/* ── Dark Hero ── */
    .hero {
        min-height: 100vh;
        display: flex;
        align-items: center;
        justify-content: center;
        padding: 120px 24px 100px;
        text-align: center;
        background: #0a0f1e;
        color: #ffffff;
        position: relative;
        overflow: hidden;
    }

    /* Subtle grid overlay */
    .hero::before {
        content: '';
        position: absolute;
        inset: 0;
        background-image:
            linear-gradient(rgba(77,107,254,0.04) 1px, transparent 1px),
            linear-gradient(90deg, rgba(77,107,254,0.04) 1px, transparent 1px);
        background-size: 64px 64px;
        pointer-events: none;
    }

    /* Radial glow behind content */
    .hero::after {
        content: '';
        position: absolute;
        top: 30%;
        left: 50%;
        transform: translate(-50%, -50%);
        width: 800px;
        height: 500px;
        background: radial-gradient(ellipse, rgba(77,107,254,0.12) 0%, transparent 70%);
        pointer-events: none;
    }

    .hero-content {
        max-width: 760px;
        position: relative;
        z-index: 1;
    }

    .hero-badge {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        padding: 7px 16px;
        font-size: 13px;
        font-weight: 500;
        color: rgba(255,255,255,0.7);
        background: rgba(77,107,254,0.12);
        border: 1px solid rgba(77,107,254,0.25);
        border-radius: 100px;
        margin-bottom: 36px;
        backdrop-filter: blur(8px);
    }

    .hero-badge-dot {
        width: 6px;
        height: 6px;
        background: #4D6BFE;
        border-radius: 50%;
        box-shadow: 0 0 8px rgba(77,107,254,0.6);
        animation: pulse 2s infinite;
    }

    @keyframes pulse {
        0%, 100% { opacity: 1; }
        50% { opacity: 0.4; }
    }

    .hero h1 {
        font-size: clamp(40px, 7vw, 58px);
        font-weight: 800;
        letter-spacing: -3px;
        line-height: 1.0;
        margin-bottom: 24px;
        background: linear-gradient(180deg, #ffffff 40%, rgba(77,107,254,0.6) 100%);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }

    .hero p {
        font-size: 18px;
        color: rgba(255,255,255,0.55);
        max-width: 560px;
        margin: 0 auto 44px;
        line-height: 1.7;
    }

    .hero-actions {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 12px;
        flex-wrap: wrap;
    }

    .hero .btn-hero {
        padding: 16px 36px;
        font-size: 16px;
        font-weight: 600;
        border-radius: 14px;
        border: none;
        cursor: pointer;
        transition: all 0.2s;
        text-decoration: none;
        display: inline-flex;
        align-items: center;
        gap: 10px;
        line-height: 1;
    }

    .btn-hero-primary {
        background: #4D6BFE;
        color: #ffffff;
    }

    .btn-hero-primary:hover {
        background: #3a58e0;
        transform: translateY(-1px);
        box-shadow: 0 8px 32px rgba(77,107,254,0.35);
    }

    .btn-hero-ghost {
        background: rgba(255,255,255,0.08);
        color: rgba(255,255,255,0.8);
        border: 1px solid rgba(255,255,255,0.12);
    }

    .btn-hero-ghost:hover {
        background: rgba(255,255,255,0.12);
        color: #ffffff;
    }

    /* Hero chat input */
    .hero-input-title {
        font-size: 18px;
        font-weight: 600;
        color: rgba(255,255,255,0.7);
        margin-bottom: 14px;
        text-align: center;
    }

    .hero-chat-input {
        max-width: 560px;
        margin: 48px auto 0;
        width: 100%;
    }

    .hero-input-box {
        display: flex;
        align-items: center;
        gap: 10px;
        background: rgba(77,107,254,0.08);
        border: 1px solid rgba(77,107,254,0.2);
        border-radius: 16px;
        padding: 12px 12px 12px 18px;
        transition: all 0.2s;
        backdrop-filter: blur(8px);
    }

    .hero-input-box:focus-within {
        border-color: rgba(77,107,254,0.5);
        background: rgba(77,107,254,0.12);
        box-shadow: 0 4px 24px rgba(0,0,0,0.2);
    }

    .hero-input-box textarea {
        flex: 1;
        border: none;
        background: transparent;
        resize: none;
        outline: none;
        font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', Roboto, sans-serif;
        font-size: 16px;
        color: #ffffff;
        line-height: 1.5;
        max-height: 120px;
        min-height: 24px;
        padding: 0;
    }

    .hero-input-box textarea::placeholder {
        color: rgba(255,255,255,0.35);
    }

    .hero-send-btn {
        width: 36px;
        height: 36px;
        border-radius: 50%;
        background: #4D6BFE;
        border: none;
        display: flex;
        align-items: center;
        justify-content: center;
        flex-shrink: 0;
        cursor: pointer;
        transition: all 0.15s;
        color: #ffffff;
    }

    .hero-send-btn:disabled {
        opacity: 0.15;
        cursor: not-allowed;
    }

    .hero-send-btn:not(:disabled):hover {
        opacity: 0.85;
        transform: scale(1.05);
    }

    .hero-send-btn svg {
        width: 16px;
        height: 16px;
    }

    @media (max-width: 640px) {
        .hero-chat-input { margin-top: 32px; }
        .hero-input-box { padding: 10px 10px 10px 14px; }
        .hero-input-box textarea { font-size: 15px; }
    }

    /* Floating particles */
    .hero-particles {
        position: absolute;
        inset: 0;
        pointer-events: none;
        overflow: hidden;
    }

    .hero-particle {
        position: absolute;
        width: 2px;
        height: 2px;
        background: rgba(77,107,254,0.3);
        border-radius: 50%;
        animation: float linear infinite;
    }

    @keyframes float {
        0% { transform: translateY(100vh) scale(0); opacity: 0; }
        10% { opacity: 1; }
        90% { opacity: 1; }
        100% { transform: translateY(-10vh) scale(1); opacity: 0; }
    }

    /* ── RU messenger buttons ── */
    .hero-ru-btns {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 12px;
        flex-wrap: wrap;
        margin-top: 20px;
    }

    .hero-ru-btn {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        padding: 14px 28px;
        font-size: 15px;
        font-weight: 600;
        color: #fff;
        border-radius: 14px;
        text-decoration: none;
        transition: all 0.2s;
        line-height: 1;
    }

    .hero-ru-btn:hover {
        transform: translateY(-1px);
        box-shadow: 0 8px 24px rgba(0,0,0,0.3);
        filter: brightness(1.1);
    }

    .hero-ru-btn svg {
        flex-shrink: 0;
        margin: -2px 0;
    }

    .hero-ru-btn-tg {
        background: #0088cc;
    }

    .hero-ru-btn-max {
        background: linear-gradient(90deg, #395cf4 0%, #9751d6 100%);
    }

    @media (max-width: 480px) {
        .hero-ru-btns { flex-direction: column; }
        .hero-ru-btn { width: 100%; justify-content: center; }
    }

/* ── What is DeepSeek ── */
    .what-section {
        padding: 100px 24px;
        border-top: 1px solid var(--border);
        background: var(--bg);
    }

    .what-inner {
        max-width: 1100px;
        margin: 0 auto;
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 64px;
        align-items: center;
    }

    .what-left h2 {
        font-size: 36px;
        font-weight: 700;
        letter-spacing: -1.5px;
        line-height: 1.15;
        margin-bottom: 20px;
    }

    .what-left h2 span {
        background: linear-gradient(135deg, #1a1a2e 0%, #4D6BFE 100%);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }

    .what-left-subtitle {
        font-size: 16px;
        color: var(--text-secondary);
        line-height: 1.7;
        margin-bottom: 28px;
    }

    .what-stats {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 20px;
    }

    .what-stat {
        text-align: center;
        padding: 20px 12px;
        background: var(--bg-secondary);
        border: 1px solid var(--border);
        border-radius: var(--radius);
    }

    .what-stat-number {
        font-size: 28px;
        font-weight: 800;
        letter-spacing: -1px;
        line-height: 1;
        margin-bottom: 4px;
        color: #4D6BFE;
    }

    .what-stat-label {
        font-size: 12px;
        color: var(--text-tertiary);
        font-weight: 500;
        text-transform: uppercase;
        letter-spacing: 0.5px;
    }

    .what-right {
        font-size: 15px;
        color: var(--text-secondary);
        line-height: 1.85;
    }

    .what-right p { margin-bottom: 20px; }

    .what-right p:last-child { margin-bottom: 0; }

    .what-highlights {
        display: flex;
        flex-direction: column;
        gap: 14px;
        margin-top: 24px;
    }

    .what-highlight {
        display: flex;
        align-items: flex-start;
        gap: 12px;
        font-size: 14px;
        color: var(--text);
    }

    .what-highlight-icon {
        width: 22px;
        height: 22px;
        min-width: 22px;
        background: rgba(77,107,254,0.1);
        border-radius: 6px;
        display: flex;
        align-items: center;
        justify-content: center;
        margin-top: 1px;
    }

    .what-highlight-icon svg {
        width: 12px;
        height: 12px;
        color: #4D6BFE;
    }

    @media (max-width: 768px) {
        .what-inner {
            grid-template-columns: 1fr;
            gap: 40px;
        }
        .what-left h2 { font-size: 28px; }
        .what-stats { grid-template-columns: repeat(3, 1fr); gap: 12px; }
        .what-stat { padding: 16px 8px; }
        .what-stat-number { font-size: 22px; }
    }

    /* ── How To Use — horizontal timeline ── */
    .how-section {
        padding: 100px 24px;
        background: var(--bg);
        border-top: 1px solid var(--border);
    }

    .how-inner { max-width: 1100px; margin: 0 auto; }

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

    .how-header h2 {
        font-size: 36px;
        font-weight: 700;
        letter-spacing: -1.5px;
        margin-bottom: 12px;
    }

    .how-header p {
        font-size: 16px;
        color: var(--text-secondary);
    }

    .steps-timeline {
        display: flex;
        gap: 0;
        position: relative;
    }

    .steps-timeline::before {
        content: '';
        position: absolute;
        top: 24px;
        left: 24px;
        right: 24px;
        height: 2px;
        background: var(--border);
        z-index: 0;
    }

    .step-item {
        flex: 1;
        text-align: center;
        position: relative;
        z-index: 1;
        padding: 0 12px;
    }

    .step-dot {
        width: 48px;
        height: 48px;
        border-radius: 50%;
        background: var(--bg);
        border: 2px solid var(--border);
        display: flex;
        align-items: center;
        justify-content: center;
        margin: 0 auto 20px;
        font-size: 16px;
        font-weight: 800;
        color: var(--text);
        transition: all 0.3s;
    }

    .step-item:hover .step-dot {
        background: #4D6BFE;
        color: white;
        border-color: #4D6BFE;
        transform: scale(1.1);
    }

    .step-item h3 {
        font-size: 15px;
        font-weight: 600;
        margin-bottom: 6px;
    }

    .step-item p {
        font-size: 13px;
        color: var(--text-secondary);
        line-height: 1.5;
    }

    @media (max-width: 768px) {
        .steps-timeline {
            flex-direction: column;
            gap: 0;
        }
        .steps-timeline::before {
            top: 0;
            bottom: 0;
            left: 23px;
            right: auto;
            width: 2px;
            height: auto;
        }
        .step-item {
            display: flex;
            text-align: left;
            gap: 20px;
            padding: 0 0 32px 0;
        }
        .step-dot {
            margin: 0;
            min-width: 48px;
        }
        .step-item-text { padding-top: 10px; }
    }

    /* ── Features — bento grid ── */
    .features-section {
        padding: 100px 24px;
        background: #0a0f1e;
        color: #ffffff;
        position: relative;
        overflow: hidden;
    }

    .features-section::before {
        content: '';
        position: absolute;
        inset: 0;
        background-image:
            linear-gradient(rgba(77,107,254,0.03) 1px, transparent 1px),
            linear-gradient(90deg, rgba(77,107,254,0.03) 1px, transparent 1px);
        background-size: 64px 64px;
        pointer-events: none;
    }

    .features-inner { max-width: 1100px; margin: 0 auto; position: relative; z-index: 1; }

    .features-header {
        text-align: center;
        margin-bottom: 56px;
    }

    .features-header h2 {
        font-size: 36px;
        font-weight: 700;
        letter-spacing: -1.5px;
        margin-bottom: 12px;
        background: linear-gradient(180deg, #fff 40%, rgba(77,107,254,0.6) 100%);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }

    .features-header p {
        font-size: 16px;
        color: rgba(255,255,255,0.45);
    }

    .features-bento {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        grid-template-rows: auto auto;
        gap: 16px;
    }

    .feature-card {
        padding: 32px;
        background: rgba(77,107,254,0.06);
        border: 1px solid rgba(77,107,254,0.12);
        border-radius: 16px;
        text-decoration: none;
        color: inherit;
        display: flex;
        flex-direction: column;
        transition: background 0.2s, border-color 0.2s, transform 0.2s;
    }

    .feature-card:hover {
        background: rgba(77,107,254,0.12);
        border-color: rgba(77,107,254,0.25);
        transform: translateY(-2px);
    }

    /* First two cards span wider */

    .feature-icon {
        width: 44px;
        height: 44px;
        background: rgba(77,107,254,0.12);
        border: 1px solid rgba(77,107,254,0.2);
        border-radius: 12px;
        display: flex;
        align-items: center;
        justify-content: center;
        margin-bottom: 20px;
    }

    .feature-icon svg { width: 20px; height: 20px; color: rgba(255,255,255,0.8); }

    .feature-card h3 {
        font-size: 17px;
        font-weight: 600;
        margin-bottom: 8px;
        color: #ffffff;
    }

    .feature-card p {
        font-size: 14px;
        color: rgba(255,255,255,0.45);
        line-height: 1.6;
    }

    .feature-card .feature-arrow {
        margin-top: auto;
        padding-top: 20px;
        color: rgba(255,255,255,0.25);
        transition: color 0.2s;
    }

    .feature-card:hover .feature-arrow { color: rgba(77,107,254,0.8); }

    .feature-arrow svg { width: 18px; height: 18px; }

    @media (max-width: 768px) {
        .features-bento { grid-template-columns: 1fr; }
        .feature-card:nth-child(1),
        .feature-card:nth-child(4) { grid-column: span 1; }
    }

    /* ── Models — dark cards with glow ── */
    .models-section {
        padding: 100px 24px;
        background: var(--bg);
        border-top: 1px solid var(--border);
    }

    .models-inner { max-width: 1100px; margin: 0 auto; }

    .models-header {
        text-align: center;
        margin-bottom: 56px;
    }

    .models-header h2 {
        font-size: 36px;
        font-weight: 700;
        letter-spacing: -1.5px;
        margin-bottom: 12px;
    }

    .models-header p {
        font-size: 16px;
        color: var(--text-secondary);
    }

    .models-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 16px;
    }

    .model-card {
        padding: 28px;
        background: var(--bg);
        border: 1px solid var(--border);
        border-radius: 16px;
        transition: all 0.25s;
        position: relative;
        overflow: hidden;
    }

    .model-card::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        height: 3px;
        background: var(--border);
        transition: background 0.25s;
    }

    .model-card:hover {
        border-color: #4D6BFE;
        box-shadow: 0 8px 32px rgba(77,107,254,0.1);
        transform: translateY(-2px);
    }

    .model-card:hover::before {
        background: #4D6BFE;
    }

    .model-card-header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        margin-bottom: 12px;
    }

    .model-card h3 {
        font-size: 17px;
        font-weight: 700;
        display: flex;
        align-items: center;
        gap: 8px;
    }

    .model-badge {
        font-size: 10px;
        font-weight: 700;
        background: #4D6BFE;
        color: white;
        padding: 3px 8px;
        border-radius: 100px;
        text-transform: uppercase;
        letter-spacing: 0.5px;
    }

    .model-card p {
        font-size: 14px;
        color: var(--text-secondary);
        line-height: 1.6;
        margin-bottom: 20px;
        display: -webkit-box;
        -webkit-line-clamp: 3;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }

    .model-try {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        font-size: 13px;
        font-weight: 600;
        color: #4D6BFE;
        text-decoration: none;
        padding: 8px 16px;
        background: rgba(77,107,254,0.08);
        border-radius: 8px;
        transition: all 0.15s;
    }

    .model-try:hover {
        background: #4D6BFE;
        color: white;
    }

    .model-try svg { width: 14px; height: 14px; }

    @media (max-width: 900px) {
        .models-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 600px) {
        .models-grid { grid-template-columns: 1fr; }
    }

    /* ── FAQ — two-column layout ── */
    .faq-section {
        padding: 100px 24px;
        background: var(--bg-secondary);
        border-top: 1px solid var(--border);
    }

    .faq-inner {
        max-width: 1100px;
        margin: 0 auto;
        display: grid;
        grid-template-columns: 340px 1fr;
        gap: 64px;
        align-items: start;
    }

    .faq-left {
        position: sticky;
        top: 100px;
    }

    .faq-left h2 {
        font-size: 36px;
        font-weight: 700;
        letter-spacing: -1.5px;
        margin-bottom: 16px;
    }

    .faq-left p {
        font-size: 15px;
        color: var(--text-secondary);
        line-height: 1.6;
        margin-bottom: 24px;
    }

    .faq-left .faq-cta {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        padding: 12px 24px;
        font-size: 14px;
        font-weight: 600;
        background: #4D6BFE;
        color: white;
        border-radius: 10px;
        text-decoration: none;
        transition: all 0.15s;
    }

    .faq-left .faq-cta:hover {
        background: #3a58e0;
        transform: translateY(-1px);
    }

    .faq-left .faq-cta svg { width: 16px; height: 16px; }

    .faq-list { width: 100%; }

    .faq-item {
        background: var(--bg);
        border: 1px solid var(--border);
        border-radius: 14px;
        margin-bottom: 10px;
        overflow: hidden;
        transition: border-color 0.2s, box-shadow 0.2s;
    }

    .faq-item:hover {
        border-color: #b0bef0;
    }

    .faq-item.open {
        border-color: #4D6BFE;
        box-shadow: 0 4px 16px rgba(77,107,254,0.08);
    }

    .faq-question {
        width: 100%;
        background: none;
        border: none;
        padding: 20px 24px;
        font-size: 15px;
        font-weight: 600;
        font-family: inherit;
        text-align: left;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 16px;
        color: var(--text);
        transition: color 0.15s;
    }

    .faq-question svg {
        width: 18px;
        height: 18px;
        flex-shrink: 0;
        transition: transform 0.25s;
        color: var(--text-tertiary);
    }

    .faq-item.open .faq-question svg {
        transform: rotate(180deg);
        color: #4D6BFE;
    }

    .faq-answer {
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.35s ease;
    }

    .faq-item.open .faq-answer { max-height: 400px; }

    .faq-answer-inner {
        padding: 0 24px 20px;
        font-size: 14px;
        color: var(--text-secondary);
        line-height: 1.7;
    }

    @media (max-width: 768px) {
        .faq-inner {
            grid-template-columns: 1fr;
            gap: 40px;
        }
        .faq-left { position: static; text-align: center; }
        .faq-left h2 { font-size: 28px; }
    }

    /* ── CTA + Rating ── */
    .cta {
        padding: 120px 24px;
        text-align: center;
        border-top: none;
        background: #0a0f1e;
        color: #ffffff;
        position: relative;
        overflow: hidden;
    }

    .cta::before {
        content: '';
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        width: 600px;
        height: 400px;
        background: radial-gradient(ellipse, rgba(77,107,254,0.1) 0%, transparent 70%);
        pointer-events: none;
    }

    .cta-inner {
        position: relative;
        z-index: 1;
        max-width: 600px;
        margin: 0 auto;
        display: flex;
        flex-direction: column;
        align-items: center;
    }

    .cta h2 {
        font-size: 40px;
        font-weight: 800;
        letter-spacing: -1.5px;
        margin-bottom: 16px;
        background: linear-gradient(180deg, #ffffff 40%, rgba(77,107,254,0.6) 100%);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }

    .cta p {
        font-size: 16px;
        color: rgba(255,255,255,0.5);
        margin-bottom: 36px;
        line-height: 1.6;
    }

    .cta .btn-hero-primary {
        background: #4D6BFE;
        color: #ffffff;
        padding: 16px 36px;
        font-size: 16px;
        font-weight: 600;
        border-radius: 14px;
        border: none;
        cursor: pointer;
        transition: all 0.2s;
        text-decoration: none;
        display: inline-flex;
        align-items: center;
        gap: 10px;
        line-height: 1;
    }

    .cta .btn-hero-primary:hover {
        background: #3a58e0;
        transform: translateY(-1px);
        box-shadow: 0 8px 32px rgba(77,107,254,0.35);
    }

    /* Rating card */
    .rating-card {
        margin-top: 56px;
        display: inline-flex;
        flex-direction: column;
        align-items: center;
        gap: 16px;
        background: rgba(77,107,254,0.08);
        border: 1px solid rgba(77,107,254,0.15);
        border-radius: 20px;
        padding: 28px 40px;
        backdrop-filter: blur(8px);
    }

    .rating-label {
        font-size: 14px;
        font-weight: 500;
        color: rgba(255,255,255,0.5);
        letter-spacing: 0.3px;
    }

    .rating-stars {
        display: flex;
        gap: 6px;
    }

    .rating-star {
        width: 32px;
        height: 32px;
        cursor: pointer;
        transition: transform 0.15s;
        color: rgba(255,255,255,0.2);
        fill: rgba(255,255,255,0.2);
    }

    .rating-star.active {
        color: #facc15;
        fill: #facc15;
        filter: drop-shadow(0 0 6px rgba(250,204,21,0.4));
    }

    .rating-star:hover { transform: scale(1.15); }

    .rating-score {
        display: flex;
        align-items: center;
        gap: 8px;
    }

    .rating-number {
        font-size: 22px;
        font-weight: 700;
        color: #ffffff;
    }

    .rating-count {
        font-size: 13px;
        color: rgba(255,255,255,0.35);
    }

    .rating-thanks {
        font-size: 13px;
        color: #4D6BFE;
        font-weight: 500;
        animation: fadeIn 0.3s ease;
    }

    .rating-stars.voted .rating-star {
        pointer-events: none;
    }

    @keyframes fadeIn {
        from { opacity: 0; transform: translateY(4px); }
        to { opacity: 1; transform: translateY(0); }
    }

    @media (max-width: 640px) {
        .cta { padding: 80px 24px; }
        .cta h2 { font-size: 28px; }
        .rating-card { padding: 20px 24px; }
        .rating-star { width: 26px; height: 26px; }
    }