/* ============================================
   Day Trips From Athens -- Modern Travel Blog
   Mobile-first, Mediterranean palette
   ============================================ */

/* --- Custom Properties --- */
:root {
    --color-bg: #FAFAF7;
    --color-surface: #F0E9DF;
    --color-primary: #1A6FB5;
    --color-primary-dark: #0D4A7A;
    --color-accent: #C4573A;
    --color-accent-warm: #D4A037;
    --color-text: #2C2C2C;
    --color-text-secondary: #6B6B6B;
    --color-text-inverse: #FFFFFF;

    --font-heading: 'Playfair Display', Georgia, serif;
    --font-body: 'Lato', -apple-system, BlinkMacSystemFont, sans-serif;

    --fs-hero: clamp(2.8rem, 10vw, 6rem);
    --fs-h1: clamp(2rem, 6vw, 3.5rem);
    --fs-h2: clamp(1.5rem, 3.5vw, 2rem);
    --fs-h3: clamp(1.2rem, 2.5vw, 1.4rem);
    --fs-body: clamp(1rem, 2.5vw, 1.125rem);
    --fs-small: clamp(0.8rem, 2vw, 0.875rem);

    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 2px 12px rgba(0,0,0,0.08);
    --shadow-hover: 0 12px 32px rgba(0,0,0,0.15);
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-body);
    font-size: var(--fs-body);
    line-height: 1.65;
    color: var(--color-text);
    background: var(--color-bg);
    overflow-x: hidden;
}

a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-accent); }

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

/* --- Progress Bar --- */
.progress-bar {
    position: fixed;
    top: 0; left: 0;
    height: 3px;
    width: 0;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    z-index: 1000;
    transition: width 0.1s linear;
}

/* --- Header --- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 900;
    background: rgba(250, 250, 247, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(0,0,0,0.06);
    transition: background var(--transition), box-shadow var(--transition);
}

.site-header.scrolled {
    background: rgba(250, 250, 247, 0.95);
    box-shadow: 0 2px 20px rgba(0,0,0,0.08);
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.site-logo {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    font-weight: 900;
    color: var(--color-text);
    letter-spacing: -0.02em;
}
.site-logo span {
    color: var(--color-primary);
}
.site-logo:hover { color: var(--color-text); }

/* Hamburger */
.nav-toggle { display: none; }

.nav-toggle-label {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    cursor: pointer;
    z-index: 1001;
}

.nav-toggle-label span,
.nav-toggle-label span::before,
.nav-toggle-label span::after {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: all var(--transition);
    position: relative;
}

.nav-toggle-label span::before,
.nav-toggle-label span::after {
    content: '';
    position: absolute;
    left: 0;
    width: 100%;
}
.nav-toggle-label span::before { top: -7px; }
.nav-toggle-label span::after { top: 7px; }

.nav-toggle:checked + .nav-toggle-label span { background: transparent; }
.nav-toggle:checked + .nav-toggle-label span::before { top: 0; transform: rotate(45deg); }
.nav-toggle:checked + .nav-toggle-label span::after { top: 0; transform: rotate(-45deg); }

/* Mobile nav overlay */
.site-nav {
    position: fixed;
    top: 0; right: 0;
    width: 80vw;
    max-width: 320px;
    height: 100vh;
    background: var(--color-primary-dark);
    transform: translateX(100%);
    transition: transform var(--transition);
    z-index: 999;
    padding: 100px 40px 40px;
}

.nav-toggle:checked ~ .site-nav {
    transform: translateX(0);
}

.site-nav ul { list-style: none; }

.site-nav li { margin-bottom: 8px; }

.site-nav a {
    color: var(--color-text-inverse);
    font-size: 1.2rem;
    font-weight: 700;
    display: block;
    padding: 12px 0;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    transition: padding-left var(--transition);
}
.site-nav a:hover {
    color: var(--color-accent-warm);
    padding-left: 8px;
}

/* Desktop nav */
@media (min-width: 768px) {
    .nav-toggle-label { display: none; }

    .site-nav {
        position: static;
        width: auto;
        max-width: none;
        height: auto;
        background: none;
        transform: none;
        padding: 0;
    }

    .site-nav ul {
        display: flex;
        gap: 2rem;
    }

    .site-nav li { margin-bottom: 0; }

    .site-nav a {
        color: var(--color-text-secondary);
        font-size: var(--fs-small);
        font-weight: 700;
        text-transform: uppercase;
        letter-spacing: 0.05em;
        padding: 8px 0;
        border-bottom: 2px solid transparent;
    }
    .site-nav a:hover {
        color: var(--color-primary);
        padding-left: 0;
        border-bottom-color: var(--color-primary);
    }
}

/* --- Hero Section --- */
.hero {
    position: relative;
    min-height: 100vh;
    min-height: 100svh;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding: 80px 24px;
    background: linear-gradient(135deg, #0D4A7A 0%, #1A6FB5 40%, #2E9BB0 70%, #C4573A 100%);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 50% at 20% 80%, rgba(196,87,58,0.3), transparent),
        radial-gradient(ellipse 60% 40% at 80% 20%, rgba(212,160,55,0.2), transparent);
    pointer-events: none;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.5) 0%, rgba(0,0,0,0.1) 50%, transparent 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 700px;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: var(--fs-hero);
    font-weight: 900;
    color: var(--color-text-inverse);
    line-height: 1.05;
    margin-bottom: 20px;
    text-shadow: 0 2px 30px rgba(0,0,0,0.3);
}

.hero-tagline {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    color: rgba(255,255,255,0.9);
    line-height: 1.5;
    margin-bottom: 32px;
    font-weight: 400;
}

.hero-cta {
    display: inline-block;
    padding: 16px 40px;
    border: 2px solid rgba(255,255,255,0.8);
    border-radius: 50px;
    color: var(--color-text-inverse);
    font-weight: 700;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    transition: all var(--transition);
}
.hero-cta:hover {
    background: var(--color-text-inverse);
    color: var(--color-primary-dark);
    border-color: var(--color-text-inverse);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.2);
}

/* --- Filter Bar --- */
.trips-section {
    padding: 0 0 80px;
}

.filter-bar {
    position: sticky;
    top: 64px;
    z-index: 800;
    background: var(--color-bg);
    border-bottom: 1px solid rgba(0,0,0,0.06);
    padding: 16px 0;
}

.filter-scroll {
    display: flex;
    gap: 8px;
    padding: 0 20px;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    scrollbar-width: none;
    max-width: 1200px;
    margin: 0 auto;
}
.filter-scroll::-webkit-scrollbar { display: none; }

.filter-btn {
    flex-shrink: 0;
    scroll-snap-align: start;
    padding: 10px 20px;
    border: 1.5px solid rgba(0,0,0,0.12);
    border-radius: 50px;
    background: transparent;
    color: var(--color-text-secondary);
    font-family: var(--font-body);
    font-size: var(--fs-small);
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}
.filter-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}
.filter-btn.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-text-inverse);
}

/* --- Card Grid --- */
.card-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 32px 20px;
    max-width: 1200px;
    margin: 0 auto;
}

@media (min-width: 640px) {
    .card-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
    .card-grid { grid-template-columns: repeat(3, 1fr); }
    .card-grid .card:first-child {
        grid-column: span 2;
    }
    .card-grid .card:first-child .card-title {
        font-size: var(--fs-h2);
    }
}

/* --- Card --- */
.card {
    display: block;
    border-radius: var(--radius);
    overflow: hidden;
    background: var(--color-text-inverse);
    box-shadow: var(--shadow);
    transition: transform var(--transition), box-shadow var(--transition);
    text-decoration: none;
    color: inherit;
}
.card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
    color: inherit;
}

.card-image {
    position: relative;
    aspect-ratio: 16 / 10;
    display: flex;
    align-items: flex-end;
    padding: 20px;
    overflow: hidden;
}

.card-image-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.6) 0%, rgba(0,0,0,0.1) 50%, transparent 100%);
    transition: opacity var(--transition);
}
.card:hover .card-image-overlay {
    opacity: 0.8;
}

.card-category {
    position: absolute;
    top: 16px;
    left: 16px;
    padding: 4px 12px;
    background: rgba(0,0,0,0.3);
    backdrop-filter: blur(8px);
    border-radius: 50px;
    color: var(--color-text-inverse);
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    z-index: 2;
}

.card-title {
    position: relative;
    z-index: 2;
    font-family: var(--font-heading);
    font-size: var(--fs-h3);
    font-weight: 700;
    color: var(--color-text-inverse);
    line-height: 1.2;
    text-shadow: 0 1px 8px rgba(0,0,0,0.3);
}

.card-body {
    padding: 16px 20px 20px;
}

.card-lead {
    font-size: var(--fs-small);
    color: var(--color-text-secondary);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 12px;
}

.card-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.meta-item {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.meta-item::before {
    content: '';
    display: inline-block;
    width: 4px;
    height: 4px;
    background: var(--color-accent-warm);
    border-radius: 50%;
    margin-right: 6px;
    vertical-align: middle;
}

.meta-item:first-child::before { display: none; }

/* --- Article Hero --- */
.article-hero {
    position: relative;
    min-height: 50vh;
    display: flex;
    align-items: flex-end;
    padding: 80px 24px 48px;
}

.article-hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.6) 0%, rgba(0,0,0,0.15) 60%, transparent 100%);
}

.article-hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
}

.article-category-tag {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(255,255,255,0.15);
    backdrop-filter: blur(8px);
    border-radius: 50px;
    color: var(--color-text-inverse);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 16px;
}

.article-title {
    font-family: var(--font-heading);
    font-size: var(--fs-h1);
    font-weight: 900;
    color: var(--color-text-inverse);
    line-height: 1.1;
    margin-bottom: 16px;
    text-shadow: 0 2px 20px rgba(0,0,0,0.3);
}

.article-meta-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

.article-meta-bar .meta-item {
    color: rgba(255,255,255,0.85);
}

.article-meta-bar .meta-item::before {
    background: rgba(255,255,255,0.5);
}

/* --- Article Content --- */
.article-content {
    max-width: 720px;
    margin: 0 auto;
    padding: 40px 24px 80px;
}

.article-lead {
    font-size: clamp(1.1rem, 2.5vw, 1.25rem);
    color: var(--color-text);
    line-height: 1.6;
    font-weight: 400;
    font-style: italic;
    border-left: 3px solid var(--color-accent);
    padding-left: 20px;
    margin-bottom: 32px;
}

/* TOC */
.article-toc {
    background: var(--color-surface);
    border-radius: var(--radius-sm);
    padding: 16px 20px;
    margin-bottom: 40px;
}

.article-toc summary {
    font-weight: 700;
    font-size: var(--fs-small);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-secondary);
    cursor: pointer;
    list-style: none;
}
.article-toc summary::-webkit-details-marker { display: none; }
.article-toc summary::before {
    content: '+ ';
    font-weight: 400;
}
.article-toc[open] summary::before {
    content: '- ';
}

.article-toc nav {
    margin-top: 12px;
}

.article-toc ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.article-toc a {
    display: block;
    padding: 6px 0;
    font-size: var(--fs-small);
    color: var(--color-primary);
    border-bottom: 1px solid rgba(0,0,0,0.04);
}
.article-toc a:hover {
    color: var(--color-accent);
}

/* Article body typography */
.article-body h2 {
    font-family: var(--font-heading);
    font-size: var(--fs-h2);
    font-weight: 700;
    color: var(--color-text);
    margin-top: 56px;
    margin-bottom: 20px;
    padding-top: 24px;
    border-top: 1px solid rgba(0,0,0,0.06);
}

.article-body h2:first-child {
    margin-top: 0;
    padding-top: 0;
    border-top: none;
}

.article-body h3 {
    font-family: var(--font-heading);
    font-size: var(--fs-h3);
    font-weight: 700;
    color: var(--color-text);
    margin-top: 36px;
    margin-bottom: 12px;
}

.article-body p {
    margin-bottom: 20px;
}

.article-body ul, .article-body ol {
    margin-bottom: 20px;
    padding-left: 24px;
}

.article-body li {
    margin-bottom: 8px;
}

.article-body strong {
    font-weight: 700;
    color: var(--color-text);
}

.article-body blockquote {
    border-left: 3px solid var(--color-accent);
    padding: 12px 20px;
    margin: 24px 0;
    background: var(--color-surface);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-style: italic;
}

/* Tables */
.article-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
    font-size: var(--fs-small);
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.article-body thead {
    background: var(--color-primary-dark);
    color: var(--color-text-inverse);
}

.article-body th {
    padding: 12px 16px;
    text-align: left;
    font-weight: 700;
    white-space: nowrap;
}

.article-body td {
    padding: 12px 16px;
    border-bottom: 1px solid rgba(0,0,0,0.06);
}

.article-body tbody tr:nth-child(even) {
    background: var(--color-surface);
}

.article-body tbody tr:hover {
    background: rgba(26,111,181,0.05);
}

/* Horizontal rules */
.article-body hr {
    border: none;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-accent-warm), transparent);
    margin: 48px 0;
}

/* --- Related Section --- */
.related-section {
    background: var(--color-surface);
    padding: 64px 0;
}

.related-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.related-heading {
    font-family: var(--font-heading);
    font-size: var(--fs-h2);
    text-align: center;
    margin-bottom: 40px;
}

.related-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}

@media (min-width: 640px) {
    .related-grid { grid-template-columns: repeat(3, 1fr); }
}

/* --- Footer --- */
.site-footer {
    background: var(--color-primary-dark);
    color: rgba(255,255,255,0.7);
    padding: 48px 20px;
    text-align: center;
}

.footer-brand {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--color-text-inverse);
    margin-bottom: 8px;
}

.footer-tagline {
    font-size: var(--fs-small);
    margin-bottom: 24px;
}

.footer-copy {
    font-size: 0.75rem;
    opacity: 0.5;
}

/* --- Back to Top --- */
.back-to-top {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: none;
    background: var(--color-primary);
    color: var(--color-text-inverse);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 16px rgba(0,0,0,0.2);
    opacity: 0;
    transform: translateY(20px);
    transition: all var(--transition);
    z-index: 800;
}
.back-to-top.visible {
    opacity: 1;
    transform: translateY(0);
}
.back-to-top:hover {
    background: var(--color-accent);
    transform: translateY(-2px);
}

/* --- Scroll Reveal --- */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger effect for grid children */
.card-grid .reveal:nth-child(3n+2) { transition-delay: 0.1s; }
.card-grid .reveal:nth-child(3n+3) { transition-delay: 0.2s; }

/* --- Hidden cards (filter) --- */
.card.hidden {
    display: none;
}

/* --- Reduced motion --- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
    .reveal { opacity: 1; transform: none; }
    html { scroll-behavior: auto; }
}

/* --- Print --- */
@media print {
    .site-header, .site-footer, .filter-bar, .back-to-top,
    .progress-bar, .related-section, .article-toc { display: none; }
    .article-hero { min-height: auto; padding: 20px; }
    .article-content { padding: 0; }
    body { font-size: 12pt; }
}