/* ==========================================================================
   HAMADA AQUA PURE — Core Design System & Global Styles
   Precision Water Purification & Engineering
   Supports: Light Mode, Dark Mode, English (DM Sans) & Arabic (Cairo RTL)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Cairo:wght@300;400;500;600;700;800;900&family=DM+Sans:ital,opsz,wght@0,9..40,300..800;1,9..40,300..800&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* ==========================================================================
   1. Design Tokens & Theme Variables
   ========================================================================== */

:root,
[data-theme="dark"] {
  /* Brand Core - Dark Aquatic Theme (Default) */
  --page-bg: #060D17;
  --page-bg-subtle: #0A1627;
  --page-surface: #0E1E34;
  --card-bg: #122540;
  --card-bg-hover: #172F52;
  --card-border: rgba(255, 255, 255, 0.09);
  --card-border-hover: rgba(0, 210, 180, 0.4);

  /* Aqua Accents & Luminous Glows */
  --aqua: #00D2B4;
  --aqua-light: #4EECD8;
  --aqua-dim: #00B298;
  --aqua-glow: rgba(0, 210, 180, 0.25);
  --aqua-surface: rgba(0, 210, 180, 0.12);
  --cyan-subtle: #0E2A36;

  /* Secondary Cobalt Accents */
  --cobalt: #1677FF;
  --cobalt-glow: rgba(22, 119, 255, 0.25);

  /* Typography Text Colors */
  --text-primary: #FFFFFF;
  --text-secondary: #ADC1D6;
  --text-tertiary: #6E859E;
  --text-inverse: #060D17;

  /* Header & Navigation */
  --nav-bg: rgba(6, 13, 23, 0.85);
  --nav-border: rgba(255, 255, 255, 0.08);
  --nav-link-color: #ADC1D6;
  --nav-link-hover: #FFFFFF;
  --nav-pill-bg: rgba(255, 255, 255, 0.05);

  /* Section Background Alternatives */
  --section-dark-primary: #060D17;
  --section-dark-secondary: #0B182B;
  --section-light-neutral: #0E2038;
  --section-contrast-bg: #0A1526;
  --cta-banner-bg: #0B182B;
  --cta-banner-text: #FFFFFF;
  --cta-banner-subtext: #ADC1D6;

  /* Form & Interactive Elements */
  --input-bg: #0B192E;
  --input-border: rgba(255, 255, 255, 0.14);
  --input-border-focus: var(--aqua);
  --input-text: #FFFFFF;
  --input-placeholder: #5A718B;

  /* Shadows */
  --shadow-subtle: 0 4px 20px -2px rgba(0, 0, 0, 0.3);
  --shadow-medium: 0 12px 36px -4px rgba(0, 0, 0, 0.45);
  --shadow-elevated: 0 24px 60px -12px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 24px var(--aqua-glow);
  --shadow-inner-bevel: inset 0 1px 0 rgba(255, 255, 255, 0.12);

  /* Wave Divider Color */
  --wave-fill: #0B182B;

  /* Hero Ambient Glow */
  --hero-glow: radial-gradient(circle, var(--aqua-glow) 0%, rgba(22, 119, 255, 0.08) 50%, transparent 70%);
}

[data-theme="light"] {
  /* Brand Core - Crisp Clinical Light Theme */
  --page-bg: #F5F8FA;
  --page-bg-subtle: #EDF3F8;
  --page-surface: #FFFFFF;
  --card-bg: #FFFFFF;
  --card-bg-hover: #F0F6FA;
  --card-border: rgba(8, 20, 36, 0.09);
  --card-border-hover: rgba(0, 138, 117, 0.45);

  /* Aqua Accents - High Contrast for Light Mode */
  --aqua: #008A75;
  --aqua-light: #00A88F;
  --aqua-dim: #006B5B;
  --aqua-glow: rgba(0, 138, 117, 0.22);
  --aqua-surface: rgba(0, 138, 117, 0.1);
  --cyan-subtle: #E2F5F2;

  /* Secondary Cobalt Accents */
  --cobalt: #0D66DB;
  --cobalt-glow: rgba(13, 102, 219, 0.18);

  /* Typography Text Colors (High Contrast, WCAG AAA compliant) */
  --text-primary: #081424;
  --text-secondary: #3B4E66;
  --text-tertiary: #647B94;
  --text-inverse: #FFFFFF;

  /* Header & Navigation */
  --nav-bg: rgba(245, 248, 250, 0.92);
  --nav-border: rgba(8, 20, 36, 0.08);
  --nav-link-color: #3B4E66;
  --nav-link-hover: #081424;
  --nav-pill-bg: rgba(8, 20, 36, 0.05);

  /* Section Background Alternatives - All strictly unified for Light Mode */
  --section-dark-primary: #F5F8FA;
  --section-dark-secondary: #EAF1F7;
  --section-light-neutral: #FFFFFF;
  --section-contrast-bg: #E2ECF5;
  --cta-banner-bg: #0A1B2F;
  --cta-banner-text: #FFFFFF;
  --cta-banner-subtext: #ADC1D6;

  /* Form & Interactive Elements */
  --input-bg: #FFFFFF;
  --input-border: rgba(8, 20, 36, 0.18);
  --input-border-focus: var(--aqua);
  --input-text: #081424;
  --input-placeholder: #7A91A8;

  /* Shadows */
  --shadow-subtle: 0 4px 20px -2px rgba(8, 20, 36, 0.06);
  --shadow-medium: 0 12px 36px -4px rgba(8, 20, 36, 0.09);
  --shadow-elevated: 0 24px 60px -12px rgba(8, 20, 36, 0.14);
  --shadow-glow: 0 0 24px var(--aqua-glow);
  --shadow-inner-bevel: inset 0 1px 0 rgba(255, 255, 255, 0.8);

  /* Wave Divider Color */
  --wave-fill: #EAF1F7;

  /* Hero Ambient Glow */
  --hero-glow: radial-gradient(circle, rgba(0, 138, 117, 0.14) 0%, rgba(13, 102, 219, 0.06) 50%, transparent 70%);
}

/* ==========================================================================
   2. Typography & Font Stacks
   ========================================================================== */

:root {
  --font-en: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-ar: 'Cairo', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --font-main: var(--font-en);

  /* Dimensions & Spacing */
  --max-width: 1280px;
  --max-width-wide: 1400px;
  --nav-height: 76px;
  --section-padding: 96px 0;
  --section-padding-sm: 64px 0;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-pill: 9999px;

  /* Transition timings */
  --transition-fast: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 300ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-theme: 350ms cubic-bezier(0.25, 0.1, 0.25, 1);
}

/* Arabic RTL Settings & Cairo Font Override */
html[lang="ar"],
html[dir="rtl"] {
  --font-main: var(--font-ar);
  direction: rtl;
  text-align: right;
  font-family: var(--font-ar);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-size: 16px;
  background-color: var(--page-bg);
  color: var(--text-primary);
  transition: background-color var(--transition-theme), color var(--transition-theme);
  /* Prevent horizontal scroll on all viewports */
  overflow-x: hidden;
  max-width: 100%;
}

body {
  font-family: var(--font-main);
  background-color: var(--page-bg);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  max-width: 100%;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition-theme), color var(--transition-theme);
  /* Safe area support for modern mobile devices (iPhone notch/island) */
  padding-left: env(safe-area-inset-left, 0px);
  padding-right: env(safe-area-inset-right, 0px);
}

main {
  flex: 1 0 auto;
}

/* Accessibility Skip Link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 20px;
  background: var(--aqua);
  color: #060D17;
  padding: 12px 20px;
  font-weight: 700;
  border-radius: var(--radius-sm);
  z-index: 9999;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 20px;
}

/* Media Resets */
img, picture, svg, video {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

ul, ol {
  list-style: none;
}

button, input, textarea, select {
  font: inherit;
  color: inherit;
}

/* ==========================================================================
   3. Typography Hierarchy & Cairo Balancing
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-main);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  text-wrap: balance;
  transition: color var(--transition-theme);
}

/* Cairo specific typographic balance */
html[lang="ar"] h1,
html[lang="ar"] h2,
html[lang="ar"] h3,
html[lang="ar"] h4,
html[lang="ar"] h5,
html[lang="ar"] h6 {
  font-family: var(--font-ar);
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: normal;
  text-wrap: balance;
}

p {
  color: var(--text-secondary);
  font-size: 1.0625rem;
  line-height: 1.68;
  text-wrap: pretty;
  transition: color var(--transition-theme);
}

html[lang="ar"] p {
  font-family: var(--font-ar);
  font-size: 1.0625rem;
  line-height: 1.75;
  letter-spacing: normal;
  text-wrap: pretty;
}

html[lang="ar"] span,
html[lang="ar"] a,
html[lang="ar"] button,
html[lang="ar"] input,
html[lang="ar"] select,
html[lang="ar"] textarea {
  font-family: var(--font-ar);
  letter-spacing: normal;
}

.mono-tech {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

html[lang="ar"] .mono-tech {
  font-family: var(--font-ar);
  font-weight: 600;
  letter-spacing: 0.02em;
}

.text-aqua {
  color: var(--aqua) !important;
}

.text-gradient-aqua {
  background: linear-gradient(135deg, var(--aqua) 0%, var(--aqua-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ==========================================================================
   4. Layout Containers & Grid System
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: clamp(16px, 4vw, 32px);
  padding-right: clamp(16px, 4vw, 32px);
}

.container-wide {
  width: 100%;
  max-width: var(--max-width-wide);
  margin-left: auto;
  margin-right: auto;
  padding-left: clamp(16px, 4vw, 32px);
  padding-right: clamp(16px, 4vw, 32px);
}

.section {
  padding: clamp(56px, 8vw, 96px) 0;
  position: relative;
  transition: background-color var(--transition-theme);
}

.section-sm {
  padding: clamp(40px, 5vw, 64px) 0;
  position: relative;
  transition: background-color var(--transition-theme);
}

/* Section Colors */
.section-dark {
  background-color: var(--section-dark-primary);
}

.section-dark-mid {
  background-color: var(--section-dark-secondary);
}

.section-light {
  background-color: var(--section-light-neutral);
}

.section-contrast {
  background-color: var(--section-contrast-bg);
}

/* Grid Layouts */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(20px, 3vw, 36px);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(16px, 2.5vw, 32px);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(14px, 2vw, 24px);
}

@media (max-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}

/* Touch Device Target Enhancements (Coarse Pointer) */
@media (pointer: coarse) {
  button, 
  .btn, 
  .nav-link, 
  .theme-toggle-btn, 
  .lang-switcher-btn, 
  .mobile-toggle-btn, 
  .btn-copy-action {
    min-height: 44px;
  }
}

/* Section Header Component */
.section-header {
  margin-bottom: clamp(32px, 5vw, 48px);
  max-width: 720px;
}

.section-header.center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
  color: var(--text-primary);
  margin-bottom: 14px;
}

.section-subtitle {
  font-size: clamp(0.9375rem, 1.8vw, 1.125rem);
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Eyebrow Pill Badge (Restrained Use) */
.eyebrow-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  background: var(--aqua-surface);
  border: 1px solid var(--aqua-glow);
  color: var(--aqua);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 16px;
  transition: all var(--transition-theme);
}

html[lang="ar"] .eyebrow-badge {
  letter-spacing: normal;
  font-weight: 700;
}

/* Wave Divider between sections */
.wave-divider {
  width: 100%;
  overflow: hidden;
  line-height: 0;
  background: transparent;
}

.wave-divider svg {
  display: block;
  width: 100%;
  height: 40px;
}

.wave-divider path {
  fill: var(--wave-fill);
  transition: fill var(--transition-theme);
}