/* === Reset & Base === */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #1c2128;
    --bg-card: #161b22;
    --border-color: #30363d;
    --border-focus: #58a6ff;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;
    --accent: #58a6ff;
    --accent-green: #3fb950;
    --accent-red: #f85149;
    --accent-yellow: #d29922;
    --accent-purple: #bc8cff;
    --mono-font: 'SF Mono', 'Cascadia Code', 'Fira Code', 'Consolas', 'Monaco', monospace;
    --sans-font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
}

html {
    font-size: 14px;
}

body {
    font-family: var(--sans-font);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* === Layout === */
.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

/* === Header === */
header {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.header-logo {
    margin-bottom: 0.75rem;
}

.bitcoin-logo {
    width: 56px;
    height: 56px;
    filter: drop-shadow(0 0 12px rgba(247, 147, 26, 0.4));
    transition: transform 0.3s ease;
}

.bitcoin-logo:hover {
    transform: scale(1.1) rotate(5deg);
}

header h1 {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.3rem;
}

header .subtitle {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* === Input Section === */
.input-section {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

textarea, input[type="number"], select {
    width: 100%;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-family: var(--mono-font);
    font-size: 0.85rem;
    padding: 0.75rem;
    transition: border-color 0.2s;
    outline: none;
}

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

textarea:focus, input:focus, select:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.1);
}

select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238b949e' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    padding-right: 2rem;
}

.form-row {
    display: flex;
    gap: 1rem;
    align-items: flex-end;
}

.form-row .form-group {
    flex: 1;
    margin-bottom: 0;
}

.btn-group {
    flex: 0 0 auto;
}

button {
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 6px;
    padding: 0.75rem 2rem;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
    white-space: nowrap;
}

button:hover {
    background: #4c99eb;
}

button:active {
    transform: scale(0.98);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* === Share Button === */
.share-btn {
    background: transparent;
    border: 1px solid var(--accent);
    color: var(--accent);
    padding: 0.75rem 1.5rem;
}

.share-btn:hover {
    background: rgba(88, 166, 255, 0.1);
}

.share-btn-copied {
    border-color: var(--accent-green);
    color: var(--accent-green);
    background: rgba(63, 185, 80, 0.1);
}

/* === Loading === */
.loading {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.hidden {
    display: none !important;
}

/* === Error Section === */
.error-section {
    background: rgba(248, 81, 73, 0.1);
    border: 1px solid rgba(248, 81, 73, 0.4);
    border-radius: 8px;
    padding: 1.25rem;
    margin-bottom: 1.5rem;
}

.error-badge {
    display: inline-block;
    background: var(--accent-red);
    color: #fff;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.error-section pre {
    color: #ffa198;
    font-family: var(--mono-font);
    font-size: 0.8rem;
    white-space: pre-wrap;
    word-break: break-word;
}

/* === Result Cards === */
.result-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.25rem;
    margin-bottom: 1rem;
}

.result-card h2 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

/* === Info Grid === */
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 0.75rem;
}

.info-item {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.info-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

.info-value {
    font-family: var(--mono-font);
    font-size: 0.85rem;
    color: var(--accent);
    word-break: break-all;
}

/* === Code Block === */
.code-block {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 1rem;
    font-family: var(--mono-font);
    font-size: 0.8rem;
    color: var(--text-primary);
    overflow-x: auto;
    white-space: pre-wrap;
    word-break: break-all;
    line-height: 1.5;
}

/* === Validation === */
.valid-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    background: rgba(63, 185, 80, 0.15);
    color: var(--accent-green);
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 600;
}

.invalid-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    background: rgba(248, 81, 73, 0.15);
    color: var(--accent-red);
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 600;
}

/* === Timelock List === */
.timelock-item {
    background: rgba(210, 153, 34, 0.1);
    border: 1px solid rgba(210, 153, 34, 0.3);
    border-radius: 6px;
    padding: 0.6rem 0.8rem;
    margin-bottom: 0.5rem;
    font-family: var(--mono-font);
    font-size: 0.8rem;
    color: var(--accent-yellow);
}

/* === Key Table === */
.key-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 0.5rem;
}

.key-table th {
    text-align: left;
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 0.5rem 0.75rem;
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
}

.key-table td {
    font-family: var(--mono-font);
    font-size: 0.78rem;
    padding: 0.6rem 0.75rem;
    border-bottom: 1px solid rgba(48, 54, 61, 0.5);
    color: var(--text-primary);
    word-break: break-all;
}

.key-table tr:last-child td {
    border-bottom: none;
}

.key-table tr:hover td {
    background: rgba(88, 166, 255, 0.04);
}

.fingerprint {
    color: var(--accent-purple);
    font-weight: 600;
}

.path-label {
    display: inline-block;
    background: rgba(88, 166, 255, 0.15);
    color: var(--accent);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* === Scroll wrapper for large scripts === */
.script-wrapper {
    max-height: 200px;
    overflow-y: auto;
}

.script-wrapper::-webkit-scrollbar {
    width: 6px;
}

.script-wrapper::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

.script-wrapper::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

/* === Copy Button === */
.copy-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.3rem 0.6rem;
    font-size: 0.7rem;
    border-radius: 4px;
    cursor: pointer;
    float: right;
    margin-top: -0.2rem;
}

.copy-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* === Mempool Link === */
.mempool-link {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    font-family: var(--sans-font);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent);
    text-decoration: none;
    background: rgba(88, 166, 255, 0.1);
    border: 1px solid rgba(88, 166, 255, 0.3);
    border-radius: 4px;
    padding: 0.2rem 0.5rem;
    margin-left: 0.5rem;
    transition: background 0.2s, border-color 0.2s;
    vertical-align: middle;
}

.mempool-link:hover {
    background: rgba(88, 166, 255, 0.2);
    border-color: var(--accent);
    text-decoration: none;
}

.address-row {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.3rem;
}

/* === Address Explorer === */
.address-explorer-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 0.75rem;
}

.explorer-nav-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.4rem 1rem;
    font-size: 0.8rem;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
}

.explorer-nav-btn:hover:not(:disabled) {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.explorer-nav-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.explorer-range {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 600;
    min-width: 120px;
    text-align: center;
}

.explorer-table {
    width: 100%;
    border-collapse: collapse;
}

.explorer-table th {
    text-align: left;
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 0.5rem 0.75rem;
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
}

.explorer-table td {
    font-family: var(--mono-font);
    font-size: 0.75rem;
    padding: 0.5rem 0.75rem;
    border-bottom: 1px solid rgba(48, 54, 61, 0.5);
    color: var(--text-primary);
}

.explorer-table tr:last-child td {
    border-bottom: none;
}

.explorer-table tr:hover td {
    background: rgba(88, 166, 255, 0.04);
}

.explorer-row-current td {
    background: rgba(88, 166, 255, 0.08);
    border-left: 3px solid var(--accent);
}

.explorer-address {
    word-break: break-all;
    max-width: 400px;
}

.address-explorer-list {
    max-height: 400px;
    overflow-y: auto;
}

/* === Footer === */
footer {
    text-align: center;
    padding: 2rem 1rem;
    color: var(--text-muted);
    font-size: 0.8rem;
    border-top: 1px solid var(--border-color);
    margin-top: 2rem;
}

footer a {
    color: var(--accent);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* === Responsive === */
@media (max-width: 640px) {
    .container {
        padding: 1rem;
    }

    .form-row {
        flex-direction: column;
    }

    header h1 {
        font-size: 1.4rem;
    }

    .key-table {
        font-size: 0.7rem;
    }

    .key-table th, .key-table td {
        padding: 0.4rem;
    }
}