:root {
    --c-bg: #111113;
    --c-surface: #19191d;
    --c-surface-raised: #222228;
    --c-border: rgba(255, 255, 255, 0.06);
    --c-border-focus: rgba(145, 130, 255, 0.5);

    --c-text: #ececef;
    --c-text-2: #9494a0;
    --c-text-3: #5c5c6a;

    --c-accent: #8b7bff;
    --c-accent-dim: rgba(139, 123, 255, 0.12);
    --c-accent-glow: rgba(139, 123, 255, 0.25);

    --c-ok: #5ae09e;
    --c-err: #f06;

    --r: 12px;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --mono: 'JetBrains Mono', 'SF Mono', 'Cascadia Code', monospace;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: var(--font);
    background: var(--c-bg);
    color: var(--c-text);
    min-height: 100vh;
    display: flex;
    justify-content: center;
}

#app {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 40px 20px;
}

.container {
    width: 100%;
    max-width: 440px;
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.title-area {
    text-align: center;
}

.title-area h1 {
    font-size: 1.6rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--c-text);
    margin-bottom: 8px;
}

.subtitle {
    font-size: 0.875rem;
    color: var(--c-text-2);
    font-weight: 400;
}

.card {
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: 16px;
    padding: 28px 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.label {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--c-text-2);
    letter-spacing: 0.02em;
}

.input-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
}

.seg {
    width: 76px;
    height: 48px;
    text-align: center;
    font-family: var(--mono);
    font-size: 1.05rem;
    font-weight: 500;
    letter-spacing: 0.14em;
    color: var(--c-text);
    background: var(--c-surface-raised);
    border: 1.5px solid var(--c-border);
    border-radius: var(--r);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
    text-transform: uppercase;
}

.seg::placeholder {
    color: var(--c-text-3);
    font-weight: 400;
    letter-spacing: 0.08em;
}

.seg:focus {
    border-color: var(--c-border-focus);
    box-shadow: 0 0 0 3px var(--c-accent-dim);
}

.dash {
    width: 20px;
    text-align: center;
    color: var(--c-text-3);
    font-size: 0.85rem;
    user-select: none;
    flex-shrink: 0;
}

.btn {
    position: relative;
    width: 100%;
    height: 46px;
    border: none;
    border-radius: var(--r);
    background: var(--c-accent);
    color: #fff;
    font-family: var(--font);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: opacity 0.15s, transform 0.1s;
    box-shadow: 0 2px 16px var(--c-accent-glow);
}

.btn:hover:not(:disabled) {
    opacity: 0.9;
}

.btn:active:not(:disabled) {
    transform: scale(0.985);
}

.btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
    box-shadow: none;
}

.btn.loading .btn-label {
    visibility: hidden;
}

.btn.loading .btn-spinner {
    display: block;
    position: absolute;
}

.btn-spinner {
    display: none;
    animation: spin 0.7s linear infinite;
}

.btn-spinner.hidden {
    display: none;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.result {
    display: flex;
    flex-direction: column;
    gap: 10px;
    animation: fadeIn 0.3s ease;
}

.result.hidden {
    display: none;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(6px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.result-tag {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--c-ok);
    letter-spacing: 0.02em;
}

.copy-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    border: 1px solid var(--c-border);
    border-radius: 8px;
    background: transparent;
    color: var(--c-text-2);
    cursor: pointer;
    transition: color 0.15s, border-color 0.15s;
}

.copy-btn:hover {
    color: var(--c-text);
    border-color: rgba(255, 255, 255, 0.14);
}

.copy-btn.copied {
    color: var(--c-ok);
    border-color: rgba(90, 224, 158, 0.3);
}

.copy-btn.copied .icon-copy {
    display: none;
}

.copy-btn.copied .icon-check {
    display: block;
}

.copy-btn .icon-check {
    display: none;
}

.code {
    font-family: var(--mono);
    font-size: 0.8rem;
    line-height: 1.6;
    color: var(--c-text);
    background: var(--c-surface-raised);
    border: 1px solid var(--c-border);
    border-radius: var(--r);
    padding: 14px 16px;
    word-break: break-all;
    white-space: pre-wrap;
    margin: 0;
}

.error {
    font-size: 0.83rem;
    color: var(--c-err);
    padding: 12px 16px;
    background: rgba(255, 0, 102, 0.06);
    border: 1px solid rgba(255, 0, 102, 0.12);
    border-radius: var(--r);
    animation: fadeIn 0.3s ease;
}

.error.hidden {
    display: none;
}

.stats {
    text-align: center;
    font-size: 0.95rem;
    color: var(--c-text-3);
    transition: opacity 0.3s ease;
}

.stats:empty {
    display: none;
}

.footer {
    text-align: center;
    font-size: 0.85rem;
    color: var(--c-text-3);
    letter-spacing: 0.02em;
}

.footer a {
    color: var(--c-text-2);
    text-decoration: none;
    transition: color 0.2s;
}

.footer a:hover {
    color: var(--c-accent);
}

@media (max-width: 480px) {
    .container {
        gap: 28px;
    }

    .title-area h1 {
        font-size: 1.35rem;
    }

    .card {
        padding: 24px 18px;
    }

    .seg {
        width: 62px;
        height: 44px;
        font-size: 0.95rem;
    }

    .dash {
        width: 14px;
        font-size: 0.8rem;
    }
}

.hidden {
    display: none !important;
}