/* ============================================
   APERTURO THEME SYSTEM
   Light & Dark Theme with CSS Custom Properties
   ============================================ */

/* ============================================
   DESIGN TOKENS - LIGHT THEME (Default)
   ============================================ */

:root {
  /* === COLORS === */
  --bg-primary: #FAFAF8;
  --bg-secondary: #F5F4F2;
  --bg-card: #FFFFFF;
  --bg-overlay: rgba(250, 250, 248, 0.95);

  --text-primary: #1A1918;
  --text-secondary: #4A4745;
  --text-muted: #6B6966;

  --accent: #8B7355;
  --accent-hover: #6B5A45;
  --accent-light: rgba(139, 115, 85, 0.1);

  --border-color: rgba(26, 25, 24, 0.08);
  --border-strong: rgba(26, 25, 24, 0.15);

  /* === SHADOWS === */
  --shadow-sm: 0 2px 8px rgba(26, 25, 24, 0.06);
  --shadow-md: 0 4px 24px rgba(26, 25, 24, 0.08);
  --shadow-lg: 0 8px 40px rgba(26, 25, 24, 0.1);
  --shadow-hover: 0 12px 48px rgba(26, 25, 24, 0.12);

  /* === HERO SECTION === */
  --hero-brightness: 1;
  --hero-saturation: 1;
  --hero-overlay: linear-gradient(
    to bottom,
    transparent 0%,
    transparent 50%,
    rgba(250, 250, 248, 0.4) 75%,
    rgba(250, 250, 248, 0.85) 90%,
    rgba(250, 250, 248, 1) 100%
  );
  --hero-text-color: #FFFFFF;
  --hero-text-stroke: none;
  --hero-text-shadow: none;
  --hero-subtitle-color: rgba(255, 255, 255, 0.7);

  /* === NAVIGATION === */
  --nav-bg: rgba(250, 250, 248, 0.92);
  --nav-border: rgba(26, 25, 24, 0.06);
  --nav-link-color: rgba(26, 25, 24, 0.6);
  --nav-link-hover: #1A1918;

  /* === LOGO === */
  --logo-filter: brightness(0);

  /* === MOBILE MENU === */
  --mobile-menu-bg: rgba(250, 250, 248, 0.98);
  --mobile-link-color: rgba(26, 25, 24, 0.7);

  /* === FOOTER === */
  --footer-border: rgba(26, 25, 24, 0.06);
  --footer-text: rgba(26, 25, 24, 0.4);

  /* === SCROLL INDICATOR === */
  --scroll-text-color: rgba(26, 25, 24, 0.4);
  --scroll-line-color: rgba(26, 25, 24, 0.3);

  /* === CURSOR (Hero) === */
  --cursor-border: rgba(26, 25, 24, 0.15);
  --cursor-dot: rgba(26, 25, 24, 0.5);

  /* === PROJECT CARDS === */
  --card-overlay-bg: linear-gradient(to top, rgba(255,255,255,0.98) 0%, rgba(255,255,255,0.85) 60%, transparent 100%);
  --card-title-color: #1A1918;
  --card-meta-color: #6B6966;

  /* === FORMS === */
  --input-bg: rgba(26, 25, 24, 0.03);
  --input-border: rgba(26, 25, 24, 0.1);
  --input-focus-border: var(--accent);
  --input-text: #1A1918;
  --input-placeholder: #8A8785;

  /* === BUTTONS === */
  --btn-primary-bg: var(--accent);
  --btn-primary-text: #FFFFFF;
  --btn-primary-hover: var(--accent-hover);
  --btn-secondary-bg: transparent;
  --btn-secondary-border: var(--border-strong);
  --btn-secondary-text: var(--text-primary);

  /* === FORM ELEMENTS === */
  --input-focus-bg: rgba(26, 25, 24, 0.05);
  --select-arrow: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='rgba(26,25,24,0.5)' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  --button-text: #FFFFFF;
  --accent-glow: 0 10px 30px rgba(139, 115, 85, 0.3);
  --border-subtle: rgba(26, 25, 24, 0.08);

  /* === SUCCESS/ERROR === */
  --success-bg: rgba(139, 115, 85, 0.1);
  --success-border: rgba(139, 115, 85, 0.3);
  --error-bg: rgba(220, 53, 69, 0.1);
  --error-border: rgba(220, 53, 69, 0.3);
  --error-text: #dc3545;
}

/* ============================================
   DESIGN TOKENS - DARK THEME
   ============================================ */

[data-theme="dark"] {
  /* === COLORS === */
  --bg-primary: #080706;
  --bg-secondary: #0f0d0b;
  --bg-card: #141210;
  --bg-overlay: rgba(8, 7, 6, 0.95);

  --text-primary: #FAF8F5;
  --text-secondary: #C5C2BF;
  --text-muted: rgba(255, 255, 255, 0.5);

  --accent: #B8860B;
  --accent-hover: #D4A017;
  --accent-light: rgba(184, 134, 11, 0.15);

  --border-color: rgba(255, 255, 255, 0.06);
  --border-strong: rgba(255, 255, 255, 0.12);

  /* === SHADOWS === */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 4px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.45);
  --shadow-hover: 0 12px 48px rgba(0, 0, 0, 0.5);

  /* === HERO SECTION === */
  --hero-brightness: 0.85;
  --hero-saturation: 1.1;
  --hero-overlay: linear-gradient(
    to bottom,
    transparent 0%,
    transparent 60%,
    rgba(8, 7, 6, 0.3) 75%,
    rgba(8, 7, 6, 0.7) 90%,
    rgba(8, 7, 6, 1) 100%
  );
  --hero-text-color: #000000;
  --hero-text-stroke: none;
  --hero-text-shadow: none;
  --hero-subtitle-color: rgba(0, 0, 0, 0.6);

  /* === NAVIGATION === */
  --nav-bg: rgba(8, 7, 6, 0.9);
  --nav-border: rgba(255, 255, 255, 0.05);
  --nav-link-color: rgba(255, 255, 255, 0.5);
  --nav-link-hover: #FFFFFF;

  /* === LOGO === */
  --logo-filter: brightness(0) invert(1);

  /* === MOBILE MENU === */
  --mobile-menu-bg: rgba(8, 7, 6, 0.98);
  --mobile-link-color: rgba(255, 255, 255, 0.7);

  /* === FOOTER === */
  --footer-border: rgba(255, 255, 255, 0.05);
  --footer-text: rgba(255, 255, 255, 0.3);

  /* === SCROLL INDICATOR === */
  --scroll-text-color: rgba(255, 255, 255, 0.3);
  --scroll-line-color: rgba(255, 255, 255, 0.3);

  /* === CURSOR (Hero) === */
  --cursor-border: rgba(255, 255, 255, 0.15);
  --cursor-dot: rgba(255, 255, 255, 0.6);

  /* === PROJECT CARDS === */
  --card-overlay-bg: linear-gradient(to top, rgba(8,7,6,0.95) 0%, rgba(8,7,6,0.6) 60%, transparent 100%);
  --card-title-color: #FFFFFF;
  --card-meta-color: rgba(255, 255, 255, 0.5);

  /* === FORMS === */
  --input-bg: rgba(255, 255, 255, 0.03);
  --input-border: rgba(255, 255, 255, 0.1);
  --input-focus-border: var(--accent);
  --input-text: #FAF8F5;
  --input-placeholder: rgba(255, 255, 255, 0.4);

  /* === BUTTONS === */
  --btn-primary-bg: var(--accent);
  --btn-primary-text: var(--bg-primary);
  --btn-primary-hover: var(--accent-hover);
  --btn-secondary-bg: transparent;
  --btn-secondary-border: var(--border-strong);
  --btn-secondary-text: var(--text-primary);

  /* === FORM ELEMENTS === */
  --input-focus-bg: rgba(255, 255, 255, 0.05);
  --select-arrow: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='rgba(255,255,255,0.5)' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  --button-text: var(--bg-primary);
  --accent-glow: 0 10px 30px rgba(184, 134, 11, 0.3);
  --border-subtle: rgba(255, 255, 255, 0.05);

  /* === SUCCESS/ERROR === */
  --success-bg: rgba(184, 134, 11, 0.1);
  --success-border: rgba(184, 134, 11, 0.3);
  --error-bg: rgba(220, 53, 69, 0.1);
  --error-border: rgba(220, 53, 69, 0.3);
  --error-text: #ff6b6b;
}

/* ============================================
   THEME TOGGLE BUTTON
   ============================================ */

.theme-toggle {
  position: relative;
  width: 52px;
  height: 28px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 100px;
  cursor: pointer;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 7px;
  transition: background 0.3s ease, border-color 0.3s ease;
  flex-shrink: 0;
}

.theme-toggle:hover {
  border-color: var(--border-strong);
}

.theme-toggle:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.theme-toggle:focus:not(:focus-visible) {
  outline: none;
}

/* Thumb / Sliding indicator */
.theme-toggle::after {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  background: var(--accent);
  border-radius: 50%;
  top: 3px;
  left: 4px;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow-sm);
}

[data-theme="dark"] .theme-toggle::after {
  transform: translateX(24px);
}

/* Icons inside toggle */
.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  transition: opacity 0.3s ease, color 0.3s ease;
  z-index: 1;
}

.theme-toggle .icon-sun {
  color: var(--accent);
  opacity: 1;
}

.theme-toggle .icon-moon {
  color: var(--text-muted);
  opacity: 0.4;
}

[data-theme="dark"] .theme-toggle .icon-sun {
  color: var(--text-muted);
  opacity: 0.4;
}

[data-theme="dark"] .theme-toggle .icon-moon {
  color: var(--accent);
  opacity: 1;
}

/* ============================================
   THEME TRANSITION ANIMATION
   ============================================ */

html.theme-transitioning,
html.theme-transitioning *,
html.theme-transitioning *::before,
html.theme-transitioning *::after {
  transition:
    background-color 0.4s ease,
    background 0.4s ease,
    color 0.3s ease,
    border-color 0.3s ease,
    box-shadow 0.3s ease,
    filter 0.4s ease,
    opacity 0.3s ease !important;
}

/* ============================================
   GLOBAL THEME OVERRIDES
   Applied to elements using the CSS variables
   ============================================ */

/* Body background */
body {
  background: var(--bg-primary);
  color: var(--text-primary);
}

/* Navigation themed */
.nav {
  background: var(--nav-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--nav-border);
}

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

.nav-link:hover,
.nav-link.active {
  color: var(--accent);
}

/* Logo filter */
.logo img {
  filter: var(--logo-filter);
}

/* Mobile menu */
.mobile-menu {
  background: var(--mobile-menu-bg);
}

.mobile-menu .nav-link {
  color: var(--mobile-link-color);
}

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

/* Hamburger lines */
.hamburger span {
  background: var(--text-primary);
}

/* Hero section */
.hero {
  background: var(--bg-primary);
}

.hero-bg {
  filter: brightness(var(--hero-brightness)) saturate(var(--hero-saturation));
}

.hero-gradient {
  background: var(--hero-overlay);
}

.hero-content {
  text-shadow: var(--hero-text-shadow);
}

.text-ghost {
  -webkit-text-stroke: 1px var(--hero-text-stroke);
  color: transparent;
}

.text-reveal {
  color: transparent;
}

.hero-subtitle {
  color: var(--hero-subtitle-color);
}

/* Custom cursor */
.custom-cursor {
  border-color: var(--cursor-border);
}

.custom-cursor-dot {
  background: var(--cursor-dot);
}

/* Scroll indicator */
.scroll-text {
  color: var(--scroll-text-color);
}

.scroll-line {
  background: linear-gradient(to bottom, var(--scroll-line-color), transparent);
}

/* Section styling */
.projects-section,
.filter-section {
  background: var(--bg-primary);
}

.section-label {
  color: var(--text-muted);
}

/* Project cards */
.project-card {
  background: var(--bg-card);
}

.project-card:hover {
  box-shadow: var(--shadow-hover);
}

.project-card-overlay {
  background: var(--card-overlay-bg);
}

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

.project-card-title {
  color: var(--card-title-color);
}

.project-card-meta {
  color: var(--card-meta-color);
}

/* Project row (index page) */
.project-image {
  box-shadow: var(--shadow-lg);
}

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

.project-title {
  color: var(--text-primary);
}

.project-description {
  color: var(--text-muted);
}

.project-link {
  color: var(--text-muted);
}

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

/* Filter tabs */
.filter-tab {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
}

.filter-tab:hover {
  border-color: var(--border-strong);
  color: var(--text-primary);
}

.filter-tab.active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg-primary);
}

/* Page headers */
.page-header {
  background: var(--bg-primary);
}

.page-title {
  color: var(--text-primary);
}

.page-description {
  color: var(--text-muted);
}

/* About page */
.about-intro {
  background: var(--bg-card);
}

.about-label,
.philosophy-label,
.equipment-title {
  color: var(--accent);
}

.about-title,
.about-signature,
.philosophy-quote,
.equipment-subtitle,
.cta-title {
  color: var(--text-primary);
}

.about-text,
.philosophy-text,
.cta-text {
  color: var(--text-muted);
}

/* Stats section */
.stats-section {
  background: var(--border-color);
}

.stat-item {
  background: var(--bg-primary);
}

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

.stat-label {
  color: var(--text-muted);
}

/* Equipment section */
.equipment-section {
  background: var(--bg-card);
}

.equipment-category h3 {
  color: var(--text-primary);
  border-bottom-color: var(--border-color);
}

.equipment-list li {
  color: var(--text-muted);
  border-bottom-color: var(--border-color);
}

/* CTA section */
.cta-section {
  background: linear-gradient(to bottom, var(--bg-card), var(--bg-primary));
}

.cta-button {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
}

.cta-button:hover {
  background: var(--btn-primary-hover);
  box-shadow: 0 10px 30px rgba(139, 115, 85, 0.25);
}

[data-theme="dark"] .cta-button:hover {
  box-shadow: 0 10px 30px rgba(184, 134, 11, 0.3);
}

/* Footer */
.footer {
  background: var(--bg-primary);
  border-top: 1px solid var(--footer-border);
}

.footer-copy {
  color: var(--footer-text);
}

/* Forms (contact page) */
.form-group input,
.form-group textarea,
input[type="text"],
input[type="email"],
textarea {
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  color: var(--input-text);
}

.form-group input::placeholder,
.form-group textarea::placeholder,
input::placeholder,
textarea::placeholder {
  color: var(--input-placeholder);
}

.form-group input:focus,
.form-group textarea:focus,
input:focus,
textarea:focus {
  border-color: var(--input-focus-border);
  box-shadow: 0 0 0 3px var(--accent-light);
}

/* Loading states */
.loading-state {
  color: var(--text-muted);
}

.loading-spinner::after {
  border-color: var(--border-color);
  border-top-color: var(--accent);
}

/* Journal/Blog */
.post-card {
  background: var(--bg-card);
}

.post-title {
  color: var(--text-primary);
}

.post-excerpt,
.post-meta {
  color: var(--text-muted);
}

.post-tag {
  background: var(--accent-light);
  color: var(--accent);
}

/* Responsive filter gradient overlays */
@media (max-width: 768px) {
  .filter-section::before {
    background: linear-gradient(to right, var(--bg-primary) 0%, transparent 100%);
  }
  .filter-section::after {
    background: linear-gradient(to left, var(--bg-primary) 0%, transparent 100%);
  }
}