* {
    box-sizing: border-box;
}

:root {
    --bg-top: #dff3ff;
    --bg-bottom: #b9ddf4;
    --text-main: #17324a;
    --text-soft: #55758d;
    --card-bg: rgba(238, 247, 255, 0.72);
    --card-border: rgba(173, 208, 233, 0.72);
    --card-shadow: rgba(71, 126, 170, 0.14);
    --glow: rgba(116, 186, 235, 0.30);
    --white: rgba(255, 255, 255, 0.82);
}

html,
body {
    width: 100%;
    height: 100%;
    margin: 0;
    overflow: hidden;
}

body {
    font-family:
        "SF Pro Display",
        "SF Pro Text",
        "Segoe UI",
        "Inter",
        "Helvetica Neue",
        Arial,
        sans-serif;
    color: var(--text-main);
    background:
        radial-gradient(circle at top center, rgba(255, 255, 255, 0.65), transparent 30%),
        radial-gradient(circle at 20% 20%, rgba(180, 226, 255, 0.85), transparent 25%),
        linear-gradient(180deg, var(--bg-top) 0%, var(--bg-bottom) 100%);
}

a {
    color: inherit;
    text-decoration: none;
}

.page {
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.screen {
    width: 100%;
    height: 100%;
    max-width: 520px;
    margin: 0 auto;
    padding: 28px 22px 22px;
    display: grid;
    grid-template-rows: auto 1fr;
    gap: 10px;
}

.topbar {
    display: flex;
    align-items: flex-start;
    justify-content: flex-start;
    min-height: 40px;
}

.brand {
    font-size: clamp(28px, 4vw, 38px);
    font-weight: 800;
    font-style: italic;
    letter-spacing: 0.03em;
    color: #111111;
}

.hero {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.hero__bird-wrap {
    position: relative;
    width: 172px;
    height: 172px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 18px;
}

.hero__glow {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    background:
        radial-gradient(circle, var(--glow) 0%, rgba(116, 186, 235, 0.14) 48%, transparent 74%);
    filter: blur(10px);
}

.hero__bird-image {
    position: relative;
    z-index: 1;
    width: 152px;
    height: 152px;
    object-fit: cover;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.30);
    border: 1px solid rgba(201, 227, 245, 0.95);
    box-shadow:
        0 18px 40px rgba(79, 137, 179, 0.18),
        inset 0 1px 0 rgba(255, 255, 255, 0.65);
}

.hero__title {
    font-size: clamp(24px, 4vw, 34px);
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 10px;
    color: #17324a;
}

.hero__subtitle {
    max-width: 360px;
    font-size: clamp(16px, 2.3vw, 20px);
    line-height: 1.35;
    color: var(--text-soft);
    font-weight: 500;
    margin-bottom: 18px;
}

.cards-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    align-content: start;
    padding-top: 8px;
}

.card,
.info-card,
.panel,
.option-item,
.accordion {
    border: 1px solid var(--card-border);
    border-radius: 26px;
    background:
        linear-gradient(180deg, rgba(248, 252, 255, 0.88), var(--card-bg));
    box-shadow:
        0 16px 34px var(--card-shadow),
        inset 0 1px 0 rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(10px);
}

.card {
    min-height: 150px;
    padding: 18px 16px;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    transition:
        transform 0.15s ease,
        box-shadow 0.15s ease,
        border-color 0.15s ease;
}

.card:hover {
    transform: translateY(-2px);
    border-color: rgba(135, 190, 226, 0.95);
}

.card__title {
    font-size: clamp(18px, 2.6vw, 24px);
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 10px;
    color: #1c3950;
}

.card__subtitle {
    font-size: clamp(14px, 2vw, 18px);
    line-height: 1.35;
    color: var(--text-soft);
    font-weight: 600;
}

.section-head {
    margin-bottom: 14px;
}

.section-title {
    font-size: 30px;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 6px;
}

.section-subtitle {
    font-size: 16px;
    color: var(--text-soft);
    font-weight: 600;
}

.panel-stack {
    display: grid;
    gap: 12px;
}

.panel-stack--small-top {
    margin-top: 12px;
}

.panel {
    padding: 16px;
}

.panel--accent {
    background:
        linear-gradient(180deg, rgba(234, 246, 255, 0.95), rgba(220, 239, 252, 0.82));
}

.panel__label {
    font-size: 13px;
    color: var(--text-soft);
    font-weight: 700;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.panel__value {
    font-size: 22px;
    font-weight: 800;
    margin-bottom: 8px;
}

.panel__text {
    font-size: 15px;
    line-height: 1.4;
    color: #29465b;
}

.info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.info-card {
    padding: 16px;
}

.info-card__label {
    font-size: 13px;
    color: var(--text-soft);
    font-weight: 700;
    margin-bottom: 8px;
}

.info-card__value {
    font-size: 18px;
    line-height: 1.3;
    font-weight: 800;
}

.accordion-list {
    display: grid;
    gap: 12px;
}

.accordion {
    padding: 0;
    overflow: hidden;
}

.accordion[open] {
    background:
        linear-gradient(180deg, rgba(244, 251, 255, 0.95), rgba(231, 245, 255, 0.82));
}

.accordion__summary {
    list-style: none;
    cursor: pointer;
    padding: 18px 18px 16px;
    font-size: 17px;
    font-weight: 800;
}

.accordion__summary::-webkit-details-marker {
    display: none;
}

.accordion__content {
    padding: 0 18px 16px;
    color: #29465b;
    font-size: 15px;
    line-height: 1.45;
}

.accordion__content p {
    margin: 0 0 8px;
}

.option-list {
    display: grid;
    gap: 12px;
}

.option-item {
    padding: 18px;
    font-size: 17px;
    font-weight: 700;
}

.option-item--muted {
    color: var(--text-soft);
}

@media (max-width: 560px) {
    .screen {
        max-width: 100%;
        padding: 24px 18px 18px;
    }

    .hero__bird-wrap {
        width: 148px;
        height: 148px;
        margin-bottom: 14px;
    }

    .hero__bird-image {
        width: 132px;
        height: 132px;
    }

    .cards-grid,
    .info-grid {
        gap: 12px;
    }

    .card,
    .info-card,
    .panel,
    .option-item {
        border-radius: 22px;
    }

    .card {
        min-height: 135px;
        padding: 16px 14px;
    }

    .card__title {
        font-size: 17px;
    }

    .card__subtitle,
    .panel__text,
    .accordion__content,
    .option-item {
        font-size: 14px;
    }
}

.topbar__left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.back-button {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: rgba(248, 252, 255, 0.65);
    border: 1px solid rgba(173, 208, 233, 0.72);
    color: #17324a;
    font-size: 22px;
    font-weight: 700;
    line-height: 1;
    box-shadow:
        0 8px 18px rgba(71, 126, 170, 0.10),
        inset 0 1px 0 rgba(255, 255, 255, 0.75);
}