* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 72px;
}

body {
    font-family: "Google Sans Text", "Google Sans", -apple-system, sans-serif;
    color: #273043;
    background-color: #f2f2f2;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    font-size: clamp(14px, 1.1vw, 18px);
}

h1, h2, h3, .nav-cta, .step-number, .feature-name, .audience-role,
.modal-title, .beta-badge, .status-label, .fix-badge, .check-title,
.hero-btn {
    font-family: "Google Sans", "Google Sans Text", -apple-system, sans-serif;
}

/* Grid background */

body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: 0;
    background-image:
        linear-gradient(to right, rgba(0,0,0,0.06) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(0,0,0,0.06) 1px, transparent 1px);
    background-size: clamp(38px, 3.6vw, 67px) clamp(38px, 3.6vw, 67px);
    background-position: center center;
    mask-image: linear-gradient(to right,
        transparent 0%,
        black 8%,
        black 92%,
        transparent 100%
    );
    -webkit-mask-image: linear-gradient(to right,
        transparent 0%,
        black 8%,
        black 92%,
        transparent 100%
    );
    pointer-events: none;
}

body > *:not(dialog) {
    position: relative;
    z-index: 1;
}

.container {
    max-width: 100%;
    margin: 0;
    padding: 0 8vw;
}

/* Section card (shared podlozhka) */

.section-card {
    background: #fff;
    border-radius: clamp(20px, 2vw, 32px);
    padding: clamp(28px, 3vw, 56px) clamp(32px, 3.5vw, 64px);
    box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

/* Nav */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: clamp(12px, 1.2vw, 20px) 8vw;
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 100px;
    padding: clamp(10px, 0.8vw, 14px) clamp(10px, 0.8vw, 14px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
    border: 1px solid rgba(0, 0, 0, 0.06);
}

.nav-logo {
    margin-left: clamp(4px, 0.4vw, 8px);
}

.nav-logo img {
    height: clamp(16px, 1.5vw, 23px);
    display: block;
}

.nav-links {
    display: flex;
    gap: clamp(4px, 1vw, 12px);
}

.nav-links a {
    font-size: clamp(13px, 1vw, 16px);
    font-weight: 500;
    color: rgba(39, 48, 67, 0.55);
    text-decoration: none;
    padding: 6px 14px;
    border-radius: 100px;
    transition: background 0.2s, color 0.2s;
}

.nav-links a:hover {
    background: rgba(39, 48, 67, 0.05);
    color: #273043;
}

.nav-cta {
    font-size: clamp(13px, 1vw, 16px);
    font-weight: 500;
    color: #fff;
    background: #a674fe;
    border: none;
    cursor: pointer;
    padding: clamp(6px, 0.6vw, 12px) clamp(16px, 1.5vw, 28px);
    border-radius: 100px;
    transition: background 0.2s;
}

.nav-cta:hover {
    background: #b78aff;
}

/* Burger */

.nav-burger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 4px;
    width: 36px;
    height: 36px;
    padding: 8px;
    background: none;
    border: none;
    cursor: pointer;
}

.nav-burger span {
    display: block;
    height: 2px;
    background: #273043;
    border-radius: 2px;
    transition: transform 0.3s, opacity 0.3s;
}

.nav-mobile-overlay {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 99;
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

/* Hero */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: stretch;
    padding-top: clamp(72px, 6vw, 100px);
    padding-bottom: clamp(16px, 1.5vw, 24px);
}

.hero .container {
    display: flex;
    flex: 1;
}

.hero-card {
    border: 10px solid #fff;
    border-radius: clamp(20px, 2vw, 32px);
    background:
        radial-gradient(ellipse 35% 50% at 80% 70%, rgba(166, 116, 254, 0.6), transparent),
        radial-gradient(ellipse 30% 45% at 70% 110%, rgba(116, 146, 254, 0.6), transparent),
        #eef5ff;
    padding: clamp(24px, 3vw, 56px) clamp(24px, 3vw, 56px);
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.hero-content {
    display: grid;
    grid-template-columns: 3fr 2fr;
    align-items: center;
    gap: clamp(32px, 4vw, 72px);
}

.hero-chat {
    justify-self: center;
    width: clamp(220px, 22vw, 360px);
}

/* Hero alignment animation */

.hero-text {
    position: relative;
    flex: 1;
    min-width: 0;
}

.hero-align {
    position: relative;
    display: inline-block;
    animation: slide-title 4s ease 0.5s both;
    transform: translateX(8%);
}

/* PPT selection frame */

.hero-frame {
    position: absolute;
    inset: 0.05em -0.08em;
    border: 1.5px solid #4a86e8;
    pointer-events: none;
    opacity: 0;
    animation: frame-show 4s ease 0.5s both;
}

.hero-frame-handle {
    position: absolute;
    width: 8px;
    height: 8px;
    background: #fff;
    border: 1.5px solid #4a86e8;
}

.hero-frame-handle--tl { top: -4px; left: -4px; }
.hero-frame-handle--tc { top: -4px; left: 50%; margin-left: -4px; }
.hero-frame-handle--tr { top: -4px; right: -4px; }
.hero-frame-handle--ml { top: 50%; left: -4px; margin-top: -4px; }
.hero-frame-handle--mr { top: 50%; right: -4px; margin-top: -4px; }
.hero-frame-handle--bl { bottom: -4px; left: -4px; }
.hero-frame-handle--bc { bottom: -4px; left: 50%; margin-left: -4px; }
.hero-frame-handle--br { bottom: -4px; right: -4px; }

.hero h1 {
    font-size: clamp(48px, 8vw, 160px);
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.05;
    margin-bottom: clamp(24px, 3vw, 64px);
    margin-left: -0.04em;
    color: #273043;
}

.hero-cursor {
    position: absolute;
    width: clamp(20px, 2vw, 32px);
    height: clamp(20px, 2vw, 32px);
    top: 50%;
    left: 0;
    opacity: 0;
    pointer-events: none;
    filter: drop-shadow(0 1px 2px rgba(0,0,0,0.15));
    animation: cursor-move 4s ease 0.5s both;
}

.hero-guideline {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 1.5px;
    background: #ff3b30;
    opacity: 0;
    pointer-events: none;
    animation: guideline-flash 1s ease 3.1s both;
}

@keyframes slide-title {
    0%, 30% {
        transform: translateX(8%);
    }
    65%, 100% {
        transform: translateX(0);
    }
}

@keyframes cursor-move {
    0% {
        opacity: 0;
        transform: translate(900%, -300%);
    }
    /* appear from right */
    12% {
        opacity: 1;
        transform: translate(700%, -200%);
    }
    /* land on shifted title */
    24% {
        opacity: 1;
        transform: translate(450%, -100%);
    }
    /* click down */
    27% {
        opacity: 1;
        transform: translate(450%, -100%) scale(0.82);
    }
    /* hold — synced with title start at 30% */
    30% {
        opacity: 1;
        transform: translate(450%, -100%) scale(0.88);
    }
    /* dragging — synced with title end at 65% */
    65% {
        opacity: 1;
        transform: translate(100%, -100%) scale(0.88);
    }
    /* release */
    68% {
        opacity: 1;
        transform: translate(100%, -100%) scale(1);
    }
    /* drift away */
    85% {
        opacity: 0.5;
        transform: translate(-50%, -250%);
    }
    100% {
        opacity: 0;
        transform: translate(-100%, -300%);
    }
}

@keyframes guideline-flash {
    0% {
        opacity: 0;
        transform: scaleY(0);
    }
    30% {
        opacity: 1;
        transform: scaleY(1);
    }
    70% {
        opacity: 1;
        transform: scaleY(1);
    }
    100% {
        opacity: 0;
        transform: scaleY(1);
    }
}

@keyframes frame-show {
    0%, 24% {
        opacity: 0;
    }
    /* appear on cursor click */
    27% {
        opacity: 1;
    }
    /* stay during drag + guideline */
    78% {
        opacity: 1;
    }
    /* fade out */
    85%, 100% {
        opacity: 0;
    }
}

.hero .subtitle {
    font-size: clamp(18px, 1.6vw, 28px);
    font-weight: 400;
    color: rgba(39, 48, 67, 0.7);
    margin-bottom: 0.5em;
}

.hero .description {
    font-size: clamp(14px, 1.2vw, 20px);
    color: rgba(39, 48, 67, 0.5);
    max-width: 38em;
}

.hero-buttons {
    display: flex;
    gap: clamp(8px, 1vw, 16px);
    margin-top: clamp(40px, 5vw, 120px);
}

.hero-btn {
    font-size: clamp(14px, 1.1vw, 18px);
    font-weight: 500;
    padding: clamp(10px, 0.9vw, 16px) clamp(20px, 2vw, 36px);
    border-radius: 100px;
    border: none;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.2s;
}

.hero-btn--secondary {
    background: rgba(116, 146, 254, 0.15);
    color: #7492fe;
}

.hero-btn--secondary:hover {
    background: rgba(116, 146, 254, 0.25);
}

.hero-btn--primary {
    background: #a674fe;
    color: #fff;
}

.hero-btn--primary:hover {
    background: #b78aff;
}

/* Chat mockup */

.chat {
    display: flex;
    flex-direction: column;
    gap: clamp(4px, 0.4vw, 8px);
    font-size: clamp(11px, 0.85vw, 14px);
}

.chat-msg {
    display: flex;
    flex-direction: column;
    padding: clamp(8px, 0.7vw, 12px) clamp(10px, 0.9vw, 16px);
    border-radius: clamp(10px, 1vw, 16px);
    max-width: 92%;
    line-height: 1.4;
}

.chat-msg--user {
    align-self: flex-end;
    background: rgba(166, 116, 254, 0.1);
    border-bottom-right-radius: 4px;
}

.chat-msg--bot {
    align-self: flex-start;
    background: rgba(255, 255, 255, 0.85);
    border-bottom-left-radius: 4px;
}

.chat-bot-name {
    font-weight: 600;
    color: #a674fe;
    font-size: 0.85em;
    margin-bottom: 2px;
}

.chat-cmd {
    font-family: "SF Mono", "Fira Code", monospace;
    font-weight: 500;
    color: #a674fe;
}

.chat-text {
    color: #273043;
}

.chat-result {
    font-family: "SF Mono", "Fira Code", monospace;
    font-size: 0.9em;
    color: rgba(39, 48, 67, 0.6);
    margin-top: 4px;
}

.chat-result-pct {
    color: #34c759;
    font-weight: 600;
}

.chat-link {
    font-size: 0.9em;
    color: #7492fe;
    margin-top: 4px;
    word-break: break-all;
}

.chat-file {
    display: flex;
    align-items: center;
    gap: 6px;
}

.chat-file-icon {
    font-size: 1.1em;
}

.chat-file-name {
    font-weight: 500;
    color: #273043;
}

.chat-file-size {
    color: rgba(39, 48, 67, 0.4);
    font-size: 0.9em;
}

/* Features */

.features {
    padding: 0 0 clamp(16px, 1.5vw, 24px);
}

.features h2 {
    font-size: clamp(24px, 2.5vw, 48px);
    font-weight: 700;
    margin-bottom: clamp(24px, 2.5vw, 48px);
}

.status-group {
    margin-bottom: clamp(24px, 2.5vw, 48px);
}

.status-group:last-child {
    margin-bottom: 0;
}

.status-label {
    font-size: clamp(11px, 0.85vw, 14px);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: rgba(39, 48, 67, 0.3);
    margin-bottom: clamp(12px, 1.2vw, 20px);
    padding-left: 4px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.status-label::before {
    content: "";
    width: 0.7em;
    height: 0.7em;
    border-radius: 50%;
    flex-shrink: 0;
}

.status-label--stable::before {
    background: #34c759;
}

.status-label--experimental::before {
    background: #ffcc00;
}

.status-label--soon::before {
    background: #ff3b30;
}

.features-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: clamp(8px, 0.8vw, 16px);
}

/* Regular feature card */

.feature-card {
    padding: clamp(18px, 1.8vw, 32px);
    background: #f4f7fc;
    border-radius: clamp(12px, 1.2vw, 20px);
}

/* Hero feature card (check) */

.feature-card.feature-card--hero {
    grid-column: 1 / -1;
    background:
        radial-gradient(ellipse 40% 50% at 85% 80%, rgba(166, 116, 254, 0.15), transparent),
        radial-gradient(ellipse 35% 45% at 75% 20%, rgba(116, 146, 254, 0.12), transparent),
        #eef2fa;
    padding: clamp(20px, 2.2vw, 40px);
}

.feature-card--hero .feature-name {
    color: #273043;
    font-size: clamp(16px, 1.5vw, 26px);
}

.feature-card--hero .feature-desc {
    color: rgba(39, 48, 67, 0.5);
    margin-bottom: clamp(16px, 1.8vw, 32px);
}

.check-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: clamp(6px, 0.7vw, 12px);
}

.check-item {
    padding: clamp(10px, 1vw, 18px) clamp(12px, 1.1vw, 20px);
    background: rgba(255, 255, 255, 0.7);
    border-radius: clamp(10px, 1vw, 16px);
}

.check-title {
    font-size: clamp(12px, 0.95vw, 16px);
    font-weight: 500;
    margin-bottom: 4px;
    color: #273043;
}

.check-detail {
    font-size: clamp(11px, 0.85vw, 14px);
    color: rgba(39, 48, 67, 0.45);
    line-height: 1.45;
    max-width: 80%;
}

.fix-badge {
    display: inline-block;
    font-size: clamp(9px, 0.7vw, 12px);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: #a674fe;
    border: 1px solid rgba(166, 116, 254, 0.3);
    border-radius: 100px;
    padding: 2px 8px;
    margin-top: 8px;
}

.feature-name {
    font-size: clamp(14px, 1.2vw, 20px);
    font-weight: 500;
    margin-bottom: 6px;
    color: #273043;
}

.feature-desc {
    font-size: clamp(13px, 1vw, 16px);
    color: rgba(39, 48, 67, 0.5);
    line-height: 1.5;
    max-width: 70%;
}

/* How it works */

.how-it-works {
    padding: 0 0 clamp(16px, 1.5vw, 24px);
}

.how-it-works h2 {
    font-size: clamp(24px, 2.5vw, 48px);
    font-weight: 700;
    margin-bottom: clamp(24px, 2.5vw, 48px);
}

.steps {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: clamp(8px, 0.8vw, 16px);
}

.step {
    background: #f4f7fc;
    border-radius: clamp(12px, 1.2vw, 20px);
    padding: clamp(18px, 1.8vw, 32px);
}

.step-number {
    width: clamp(32px, 2.5vw, 44px);
    height: clamp(32px, 2.5vw, 44px);
    background: #a674fe;
    color: #fff;
    border: none;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: clamp(13px, 1vw, 17px);
    font-weight: 500;
    margin-bottom: clamp(12px, 1.2vw, 20px);
}

.step-title {
    font-size: clamp(14px, 1.1vw, 18px);
    font-weight: 500;
    margin-bottom: 6px;
    color: #273043;
}

.step-desc {
    font-size: clamp(12px, 0.95vw, 16px);
    color: rgba(39, 48, 67, 0.5);
    line-height: 1.5;
    max-width: 70%;
}

.features-cta {
    font-size: clamp(14px, 1.1vw, 18px);
    color: rgba(39, 48, 67, 0.5);
    margin-top: clamp(20px, 2vw, 36px);
    text-align: center;
}

.features-cta a {
    color: #a674fe;
    font-weight: 500;
    text-decoration: none;
    border-bottom: 1px solid rgba(166, 116, 254, 0.4);
    transition: border-color 0.2s;
}

.features-cta a:hover {
    border-color: #a674fe;
}

.footnote {
    font-size: clamp(12px, 0.9vw, 15px);
    color: rgba(39, 48, 67, 0.35);
    margin-top: 20px;
}

/* Audience */

.audience {
    padding: 0 0 clamp(16px, 1.5vw, 24px);
}

.audience h2 {
    font-size: clamp(24px, 2.5vw, 48px);
    font-weight: 700;
    margin-bottom: clamp(24px, 2.5vw, 48px);
}

.audience-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: clamp(8px, 0.8vw, 16px);
}

.audience-card {
    padding: clamp(18px, 1.8vw, 32px);
    background: #f4f7fc;
    border-radius: clamp(12px, 1.2vw, 20px);
}

.audience-role {
    font-size: clamp(14px, 1.2vw, 20px);
    font-weight: 500;
    margin-bottom: 6px;
    color: #273043;
}

.audience-desc {
    font-size: clamp(13px, 1vw, 16px);
    color: rgba(39, 48, 67, 0.5);
    line-height: 1.5;
    max-width: 70%;
}

/* Footer */

.footer {
    padding: 0 0 clamp(24px, 2vw, 40px);
}

.footer-card {
    text-align: center;
    background:
        radial-gradient(ellipse 30% 50% at -5% 80%, rgba(116, 146, 254, 0.5), transparent),
        radial-gradient(ellipse 25% 45% at 105% 20%, rgba(166, 116, 254, 0.5), transparent),
        #eef5ff;
    border: 10px solid #fff;
}

.beta-badge {
    display: inline-block;
    font-size: clamp(10px, 0.8vw, 13px);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: #7492fe;
    background: rgba(116, 146, 254, 0.15);
    border: none;
    border-radius: 100px;
    padding: 5px 16px;
    margin-bottom: 16px;
}

.footer-text {
    font-size: clamp(14px, 1.2vw, 20px);
    color: rgba(39, 48, 67, 0.5);
    margin-bottom: 24px;
}

.cta-link {
    display: inline-block;
    font-size: clamp(14px, 1.1vw, 18px);
    font-weight: 500;
    color: #fff;
    background: #a674fe;
    text-decoration: none;
    padding: clamp(10px, 0.9vw, 16px) clamp(20px, 2vw, 36px);
    border-radius: 100px;
    transition: background 0.2s;
}

.cta-link:hover {
    background: #b78aff;
}

/* Modal */

.modal {
    border: none;
    border-radius: 24px;
    padding: 0;
    max-width: 420px;
    width: calc(100% - 48px);
    background: #fff;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    margin: 0;
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.12);
}

.modal::backdrop {
    background: rgba(0, 0, 0, 0.35);
}

.modal-content {
    padding: 44px 36px;
    text-align: center;
    position: relative;
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 20px;
    background: none;
    border: none;
    font-size: 22px;
    color: rgba(39, 48, 67, 0.3);
    cursor: pointer;
    line-height: 1;
    padding: 4px;
    transition: color 0.2s;
}

.modal-close:hover {
    color: #273043;
}

.modal-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
    color: #273043;
}

.modal-text {
    font-size: 15px;
    color: rgba(39, 48, 67, 0.5);
    line-height: 1.5;
    margin-bottom: 24px;
}

.modal-cta {
    display: inline-block;
    font-size: 15px;
    font-weight: 500;
    color: #fff;
    background: #a674fe;
    text-decoration: none;
    padding: 12px 28px;
    border-radius: 100px;
    transition: background 0.2s;
}

.modal-cta:hover {
    background: #b78aff;
}

/* Check expand (mobile) */

.check-expand-input {
    display: none;
}

.check-expand-btn {
    display: none;
}

/* Responsive */

@media (max-width: 700px) {
    .hero {
        min-height: auto;
        padding: 80px 0 24px;
    }

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

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

    .nav-links,
    .nav-cta {
        display: none;
    }

    .nav-burger {
        display: flex;
    }

    .nav-inner.nav-open {
        border-radius: clamp(16px, 2vw, 24px);
        flex-wrap: wrap;
    }

    .nav-inner.nav-open .nav-links {
        display: flex;
        flex-direction: column;
        width: 100%;
        gap: 0;
        padding-top: 8px;
        order: 10;
    }

    .nav-inner.nav-open .nav-links a {
        padding: 10px 14px;
        font-size: 15px;
    }

    .nav-inner.nav-open .nav-cta {
        display: block;
        width: 100%;
        text-align: center;
        padding: 12px;
        margin-top: 4px;
        order: 11;
    }

    .nav-mobile-overlay.active {
        display: block;
    }

    /* Check grid collapse */
    .check-grid {
        max-height: 420px;
        overflow: hidden;
        position: relative;
        transition: max-height 0.4s ease;
    }

    .check-grid::after {
        content: "";
        position: absolute;
        bottom: 0;
        left: 0;
        right: 0;
        height: 80px;
        background: linear-gradient(to bottom, transparent, #eef2fa);
        pointer-events: none;
        transition: opacity 0.4s ease;
    }

    .check-expand-btn {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 4px;
        padding: 10px;
        margin-top: 8px;
        font-size: 14px;
        font-weight: 500;
        color: #a674fe;
        cursor: pointer;
    }

    .check-expand-arrow {
        width: 20px;
        height: 10px;
    }

    .check-expand-input:checked ~ .check-grid {
        max-height: 2000px;
    }

    .check-expand-input:checked ~ .check-grid::after {
        opacity: 0;
    }

    .check-expand-input:checked ~ .check-expand-btn {
        display: none;
    }

    .hero-content {
        display: block;
    }

    .hero-chat {
        display: none;
    }
}

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

@media (prefers-reduced-motion: reduce) {
    .hero-align {
        animation: none;
        transform: translateX(0);
    }
    .hero-cursor,
    .hero-guideline,
    .hero-frame {
        display: none;
    }
}