin-bottom: 12px;
}

.course-card h3 {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.course-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* ========================================
   CONTACT
   ======================================== */
.contact {
    padding: 120px 0;
    background: var(--bg-surface);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
}

.contact-info .section-tag {
    display: block;
    text-align: left;
}

.contact-info .section-title {
    text-align: left;
    margin-bottom: 16px;
}

.contact-desc {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 40px;
    max-width: 400px;
}

.contact-items {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.contact-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.contact-item div {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.contact-item strong {
    font-size: 1rem;
}

.contact-item span {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Form */
.contact-form-wrapper {
    position: relative;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    background: var(--bg-surface-light);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: var(--transition);
}

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

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

.form-group select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23A0A0A0' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    padding-right: 40px;
}

.form-group select option {
    background: var(--bg-surface);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-success {
    position: absolute;
    inset: 0;
    background: var(--bg-surface);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    gap: 16px;
    border-radius: var(--radius);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.form-success.visible {
    opacity: 1;
    visibility: visible;
}

.success-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: #fff;
}

.form-success h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
}

.form-success p {
    color: var(--text-secondary);
}

/* ========================================
   FOOTER
   ======================================== */
.footer {
    padding: 64px 0 32px;
    border-top: 1px solid var(--border);
}

.footer-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 48px;
    gap: 48px;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-brand .logo-icon {
    font-size: 2rem;
}

.footer-brand .logo-text {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
}

.footer-tagline {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    gap: 64px;
}

.footer-col {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-col h4 {
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.footer-col a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: var(--transition);
}

.footer-col a:hover {
    color: var(--primary);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 32px;
    border-top: 1px solid var(--border);
    color: var(--text-dim);
    font-size: 0.85rem;
}

/* ========================================
   ANIMATIONS — Intersection Observer
   ======================================== */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ========================================
   RESPONSIVE
   ======================================== */
@media (max-width: 1024px) {
    .courses-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        gap: 0;
        background: rgba(13, 13, 13, 0.98);
        border-bottom: 1px solid var(--border);
        padding: 16px 0;
    }

    .nav-links.open {
        display: flex;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

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

    .about-wrapper {
        grid-template-columns: 1fr;
        gap: 48px;
        text-align: center;
    }

    .about-visual {
        order: -1;
    }

    .about-content .section-tag,
    .about-content .section-title {
        text-align: center;
    }

    .about-badges {
        grid-template-columns: 1fr;
    }

    .contact-wrapper {
        grid-template-columns: 1fr;
        gap: 48px;
    }

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

    .footer-top {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 32px;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }

    .hero-stats {
        gap: 24px;
    }

    .stat-divider {
        display: none;
    }

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

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }

    .container {
        padding: 0 16px;
    }

    .services,
    .about,
    .courses,
    .contact {
        padding: 80px 0;
    }

    .service-card {
        padding: 24px;
    }

    .hero-cta {
        flex-direction: column;
        width: 100%;
    }

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

/* AI Ops course card accent */
.course-num-ai {
    background: linear-gradient(135deg, var(--primary), #9333ea) !important;
}