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

:root {
    --bg: #1a1a1a;
    --bg-secondary: #222222;
    --text: #e0e0e0;
    --text-secondary: #999999;
    --text-tertiary: #666666;
    --border: #333333;
    --border-light: #2a2a2a;
    --accent: #d0d0d0;
    --accent-hover: #ffffff;
    --accent-light: #252525;
    --success: #3dbb3d;
    --error: #ee4444;
    --font-primary: "Helvetica Neue", Helvetica, Arial, sans-serif;
    --mono: "Space Mono", "SF Mono", "Courier New", Courier, monospace;
}

[data-font="classic"] {
    --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
    --mono: "SF Mono", "Fira Code", "Consolas", monospace;
}

[data-theme="light"] {
    --bg: #EAEAE6;
    --bg-secondary: #e0e0dc;
    --text: #111111;
    --text-secondary: #555555;
    --text-tertiary: #888888;
    --border: #c8c8c4;
    --border-light: #d8d8d4;
    --accent: #111111;
    --accent-hover: #000000;
    --accent-light: #deded9;
    --success: #1a8a1a;
    --error: #cc2222;
}

body {
    font-family: var(--font-primary);
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
    font-size: inherit;
}

input, textarea {
    font-family: inherit;
    font-size: inherit;
    border: 1px solid var(--border);
    padding: 12px 16px;
    width: 100%;
    outline: none;
    transition: border-color 0.15s;
    background: var(--bg);
    color: var(--text);
}

input:focus, textarea:focus {
    border-color: var(--accent);
}

input[type="file"] {
    border: none;
    padding: 0;
}

.btn {
    display: inline-block;
    padding: 12px 32px;
    border: 1px solid var(--accent);
    color: var(--accent);
    font-size: 14px;
    letter-spacing: 0.5px;
    transition: all 0.15s;
    text-align: center;
}

.btn:hover {
    background: var(--accent);
    color: var(--bg);
}

.btn-primary {
    background: var(--accent);
    color: var(--bg);
}

.btn-primary:hover {
    background: var(--accent-hover);
}

.btn-small {
    padding: 8px 20px;
    font-size: 13px;
}

.btn-full {
    display: block;
    width: 100%;
}

.mono {
    font-family: var(--mono);
    font-size: 13px;
}

.text-secondary {
    color: var(--text-secondary);
}

.text-small {
    font-size: 13px;
}

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

.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }

.container {
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 24px;
}

.container-narrow {
    max-width: 480px;
    margin: 0 auto;
    padding: 0 24px;
}

.card {
    border: 1px solid var(--border);
    padding: 24px;
    margin-bottom: 16px;
}

.divider {
    border: none;
    border-top: 1px solid var(--border-light);
    margin: 24px 0;
}

.status {
    display: inline-block;
    padding: 4px 12px;
    font-size: 12px;
    letter-spacing: 0.5px;
}

.status-pending {
    border: 1px solid var(--text-tertiary);
    color: var(--text-tertiary);
}

.status-success {
    border: 1px solid var(--success);
    color: var(--success);
}

.status-error {
    border: 1px solid var(--error);
    color: var(--error);
}

.copyable {
    cursor: pointer;
    position: relative;
}

.copyable:hover::after {
    content: 'copy';
    position: absolute;
    right: -40px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 11px;
    color: var(--text-tertiary);
}

.loading {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

.loading-center {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 60vh;
}

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

.toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    padding: 12px 24px;
    background: var(--accent);
    color: var(--bg);
    font-size: 14px;
    z-index: 1000;
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.2s;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

@media (max-width: 640px) {
    .container { padding: 0 16px; }
    .container-narrow { padding: 0 16px; }
    .btn { padding: 10px 24px; }
}

/* Theme toggle */
.theme-toggle {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 16px;
    padding: 0;
}

.theme-toggle:hover {
    border-color: var(--accent);
    color: var(--text);
}