:root {
    --bg: #0d1117;
    --bg-card: #161b22;
    --bg-input: #0d1117;
    --border: #30363d;
    --text: #c9d1d9;
    --text-muted: #8b949e;
    --accent: #58a6ff;
    --green: #238636;
    --green-hover: #2ea043;
    --red: #f85149;
    --red-bg: rgba(248, 81, 73, 0.1);
    --red-border: rgba(248, 81, 73, 0.3);
}

[data-theme="light"] {
    --bg: #f6f8fa;
    --bg-card: #ffffff;
    --bg-input: #f6f8fa;
    --border: #d0d7de;
    --text: #1f2328;
    --text-muted: #656d76;
    --accent: #0969da;
    --green: #1a7f37;
    --green-hover: #156d2e;
    --red: #cf222e;
    --red-bg: rgba(207, 34, 46, 0.1);
    --red-border: rgba(207, 34, 46, 0.3);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, monospace;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 40px 20px;
}

.container {
    width: 100%;
    max-width: 600px;
}

header {
    margin-bottom: 40px;
    overflow: hidden;
}

header h1 {
    font-size: 2rem;
    color: var(--accent);
    margin-bottom: 8px;
    text-align: center;
    overflow: hidden;
    width: 100%;
}

.no-decor {
    text-decoration: none;
    color: inherit;
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.9rem;
    text-align: center;
    overflow: hidden;
}

#theme-toggle,
#lang-toggle {
    background: none;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 6px 10px;
    cursor: pointer;
    font-size: 0.85rem;
    color: var(--text);
    line-height: 1;
}

#theme-toggle:hover,
#lang-toggle:hover {
    background: var(--bg-card);
}

.header-controls {
    float: right;
    display: flex;
    gap: 6px;
}

header::after {
    content: '';
    display: table;
    clear: both;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 24px;
    margin-bottom: 16px;
}

.card h2 {
    color: var(--accent);
    margin-bottom: 12px;
    font-size: 1.1rem;
}

.hint {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 16px;
    text-align: justify;
}

#key-switcher label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-muted);
    font-size: 0.85rem;
}

#key-switcher select {
    width: 100%;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text);
    padding: 10px;
    font-family: monospace;
    font-size: 0.85rem;
}

#key-switcher select:focus {
    outline: none;
    border-color: var(--accent);
}

textarea {
    width: 100%;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text);
    padding: 12px;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    resize: vertical;
}

textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(88, 166, 255, 0.2);
}

[data-theme="light"] textarea:focus {
    box-shadow: 0 0 0 2px rgba(9, 105, 218, 0.2);
}

.btn-primary {
    width: 100%;
    background: var(--green);
    color: #fff;
    border: none;
    border-radius: 6px;
    padding: 12px;
    font-size: 1rem;
    cursor: pointer;
    font-weight: 600;
    margin-top: 16px;
}

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

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-secondary {
    width: 100%;
    background: var(--bg-card);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 10px;
    font-size: 0.9rem;
    cursor: pointer;
    margin-top: 12px;
}

.btn-secondary:hover {
    background: var(--border);
}

.input-group {
    display: flex;
    gap: 8px;
}

.input-group input {
    flex: 1;
    min-width: 0;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--accent);
    padding: 10px;
    font-family: monospace;
    font-size: 0.85rem;
}

.input-group button {
    background: var(--bg-card);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 10px 16px;
    cursor: pointer;
    white-space: nowrap;
}

.input-group button:hover {
    background: var(--border);
}

.error {
    color: var(--red);
    margin-top: 16px;
    padding: 12px;
    background: var(--red-bg);
    border-radius: 6px;
    border: 1px solid var(--red-border);
}

.hidden {
    display: none !important;
}

.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-muted);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 16px;
}

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

.status {
    color: var(--text-muted);
    padding: 20px 0;
    text-align: center;
}

#passwords pre,
.message-card pre {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text);
    padding: 16px;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    white-space: pre-wrap;
    word-break: break-all;
}

.message-card {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 16px;
    margin-bottom: 12px;
}

.message-time {
    color: var(--text-muted);
    font-size: 0.8rem;
    margin-bottom: 8px;
}

.success-card {
    text-align: center;
    padding: 40px 24px;
}

.success-card p {
    color: var(--text-muted);
    margin-top: 8px;
}

.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
    padding: 20px;
}

.modal {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 24px;
    text-align: center;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

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

.modal-header h3 {
    color: var(--text);
    font-size: 1rem;
}

.modal-close {
    background: none;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 6px 10px;
    cursor: pointer;
    font-size: 0.85rem;
    color: var(--text);
    line-height: 1;
    white-space: nowrap;
}

.modal-close:hover {
    background: var(--border);
}

.qr-box {
    display: inline-block;
    background: #fff;
    padding: 12px;
    border-radius: 6px;
}

.qr-box svg {
    display: block;
}