/*
Theme Name: Istanbul Trends
Theme URI: https://istanbultrends.com
Author: Istanbul Studio
Author URI: https://istanbulstudio.com
Description: Production-grade travel & lifestyle guide theme for Istanbul. Notion-inspired minimal design, optimized for SEO, speed, and conversions.
Version: 1.0.0
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: istanbul-trends
Tags: travel, lifestyle, blog, editorial, minimal, seo-optimized

This theme is built for Istanbul Trends - The Ultimate Digital Hub for Istanbul.
*/

/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,400;0,9..144,600;0,9..144,700;1,9..144,400&family=Crimson+Pro:ital,wght@0,400;0,600;1,400&display=swap');

/* ============================================
   CSS VARIABLES - NOTION COLOR PALETTE
   ============================================ */
:root {
  /* Notion-inspired Grayscale */
  --color-white: #ffffff;
  --color-gray-50: #f7f6f3;
  --color-gray-100: #ebeae6;
  --color-gray-200: #e3e2df;
  --color-gray-300: #d1d0cd;
  --color-gray-400: #b4b3b0;
  --color-gray-500: #8f8e8b;
  --color-gray-600: #6b6a67;
  --color-gray-700: #4d4c49;
  --color-gray-800: #373633;
  --color-gray-900: #25241f;
  --color-black: #1a1918;
  
  /* Accent Colors */
  --color-accent: #0066cc;
  --color-accent-hover: #0052a3;
  --color-success: #0f7b6c;
  --color-warning: #f59e0b;
  
  /* Typography */
  --font-display: 'Fraunces', serif;
  --font-body: 'Crimson Pro', serif;
  --font-ui: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', sans-serif;
  
  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;
  
  /* Layout */
  --container-max: 1280px;
  --container-reading: 720px;
  --header-height: 80px;
  
  /* Effects */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

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

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

body {
  font-family: var(--font-body);
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--color-gray-900);
  background: var(--color-white);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.2;
  color: var(--color-black);
  margin-bottom: var(--space-md);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); font-weight: 700; letter-spacing: -0.02em; }
h2 { font-size: clamp(2rem, 4vw, 3rem); letter-spacing: -0.01em; }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1.125rem; font-weight: 500; }

p { margin-bottom: var(--space-md); color: var(--color-gray-700); }
a { color: var(--color-accent); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--color-accent-hover); }
strong { font-weight: 600; color: var(--color-gray-900); }

/* Layout */
.container { max-width: var(--container-max); margin: 0 auto; padding: 0 var(--space-md); }
.container-reading { max-width: var(--container-reading); margin: 0 auto; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-gray-200);
  height: var(--header-height);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.site-logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-black);
  letter-spacing: -0.02em;
}

.main-nav ul {
  display: flex;
  list-style: none;
  gap: var(--space-lg);
}

.main-nav a {
  font-family: var(--font-ui);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-gray-700);
  position: relative;
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition-base);
}

.main-nav a:hover::after { width: 100%; }

/* Hero */
.hero {
  padding: var(--space-3xl) 0;
  text-align: center;
  background: linear-gradient(180deg, var(--color-gray-50) 0%, var(--color-white) 100%);
}

/* Pillars */
.pillars-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-lg);
  margin: var(--space-3xl) 0;
}

.pillar-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--transition-base);
}

.pillar-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

/* Tables */
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-xl) 0;
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.comparison-table th {
  background: var(--color-gray-50);
  padding: var(--space-md);
  font-family: var(--font-ui);
  font-weight: 600;
  text-align: left;
}

.comparison-table td {
  padding: var(--space-md);
  border-bottom: 1px solid var(--color-gray-200);
}

/* Footer */
.site-footer {
  background: var(--color-gray-900);
  color: var(--color-gray-400);
  padding: var(--space-3xl) 0 var(--space-lg);
  margin-top: var(--space-3xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-2xl);
}

/* Mobile */
@media (max-width: 768px) {
  .main-nav ul { flex-direction: column; }
  .pillars-grid { grid-template-columns: 1fr; }
}