:root {
    color-scheme: light dark;
    --bg: #edf7ff;
    --fg: #162330;
    --surface: #ffffff;
    --surface-border: #bfd9ee;
    --surface-shadow: rgba(0, 0, 0, 0.08);
    --field-border: #b8c8d7;
    --link: #176da3;
    --btn-bg: #176da3;
    --btn-fg: #ffffff;
    --error: #9f1a1a;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0f1722;
        --fg: #dce6f2;
        --surface: #132031;
        --surface-border: #2c4158;
        --surface-shadow: rgba(0, 0, 0, 0.32);
        --field-border: #3b4f66;
        --link: #7fc7ff;
        --btn-bg: #2f89c8;
        --btn-fg: #f5fbff;
        --error: #ff9a9a;
    }
}

html[data-theme="light"] {
    --bg: #edf7ff;
    --fg: #162330;
    --surface: #ffffff;
    --surface-border: #bfd9ee;
    --surface-shadow: rgba(0, 0, 0, 0.08);
    --field-border: #b8c8d7;
    --link: #176da3;
    --btn-bg: #176da3;
    --btn-fg: #ffffff;
    --error: #9f1a1a;
}

html[data-theme="dark"] {
    --bg: #0f1722;
    --fg: #dce6f2;
    --surface: #132031;
    --surface-border: #2c4158;
    --surface-shadow: rgba(0, 0, 0, 0.32);
    --field-border: #3b4f66;
    --link: #7fc7ff;
    --btn-bg: #2f89c8;
    --btn-fg: #f5fbff;
    --error: #ff9a9a;
}

body.portal-page {
    font-family: Segoe UI, Tahoma, Arial, sans-serif;
    margin: 0;
    min-height: 100vh;
    background: var(--bg);
    color: var(--fg);
}

.portal-shell {
    width: min(980px, 95%);
    margin: 2rem auto;
    display: grid;
    gap: 1.15rem;
}

.card {
    background: var(--surface);
    border: 1px solid var(--surface-border);
    border-radius: 14px;
    box-shadow: 0 12px 30px var(--surface-shadow);
    padding: 1.6rem;
}

.card--narrow {
    width: min(560px, 100%);
    justify-self: center;
}

h1 {
    margin: 0 0 0.6rem;
    font-size: 1.7rem;
}

p {
    margin: 0.55rem 0;
    line-height: 1.45;
}

label {
    display: block;
    font-weight: 600;
}

input {
    width: 100%;
    margin-top: 0.3rem;
    margin-bottom: 0.8rem;
    padding: 0.55rem 0.65rem;
    border-radius: 8px;
    border: 1px solid var(--field-border);
    background: var(--surface);
    color: var(--fg);
    box-sizing: border-box;
}

a {
    color: var(--link);
}

code {
    font-family: Consolas, "Courier New", monospace;
}

.btn {
    display: inline-block;
    margin-top: 0.4rem;
    text-decoration: none;
    background: var(--btn-bg);
    color: var(--btn-fg);
    padding: 0.72rem 1rem;
    border-radius: 8px;
    font-weight: 600;
    border: none;
    cursor: pointer;
}

.error {
    color: var(--error);
    font-weight: 600;
}

.btn--ghost {
    background: transparent;
    color: var(--fg);
    border: 1px solid var(--surface-border);
}

.portal-tools {
    background: color-mix(in srgb, var(--surface) 88%, var(--bg));
    border: 1px solid var(--surface-border);
    border-radius: 12px;
    padding: 0.7rem 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.portal-tools__langs {
    display: flex;
    align-items: center;
    gap: 0.65rem;
}

.portal-tools__label {
    font-weight: 600;
}

.portal-tools__langs a {
    text-decoration: none;
    opacity: 0.85;
}

.portal-tools__langs a.is-active {
    font-weight: 700;
    text-decoration: underline;
    opacity: 1;
}

.portal-tools .btn {
    margin-top: 0;
}

.stack-form {
    margin-top: 1rem;
}

.top-bar {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}

.service-list {
    display: none;
}

.service-grid {
    margin-top: 1.2rem;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.15rem;
}

.service-tile {
    border: 1px solid var(--surface-border);
    border-radius: 12px;
    padding: 1.2rem;
    display: grid;
    gap: 0.75rem;
    align-content: start;
    min-height: 210px;
    background: color-mix(in srgb, var(--surface) 90%, var(--bg));
}

.service-tile__group {
    margin: 0;
    font-size: 0.8rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    opacity: 0.72;
}

.service-tile__title {
    margin: 0;
    font-size: 1.12rem;
    line-height: 1.35;
}

.service-tile .btn {
    margin-top: auto;
    width: fit-content;
}

@media (max-width: 980px) {
    .service-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 640px) {
    .portal-shell {
        width: min(94%, 100%);
        margin: 1rem auto;
    }

    .card {
        padding: 1.1rem;
    }

    .portal-tools {
        padding: 0.7rem 0.8rem;
    }

    .service-grid {
        grid-template-columns: 1fr;
        gap: 0.9rem;
    }

    .service-tile {
        min-height: 0;
        padding: 1rem;
    }
}

/* iPhone 14 Pro Max / 15 Plus (430 × 932 logical) and similar large iPhones */
@media (max-width: 430px) {
    .portal-shell {
        width: 100%;
        margin: 0.75rem auto;
        gap: 0.85rem;
        border-radius: 0;
    }

    .card {
        border-radius: 12px;
        padding: 1rem;
    }

    .portal-tools {
        border-radius: 10px;
        padding: 0.65rem 0.75rem;
        gap: 0.6rem;
    }

    .service-grid {
        gap: 0.75rem;
    }

    .service-tile {
        padding: 0.9rem;
    }
}

/* iPhone 14 Pro / 15 / 15 Pro (390 × 844 logical) and smaller iPhones */
@media (max-width: 390px) {
    h1 {
        font-size: 1.45rem;
    }

    .portal-tools__langs {
        gap: 0.5rem;
    }

    .service-tile__title {
        font-size: 1rem;
    }

    .btn {
        padding: 0.65rem 0.85rem;
        font-size: 0.9rem;
    }
}