/* ============================================================================
   TECH STORE INTERNATIONAL — DESIGN SYSTEM
   Phase 2: Visual Identity · Color System · Typography · Layout Tokens
   Built with CSS logical properties to support both RTL (Arabic) and LTR (English)
   ============================================================================ */

/* ---------------------------------------------------------------------------
   1. DESIGN TOKENS — COLORS
   --------------------------------------------------------------------------- */
:root {
  /* Brand — Navy scale */
  --tsi-navy-950: #06090F;
  --tsi-navy-900: #0B0F19; /* Dark Background */
  --tsi-navy-800: #101B35; /* Deep Navy (primary) */
  --tsi-navy-700: #172642; /* Secondary Navy */
  --tsi-navy-600: #1F3155;
  --tsi-navy-500: #2A3F68;

  /* Brand — Gold accent */
  --tsi-gold: #D4AF37;        /* Premium Gold */
  --tsi-gold-light: #E8CA75;  /* Light Gold */
  --tsi-gold-dark: #A8842A;
  --tsi-gold-soft: rgba(212, 175, 55, 0.12);
  --tsi-gold-line: rgba(212, 175, 55, 0.28);

  /* Neutrals */
  --tsi-white: #FFFFFF;
  --tsi-gray-50: #F5F6F8;     /* Light Gray */
  --tsi-gray-200: #E2E5EA;
  --tsi-text-secondary: #AAB3C2;

  /* Semantic */
  --tsi-success: #2E9E6B;
  --tsi-warning: #D99A2B;
  --tsi-danger: #C4453D;
  --tsi-info: #3B7DBF;

  /* Surfaces */
  --tsi-bg: var(--tsi-navy-900);
  --tsi-bg-alt: var(--tsi-navy-800);
  --tsi-surface: var(--tsi-navy-700);
  --tsi-surface-raised: #1C2E4F;
  --tsi-border: rgba(255, 255, 255, 0.08);
  --tsi-border-gold: var(--tsi-gold-line);

  /* Text */
  --tsi-text: var(--tsi-white);
  --tsi-text-muted: var(--tsi-text-secondary);
  --tsi-text-invert: var(--tsi-navy-900);

  /* ---------------------------------------------------------------------------
     2. DESIGN TOKENS — TYPOGRAPHY
     --------------------------------------------------------------------------- */
  --tsi-font-en: "Inter", "Montserrat", system-ui, -apple-system, "Segoe UI", sans-serif;
  --tsi-font-ar: "Tajawal", "Cairo", "Segoe UI", Tahoma, sans-serif;
  --tsi-font-display-en: "Montserrat", "Inter", system-ui, sans-serif;
  --tsi-font-display-ar: "Cairo", "Tajawal", "Segoe UI", sans-serif;

  /* Fluid type scale (clamp = min, preferred, max) */
  --tsi-fs-display: clamp(2.5rem, 1.6rem + 4vw, 4.75rem);
  --tsi-fs-h1: clamp(2rem, 1.35rem + 2.6vw, 3.25rem);
  --tsi-fs-h2: clamp(1.6rem, 1.15rem + 1.8vw, 2.5rem);
  --tsi-fs-h3: clamp(1.3rem, 1.05rem + 0.9vw, 1.75rem);
  --tsi-fs-h4: clamp(1.1rem, 1rem + 0.4vw, 1.35rem);
  --tsi-fs-body-lg: 1.125rem;
  --tsi-fs-body: 1rem;
  --tsi-fs-sm: 0.875rem;
  --tsi-fs-xs: 0.75rem;

  --tsi-lh-tight: 1.15;
  --tsi-lh-snug: 1.35;
  --tsi-lh-base: 1.7;
  --tsi-lh-relaxed: 1.85;

  --tsi-weights: 400;
  --tsi-fw-regular: 400;
  --tsi-fw-medium: 500;
  --tsi-fw-semibold: 600;
  --tsi-fw-bold: 700;

  --tsi-tracking-wide: 0.08em;
  --tsi-tracking-wider: 0.18em;

  /* ---------------------------------------------------------------------------
     3. DESIGN TOKENS — SPACING · RADIUS · SHADOW · MOTION
     --------------------------------------------------------------------------- */
  --tsi-space-1: 0.25rem;
  --tsi-space-2: 0.5rem;
  --tsi-space-3: 0.75rem;
  --tsi-space-4: 1rem;
  --tsi-space-5: 1.5rem;
  --tsi-space-6: 2rem;
  --tsi-space-7: 3rem;
  --tsi-space-8: 4rem;
  --tsi-space-9: 6rem;
  --tsi-space-10: 8rem;

  --tsi-container: 1280px;
  --tsi-container-narrow: 960px;
  --tsi-gutter: clamp(1rem, 4vw, 2.5rem);

  --tsi-radius-sm: 4px;
  --tsi-radius: 8px;
  --tsi-radius-lg: 16px;
  --tsi-radius-pill: 999px;

  --tsi-shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
  --tsi-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  --tsi-shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.45);
  --tsi-shadow-gold: 0 12px 36px rgba(212, 175, 55, 0.18);

  --tsi-ease: cubic-bezier(0.22, 1, 0.36, 1);
  --tsi-transition: 260ms var(--tsi-ease);
  --tsi-transition-slow: 520ms var(--tsi-ease);

  --tsi-header-h: 84px;
  --tsi-z-header: 1000;
  --tsi-z-overlay: 1100;
  --tsi-z-modal: 1200;

  /* Font family resolves per document direction */
  --tsi-font-body: var(--tsi-font-en);
  --tsi-font-display: var(--tsi-font-display-en);
}

/* ---------------------------------------------------------------------------
   4. GLOBAL RESET / BASE
   --------------------------------------------------------------------------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background-color: var(--tsi-bg);
  color: var(--tsi-text);
  font-family: var(--tsi-font-body);
  font-size: var(--tsi-fs-body);
  line-height: var(--tsi-lh-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img, picture, video, svg { max-width: 100%; height: auto; display: block; }
a { color: var(--tsi-gold); text-decoration: none; transition: color var(--tsi-transition); }
a:hover { color: var(--tsi-gold-light); }
ul, ol { margin: 0; padding: 0; list-style: none; }
button { font-family: inherit; cursor: pointer; }
:focus-visible { outline: 2px solid var(--tsi-gold); outline-offset: 3px; }

/* ---------------------------------------------------------------------------
   5. LANGUAGE / DIRECTION HANDLING (RTL · LTR)
   --------------------------------------------------------------------------- */
html[dir="rtl"] {
  --tsi-font-body: var(--tsi-font-ar);
  --tsi-font-display: var(--tsi-font-display-ar);
}
html[dir="ltr"] {
  --tsi-font-body: var(--tsi-font-en);
  --tsi-font-display: var(--tsi-font-display-en);
}

/* Arabic needs slightly more line-height & no negative tracking */
html[dir="rtl"] body { line-height: var(--tsi-lh-relaxed); }

/* ---------------------------------------------------------------------------
   6. TYPOGRAPHY
   --------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--tsi-font-display);
  margin: 0 0 var(--tsi-space-4);
  line-height: var(--tsi-lh-tight);
  font-weight: var(--tsi-fw-bold);
  color: var(--tsi-white);
}

h1 { font-size: var(--tsi-fs-h1); }
h2 { font-size: var(--tsi-fs-h2); }
h3 { font-size: var(--tsi-fs-h3); }
h4 { font-size: var(--tsi-fs-h4); }

p { margin: 0 0 var(--tsi-space-4); color: var(--tsi-text-muted); }

.tsi-display { font-size: var(--tsi-fs-display); font-family: var(--tsi-font-display); line-height: var(--tsi-lh-tight); }
.tsi-lead { font-size: var(--tsi-fs-body-lg); color: var(--tsi-text-muted); max-width: 62ch; }

/* Gold gradient headings */
.tsi-text-gold {
  color: var(--tsi-gold);
  background: linear-gradient(100deg, var(--tsi-gold-light), var(--tsi-gold) 55%, var(--tsi-gold-dark));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.tsi-text-muted { color: var(--tsi-text-muted); }

/* Small uppercase eyebrow label */
.tsi-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--tsi-space-2);
  font-family: var(--tsi-font-body);
  font-size: var(--tsi-fs-xs);
  font-weight: var(--tsi-fw-semibold);
  letter-spacing: var(--tsi-tracking-wider);
  text-transform: uppercase;
  color: var(--tsi-gold);
}
.tsi-eyebrow::before {
  content: "";
  inline-size: 32px;
  block-size: 1px;
  background: var(--tsi-gold);
}
html[dir="rtl"] .tsi-eyebrow { text-transform: none; letter-spacing: var(--tsi-tracking-wide); }

/* ---------------------------------------------------------------------------
   7. LAYOUT PRIMITIVES (logical, direction-agnostic)
   --------------------------------------------------------------------------- */
.tsi-container {
  width: 100%;
  max-width: var(--tsi-container);
  margin-inline: auto;
  padding-inline: var(--tsi-gutter);
}
.tsi-container--narrow { max-width: var(--tsi-container-narrow); }

.tsi-section { padding-block: clamp(3.5rem, 8vw, var(--tsi-space-10)); position: relative; }
.tsi-section--alt { background-color: var(--tsi-bg-alt); }
.tsi-section--tight { padding-block: clamp(2.5rem, 5vw, var(--tsi-space-8)); }

.tsi-grid { display: grid; gap: var(--tsi-space-6); }
.tsi-grid--2 { grid-template-columns: repeat(2, 1fr); }
.tsi-grid--3 { grid-template-columns: repeat(3, 1fr); }
.tsi-grid--4 { grid-template-columns: repeat(4, 1fr); }

.tsi-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, var(--tsi-space-9));
  align-items: center;
}
.tsi-split--reverse > :first-child { order: 2; }

.tsi-cluster { display: flex; flex-wrap: wrap; gap: var(--tsi-space-4); align-items: center; }
.tsi-stack > * + * { margin-block-start: var(--tsi-space-4); }

/* ---------------------------------------------------------------------------
   8. BUTTONS
   --------------------------------------------------------------------------- */
.tsi-btn {
  --_bg: var(--tsi-gold);
  --_fg: var(--tsi-navy-900);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--tsi-space-2);
  padding: 0.85rem 1.75rem;
  border: 1px solid transparent;
  border-radius: var(--tsi-radius-pill);
  background: var(--_bg);
  color: var(--_fg);
  font-family: var(--tsi-font-body);
  font-size: var(--tsi-fs-sm);
  font-weight: var(--tsi-fw-semibold);
  letter-spacing: var(--tsi-tracking-wide);
  text-transform: uppercase;
  line-height: 1;
  transition: transform var(--tsi-transition), box-shadow var(--tsi-transition),
              background-color var(--tsi-transition), color var(--tsi-transition);
  will-change: transform;
}
.tsi-btn:hover { color: var(--_fg); transform: translateY(-2px); box-shadow: var(--tsi-shadow-gold); }
.tsi-btn:active { transform: translateY(0); }

.tsi-btn--outline {
  --_bg: transparent;
  --_fg: var(--tsi-white);
  border-color: var(--tsi-gold-line);
}
.tsi-btn--outline:hover { --_bg: var(--tsi-gold-soft); border-color: var(--tsi-gold); color: var(--tsi-white); }

.tsi-btn--ghost { --_bg: transparent; --_fg: var(--tsi-gold); border-color: transparent; padding-inline: 0.5rem; }
.tsi-btn--ghost:hover { --_bg: transparent; color: var(--tsi-gold-light); box-shadow: none; }

.tsi-btn--lg { padding: 1.05rem 2.25rem; font-size: var(--tsi-fs-body); }
.tsi-btn--block { width: 100%; }

html[dir="rtl"] .tsi-btn { letter-spacing: 0; text-transform: none; }

/* ---------------------------------------------------------------------------
   9. CARDS · DIVIDERS · DECORATION
   --------------------------------------------------------------------------- */
.tsi-card {
  background: var(--tsi-surface);
  border: 1px solid var(--tsi-border);
  border-radius: var(--tsi-radius-lg);
  padding: var(--tsi-space-6);
  transition: transform var(--tsi-transition), border-color var(--tsi-transition), box-shadow var(--tsi-transition);
}
.tsi-card:hover { transform: translateY(-4px); border-color: var(--tsi-border-gold); box-shadow: var(--tsi-shadow); }

.tsi-hairline { block-size: 1px; background: var(--tsi-border-gold); border: 0; margin-block: var(--tsi-space-6); }

.tsi-rule-gold {
  inline-size: 72px;
  block-size: 3px;
  background: linear-gradient(90deg, var(--tsi-gold), transparent);
  border-radius: var(--tsi-radius-pill);
  margin-block: var(--tsi-space-4) var(--tsi-space-5);
}
html[dir="rtl"] .tsi-rule-gold { background: linear-gradient(270deg, var(--tsi-gold), transparent); }

/* Overlay for hero / media sections */
.tsi-overlay::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11, 15, 25, 0.55) 0%, rgba(11, 15, 25, 0.85) 70%, var(--tsi-navy-900) 100%);
  z-index: 0;
}

/* ---------------------------------------------------------------------------
   10. UTILITIES
   --------------------------------------------------------------------------- */
.tsi-text-start { text-align: start; }
.tsi-text-end { text-align: end; }
.tsi-text-center { text-align: center; }
.tsi-ms-auto { margin-inline-start: auto; }
.tsi-me-auto { margin-inline-end: auto; }
.tsi-mt-0 { margin-block-start: 0; }
.tsi-mb-0 { margin-block-end: 0; }
.tsi-mb-2 { margin-block-end: var(--tsi-space-2); }
.tsi-mb-4 { margin-block-end: var(--tsi-space-4); }
.tsi-mb-6 { margin-block-end: var(--tsi-space-6); }
.tsi-py-0 { padding-block: 0; }
.tsi-hidden { display: none !important; }
.tsi-sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}
.tsi-ratio { position: relative; overflow: hidden; border-radius: var(--tsi-radius-lg); }
.tsi-ratio img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--tsi-transition-slow); }
.tsi-ratio:hover img { transform: scale(1.06); }
.tsi-ratio--16x9 { aspect-ratio: 16 / 9; }
.tsi-ratio--4x3 { aspect-ratio: 4 / 3; }
.tsi-ratio--1x1 { aspect-ratio: 1 / 1; }

/* ---------------------------------------------------------------------------
   11. ANIMATION HOOKS — scroll reveal (local, no external library)
   --------------------------------------------------------------------------- */
[data-tsi-reveal] { opacity: 0; transform: translateY(28px); transition: opacity 700ms var(--tsi-ease), transform 700ms var(--tsi-ease); }
[data-tsi-reveal].is-visible { opacity: 1; transform: none; }

/* [data-aos] motion hooks — hidden until revealed by app.js (only when JS is on). */
html.tsi-js [data-aos] {
  opacity: 0;
  transform: translate3d(0, 26px, 0);
  transition: opacity 700ms var(--tsi-ease), transform 700ms var(--tsi-ease);
  will-change: opacity, transform;
}
html.tsi-js [data-aos].is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
  [data-tsi-reveal],
  html.tsi-js [data-aos] { opacity: 1; transform: none; }
}

/* ---------------------------------------------------------------------------
   12. RESPONSIVE BREAKPOINTS
   --------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .tsi-grid--4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  :root { --tsi-header-h: 68px; }
  .tsi-grid--3, .tsi-grid--2, .tsi-split { grid-template-columns: 1fr; }
  .tsi-split--reverse > :first-child { order: 0; }
  .tsi-section { padding-block: clamp(2.5rem, 9vw, 4rem); }
}
@media (max-width: 480px) {
  .tsi-grid--4 { grid-template-columns: 1fr; }
  .tsi-btn { width: 100%; }
}