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

:root {
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --border-color: #2e2e2e;
    --text-primary: #ffffff;
    --text-secondary: #888888;
    --text-hint: #666666;
    --accent-color: #ffffff;
    --error-color: #f87171;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

.app-container {
    width: 100%;
    max-width: 400px;
    padding: 24px;
    text-align: center;
}

/* ===== Setup Card ===== */
.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 32px 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.setup-title {
    font-size: 1.25rem;
    font-weight: 600;
}

.setup-desc {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: -10px;
}

.input-group {
    display: flex;
    gap: 10px;
}

.input-group input {
    flex: 1;
    height: 44px;
    padding: 0 16px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background-color: #161616;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    outline: none;
}

.input-group input:focus {
    border-color: #555555;
}

.btn-primary {
    height: 44px;
    padding: 0 20px;
    border-radius: 6px;
    border: none;
    background-color: #ffffff;
    color: #121212;
    font-weight: 500;
    cursor: pointer;
    transition: opacity 0.2s;
    white-space: nowrap;
    flex-shrink: 0;
}

.btn-primary:hover {
    opacity: 0.9;
}

.setup-hint {
    font-size: 0.75rem;
    color: var(--text-hint);
    line-height: 1.4;
}

/* ===== Code View ===== */
.code-view {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.title {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.code-box {
    width: 100%;
    max-width: 280px;
    background-color: #1a1a1a;
    border: 1px solid #2d2d2d;
    border-radius: 8px;
    padding: 16px 0;
    cursor: pointer;
    transition: background-color 0.2s;
}

.code-box:hover {
    background-color: #222222;
}

.code-text {
    font-family: var(--font-mono);
    font-size: 3rem;
    font-weight: 500;
    color: var(--text-primary);
    letter-spacing: 0.05em;
    user-select: none;
}

.countdown {
    font-size: 1rem;
    color: var(--text-secondary);
}

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

/* ===== Toast ===== */
.toast {
    position: fixed;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    background-color: #333333;
    color: #ffffff;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.875rem;
    z-index: 10;
    box-shadow: 0 4px 12px rgba(0,0,0,0.5);
    animation: fadeIn 0.15s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translate(-50%, 10px); }
    to { opacity: 1; transform: translate(-50%, 0); }
}

/* ===== Error Banner ===== */
.error-banner {
    color: var(--error-color);
    font-size: 0.875rem;
    margin-top: 10px;
}

/* ===== Footer ===== */
.footer {
    margin-top: 20px;
}

.btn-link {
    background: none;
    border: none;
    color: var(--text-hint);
    font-size: 0.875rem;
    cursor: pointer;
    text-decoration: underline;
}

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

.hidden {
    display: none !important;
}