:root {
    --font-ui: "Segoe UI", "Trebuchet MS", sans-serif;
    --font-mono: "Consolas", "Courier New", monospace;

    --color-bg: #f3f6fb;
    --color-surface: #ffffff;
    --color-surface-soft: #f8fbff;
    --color-border: #d8e2ee;
    --color-text: #1f2a37;
    --color-muted: #5b6b7f;

    --color-primary: #2f6fd7;
    --color-primary-strong: #245bb1;
    --color-danger: #c53a3a;
    --color-danger-strong: #a62f2f;
    --color-success: #1f7a4f;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --shadow-sm: 0 4px 12px rgba(32, 56, 85, 0.08);
    --shadow-md: 0 10px 24px rgba(32, 56, 85, 0.12);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-ui);
    background: var(--color-bg);
    color: var(--color-text);
}

.navbar {
    background: var(--color-surface);
    padding: 15px 0;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.nav-logo {
    color: var(--color-primary);
    font-size: 24px;
    font-weight: 700;
    text-decoration: none;
}

.nav-links a {
    color: var(--color-text);
    margin-left: 20px;
    text-decoration: none;
    font-weight: 600;
}

.nav-links a:hover {
    color: var(--color-primary);
}

.content-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px 20px 32px;
}

button,
.button,
input,
select {
    font: inherit;
}

button,
.button {
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    padding: 10px 14px;
    background: var(--color-primary);
    color: #ffffff;
    cursor: pointer;
    font-weight: 600;
    transition: background 0.2s ease, transform 0.2s ease;
}

button:hover,
.button:hover {
    background: var(--color-primary-strong);
    transform: translateY(-1px);
}

button:disabled,
.button:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

input,
select {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: #ffffff;
    color: var(--color-text);
}

/* Auth pages */
.login-container {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 80vh;
    text-align: center;
}

.login-title {
    font-size: 2rem;
    margin-bottom: 20px;
}

.login-box {
    background: var(--color-surface);
    padding: 30px;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.login-button {
    display: inline-flex;
    align-items: center;
    background: var(--color-primary);
    color: white;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-size: 18px;
    font-weight: bold;
}

.login-button:hover {
    filter: brightness(0.95);
}

.google-logo {
    width: 20px;
    height: 20px;
    margin-right: 10px;
}

.notice-page {
    max-width: 640px;
    margin: 72px auto;
    padding: 32px;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.notice-page h1 {
    margin-top: 0;
}

@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 12px;
    }
}