:root {
    --blue: #124fc4;
    --blue-dark: #0b337d;
    --blue-soft: #eaf1ff;
    --orange: #f97316;
    --orange-dark: #d94e06;
    --ink: #14213a;
    --muted: #5d6980;
    --cream: #fffaf2;
    --white: #fff;
    --border: rgba(20, 33, 58, 0.11);
    --shadow: 0 24px 70px rgba(18, 79, 196, 0.14);
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    margin: 0;
    min-height: 100vh;
    color: var(--ink);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: linear-gradient(145deg, var(--cream), #f5f8ff 64%, #edf3ff);
}

a { color: inherit; }

.shell {
    width: min(1180px, calc(100% - 36px));
    margin: 0 auto;
}

.site-header {
    min-height: 92px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    color: var(--blue-dark);
    font-size: 1.05rem;
    font-weight: 800;
    text-decoration: none;
}

.logo-mark {
    display: inline-grid;
    place-items: center;
    min-width: 49px;
    height: 42px;
    padding: 0 8px;
    border-radius: 13px;
    color: var(--white);
    background: linear-gradient(145deg, var(--blue), var(--blue-dark));
    box-shadow: 0 11px 25px rgba(18, 79, 196, 0.24);
    letter-spacing: 0.06em;
}

.language-control select {
    appearance: none;
    min-width: 145px;
    padding: 10px 38px 10px 15px;
    border: 1px solid var(--border);
    border-radius: 999px;
    color: var(--ink);
    background: rgba(255,255,255,.84) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%2314213a' stroke-width='2'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E") no-repeat right 14px center;
    font: inherit;
    cursor: pointer;
}

.hero {
    min-height: 620px;
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(330px, .75fr);
    align-items: center;
    gap: clamp(24px, 4vw, 56px);
    padding: 58px 0 86px;
}

.eyebrow {
    margin: 0 0 14px;
    color: var(--orange-dark);
    font-size: .77rem;
    font-weight: 850;
    letter-spacing: .14em;
    text-transform: uppercase;
}

h1, h2, h3 { text-wrap: balance; }

h1 {
    max-width: 720px;
    margin: 0;
    font-size: clamp(3rem, 7.3vw, 6.7rem);
    line-height: .94;
    letter-spacing: -.058em;
}

.hero-lead {
    max-width: 620px;
    margin: 28px 0 0;
    color: var(--muted);
    font-size: clamp(1.05rem, 2vw, 1.27rem);
    line-height: 1.65;
}

.actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 32px;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 49px;
    padding: 0 22px;
    border-radius: 999px;
    font-weight: 760;
    text-decoration: none;
    transition: transform .16s ease, box-shadow .16s ease;
}

.button:hover { transform: translateY(-2px); }
.button.primary { color: #fff; background: linear-gradient(135deg, var(--orange), var(--orange-dark)); box-shadow: 0 14px 30px rgba(249,115,22,.28); }
.button.secondary { color: var(--blue-dark); border: 1px solid rgba(18,79,196,.2); background: rgba(255,255,255,.82); }

.conversation-card {
    position: relative;
    min-height: 460px;
    padding: 22px;
    border: 1px solid rgba(255,255,255,.8);
    border-radius: 32px;
    background: rgba(255,255,255,.78);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.card-top { display: flex; align-items: center; gap: 10px; padding-bottom: 23px; border-bottom: 1px solid var(--border); }
.avatar { display: grid; place-items: center; width: 38px; height: 38px; border-radius: 13px; color: #fff; background: var(--blue); font-weight: 850; }
.card-title { font-weight: 780; }

.message {
    position: relative;
    z-index: 1;
    width: fit-content;
    max-width: 80%;
    margin-top: 25px;
    padding: 13px 16px;
    border-radius: 18px 18px 18px 5px;
    color: var(--blue-dark);
    background: var(--blue-soft);
    line-height: 1.35;
}

.message.outgoing { margin-left: auto; color: #fff; border-radius: 18px 18px 5px 18px; background: linear-gradient(140deg, var(--blue), var(--blue-dark)); }
.message.short { margin-top: 18px; }
.compose-line { position: absolute; z-index: 1; left: 22px; right: 22px; bottom: 24px; height: 50px; display: flex; align-items: center; padding: 0 8px 0 18px; border: 1px solid var(--border); border-radius: 999px; background: #fff; }
.compose-line span { width: 40%; height: 7px; border-radius: 99px; background: #dce3ef; }
.compose-line i { width: 35px; height: 35px; margin-left: auto; border-radius: 50%; background: var(--orange); }

.encryption-video {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(170px, 42%);
    align-items: center;
    gap: 24px;
    margin-top: 38px;
    padding: 26px;
    border: 1px solid rgba(255,255,255,.1);
    border-radius: 26px;
    color: #fff;
    background: radial-gradient(ellipse at 15% 10%, rgba(18,79,196,.28), transparent 55%), #09111f;
    box-shadow: 0 22px 55px rgba(9,17,31,.18);
}
.encryption-video .eyebrow { color: #ffc498; }
.encryption-video h2 { margin: 0; font-size: clamp(1.5rem, 2.6vw, 2.45rem); line-height: 1.1; letter-spacing: -.035em; hyphens: auto; overflow-wrap: anywhere; }
.encryption-video-copy > p:last-child { margin: 18px 0 0; color: rgba(255,255,255,.76); line-height: 1.6; }
.encryption-player { position: relative; width: 100%; overflow: hidden; aspect-ratio: 9 / 16; border: 1px solid rgba(255,255,255,.15); border-radius: 18px; background: #03060b; box-shadow: 0 16px 35px rgba(0,0,0,.3); }
.encryption-player video { display: block; width: 100%; height: 100%; object-fit: cover; }
.encryption-player-fullscreen { position: absolute; inset: 0; display: none; align-items: flex-end; justify-content: flex-end; padding: 12px; border: 0; color: #fff; background: linear-gradient(180deg, transparent 55%, rgba(0,0,0,.7)); font: inherit; font-size: .84rem; font-weight: 720; text-align: left; cursor: pointer; }
.encryption-player.is-ready .encryption-player-fullscreen { display: flex; }
.fullscreen-pill { display: inline-flex; align-items: center; gap: 8px; padding: 9px 11px; border: 1px solid rgba(255,255,255,.4); border-radius: 999px; background: rgba(10,15,24,.78); backdrop-filter: blur(8px); }
.fullscreen-icon { display: inline-block; width: 13px; height: 13px; border: 2px solid currentColor; border-radius: 2px; opacity: .95; }
.encryption-player-fullscreen:focus-visible { outline: 3px solid #ffc498; outline-offset: -5px; }
.encryption-player-fullscreen:hover .fullscreen-pill { background: rgba(18,79,196,.9); }

.features { padding: 88px 0; border-top: 1px solid var(--border); }
.section-heading { max-width: 700px; }
.section-heading h2, .privacy-card h2 { margin: 0; font-size: clamp(2rem, 4.6vw, 4rem); line-height: 1.03; letter-spacing: -.045em; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 46px; }
.feature-grid article { padding: 26px; border: 1px solid var(--border); border-radius: 24px; background: rgba(255,255,255,.64); }
.feature-grid h3 { margin: 0 0 10px; font-size: 1.18rem; }
.feature-grid p { margin: 0; color: var(--muted); line-height: 1.58; }

.privacy-card {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 34px 70px;
    margin: 30px 0 98px;
    padding: clamp(28px, 5vw, 60px);
    border-radius: 34px;
    color: #fff;
    background: linear-gradient(135deg, var(--blue), var(--blue-dark));
    box-shadow: 0 28px 70px rgba(18,79,196,.24);
}
.privacy-card .eyebrow { color: #ffc498; }
.privacy-card > p { margin: 0; color: rgba(255,255,255,.8); line-height: 1.7; }
.privacy-card > a { grid-column: 2; width: fit-content; font-weight: 760; text-underline-offset: 5px; }

footer { min-height: 100px; display: flex; align-items: center; justify-content: space-between; gap: 20px; border-top: 1px solid var(--border); color: var(--muted); font-size: .88rem; }
footer nav { display: flex; flex-wrap: wrap; gap: 18px; }
footer a { text-underline-offset: 4px; }

.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

@media (max-width: 820px) {
    .hero { grid-template-columns: 1fr; padding-top: 45px; }
    .conversation-card { width: min(100%, 520px); min-height: 410px; }
    .encryption-video { grid-template-columns: minmax(0, 1fr) minmax(200px, 300px); }
    .feature-grid { grid-template-columns: 1fr; }
    .privacy-card { grid-template-columns: 1fr; }
    .privacy-card > a { grid-column: 1; }
}

@media (max-width: 520px) {
    .shell { width: min(100% - 24px, 1180px); }
    .site-header { min-height: 76px; }
    .logo > span:last-child { display: none; }
    .language-control select { min-width: 132px; }
    .hero { min-height: 0; gap: 30px; padding-bottom: 64px; }
    h1 { font-size: clamp(2.9rem, 15vw, 4.4rem); }
    .actions, .button { width: 100%; }
    .conversation-card { min-height: 390px; padding: 17px; border-radius: 25px; }
    .compose-line { left: 17px; right: 17px; bottom: 18px; }
    .encryption-video { grid-template-columns: 1fr; justify-items: center; gap: 20px; padding: 22px; border-radius: 25px; }
    .encryption-video-copy { width: 100%; }
    .encryption-player { order: -1; width: min(100%, 310px); }
    .features { padding: 68px 0; }
    .privacy-card { margin-bottom: 70px; border-radius: 25px; }
    footer { padding: 28px 0; align-items: flex-start; flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}