/* ==========================================================================
   Zen Tech - Premium Editorial Design System
   Inspired by Japanese Minimalism, Apple, and Vercel.
   ========================================================================== */

:root {
  /* Color Palette - Deep, Calm, Sophisticated */
  --color-bg: #0a0a0a; /* Deep Charcoal Black */
  --color-surface: #141414;
  --color-text: #e0e0e0;
  --color-text-muted: #888888;
  --color-accent: #a2917d; /* Muted Gold/Clay */
  --color-accent-soft: rgba(162, 145, 125, 0.1);
  --color-border: rgba(255, 255, 255, 0.08);
  --color-glass: rgba(20, 20, 20, 0.7);
  
  /* Typography System */
  --font-primary: 'Satoshi', 'Inter', sans-serif;
  --font-serif: 'Playfair Display', 'Noto Serif JP', serif;
  
  /* Layout & Spacing */
  --max-width: 1400px;
  --container-padding: 4rem;
  --article-width: 720px;
  --nav-height: 80px;
  --space-unit: 1rem;
  
  /* Animation Timing */
  --ease-premium: cubic-bezier(0.19, 1, 0.22, 1);
  --transition-slow: 0.8s var(--ease-premium);
  --transition-medium: 0.4s var(--ease-premium);
}

/* ==========================================================================
   Global Reset & Base
   ========================================================================== */

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

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

::selection {
  background: var(--color-accent);
  color: #fff;
}

/* ==========================================================================
   Layout Containers
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

.section {
  padding: 10rem 0;
}

/* Feed Container (Edge-to-Edge Mobile) */
@media (max-width: 768px) {
  .container-feed {
    padding-left: 0 !important;
    padding-right: 0 !important;
  }
}

/* ==========================================================================
   Typography
   ========================================================================== */

h1, h2, h3, h4 {
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.serif-display {
  font-family: var(--font-serif);
  font-style: italic;
}

.accent {
  color: var(--color-accent);
}

.hero-title {
  font-size: clamp(3rem, 8vw, 6.5rem);
  font-weight: 500;
  margin-bottom: 2rem;
  opacity: 0;
  transform: translateY(30px);
}

/* ==========================================================================
   Cinematic Hero
   ========================================================================== */

.zen-hero {
  position: relative;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding-top: var(--nav-height);
}

.hero-parallax-bg {
  position: absolute;
  top: -10%;
  left: -10%;
  width: 120%;
  height: 120%;
  z-index: 0;
  will-change: transform;
}

.hero-parallax-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.4) contrast(1.1);
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at center, transparent, var(--color-bg) 80%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 900px;
  padding: 0 2rem;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--color-text-muted);
  letter-spacing: 0.3em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
  opacity: 0;
}

/* ==========================================================================
   Navigation (Floating Glass)
   ========================================================================== */

.logo {
  font-family: var(--font-primary);
  font-weight: 600;
  letter-spacing: -0.05em;
  font-size: 1.4rem;
  color: #fff !important;
  text-decoration: none;
}

.navbar {
  position: fixed;
  top: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  width: 90%;
  max-width: 1100px;
  height: 56px;
  background: rgba(10, 10, 10, 0.7);
  backdrop-filter: blur(24px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 100px;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  transition: all 0.5s var(--ease-premium);
}

.navbar.scrolled {
  top: 0.75rem;
  width: 95%;
  height: 52px;
  background: rgba(10, 10, 10, 0.85);
  border-color: rgba(255, 255, 255, 0.15);
}

.nav-links {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 2.5rem;
  list-style: none;
  margin: 0;
}

.nav-links a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  transition: color 0.3s;
}

.nav-links a:hover, .nav-links a.active {
  color: #fff;
}

/* ==========================================================================
   Animations
   ========================================================================== */

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 1s var(--ease-premium);
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* --- Architectural Cursor --- */
.custom-cursor {
  width: 20px;
  height: 20px;
  background: var(--color-accent);
  border-radius: 50%;
  position: fixed;
  pointer-events: none;
  z-index: 9999;
  mix-blend-mode: difference;
  transition: transform 0.2s cubic-bezier(0.2, 0.8, 0.2, 1), opacity 0.3s;
  transform: translate(-50%, -50%) scale(0.5);
}

.custom-cursor.hover {
  transform: translate(-50%, -50%) scale(2.5);
  background: #fff;
}

@media (pointer: coarse) {
  .custom-cursor { display: none !important; }
}

/* --- Back to Top --- */
#back-to-top {
  position: fixed;
  bottom: 3rem;
  right: 3rem;
  width: 50px;
  height: 50px;
  background: var(--color-glass);
  backdrop-filter: blur(10px);
  border: 1px solid var(--color-border);
  border-radius: 50%;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 1000;
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.5s var(--ease-premium);
}

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

#back-to-top:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  transform: scale(1.1);
}

/* --- Search Overlay Fixes --- */
.search-overlay {
  transition: opacity 0.5s var(--ease-premium), visibility 0.5s;
  overflow-y: auto;
}

@media (max-width: 768px) {
  .search-overlay {
    padding: 4rem 1.5rem !important;
  }
  .search-container input {
    font-size: 2rem !important;
  }
}

/* ==========================================================================
   Responsive Design (Zen Editorial Adaptation)
   ========================================================================== */

/* --- Article Layout --- */
.post-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 6rem;
}

@media (max-width: 1024px) {
  :root {
    --max-width: 90%;
  }
  
  .post-layout {
    grid-template-columns: 1fr;
    gap: 4rem;
  }
  
  .post-sidebar {
    display: none;
  }
  
  .zen-hero h1 {
    font-size: 5rem;
  }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 70px;
    --article-width: 100%;
    --container-padding: 1.5rem;
  }

  .container {
    padding-left: var(--container-padding);
    padding-right: var(--container-padding);
  }

  .navbar {
    top: 1rem;
    width: 95%;
    padding: 0 1.5rem;
  }

  .nav-links {
    display: none; /* Toggle handled via JS */
    position: static;
    transform: none;
    left: auto;
  }

  .nav-text-desktop {
    display: none;
  }

  .menu-btn {
    display: block !important;
  }

  .zen-hero h1 {
    font-size: 3rem;
  }

  .hero-content {
    padding: 0 1.5rem;
  }

  .container {
    padding: 0 1.5rem !important;
  }

  .posts-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .article-header h1 {
    font-size: 2.5rem !important;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .search-overlay {
    padding: 6rem 1.5rem;
  }
}

/* Mobile Menu Overlay State */
.nav-links.mobile-active {
  display: flex !important;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background: var(--color-bg);
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 3rem;
  z-index: 2500;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-links.mobile-active li {
  opacity: 0;
  transform: translateY(20px);
  animation: slideUp 0.5s var(--ease-premium) forwards;
}

@keyframes slideUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
/* ==========================================================================
   Article Layout & Typography (Zen Editorial)
   ========================================================================== */

.article-header {
  text-align: center;
  margin-bottom: 6rem;
}

.article-title {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  color: #fff;
  margin-top: 2rem;
  line-height: 1.1;
  font-weight: 400;
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--color-accent);
}

.post-category {
  color: var(--color-accent);
}

.article-featured-image {
  width: 100%;
  height: 70vh;
  object-fit: cover;
  border-radius: 8px;
  margin-bottom: 8rem;
}

.article-content {
  font-size: 1.15rem;
  line-height: 1.8;
  color: var(--color-text-muted);
  max-width: var(--article-width);
  margin: 0 auto;
}

.article-content h2 {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  color: #fff;
  margin: 6rem 0 2rem;
  font-weight: 400;
}

.article-content h3 {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  color: #fff;
  margin: 4rem 0 1.5rem;
}

.article-content p {
  margin-bottom: 2rem;
}

.article-content b, .article-content strong {
  color: #fff;
  font-weight: 600;
}

.article-content ul, .article-content ol {
  margin: 2rem 0;
  padding-left: 1.5rem;
}

.article-content li {
  margin-bottom: 1rem;
}

.article-content blockquote {
  margin: 4rem 0;
  padding: 2rem 3rem;
  border-left: 2px solid var(--color-accent);
  background: var(--color-surface);
  font-style: italic;
  font-size: 1.25rem;
  color: #fff;
}

.article-content img {
  width: 100%;
  height: auto;
  border-radius: 8px;
  margin: 4rem 0;
}

/* Base Utility */
.zen-theme {
  /* Placeholder for theme-specific variables */
}

/* Animations */
.hero-title, .hero-subtitle, .hero-actions {
  opacity: 0;
  transform: translateY(30px);
}