:root {
    --color-bg: #f6f6f4;
    --color-surface: #ffffff;
    --color-surface-alt: #fbfbfa;
    --color-border: #e4e3de;
    --color-text: #2b2a27;
    --color-text-muted: #8a8980;
    --color-accent: #1f6f5c;
    --color-accent-hover: #17564a;
    --color-danger: #b3261e;
    --color-danger-bg: #fbeceb;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --radius: 10px;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 6px 20px rgba(0, 0, 0, 0.06);
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3 {
    margin: 0;
    font-weight: 600;
    letter-spacing: -0.01em;
}

table {
    border-collapse: collapse;
    width: 100%;
}

a {
    color: inherit;
}

.btn-primary,
.btn-secondary {
    display: inline-block;
    border: none;
    border-radius: 8px;
    padding: 0.7rem 1.4rem;
    font-size: 0.95rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    text-decoration: none;
    transition: background-color 0.15s ease, transform 0.05s ease;
}

.btn-primary {
    background: var(--color-accent);
    color: #ffffff;
}
.btn-primary:hover {
    background: var(--color-accent-hover);
}
.btn-primary:active {
    transform: scale(0.98);
}

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

.alert {
    border-radius: var(--radius);
    padding: 0.9rem 1.1rem;
    margin-bottom: 1.25rem;
    font-size: 0.9rem;
}
.alert p {
    margin: 0.2rem 0;
}
.alert-error {
    background: var(--color-danger-bg);
    color: var(--color-danger);
    border: 1px solid #f2c9c6;
}
.alert-success {
    background: #eaf6ee;
    color: #1c6b34;
    border: 1px solid #c7e8d1;
}