/* =========================================================
                   2. GLOBAL BACKGROUND CỰC QUANG (AURORA)
                   ========================================================= */
.abstract-art-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.art-glow-1, .art-glow-2, .art-glow-3 {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    mix-blend-mode: screen;
    animation: floatArt 25s infinite ease-in-out alternate;
}

.art-glow-1 {
    background-color: rgba(138, 79, 255, 0.25);
    width: 50vw;
    height: 50vw;
    top: -10%;
    left: -5%;
}

.art-glow-2 {
    background-color: rgba(14, 165, 233, 0.2);
    width: 60vw;
    height: 60vw;
    bottom: -20%;
    right: -10%;
    animation-delay: -5s;
}

.art-glow-3 {
    background-color: rgba(16, 185, 129, 0.15);
    width: 40vw;
    height: 40vw;
    top: 30%;
    left: 40%;
    animation-delay: -10s;
}

.art-grid-overlay {
    position: absolute;
    inset: 0;
    background-image: linear-gradient(to right, rgba(255,255,255,0.03) 1px, transparent 1px), linear-gradient(to bottom, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    mask-image: radial-gradient(circle at center, black 10%, transparent 80%);
    -webkit-mask-image: radial-gradient(circle at center, black 10%, transparent 80%);
}

@keyframes floatArt {
    0% {
        transform: translate(0, 0) scale(1);
    }

    100% {
        transform: translate(5%, 5%) scale(1.1);
    }
}

/* =========================================================
                   3. UI COMPONENTS
                   ========================================================= */
.glass-card {
    background: var(--bg-surface);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 40px rgba(0,0,0,0.3), inset 0 1px 0 rgba(255,255,255,0.05);
    transition: transform 0.3s ease, border-color 0.3s ease;
}

    .glass-card:hover {
        border-color: var(--border-color-hover);
        transform: translateY(-5px);
    }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 16px 32px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1.05rem;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #fff;
    box-shadow: 0 4px 15px rgba(138, 79, 255, 0.3);
}

    .btn-primary:hover {
        transform: translateY(-2px);
        box-shadow: 0 8px 25px rgba(138, 79, 255, 0.5);
        filter: brightness(1.1);
    }

.btn-outline {
    background: rgba(255,255,255,0.05);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
}

    .btn-outline:hover {
        background: rgba(255,255,255,0.1);
        border-color: var(--text-secondary);
    }

.text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-left: 6px;
}

/* =========================================================
                   SECTION 1: TOP NAVIGATION
                   ========================================================= */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 20px 0;
    transition: all 0.3s ease;
}

    .navbar.scrolled {
        padding: 12px 0;
        background: rgba(5, 8, 16, 0.8);
        backdrop-filter: blur(20px);
        border-bottom: 1px solid var(--border-color);
    }

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

 

.nav-links {
    display: flex;
    gap: 32px;
    align-items: center;
}

    .nav-links a {
        color: var(--text-secondary);
        font-weight: 500;
        font-size: 0.95rem;
        transition: color 0.2s;
    }

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

.nav-actions {
    display: flex;
    gap: 16px;
    align-items: center;
}

    .nav-actions .login-link {
        color: var(--text-primary);
        font-weight: 600;
        font-size: 0.95rem;
    }

        .nav-actions .login-link:hover {
            color: var(--color-cyan);
        }

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: #fff;
    font-size: 1.5rem;
    cursor: pointer;
}

@media (max-width: 768px) {
    .nav-links, .nav-actions {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
    }

    .navbar.menu-active {
        background: rgba(5, 8, 16, 0.98);
        border-bottom: 1px solid var(--border-color);
    }

        .navbar.menu-active .nav-container {
            flex-wrap: wrap;
        }

        .navbar.menu-active .logo {
            order: 1;
        }

        .navbar.menu-active .mobile-menu-btn {
            order: 2;
            margin-left: auto;
        }

        .navbar.menu-active .nav-links,
        .navbar.menu-active .nav-actions {
            display: flex;
            flex-direction: column;
            width: 100%;
            gap: 20px;
            text-align: center;
        }

        .navbar.menu-active .nav-links {
            order: 3;
            padding: 24px 0 10px;
            border-top: 1px solid rgba(255,255,255,0.05);
            margin-top: 16px;
        }

        .navbar.menu-active .nav-actions {
            order: 4;
            padding-bottom: 24px;
        }

            .navbar.menu-active .nav-actions .btn {
                display: inline-flex;
                width: 100%;
                justify-content: center;
            }
}

/* =========================================================
                   SECTION 2: HERO BANNER
                   ========================================================= */
.hero {
    padding: 180px 0 100px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(14, 165, 233, 0.1);
    border: 1px solid rgba(14, 165, 233, 0.2);
    border-radius: 30px;
    color: var(--color-cyan);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 24px;
    letter-spacing: 0.5px;
}

.hero h1 {
    font-size: 4.2rem;
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 24px;
    max-width: 900px;
    letter-spacing: -1.5px;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 650px;
    margin-bottom: 40px;
    line-height: 1.6;
}

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

.social-proof {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.avatars {
    display: flex;
}

    .avatars img {
        width: 40px;
        height: 40px;
        border-radius: 50%;
        border: 2px solid var(--bg-body);
        margin-left: -12px;
    }

        .avatars img:first-child {
            margin-left: 0;
        }

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

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

@media (max-width: 768px) {
    .hero {
        padding: 140px 0 80px;
    }

        .hero h1 {
            font-size: 2.8rem;
        }

        .hero p {
            font-size: 1.1rem;
        }

    .hero-btns {
        flex-direction: column;
        width: 100%;
        max-width: 100%;
        margin: 0 auto 40px;
    }

        .hero-btns .btn {
            width: 100%;
        }
}

/* =========================================================
                   SECTION 3: TRUST BAR
                   ========================================================= */
.trust-bar {
    padding: 40px 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    background: rgba(5, 8, 16, 0.4);
}

.trust-title {
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 30px;
    font-weight: 600;
}

.trust-logos {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 60px;
    flex-wrap: wrap;
    opacity: 0.6;
}

.trust-logo-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.2rem;
    font-weight: 700;
    color: #fff;
}

    .trust-logo-item i {
        font-size: 1.5rem;
    }

@media (max-width: 768px) {
    .trust-logos {
        gap: 30px;
    }

    .trust-logo-item {
        font-size: 1rem;
    }
}

/* =========================================================
                   SECTION 4: USP SECTION
                   ========================================================= */
.usp-section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

    .section-header h2 {
        font-size: 2.5rem;
        font-weight: 800;
        margin-bottom: 16px;
    }

    .section-header p {
        color: var(--text-secondary);
        font-size: 1.1rem;
        max-width: 600px;
        margin: 0 auto;
    }

.usp-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.usp-card {
    padding: 32px 24px;
    text-align: center;
}

.usp-icon {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    background: rgba(138, 79, 255, 0.1);
    color: var(--color-violet);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin: 0 auto 20px;
    border: 1px solid rgba(138, 79, 255, 0.2);
}

.usp-card h4 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.usp-card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

@media (max-width: 1024px) {
    .usp-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 576px) {
    .usp-grid {
        grid-template-columns: 1fr;
    }
}

/* =========================================================
                   SECTION 5: FEATURE SHOWCASE
                   ========================================================= */
.showcase-section {
    padding: 40px 0 100px;
    overflow: hidden;
}

.showcase-row {
    display: flex;
    align-items: center;
    gap: 80px;
    margin-bottom: 140px;
}

    .showcase-row:last-child {
        margin-bottom: 0;
    }

    .showcase-row.reverse {
        flex-direction: row-reverse;
    }

.showcase-content {
    flex: 1;
}

.showcase-visual {
    flex: 1;
    position: relative;
    width: 100%;
}

.feature-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 20px;
}

.tag-search {
    color: var(--color-cyan);
    background: rgba(14, 165, 233, 0.1);
    border: 1px solid rgba(14, 165, 233, 0.2);
}

.tag-ai {
    color: var(--color-violet);
    background: rgba(138, 79, 255, 0.1);
    border: 1px solid rgba(138, 79, 255, 0.2);
}

.showcase-content h3 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 20px;
    line-height: 1.2;
}

.showcase-content p {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 30px;
    line-height: 1.6;
}

.showcase-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 40px;
}

    .showcase-list li {
        display: flex;
        align-items: center;
        gap: 12px;
        font-size: 1.05rem;
        font-weight: 500;
        color: var(--text-primary);
    }

        .showcase-list li i {
            font-size: 1.2rem;
            flex-shrink: 0;
        }

.icon-check-search {
    color: var(--color-cyan);
}

.icon-check-ai {
    color: var(--color-violet);
}

/* Nút Explore riêng biệt */
.btn-explore-search {
    border: 1px solid rgba(14, 165, 233, 0.4);
    color: var(--color-cyan);
    background: rgba(14, 165, 233, 0.05);
    backdrop-filter: blur(10px);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: var(--radius-md);
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s;
}

    .btn-explore-search:hover {
        background: rgba(14, 165, 233, 0.2);
        border-color: var(--color-cyan);
        color: #fff;
    }

.btn-explore-ai {
    border: 1px solid rgba(138, 79, 255, 0.4);
    color: var(--color-violet);
    background: rgba(138, 79, 255, 0.05);
    backdrop-filter: blur(10px);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: var(--radius-md);
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s;
}

    .btn-explore-ai:hover {
        background: rgba(138, 79, 255, 0.2);
        border-color: var(--color-violet);
        color: #fff;
    }

/* UI Mockup Ảo Trôi Nổi */
.mockup-container {
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: 0 30px 60px rgba(0,0,0,0.5), inset 0 1px 0 rgba(255,255,255,0.05);
    position: relative;
    z-index: 2;
    width: 100%; /* Fix lỗi co cụm trên mobile */
}

.showcase-visual::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80%;
    height: 80%;
    border-radius: 50%;
    filter: blur(80px);
    z-index: 1;
    opacity: 0.4;
}

.visual-search::before {
    background: var(--color-cyan);
}

.visual-ai::before {
    background: var(--color-violet);
}

.mock-header {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
}

.mock-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #475569;
}

    .mock-dot.red {
        background: #EF4444;
    }

    .mock-dot.yellow {
        background: #F59E0B;
    }

    .mock-dot.green {
        background: #10B981;
    }

/* Search Mockup */
.mock-search-bar {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    padding: 16px 20px;
    border-radius: 30px;
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 24px;
    color: var(--text-secondary);
}

.mock-serp-item {
    background: rgba(0,0,0,0.3);
    border-left: 3px solid transparent;
    padding: 16px;
    border-radius: 8px;
    margin-bottom: 12px;
    transition: all 0.3s;
}

    .mock-serp-item.active {
        border-left-color: var(--color-cyan);
        background: rgba(14, 165, 233, 0.05);
    }

.mock-title {
    height: 12px;
    background: var(--text-secondary);
    border-radius: 4px;
    margin-bottom: 12px;
    width: 60%;
}

    .mock-title.active {
        background: var(--color-cyan);
        width: 80%;
    }

.mock-desc {
    height: 8px;
    background: #334155;
    border-radius: 4px;
    width: 90%;
    margin-bottom: 8px;
}

    .mock-desc.short {
        width: 40%;
    }

/* AI Mockup */
.mock-chat-msg {
    display: flex;
    gap: 16px;
    margin-bottom: 20px;
}

.mock-avatar {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    flex-shrink: 0;
    background: var(--bg-body);
    display: flex;
    align-items: center;
    justify-content: center;
}

    .mock-avatar.ai {
        background: var(--gradient-primary);
        color: white;
    }

.mock-bubble {
    background: rgba(255,255,255,0.05);
    padding: 16px;
    border-radius: 12px 12px 12px 4px;
    flex: 1;
    border: 1px solid rgba(255,255,255,0.05);
}

.mock-text-line {
    height: 8px;
    background: var(--text-secondary);
    border-radius: 4px;
    margin-bottom: 10px;
    width: 100%;
}

    .mock-text-line.highlight {
        background: var(--color-violet);
        width: 40%;
        height: 12px;
        margin-top: 16px;
    }

/* ĐIỀU CHỈNH RESPONSIVE CHO MOBILE & TABLET */
@media (max-width: 992px) {
    .showcase-row, .showcase-row.reverse {
        flex-direction: column;
        gap: 40px;
        margin-bottom: 80px;
    }

    .showcase-content, .showcase-visual {
        width: 100%;
    }

        .showcase-content h3 {
            font-size: 2rem;
        }

    .mockup-container {
        padding: 24px;
    }
}

@media (max-width: 768px) {
    .showcase-content .btn-explore-search, .showcase-content .btn-explore-ai {
        width: 100%;
        margin-top: 10px;
    }

    .mock-search-bar {
        font-size: 0.9rem;
        padding: 12px 16px;
    }
}

/* =========================================================
                   SECTION 6: HOW IT WORKS
                   ========================================================= */
.hiw-section {
    padding: 80px 0 120px;
}

.hiw-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    position: relative;
    margin-top: 60px;
}

    .hiw-grid::before {
        content: '';
        position: absolute;
        top: 30px;
        left: 15%;
        right: 15%;
        height: 2px;
        background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1) 50%, transparent);
        z-index: 0;
    }

.hiw-step {
    text-align: center;
    position: relative;
    z-index: 1;
}

.step-num {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: var(--bg-body);
    border: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 800;
    margin: 0 auto 24px;
    color: var(--text-primary);
    box-shadow: 0 0 0 8px rgba(10, 15, 28, 0.8);
    transition: all 0.3s;
}

.hiw-step:hover .step-num {
    border-color: var(--color-cyan);
    color: var(--color-cyan);
    box-shadow: 0 0 20px rgba(14, 165, 233, 0.3), 0 0 0 8px rgba(10, 15, 28, 0.8);
}

.hiw-step h4 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
}

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

@media (max-width: 768px) {
    .hiw-grid::before {
        display: none;
    }

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

/* =========================================================
                   SECTION 7: CTA BANNER
                   ========================================================= */
.cta-section {
    padding: 0 0 100px;
}

.cta-banner {
    background: linear-gradient(135deg, rgba(138, 79, 255, 0.1) 0%, rgba(14, 165, 233, 0.1) 100%);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: var(--radius-xl);
    padding: 80px 40px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

    .cta-banner::after {
        content: '';
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        width: 600px;
        height: 600px;
        background: var(--gradient-primary);
        filter: blur(150px);
        opacity: 0.15;
        z-index: 0;
        pointer-events: none;
    }

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

    .cta-content h2 {
        font-size: 3rem;
        font-weight: 900;
        margin-bottom: 20px;
        letter-spacing: -1px;
    }

    .cta-content p {
        font-size: 1.15rem;
        color: var(--text-secondary);
        margin-bottom: 40px;
    }

@media (max-width: 768px) {
    .cta-banner {
        padding: 50px 24px;
    }

    .cta-content h2 {
        font-size: 2.2rem;
    }

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