/* ============================================
   Travel Guide - Design System & Shared Styles
   ============================================ */

:root {
    /* Colors */
    --color-primary: #9E332E;
    --color-primary-light: #C04A45;
    --color-gold: #C5A365;
    --color-gold-light: #D4B87A;
    --color-paper: #FDFBF7;
    --color-bg: #EFEBE4;
    --color-dark: #1A1A1A;
    --color-gray: #5C5C5C;
    --color-gray-light: #9A9A9A;
    --color-border: rgba(0, 0, 0, 0.06);
    --color-white: #FFFFFF;

    /* Fonts */
    --font-sans: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-serif: 'Noto Serif SC', 'Songti SC', serif;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;

    /* Radius */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-xl: 2rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 20px 50px rgba(0, 0, 0, 0.15);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    color: var(--color-dark);
    background-color: var(--color-bg);
    line-height: 1.6;
    min-height: 100vh;
}

img {
    display: block;
    max-width: 100%;
}

a {
    color: inherit;
    text-decoration: none;
}

/* Typography */
.font-serif { font-family: var(--font-serif); }
.font-sans { font-family: var(--font-sans); }

.text-primary { color: var(--color-primary); }
.text-gold { color: var(--color-gold); }
.text-gray { color: var(--color-gray); }
.text-gray-light { color: var(--color-gray-light); }

/* Glass effect */
.glass {
    background: rgba(255, 255, 255, 0.65);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.5);
}

.glass-dark {
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Tags */
.tag {
    display: inline-block;
    padding: 0.2em 0.7em;
    font-size: 0.7rem;
    border-radius: var(--radius-full);
    background: var(--color-primary);
    color: var(--color-white);
    white-space: nowrap;
}

.tag--outline {
    background: transparent;
    border: 1px solid var(--color-gray-light);
    color: var(--color-gray);
}

.tag--gold {
    background: var(--color-gold);
    color: var(--color-white);
}

/* Breadcrumb */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.8rem;
    color: var(--color-gray-light);
    padding: var(--space-md) 0;
    flex-wrap: wrap;
}

.breadcrumb a {
    color: var(--color-gray);
    transition: color var(--transition-fast);
}

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

.breadcrumb .separator {
    color: var(--color-gray-light);
    font-size: 0.7rem;
}

.breadcrumb .current {
    color: var(--color-dark);
    font-weight: 500;
}

/* Back to top button */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--color-white);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-normal);
    z-index: 100;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
}

.back-to-top svg {
    width: 20px;
    height: 20px;
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

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

/* Footer */
.site-footer {
    background: var(--color-dark);
    color: rgba(255, 255, 255, 0.5);
    text-align: center;
    padding: 1.5rem var(--space-lg);
    font-size: 0.65rem;
}

.site-footer a {
    color: var(--color-gold);
}

/* Responsive */
@media (max-width: 640px) {
    :root {
        --space-lg: 1rem;
        --space-xl: 1.5rem;
        --space-2xl: 2rem;
    }
}