:root {
    --navy: #061324;
    --navy-light: #0c2038;
    --blue: #1876dc;
    --cyan: #54d8ff;
    --ink: #14243b;
    --muted: #5d6b7e;
    --line: #d8e2ed;
    --soft: #f3f7fb;
    --white: #ffffff;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: var(--ink);
    background: #eaf0f6;
    font-family: Inter, "Segoe UI", Arial, sans-serif;
}

a {
    color: inherit;
}

.site-header {
    min-height: 72px;
    padding: 0 max(5vw, calc((100vw - 1280px) / 2));
    display: flex;
    align-items: center;
    justify-content: space-between;
    color: var(--white);
    background: var(--navy);
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.site-header a {
    text-decoration: none;
}

.brand {
    font-size: 16px;
    font-weight: 800;
    letter-spacing: 0.03em;
}

.site-header nav {
    display: flex;
    align-items: center;
    gap: 24px;
    color: #c7d6e8;
    font-size: 13px;
}

.language-switch {
    display: flex;
    align-items: center;
    gap: 4px;
}

.language-switch a {
    min-width: 30px;
    padding: 7px 6px;
    color: #91a8c2;
    text-align: center;
    border-radius: 4px;
    font-size: 10px;
    font-weight: 800;
}

.language-switch a:hover,
.language-switch a.active {
    color: var(--white);
    background: rgba(255, 255, 255, 0.13);
}

.download-link {
    padding: 10px 14px;
    color: var(--white);
    background: var(--blue);
    border-radius: 5px;
    font-weight: 700;
}

.page-intro {
    padding: 80px 5vw 70px;
    color: var(--white);
    text-align: center;
    background:
        radial-gradient(circle at 50% 0, rgba(24, 118, 220, 0.34), transparent 45%),
        var(--navy);
}

.page-intro p,
.page-intro h1,
.page-intro span {
    margin: 0;
}

.page-intro p {
    color: var(--cyan);
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

.page-intro h1 {
    margin: 12px 0 14px;
    font-size: clamp(50px, 8vw, 92px);
    line-height: 1;
    letter-spacing: -0.055em;
}

.page-intro span {
    color: #c9d7e8;
    font-size: clamp(17px, 2vw, 24px);
}

.presentation-flow {
    width: min(1280px, 92vw);
    margin: 0 auto;
    padding: 72px 0 110px;
}

.slide-section {
    margin-bottom: 88px;
}

.slide-section:last-child {
    margin-bottom: 0;
}

.slide-heading {
    margin-bottom: 18px;
    display: flex;
    align-items: baseline;
    gap: 16px;
}

.slide-heading span {
    color: var(--blue);
    font-size: 12px;
    font-weight: 850;
}

.slide-heading h2 {
    margin: 0;
    font-size: clamp(22px, 3vw, 34px);
    letter-spacing: -0.025em;
}

.slide-frame {
    margin: 0;
    overflow: hidden;
    background: var(--navy);
    border: 1px solid rgba(6, 19, 36, 0.28);
    border-radius: 10px;
    box-shadow: 0 24px 54px rgba(13, 37, 65, 0.17);
}

.slide-frame img {
    display: block;
    width: 100%;
    height: auto;
}

.slide-note {
    position: relative;
    width: 100%;
    margin: 0;
    padding: 42px 48px 44px;
    background: var(--white);
    border: 1px solid var(--line);
    border-top: 4px solid var(--blue);
    border-radius: 0 0 10px 10px;
    box-shadow: 0 18px 40px rgba(13, 37, 65, 0.1);
}

.note-label {
    margin: 0 0 8px;
    color: var(--blue);
    font-size: 10px;
    font-weight: 850;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

.slide-note h3 {
    margin: 0 0 24px;
    color: var(--ink);
    font-size: clamp(25px, 3vw, 38px);
    line-height: 1.15;
    letter-spacing: -0.03em;
}

.slide-note > p:not(.note-label) {
    margin: 0 0 16px;
    color: var(--muted);
    font-size: 16px;
    line-height: 1.75;
}

.slide-note > p:last-child {
    margin-bottom: 0;
}

blockquote {
    margin: 26px 0;
    padding: 22px 26px;
    color: #304a67;
    background: var(--soft);
    border-left: 4px solid var(--cyan);
}

blockquote p {
    margin: 5px 0;
    font-size: 14px;
    font-weight: 650;
}

.slide-note .closing-note {
    margin-top: 28px;
    padding: 20px 24px;
    color: var(--white);
    background: var(--navy-light);
    border-radius: 7px;
    font-size: 18px;
    font-weight: 700;
}

.final-call {
    padding: 72px max(5vw, calc((100vw - 1180px) / 2));
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
    color: var(--white);
    background: linear-gradient(120deg, var(--blue), #10499c);
}

.final-call p,
.final-call h2 {
    margin: 0;
}

.final-call p {
    margin-bottom: 8px;
    color: #cce8ff;
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.final-call h2 {
    font-size: clamp(26px, 4vw, 42px);
}

.final-call a {
    flex: 0 0 auto;
    padding: 15px 21px;
    color: var(--blue);
    background: var(--white);
    border-radius: 6px;
    font-size: 13px;
    font-weight: 800;
    text-decoration: none;
}

footer {
    padding: 28px 5vw;
    display: flex;
    justify-content: space-between;
    gap: 24px;
    color: #91a3ba;
    background: var(--navy);
    font-size: 12px;
}

footer p {
    margin: 0;
}

@media (max-width: 720px) {
    .site-header {
        padding-top: 18px;
        padding-bottom: 18px;
        align-items: flex-start;
        flex-direction: column;
        gap: 16px;
    }

    .site-header nav {
        width: 100%;
        flex-wrap: wrap;
        gap: 12px;
    }

    .language-switch {
        margin-right: auto;
    }

    .presentation-flow {
        width: min(100% - 24px, 1280px);
        padding-top: 48px;
    }

    .slide-section {
        margin-bottom: 58px;
    }

    .slide-heading {
        padding: 0 4px;
    }

    .slide-frame {
        border-radius: 6px;
    }

    .slide-note {
        width: 100%;
        padding: 30px 24px 32px;
    }

    .slide-note > p:not(.note-label) {
        font-size: 15px;
    }

    .final-call,
    footer {
        align-items: flex-start;
        flex-direction: column;
    }
}