:root {
    --navy-950: #071c35;
    --navy-900: #0a2a50;
    --navy-800: #103d70;
    --navy-700: #17528f;
    --blue-50: #f3f7fc;
    --blue-100: #e7f0fa;
    --green-700: #127347;
    --green-100: #e8f7ef;
    --orange-700: #b85b08;
    --orange-100: #fff2df;
    --gray-700: #536274;
    --gray-500: #7c8998;
    --gray-300: #cbd3dc;
    --gray-200: #e5eaf0;
    --gray-100: #f4f6f8;
    --white: #ffffff;
    --shadow: 0 18px 50px rgba(7, 28, 53, 0.08);
}

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

html {
    scroll-behavior: smooth;
}

body {
    min-width: 320px;
    min-height: 100vh;
    background: #f8fafc;
    color: var(--navy-950);
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

button,
a {
    -webkit-tap-highlight-color: transparent;
}

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

button {
    font: inherit;
}

.page-shell {
    width: min(1120px, calc(100% - 40px));
    margin: 0 auto;
    padding: 48px 0 24px;
}

.brand-hero {
    position: relative;
    overflow: hidden;
    padding: 44px;
    border: 1px solid #dfe7f0;
    border-radius: 28px;
    background: var(--white);
    box-shadow: var(--shadow);
}

.brand-hero::after {
    content: '';
    position: absolute;
    right: -80px;
    top: -100px;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(23, 82, 143, 0.12), transparent 68%);
    pointer-events: none;
}

.brand-heading {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    gap: 18px;
    margin-bottom: 30px;
}

.pineapple-mark {
    display: grid;
    width: 66px;
    height: 66px;
    flex: 0 0 auto;
    place-items: center;
    border-radius: 20px;
    background: var(--navy-900);
    color: #f5bd43;
}

.pineapple-mark svg {
    width: 42px;
    height: 42px;
}

.brand-kicker {
    margin-bottom: 4px;
    color: var(--navy-700);
    font-size: 14px;
    font-weight: 800;
    letter-spacing: 0.08em;
}

.brand-heading h1 {
    color: var(--navy-950);
    font-size: clamp(28px, 4vw, 44px);
    line-height: 1.15;
    letter-spacing: -0.04em;
}

.official-entry {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 30px;
    padding: 26px 28px;
    border-radius: 20px;
    background: linear-gradient(135deg, var(--navy-950), var(--navy-800));
    color: var(--white);
}

.official-copy {
    min-width: 0;
}

.section-label {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--navy-700);
    font-size: 14px;
    font-weight: 800;
}

.official-entry .section-label {
    margin-bottom: 8px;
    color: #bcd4ee;
}

.section-label svg {
    width: 21px;
    height: 21px;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.8;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.official-url {
    display: block;
    overflow: hidden;
    color: var(--white);
    font-family: "SFMono-Regular", Consolas, monospace;
    font-size: clamp(20px, 3vw, 30px);
    font-weight: 800;
    letter-spacing: -0.02em;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.official-url:hover,
.official-url:focus-visible {
    text-decoration: underline;
    text-underline-offset: 5px;
}

.official-actions {
    display: flex;
    flex: 0 0 auto;
    gap: 12px;
}

.primary-button,
.secondary-button {
    display: inline-flex;
    min-height: 48px;
    align-items: center;
    justify-content: center;
    padding: 0 22px;
    border: 1px solid transparent;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 800;
    cursor: pointer;
    transition: transform 0.18s ease, background 0.18s ease, border-color 0.18s ease;
}

.primary-button {
    background: var(--white);
    color: var(--navy-900);
}

.secondary-button {
    border-color: rgba(255, 255, 255, 0.34);
    background: transparent;
    color: var(--white);
}

.primary-button:hover,
.secondary-button:hover,
.primary-button:focus-visible,
.secondary-button:focus-visible {
    transform: translateY(-2px);
}

.secondary-button:hover,
.secondary-button:focus-visible {
    background: rgba(255, 255, 255, 0.1);
}

.brand-intro {
    position: relative;
    z-index: 1;
    margin-top: 24px;
    color: #43556a;
    font-size: 17px;
    font-weight: 500;
}

.groups-section {
    padding: 64px 0 30px;
}

.groups-heading {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 22px;
}

.groups-heading h2 {
    margin-top: 6px;
    font-size: clamp(25px, 3vw, 34px);
    line-height: 1.2;
}

.groups-heading > p {
    color: var(--gray-500);
    font-size: 14px;
}

.status-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 26px;
}

.filter-button {
    min-height: 46px;
    padding: 0 18px;
    border: 1px solid var(--gray-200);
    border-radius: 12px;
    background: var(--white);
    color: #43556a;
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

.filter-button:hover,
.filter-button:focus-visible {
    border-color: var(--navy-700);
    transform: translateY(-1px);
}

.filter-button.is-active {
    border-color: var(--navy-900);
    background: var(--navy-900);
    color: var(--white);
}

.groups-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
}

.group-card {
    position: relative;
    overflow: hidden;
    min-width: 0;
    padding: 26px;
    border: 1px solid;
    border-radius: 20px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.group-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 16px 38px rgba(7, 28, 53, 0.08);
}

.group-card--available {
    border-color: #c8e8d7;
    background: linear-gradient(145deg, var(--white), var(--green-100));
}

.group-card--warning {
    border-color: #f2d0a7;
    background: linear-gradient(145deg, var(--white), var(--orange-100));
}

.group-card--full {
    border-color: var(--gray-200);
    background: var(--gray-100);
    color: var(--gray-700);
    box-shadow: none;
}

.group-card--full:hover {
    transform: none;
    box-shadow: none;
}

.scarcity-badge {
    position: absolute;
    top: 0;
    right: 0;
    padding: 7px 14px;
    border-bottom-left-radius: 12px;
    background: var(--orange-700);
    color: var(--white);
    font-size: 12px;
    font-weight: 800;
}

.group-card-heading {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 14px;
    padding-right: 2px;
}

.group-status-text {
    margin-bottom: 4px;
    color: var(--green-700);
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.08em;
}

.group-card--warning .group-status-text {
    color: var(--orange-700);
}

.group-card--full .group-status-text {
    color: var(--gray-500);
}

.group-card-heading h3 {
    overflow: hidden;
    font-size: 21px;
    line-height: 1.3;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.status-pill {
    flex: 0 0 auto;
    padding: 5px 10px;
    border-radius: 999px;
    background: #d7f1e3;
    color: var(--green-700);
    font-size: 12px;
    font-weight: 800;
}

.group-card--warning .status-pill {
    background: #ffe3bd;
    color: var(--orange-700);
}

.group-card--full .status-pill {
    background: #e2e6eb;
    color: var(--gray-700);
}

.group-number-row {
    display: flex;
    align-items: baseline;
    gap: 12px;
    margin: 24px 0 18px;
}

.group-number-row span,
.member-row span {
    color: var(--gray-500);
    font-size: 13px;
    font-weight: 600;
}

.group-number-row strong {
    color: var(--navy-900);
    font-family: "SFMono-Regular", Consolas, monospace;
    font-size: 20px;
    letter-spacing: 0.04em;
}

.group-card--full .group-number-row strong {
    color: var(--gray-700);
}

.member-row {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 16px;
}

.member-row > div {
    display: flex;
    align-items: baseline;
    gap: 10px;
}

.member-row strong {
    font-family: "SFMono-Regular", Consolas, monospace;
    font-size: 17px;
}

.member-row > span {
    font-family: "SFMono-Regular", Consolas, monospace;
}

.member-progress {
    height: 7px;
    margin-top: 10px;
    overflow: hidden;
    border-radius: 999px;
    background: rgba(18, 115, 71, 0.13);
}

.member-progress span {
    display: block;
    height: 100%;
    border-radius: inherit;
    background: var(--green-700);
}

.group-card--warning .member-progress {
    background: rgba(184, 91, 8, 0.14);
}

.group-card--warning .member-progress span {
    background: var(--orange-700);
}

.group-card--full .member-progress {
    background: #dce1e6;
}

.group-card--full .member-progress span {
    background: #9aa5b1;
}

.group-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-top: 24px;
}

.group-button {
    display: inline-flex;
    min-height: 48px;
    align-items: center;
    justify-content: center;
    padding: 0 16px;
    border: 1px solid;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 800;
    cursor: pointer;
    transition: transform 0.18s ease, background 0.18s ease;
}

.group-button:hover:not(:disabled):not(.is-disabled),
.group-button:focus-visible:not(:disabled):not(.is-disabled) {
    transform: translateY(-2px);
}

.group-button--copy {
    border-color: #a9d7be;
    background: var(--white);
    color: var(--green-700);
}

.group-button--join {
    border-color: var(--green-700);
    background: var(--green-700);
    color: var(--white);
}

.group-card--warning .group-button--copy {
    border-color: #efc28c;
    color: var(--orange-700);
}

.group-card--warning .group-button--join {
    border-color: var(--orange-700);
    background: var(--orange-700);
}

.group-button:disabled,
.group-button.is-disabled {
    border-color: var(--gray-300);
    background: #e1e5e9;
    color: #7c8793;
    cursor: not-allowed;
    pointer-events: none;
}

.empty-state {
    padding: 56px 20px;
    border: 1px dashed var(--gray-300);
    border-radius: 18px;
    background: var(--white);
    text-align: center;
}

.empty-state h3 {
    margin-bottom: 5px;
    font-size: 18px;
}

.empty-state p {
    color: var(--gray-500);
    font-size: 14px;
}

.site-footer {
    width: min(1120px, calc(100% - 40px));
    margin: 0 auto;
    padding: 20px 0 calc(30px + env(safe-area-inset-bottom));
    color: var(--gray-500);
    font-size: 13px;
    text-align: center;
}

.copy-toast {
    position: fixed;
    bottom: calc(28px + env(safe-area-inset-bottom));
    left: 50%;
    z-index: 20;
    min-width: 120px;
    padding: 11px 18px;
    border-radius: 999px;
    background: rgba(7, 28, 53, 0.94);
    color: var(--white);
    font-size: 14px;
    font-weight: 700;
    text-align: center;
    opacity: 0;
    pointer-events: none;
    transform: translate(-50%, 24px);
    transition: opacity 0.2s ease, transform 0.2s ease;
}

.copy-toast.is-visible {
    opacity: 1;
    transform: translate(-50%, 0);
}

.is-hidden {
    display: none !important;
}

@media (max-width: 820px) {
    .page-shell {
        width: min(100% - 28px, 720px);
        padding-top: 20px;
    }

    .brand-hero {
        padding: 28px;
        border-radius: 22px;
    }

    .official-entry {
        align-items: stretch;
        flex-direction: column;
        gap: 20px;
    }

    .official-actions {
        display: grid;
        grid-template-columns: 1fr 1fr;
    }

    .groups-section {
        padding-top: 48px;
    }
}

@media (max-width: 680px) {
    .groups-grid {
        grid-template-columns: 1fr;
    }

    .groups-heading {
        align-items: flex-start;
        flex-direction: column;
        gap: 8px;
    }

    .status-filters {
        display: grid;
        grid-template-columns: 1fr 1fr;
    }

    .filter-button {
        width: 100%;
        padding: 0 12px;
    }
}

@media (max-width: 480px) {
    .page-shell,
    .site-footer {
        width: calc(100% - 24px);
    }

    .brand-hero {
        padding: 22px 18px;
    }

    .brand-heading {
        align-items: flex-start;
        gap: 13px;
        margin-bottom: 22px;
    }

    .pineapple-mark {
        width: 52px;
        height: 52px;
        border-radius: 15px;
    }

    .pineapple-mark svg {
        width: 34px;
        height: 34px;
    }

    .brand-heading h1 {
        font-size: 27px;
    }

    .official-entry {
        padding: 20px 17px;
    }

    .official-url {
        font-size: 19px;
    }

    .official-actions {
        grid-template-columns: 1fr;
    }

    .brand-intro {
        font-size: 15px;
    }

    .groups-section {
        padding-top: 42px;
    }

    .status-filters {
        gap: 8px;
    }

    .filter-button {
        min-height: 48px;
        font-size: 13px;
    }

    .group-card {
        padding: 22px 18px;
    }

    .group-card-heading h3 {
        font-size: 19px;
    }

    .group-number-row strong {
        font-size: 18px;
    }

    .group-actions {
        gap: 9px;
    }

    .group-button {
        min-height: 50px;
        padding: 0 10px;
        font-size: 13px;
    }
}