:root {
    --bg: #d9fff1;
    --bg-pattern: rgba(0, 160, 120, 0.12);
    --panel: #00ffff;
    --panel-soft: #efffff;
    --lime: #99ff00;
    --lime-dark: #3b7800;
    --ink: #10201c;
    --muted: #53645f;
    --border: #111;
    --shadow: rgba(0, 0, 0, 0.22);
    --danger: #b00020;
    --success: #0a6c2b;
    --visit: #13783f;
    --host: #0b5f99;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    color: var(--ink);
    background:
        radial-gradient(circle at 10% 10%, var(--bg-pattern) 0 12px, transparent 13px),
        linear-gradient(135deg, #dffff7, #b5f6cb 55%, #f8ff91);
    background-size: 42px 42px, auto;
}

a {
    color: #050505;
    font-weight: 900;
    text-decoration: none;
}

a:hover,
a:focus {
    text-decoration: underline;
}

.page-shell {
    width: min(920px, calc(100% - 24px));
    margin: 18px auto;
}

.hero,
.panel,
.main-nav,
footer,
.flash {
    border: 2px solid var(--border);
    box-shadow: 7px 7px 0 var(--shadow);
}

.hero {
    text-align: center;
    padding: 28px 18px;
    background: var(--panel);
}

.eyebrow {
    margin: 0 0 8px;
    font-size: 0.8rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--lime-dark);
    font-weight: 900;
}

h1,
h2,
h3,
p {
    margin-top: 0;
}

h1 {
    margin-bottom: 10px;
    font-size: clamp(1.8rem, 4vw, 3rem);
    line-height: 1.05;
}

.subtitle {
    margin: 0 auto;
    max-width: 720px;
    font-weight: 700;
}

.main-nav {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    margin: 16px 0;
    background: var(--lime);
}

.main-nav a {
    display: block;
    padding: 14px 10px;
    text-align: center;
    border-right: 2px solid var(--border);
}

.main-nav a:last-child {
    border-right: 0;
}

.flash-wrap {
    display: grid;
    gap: 10px;
    margin-bottom: 16px;
}

.flash {
    padding: 12px 14px;
    background: #fff;
    font-weight: 800;
}

.flash.success {
    border-color: var(--success);
}

.flash.error {
    border-color: var(--danger);
}

.panel {
    background: var(--panel);
    padding: 18px;
    margin: 0 0 18px;
}

.intro {
    background: linear-gradient(180deg, var(--panel), #8fffff);
}

.small-note {
    color: var(--muted);
    font-size: 0.9rem;
}

.section-head {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    align-items: center;
    margin-bottom: 12px;
}

.reload-button,
button {
    cursor: pointer;
    border: 2px solid var(--border);
    background: var(--lime);
    color: var(--ink);
    font-weight: 900;
    padding: 10px 14px;
    box-shadow: 3px 3px 0 var(--shadow);
}

button:hover,
button:focus {
    transform: translate(-1px, -1px);
    box-shadow: 4px 4px 0 var(--shadow);
}

button.secondary {
    background: #fff;
}

.empty-state {
    padding: 18px;
    background: var(--panel-soft);
    border: 2px dashed var(--lime-dark);
    font-weight: 700;
}

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

.friend-card {
    background: var(--panel-soft);
    border: 2px solid var(--border);
    padding: 14px;
    position: relative;
    overflow: hidden;
}

.friend-card::before {
    content: '';
    position: absolute;
    inset: 0 auto 0 0;
    width: 8px;
    background: var(--lime-dark);
}

.friend-card.visit::before {
    background: var(--visit);
}

.friend-card.host::before {
    background: var(--host);
}

.card-topline {
    display: flex;
    justify-content: space-between;
    gap: 10px;
    align-items: center;
    margin-bottom: 10px;
    padding-left: 8px;
}

.badge {
    display: inline-block;
    padding: 4px 8px;
    background: var(--lime);
    border: 1px solid var(--border);
    font-size: 0.8rem;
    font-weight: 900;
}

.valid {
    color: var(--muted);
    font-size: 0.84rem;
    font-weight: 700;
}

.friend-card h3,
.friend-card p {
    padding-left: 8px;
}

.friend-code {
    font-size: clamp(1.1rem, 2vw, 1.45rem);
    letter-spacing: 0.03em;
    font-weight: 900;
    background: #fff700;
    border: 1px solid var(--border);
    padding: 8px !important;
    display: inline-block;
}

.wish-text {
    color: #123;
    font-weight: 800;
}

.contact {
    background: rgba(255, 255, 255, 0.75);
    border-left: 4px solid var(--lime-dark);
    padding: 10px !important;
    overflow-wrap: anywhere;
}

.friend-form {
    display: grid;
    gap: 14px;
}

fieldset {
    border: 2px solid var(--border);
    padding: 14px;
    background: rgba(255, 255, 255, 0.45);
}

legend,
label {
    font-weight: 900;
}

label {
    display: grid;
    gap: 6px;
}

input,
select {
    width: 100%;
    padding: 11px 10px;
    border: 2px solid var(--border);
    background: #fff;
    color: var(--ink);
    font: inherit;
}

.friend-code-inputs {
    display: flex;
    align-items: center;
    gap: 10px;
    max-width: 440px;
}

.friend-code-inputs input {
    text-align: center;
    font-weight: 900;
    font-size: 1.25rem;
}

.friend-code-inputs span {
    font-size: 1.4rem;
    font-weight: 900;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

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

.old-list {
    background: #d6eeee;
}

.old-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
}

.old-grid article {
    background: rgba(255, 255, 255, 0.7);
    border: 1px solid #8aa;
    color: #596060;
    padding: 10px;
    font-size: 0.9rem;
}

footer {
    background: var(--lime);
    padding: 14px;
    text-align: center;
}

footer p:last-child {
    margin-bottom: 0;
}

@media (max-width: 760px) {
    .page-shell {
        width: min(100% - 14px, 920px);
        margin-top: 8px;
    }

    .main-nav,
    .cards,
    .grid-3,
    .old-grid {
        grid-template-columns: 1fr;
    }

    .main-nav a {
        border-right: 0;
        border-bottom: 2px solid var(--border);
    }

    .main-nav a:last-child {
        border-bottom: 0;
    }

    .section-head {
        align-items: stretch;
        flex-direction: column;
    }

    .friend-code-inputs {
        display: grid;
        grid-template-columns: 1fr auto 1fr auto 1fr;
    }

    .hero,
    .panel,
    .main-nav,
    footer,
    .flash {
        box-shadow: 4px 4px 0 var(--shadow);
    }
}

code {
    display: inline-block;
    padding: 2px 6px;
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid rgba(0, 0, 0, 0.25);
    border-radius: 4px;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 0.92em;
}

.storage-panel {
    background: linear-gradient(180deg, #f5ffff, #bfffff);
}