:root {
    --d4s-bg: #f1f3f5;
    --d4s-surface: #ffffff;
    --d4s-surface-soft: #f8f9fa;
    --d4s-line: #d9dee3;
    --d4s-text: #17212b;
    --d4s-muted: #607080;
    --d4s-primary: #245b78;
    --d4s-primary-dark: #19445c;
    --d4s-accent: #dcebf2;
    --d4s-green: #27734d;
    --d4s-green-soft: #e2f3e9;
    --d4s-red: #a53a44;
    --d4s-red-soft: #f8e5e7;
    --d4s-amber: #8a6418;
    --d4s-shadow: 0 12px 34px rgba(31, 45, 58, .09);
    --d4s-radius: 18px;
}

html, body.d4s-standalone {
    margin: 0 !important;
    min-height: 100%;
    background: var(--d4s-bg) !important;
}

body.d4s-standalone {
    color: var(--d4s-text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
    font-size: 16px;
    line-height: 1.45;
    -webkit-font-smoothing: antialiased;
}

.d4s-app,
.d4s-app * {
    box-sizing: border-box;
}

.d4s-app {
    width: min(100%, 1120px);
    min-height: 100vh;
    margin: 0 auto;
    padding: 24px;
    color: var(--d4s-text);
    background: var(--d4s-bg);
}

.d4s-app h1,
.d4s-app h2,
.d4s-app h3,
.d4s-app p {
    color: var(--d4s-text);
    margin-top: 0;
}

.d4s-app h1 {
    margin-bottom: 8px;
    font-size: clamp(1.65rem, 4vw, 2.25rem);
    line-height: 1.15;
}

.d4s-app h2 {
    font-size: 1.25rem;
}

.d4s-app p,
.d4s-app small {
    color: var(--d4s-muted);
}

.d4s-topbar,
.d4s-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.d4s-topbar {
    position: sticky;
    z-index: 20;
    top: 0;
    margin: -24px -24px 22px;
    padding: 16px 24px;
    background: rgba(241, 243, 245, .94);
    border-bottom: 1px solid var(--d4s-line);
    backdrop-filter: blur(12px);
}

.d4s-brand {
    display: flex;
    min-width: 0;
    align-items: center;
    gap: 12px;
}

.d4s-brand div {
    display: grid;
    min-width: 0;
}

.d4s-brand strong {
    overflow: hidden;
    color: var(--d4s-text);
    font-size: 1rem;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.d4s-brand small {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.d4s-mark {
    display: grid;
    width: 48px;
    height: 48px;
    flex: 0 0 48px;
    place-items: center;
    overflow: hidden;
    color: #fff;
    background: var(--d4s-primary);
    border-radius: 15px;
    font-size: .82rem;
    font-weight: 800;
    letter-spacing: .02em;
}

.d4s-nav {
    display: flex;
    gap: 8px;
    margin: 0 0 26px;
    padding: 4px;
    overflow-x: auto;
    scrollbar-width: none;
}

.d4s-nav::-webkit-scrollbar {
    display: none;
}

.d4s-nav a {
    flex: 0 0 auto;
    padding: 10px 14px;
    color: var(--d4s-muted);
    background: var(--d4s-surface);
    border: 1px solid var(--d4s-line);
    border-radius: 999px;
    font-size: .94rem;
    font-weight: 650;
    text-decoration: none;
}

.d4s-nav a:hover,
.d4s-nav a:focus {
    color: var(--d4s-primary);
    border-color: var(--d4s-primary);
}

.d4s-nav a.active {
    color: #fff;
    background: var(--d4s-primary);
    border-color: var(--d4s-primary);
}

.d4s-main {
    width: 100%;
}

.d4s-panel,
.d4s-card,
.d4s-record,
.d4s-stats article {
    color: var(--d4s-text);
    background: var(--d4s-surface);
    border: 1px solid var(--d4s-line);
    border-radius: var(--d4s-radius);
    box-shadow: var(--d4s-shadow);
}

.d4s-panel {
    padding: 20px;
}

.d4s-login {
    display: grid;
    width: min(100%, 440px);
    min-height: calc(100vh - 48px);
    margin: 0 auto;
    align-content: center;
    gap: 22px;
}

.d4s-login .d4s-brand {
    justify-content: center;
}

.d4s-login .d4s-brand strong {
    font-size: 1.25rem;
}

.d4s-app form label {
    display: grid;
    gap: 7px;
    margin-bottom: 15px;
    color: #465767;
    font-size: .92rem;
    font-weight: 650;
}

.d4s-app fieldset {
    margin: 0 0 16px;
    padding: 14px;
    border: 1px solid var(--d4s-line);
    border-radius: 14px;
}

.d4s-app legend {
    padding: 0 6px;
    color: var(--d4s-text);
    font-weight: 700;
}

.d4s-app input,
.d4s-app select,
.d4s-app textarea {
    width: 100%;
    min-height: 46px;
    padding: 11px 12px;
    color: var(--d4s-text) !important;
    background: #fff !important;
    border: 1px solid #b9c2ca !important;
    border-radius: 11px !important;
    outline: none;
    font: inherit !important;
}

.d4s-app input:focus,
.d4s-app select:focus,
.d4s-app textarea:focus {
    border-color: var(--d4s-primary) !important;
    box-shadow: 0 0 0 3px rgba(36, 91, 120, .14);
}

.d4s-app textarea {
    min-height: 96px;
    resize: vertical;
}

.d4s-primary,
.d4s-secondary,
.d4s-ghost {
    display: inline-flex;
    min-height: 44px;
    align-items: center;
    justify-content: center;
    padding: 10px 16px;
    border-radius: 11px;
    font: inherit;
    font-weight: 750;
    text-align: center;
    text-decoration: none;
    cursor: pointer;
}

.d4s-primary {
    color: #fff !important;
    background: var(--d4s-primary);
    border: 1px solid var(--d4s-primary);
}

.d4s-primary:hover,
.d4s-primary:focus {
    background: var(--d4s-primary-dark);
}

.d4s-secondary {
    color: var(--d4s-primary) !important;
    background: var(--d4s-surface);
    border: 1px solid var(--d4s-primary);
}

.d4s-ghost {
    color: var(--d4s-text) !important;
    background: var(--d4s-surface);
    border: 1px solid var(--d4s-line);
}

.d4s-grid,
.d4s-stats,
.d4s-settings-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}

.d4s-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin: 20px 0;
}

.d4s-stats article {
    display: grid;
    gap: 8px;
    padding: 18px;
}

.d4s-stats strong {
    color: var(--d4s-primary);
    font-size: 1.6rem;
}

.d4s-settings-grid {
    grid-template-columns: 1.3fr .7fr;
}

.d4s-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.d4s-card-list,
.d4s-penalties,
.d4s-records,
.d4s-rule-list {
    display: grid;
    gap: 12px;
    margin-top: 18px;
}

.d4s-card {
    display: grid;
    gap: 6px;
    padding: 18px;
    color: var(--d4s-text) !important;
    text-decoration: none;
}

.d4s-card strong {
    color: var(--d4s-text);
}

.d4s-card span {
    color: var(--d4s-primary);
}

.d4s-card-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
}

.d4s-card-actions a {
    color: var(--d4s-primary);
    font-weight: 700;
    text-decoration: none;
}

.d4s-catalog-card.is-inactive {
    background: var(--d4s-surface-soft);
    opacity: .72;
}

.d4s-catalog-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 8px;
    padding-top: 12px;
    border-top: 1px solid var(--d4s-line);
}

.d4s-catalog-actions form {
    margin: 0;
}

.d4s-catalog-actions .d4s-secondary,
.d4s-catalog-actions .d4s-ghost,
.d4s-danger {
    min-height: 40px;
    padding: 8px 12px;
    font-size: .88rem;
}

.d4s-danger {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--d4s-red);
    background: var(--d4s-red-soft);
    border: 1px solid #e3aeb4;
    border-radius: 11px;
    font: inherit;
    font-weight: 750;
    cursor: pointer;
}

.d4s-search {
    margin: 18px 0;
}

.d4s-member-tools {
    position: sticky;
    z-index: 10;
    top: 82px;
    margin: 18px 0;
    padding: 14px;
    background: rgba(241, 243, 245, .96);
    border: 1px solid var(--d4s-line);
    border-radius: 15px;
    backdrop-filter: blur(10px);
}

.d4s-search-label {
    margin-bottom: 7px !important;
    color: var(--d4s-text) !important;
    font-weight: 750 !important;
}

.d4s-member-tools .d4s-search {
    margin: 0;
}

.d4s-autocomplete {
    position: relative;
}

.d4s-suggestions {
    position: absolute;
    z-index: 80;
    top: calc(100% + 6px);
    right: 0;
    left: 0;
    max-height: 310px;
    padding: 6px;
    overflow-y: auto;
    background: var(--d4s-surface);
    border: 1px solid var(--d4s-line);
    border-radius: 13px;
    box-shadow: 0 18px 40px rgba(31, 45, 58, .16);
}

.d4s-suggestions a,
.d4s-suggestions button {
    display: block;
    width: 100%;
    min-height: 44px;
    padding: 11px 12px;
    color: var(--d4s-text);
    background: transparent;
    border: 0;
    border-radius: 9px;
    font: inherit;
    font-weight: 650;
    text-align: left;
    text-decoration: none;
    cursor: pointer;
}

.d4s-suggestions a:hover,
.d4s-suggestions a:focus,
.d4s-suggestions button:hover,
.d4s-suggestions button:focus {
    color: var(--d4s-primary);
    background: var(--d4s-accent);
    outline: none;
}

.d4s-suggestion-empty {
    padding: 14px 12px;
    color: var(--d4s-muted);
    text-align: center;
}

.d4s-member-count {
    margin-top: 8px;
    color: var(--d4s-muted);
    font-size: .88rem;
}

.d4s-member-directory {
    display: grid;
    gap: 20px;
}

.d4s-member-group {
    display: grid;
    gap: 10px;
}

.d4s-member-group > h2 {
    position: sticky;
    z-index: 5;
    top: 178px;
    margin: 0;
    padding: 5px 2px;
    color: var(--d4s-primary);
    background: var(--d4s-bg);
    border-bottom: 2px solid var(--d4s-primary);
    font-size: 1rem;
}

.d4s-member-card {
    margin: 0;
}

.d4s-empty-state {
    padding: 28px;
    color: var(--d4s-muted);
    background: var(--d4s-surface);
    border: 1px dashed var(--d4s-line);
    border-radius: 15px;
    text-align: center;
}

[hidden] {
    display: none !important;
}

.d4s-penalty {
    display: grid !important;
    grid-template-columns: auto 1fr !important;
    align-items: start;
    gap: 12px !important;
    margin: 0 !important;
    padding: 15px;
    color: var(--d4s-text) !important;
    background: var(--d4s-surface);
    border: 1px solid var(--d4s-line);
    border-radius: 14px;
}

.d4s-penalty:has(input:checked) {
    background: var(--d4s-accent);
    border-color: var(--d4s-primary);
}

.d4s-penalty input,
.d4s-check input {
    width: 22px !important;
    min-height: 22px !important;
    margin: 1px 0 0;
}

.d4s-penalty span {
    display: grid;
    gap: 4px;
}

.d4s-penalty strong {
    color: var(--d4s-text);
}

.d4s-penalty em {
    color: var(--d4s-primary);
    font-style: normal;
    font-weight: 700;
}

.d4s-check {
    display: grid !important;
    grid-template-columns: auto 1fr !important;
    align-items: center;
    gap: 8px !important;
}

.d4s-record {
    display: flex;
    justify-content: space-between;
    gap: 18px;
    padding: 18px;
    border-left: 5px solid var(--d4s-primary);
}

.d4s-record > div {
    display: grid;
    gap: 5px;
}

.d4s-record form {
    min-width: 230px;
}

.d4s-record em {
    color: var(--d4s-muted);
    font-size: .86rem;
}

.d4s-record.status-paid {
    background: var(--d4s-green-soft);
    border-left-color: var(--d4s-green);
}

.d4s-record.status-cancelled,
.d4s-record.status-waived {
    opacity: .7;
}

.d4s-alert {
    margin-bottom: 14px;
    padding: 13px 16px;
    border-radius: 12px;
}

.d4s-alert.success {
    color: var(--d4s-green);
    background: var(--d4s-green-soft);
    border: 1px solid #b9dfca;
}

.d4s-alert.error {
    color: var(--d4s-red);
    background: var(--d4s-red-soft);
    border: 1px solid #ebc2c6;
}

.d4s-collapsible {
    display: none;
    margin: 16px 0;
}

.d4s-collapsible.open {
    display: block;
}

.d4s-sticky {
    position: sticky;
    bottom: 14px;
    width: 100%;
    margin-top: 18px;
    box-shadow: 0 8px 22px rgba(25, 68, 92, .22);
}

.d4s-rule-list div {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-top: 1px solid var(--d4s-line);
}

.d4s-logo-preview {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 4px 0 18px;
    color: var(--d4s-muted);
}

.d4s-logo-preview img {
    width: 84px;
    height: 84px;
    padding: 5px;
    object-fit: contain;
    background: #fff;
    border: 1px solid var(--d4s-line);
    border-radius: 14px;
}

.d4s-report-year {
    min-width: 170px;
}

.d4s-report-controls {
    display: flex;
    align-items: end;
    gap: 10px;
}

.d4s-report-year label {
    margin: 0 !important;
}

.d4s-report-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.d4s-report-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 18px;
}

.d4s-ranking {
    display: grid;
    gap: 14px;
}

.d4s-rank-row {
    display: grid;
    grid-template-columns: 30px 1fr auto;
    align-items: center;
    gap: 10px;
}

.d4s-rank-row > div {
    min-width: 0;
}

.d4s-rank-row strong {
    display: block;
    overflow: hidden;
    color: var(--d4s-text);
    font-size: .88rem;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.d4s-rank-number {
    display: grid;
    width: 28px;
    height: 28px;
    place-items: center;
    color: var(--d4s-primary);
    background: var(--d4s-accent);
    border-radius: 9px;
    font-weight: 800;
}

.d4s-bar {
    height: 6px;
    margin-top: 6px;
    overflow: hidden;
    background: #e3e7ea;
    border-radius: 99px;
}

.d4s-bar i {
    display: block;
    height: 100%;
    background: var(--d4s-primary);
    border-radius: inherit;
}

.d4s-funfact {
    margin-top: 18px;
    padding: 22px;
    color: var(--d4s-text);
    background: linear-gradient(135deg, #fff4cf, #ffe4d8);
    border: 1px solid #e8cc83;
    border-radius: var(--d4s-radius);
    box-shadow: var(--d4s-shadow);
}

.d4s-funfact small {
    color: var(--d4s-amber);
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: .05em;
}

.d4s-funfact h2 {
    margin: 8px 0;
}

.d4s-funfact p {
    margin: 0;
}

.d4s-funfacts {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
    margin-top: 18px;
}

.d4s-funfacts article {
    display: grid;
    gap: 5px;
    padding: 18px;
    background: var(--d4s-surface);
    border: 1px solid var(--d4s-line);
    border-radius: 15px;
}

.d4s-funfacts strong {
    color: var(--d4s-text);
}

.d4s-funfacts span {
    color: var(--d4s-muted);
    font-size: .88rem;
}

@media (max-width: 760px) {
    body.d4s-standalone {
        background: var(--d4s-bg) !important;
    }

    .d4s-app {
        width: 100%;
        min-height: 100svh;
        padding: 16px 14px calc(96px + env(safe-area-inset-bottom));
    }

    .d4s-topbar {
        margin: -16px -14px 18px;
        padding: calc(12px + env(safe-area-inset-top)) 14px 12px;
    }

    .d4s-mark {
        width: 44px;
        height: 44px;
        flex-basis: 44px;
        border-radius: 13px;
    }

    .d4s-nav {
        position: fixed;
        z-index: 100;
        right: 0;
        bottom: 0;
        left: 0;
        display: grid;
        grid-template-columns: repeat(8, minmax(64px, 1fr));
        gap: 0;
        margin: 0;
        padding: 7px 8px calc(7px + env(safe-area-inset-bottom));
        overflow-x: auto;
        background: rgba(255, 255, 255, .97);
        border-top: 1px solid var(--d4s-line);
        box-shadow: 0 -8px 26px rgba(31, 45, 58, .10);
        backdrop-filter: blur(14px);
    }

    .d4s-nav a {
        min-width: 68px;
        padding: 9px 7px;
        overflow: hidden;
        color: var(--d4s-muted);
        background: transparent;
        border: 0;
        border-radius: 10px;
        font-size: .73rem;
        text-align: center;
        text-overflow: ellipsis;
    }

    .d4s-nav a.active {
        color: var(--d4s-primary);
        background: var(--d4s-accent);
    }

    .d4s-grid,
    .d4s-stats,
    .d4s-settings-grid,
    .d4s-report-grid,
    .d4s-funfacts {
        grid-template-columns: 1fr;
    }

    .d4s-report-stats {
        grid-template-columns: 1fr 1fr;
    }

    .d4s-heading,
    .d4s-record {
        align-items: stretch;
        flex-direction: column;
    }

    .d4s-report-controls {
        align-items: stretch;
        flex-direction: column;
    }

    .d4s-heading .d4s-primary,
    .d4s-heading .d4s-secondary {
        width: 100%;
    }

    .d4s-record form {
        min-width: 0;
    }

    .d4s-stats {
        grid-template-columns: 1fr 1fr;
    }

    .d4s-stats article:last-child {
        grid-column: 1 / -1;
    }

    .d4s-panel,
    .d4s-card,
    .d4s-record,
    .d4s-stats article {
        border-radius: 15px;
        box-shadow: 0 6px 18px rgba(31, 45, 58, .07);
    }

    .d4s-login {
        min-height: calc(100svh - 32px);
    }

    .d4s-login .d4s-panel {
        padding: 20px;
    }

    .d4s-member-tools {
        top: 72px;
    }

    .d4s-member-group > h2 {
        top: 184px;
    }

    .d4s-suggestions {
        max-height: min(44vh, 330px);
    }
}

@media (max-width: 390px) {
    .d4s-topbar .d4s-ghost {
        min-height: 40px;
        padding: 8px 10px;
        font-size: .82rem;
    }

    .d4s-brand strong {
        max-width: 165px;
    }

    .d4s-stats {
        grid-template-columns: 1fr;
    }

    .d4s-stats article:last-child {
        grid-column: auto;
    }
}