/* Design Tokens */
:root {
    --color-primary: #1e3a5f;
    --color-primary-hover: #15293f;
    --color-primary-light: #eaeef2;
    --color-accent: #c8a45c;
    --color-text: #1f2937;
    --color-text-muted: #6b7280;
    --color-border: #d1d5db;
    --color-bg: #f4f5f7;
    --color-surface: #ffffff;
    --color-danger: #b91c1c;
    --color-danger-hover: #991b1b;
    --color-success: #15803d;
    --radius: 6px;
}

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

body {
    font-family: 'Inter', 'Noto Sans KR', 'Nanum Gothic', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}

/* Screen Reader Only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px;
}

/* Navbar Styles */
.navbar {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    text-decoration: none;
    display: inline-block;
}

.navbar-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--color-text);
    padding: 0.5rem;
    line-height: 1;
}

.nav-list {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    list-style: none;
    gap: 1.5rem;
    margin: 0;
}

.nav-item {
    display: flex;
    align-items: center;
}

.nav-link {
    color: var(--color-text);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    padding: 0.5rem;
    transition: color 0.2s ease;
}

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

.btn-link {
    background: none;
    border: none;
    cursor: pointer;
    font: inherit;
    color: var(--color-text);
    padding: 0.5rem;
}

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

/* Language Switcher */
.language-switcher select {
    padding: 0.5rem;
    border: 1px solid var(--color-border);
    border-radius: 5px;
    font-size: 0.9rem;
    background: var(--color-surface);
    color: var(--color-text);
    cursor: pointer;
    min-width: 120px;
}

/* Responsive Navbar */
@media (max-width: 768px) {
    .container {
        padding: 12px;
    }

    .navbar {
        padding: 0.75rem 0;
        display: flex;
        align-items: center;
        justify-content: space-between;
    }

    .navbar-brand {
        font-size: 1.25rem;
        margin-left: 12px;
    }

    .navbar-toggle {
        display: block;
        position: absolute;
        right: 12px;
        top: 1rem;
    }

    .nav-list {
        display: none;
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
        padding: 1rem;
        width: 100%;
        background: var(--color-surface);
        border-top: 1px solid var(--color-border);
        position: absolute;
        top: 100%;
        left: 0;
        z-index: 999;
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    }

    .nav-list--open {
        display: flex;
    }

    .nav-item {
        width: 100%;
    }

    .nav-link,
    .btn-link {
        font-size: 0.95rem;
        padding: 0.6rem 1rem;
        display: block;
        width: 100%;
        text-align: left;
        border-radius: 4px;
    }

    .nav-link:hover,
    .btn-link:hover {
        background: var(--color-bg);
    }

    .language-switcher select {
        font-size: 0.85rem;
        padding: 0.5rem;
        width: 100%;
        margin: 0.5rem 1rem;
        border-radius: 4px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 8px;
    }

    .navbar {
        padding: 0.5rem 0;
    }

    .navbar-brand {
        font-size: 1.1rem;
        margin-left: 8px;
    }

    .navbar-toggle {
        font-size: 1.25rem;
        right: 8px;
        top: 0.8rem;
    }

    .nav-list {
        padding: 0.75rem;
    }

    .nav-link,
    .btn-link {
        font-size: 0.9rem;
        padding: 0.5rem 0.8rem;
    }

    .language-switcher select {
        font-size: 0.8rem;
        padding: 0.4rem;
        margin: 0.4rem 0.8rem;
    }
}

@media (max-width: 360px) {
    .container {
        padding: 6px;
    }

    .navbar-brand {
        font-size: 1rem;
        margin-left: 6px;
    }

    .navbar-toggle {
        font-size: 1.15rem;
        right: 6px;
        top: 0.7rem;
    }

    .nav-list {
        padding: 0.5rem;
    }

    .nav-link,
    .btn-link {
        font-size: 0.85rem;
        padding: 0.4rem 0.6rem;
    }

    .language-switcher select {
        font-size: 0.75rem;
        padding: 0.3rem;
        margin: 0.3rem 0.6rem;
    }
}

/* Accessibility */
.nav-link:focus,
.btn-link:focus,
.navbar-toggle:focus,
.language-switcher select:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(30, 58, 95, 0.3);
}

@media (prefers-reduced-motion: reduce) {
    .nav-link,
    .btn-link,
    .navbar-toggle {
        transition: none;
    }
}