:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --bg-dark: #0f172a;
    --bg-panel: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border: #334155;
    --success: #10b981;
    --error: #ef4444;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 1rem;
}

.container {
    background-color: var(--bg-panel);
    border-radius: 12px;
    border: 1px solid var(--border);
    width: 100%;
    max-width: 400px;
    padding: 2rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-main);
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.state-message {
    text-align: center;
    padding: 1rem;
    color: var(--text-muted);
}

.state-message.error {
    color: var(--error);
    background-color: rgba(239, 68, 68, 0.1);
    border-radius: 6px;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.hidden {
    display: none !important;
}

.select-wrapper {
    margin-bottom: 1rem;
}

select {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--bg-dark);
    color: var(--text-main);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 1rem;
    outline: none;
    appearance: none;
}

select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.2);
}

button {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--primary);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
}

button:hover:not(:disabled) {
    background-color: var(--primary-hover);
}

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

#totp-display {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
}

.code-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: var(--bg-dark);
    padding: 1rem;
    border-radius: 6px;
    border: 1px solid var(--border);
    margin-bottom: 1rem;
}

.code {
    font-size: 2rem;
    font-family: monospace;
    letter-spacing: 0.2em;
    font-weight: 600;
}

#copy-btn {
    width: auto;
    padding: 0.5rem;
    background: transparent;
    color: var(--text-muted);
    border: 1px solid transparent;
}

#copy-btn:hover {
    color: var(--text-main);
    background-color: rgba(255, 255, 255, 0.05);
}

#copy-btn.copied {
    color: var(--success);
}

.timer-container {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.timer-bar {
    flex-grow: 1;
    height: 6px;
    background-color: var(--bg-dark);
    border-radius: 3px;
    overflow: hidden;
}

.timer-progress {
    height: 100%;
    background-color: var(--primary);
    width: 100%;
    transition: width 1s linear, background-color 0.3s ease;
}

.timer-progress.warning {
    background-color: var(--error);
}

.timer-text {
    font-size: 0.875rem;
    color: var(--text-muted);
    min-width: 2.5rem;
    text-align: right;
}

footer {
    margin-top: 2rem;
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-muted);
}