:root {
    --bg: #0b0f14;
    --panel: #121823;
    --card: #0f141c;
    --muted: #0f141c80;
    --text: #e6f0ff;
    --sub: #a7b5c9;
    --acc: #68b5ff;
    --ok: #5ee1a9;
    --warn: #ffd166;
    --bad: #ff7a7a;
    --ring: 0 0 0 2px #68b5ff55;
    --radius: 18px;
    --gap: 14px;
    --shadow: 0 10px 30px rgba(0, 0, 0, .35), inset 0 1px 0 rgba(255, 255, 255, .03);
    --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    --sans: Inter, ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
}

* {
    box-sizing: border-box
}

html,
body {
    height: 100%
}

body {
    margin: 0;
    color: var(--text);
    background: linear-gradient(180deg, #0a0e13, #05080d 60%);
    font-family: var(--sans);
    line-height: 1.45;
}

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

.site-header,
.site-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 18px;
    background: var(--panel);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 10;
}

.site-footer {
    position: static;
    margin-top: 40px;
    border-top: 1px solid #ffffff10
}

.top-nav a {
    opacity: .8;
    padding: .4rem .7rem;
    border-radius: 12px
}

.top-nav a.active,
.top-nav a:hover {
    opacity: 1;
    background: #ffffff10
}

.grid {
    padding: 18px;
    display: grid;
    gap: 24px;
    max-width: 1100px;
    margin: 0 auto
}

h1,
h2,
h3 {
    margin: .2em 0 .4em
}

h1 {
    font-size: 1.6rem
}

h2 {
    font-size: 1.2rem
}

h3 {
    font-size: 1.05rem
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
    gap: var(--gap)
}

.card {
    background: var(--card);
    border: 1px solid #ffffff0f;
    border-radius: var(--radius);
    padding: 14px;
    box-shadow: var(--shadow);
    transition: transform .12s ease, box-shadow .12s ease;
}

.card:hover {
    transform: translateY(-2px);
    /* Original shadow + blue neon glow */
    box-shadow: 0 12px 42px rgba(0, 0, 0, .45), 0 0 15px #00aaff, 0 0 30px #00aaff55;
}

.card.muted {
    background: linear-gradient(180deg, var(--card), var(--muted));
    opacity: .7
}

.page {
    padding: 18px;
    max-width: 900px;
    margin: 0 auto
}

.toolbar {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    align-items: center;
    margin: 8px 0 14px
}

.input,
textarea,
select,
button {
    background: #0b121a;
    color: var(--text);
    border: 1px solid #ffffff14;
    border-radius: 12px;
    padding: .65rem .8rem;
    font: inherit;
}

input[type="number"] {
    width: 7ch
}

textarea {
    width: 100%;
    min-height: 220px;
    resize: vertical
}

button {
    cursor: pointer
}

button.primary {
    background: #0f66ff25;
    border-color: #5a9cff55
}

button.primary:hover {
    box-shadow: var(--ring)
}

button.ghost {
    background: transparent
}

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

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

.kbd {
    font-family: var(--mono);
    background: #00000060;
    padding: .1rem .4rem;
    border-radius: 8px;
    border: 1px solid #ffffff1a
}

.badge {
    padding: .2rem .5rem;
    border-radius: 999px;
    font-size: .8rem;
    border: 1px solid #ffffff1a
}

.ok {
    color: var(--ok)
}

.warn {
    color: var(--warn)
}

.bad {
    color: var(--bad)
}

table {
    width: 100%;
    border-collapse: collapse;
    background: #0b121a;
    border-radius: 14px;
    overflow: hidden
}

th,
td {
    padding: .6rem .7rem;
    border-bottom: 1px solid #ffffff10;
    text-align: left
}

footer small {
    opacity: .7
}

.center {
    display: flex;
    align-items: center;
    justify-content: center
}

.timer-display {
    font: 700 2.6rem var(--mono);
    letter-spacing: .5px;
    padding: .6rem 1rem;
    background: #0b121a;
    border-radius: 14px;
    border: 1px solid #ffffff14
}

.calc {
    display: grid;
    gap: 10px;
    grid-template-columns: repeat(4, minmax(56px, 1fr));
    max-width: 400px
}

.calc input {
    grid-column: 1/-1;
    font-family: var(--mono);
    font-size: 1.2rem;
    text-align: right
}

.calc button {
    padding: 14px 10px;
    border-radius: 12px
}