:root {
    --bg-color: #f4f4f5;
    --card-bg: #ffffff;
    --text-color: #18181b;
    --border-color: #e4e4e7;
    --accent-color: #09090b;
    --accent-text: #ffffff;
}

[data-theme="dark"] {
    --bg-color: #09090b;
    --card-bg: #141416;
    --text-color: #f4f4f5;
    --border-color: #27272a;
    --accent-color: #ffffff;
    --accent-text: #09090b;
}

* {
    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-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

h1 {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: -0.025em;
}

hr {
    border: 0;
    border-top: 1px solid var(--border-color);
    margin-bottom: 1.5rem;
}

.card-body p {
    font-size: 0.875rem;
    line-height: 1.5;
    margin-bottom: 2rem;
    opacity: 0.8;
}

.counter-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.display-number {
    font-size: 3rem;
    font-weight: 700;
    letter-spacing: -0.05em;
}

.button-group {
    display: flex;
    gap: 0.5rem;
    width: 100%;
}

button {
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-primary {
    flex: 1;
    background-color: var(--accent-color);
    color: var(--accent-text);
    border: 1px solid var(--accent-color);
}

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

.btn-secondary {
    background-color: transparent;
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

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