/* ============================================================
   DESIGN SYSTEM — JUJO CHEMICAL (THAILAND) v2.0
   ============================================================ */

/* Fonts are loaded locally via /lib/fonts/css/fonts.css in _head.ejs */

/* ============================================================
   CSS CUSTOM PROPERTIES
   ============================================================ */
:root {
  /* Brand */
  --c-primary:        #0A1628;
  --c-primary-light:  #1A3A5C;
  --c-secondary:      #1565C0;
  --c-accent:         #00C9E0;
  --c-accent-hover:   #00B4CA;
  --c-gold:           #FFB703;

  /* Backgrounds — logo blue + off-white smoke */
  --c-bg:        #EEF5FC;
  --c-surface:   #F5F9FF;
  --c-surface-2: #E3EEF9;
  --c-surface-3: #D6E6F5;

  /* Borders */
  --c-border:       #C2D9EE;
  --c-border-mid:   #9EC0E0;
  --c-border-dark:  #6EA4CC;

  /* Text */
  --c-text:        #0D2A45;
  --c-text-2:      #1E4A70;
  --c-text-muted:  #4A7A9B;
  --c-text-faint:  #7AAAC8;
  --c-text-inv:    #FFFFFF;

  /* Product categories */
  --c-solvent:       #059669;
  --c-solvent-lt:    #D1FAE5;
  --c-solvent-dk:    #047857;
  --c-uv:            #1D4ED8;
  --c-uv-lt:         #DBEAFE;
  --c-uv-dk:         #1E40AF;
  --c-pad:           #EA580C;
  --c-pad-lt:        #FED7AA;
  --c-pad-dk:        #C2410C;
  --c-additive:      #7C3AED;
  --c-additive-lt:   #EDE9FE;
  --c-additive-dk:   #6D28D9;
  --c-thinner:       #0891B2;
  --c-thinner-lt:    #CFFAFE;
  --c-thinner-dk:    #0E7490;

  /* Gradients */
  --g-brand:   linear-gradient(135deg, #0A1628 0%, #1565C0 100%);
  --g-accent:  linear-gradient(135deg, #00C9E0 0%, #1565C0 100%);
  --g-hero:    linear-gradient(to bottom, rgba(10,22,40,0.2) 0%, rgba(10,22,40,0.85) 100%);
  --g-card:    linear-gradient(135deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0.05) 100%);
  --g-glass:   linear-gradient(135deg, rgba(255,255,255,0.12) 0%, rgba(255,255,255,0.04) 100%);

  /* Typography */
  --f-thai:    'Kanit', sans-serif;
  --f-latin:   'Inter', sans-serif;
  --f-primary: 'Kanit', 'Inter', 'Noto Sans JP', sans-serif;

  --sz-xs:   0.75rem;
  --sz-sm:   0.875rem;
  --sz-base: 1rem;
  --sz-lg:   1.125rem;
  --sz-xl:   1.25rem;
  --sz-2xl:  1.5rem;
  --sz-3xl:  1.875rem;
  --sz-4xl:  2.25rem;
  --sz-5xl:  3rem;
  --sz-6xl:  3.75rem;
  --sz-7xl:  4.5rem;

  --lh-tight:   1.2;
  --lh-snug:    1.375;
  --lh-normal:  1.5;
  --lh-relaxed: 1.625;
  --lh-loose:   2;

  --fw-light:     300;
  --fw-regular:   400;
  --fw-medium:    500;
  --fw-semibold:  600;
  --fw-bold:      700;
  --fw-extrabold: 800;

  /* Spacing */
  --sp-1:  0.25rem;
  --sp-2:  0.5rem;
  --sp-3:  0.75rem;
  --sp-4:  1rem;
  --sp-5:  1.25rem;
  --sp-6:  1.5rem;
  --sp-8:  2rem;
  --sp-10: 2.5rem;
  --sp-12: 3rem;
  --sp-16: 4rem;
  --sp-20: 5rem;
  --sp-24: 6rem;
  --sp-32: 8rem;

  /* Radius */
  --r-sm:   0.25rem;
  --r-md:   0.5rem;
  --r-lg:   0.75rem;
  --r-xl:   1rem;
  --r-2xl:  1.5rem;
  --r-3xl:  2rem;
  --r-full: 9999px;

  /* Shadows */
  --sh-xs: 0 1px 2px rgba(0,0,0,0.05);
  --sh-sm: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px -1px rgba(0,0,0,0.1);
  --sh-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
  --sh-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
  --sh-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
  --sh-2xl: 0 25px 50px -12px rgba(0,0,0,0.25);
  --sh-brand: 0 4px 20px rgba(21,101,192,0.3);
  --sh-accent: 0 4px 20px rgba(0,201,224,0.3);
  --sh-glow: 0 0 40px rgba(0,201,224,0.15);

  /* Transitions */
  --ease-out:    cubic-bezier(0, 0, 0.2, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --dur-fast:   150ms;
  --dur-normal: 250ms;
  --dur-slow:   350ms;
  --dur-slower: 500ms;

  /* Layout */
  --nav-h: 72px;
  --nav-h-scroll: 60px;
  --container: 1280px;
  --container-lg: 1536px;

  /* Z-index */
  --z-drop:   100;
  --z-sticky: 200;
  --z-over:   300;
  --z-modal:  400;
  --z-toast:  500;
}

/* ============================================================
   RESET & BASE
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  font-size: 16px;
}

body {
  font-family: var(--f-primary);
  font-size: var(--sz-base);
  line-height: var(--lh-normal);
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

body.menu-open { overflow: hidden; }

h1,h2,h3,h4,h5,h6 {
  font-family: var(--f-primary);
  font-weight: var(--fw-bold);
  line-height: var(--lh-tight);
  color: var(--c-text);
}

h1 { font-size: clamp(2rem, 5vw, var(--sz-6xl)); }
h2 { font-size: clamp(1.5rem, 3vw, var(--sz-4xl)); }
h3 { font-size: clamp(1.2rem, 2.5vw, var(--sz-3xl)); }
h4 { font-size: var(--sz-2xl); }
h5 { font-size: var(--sz-xl); }
h6 { font-size: var(--sz-lg); }

p { line-height: var(--lh-relaxed); color: var(--c-text-2); }
a { color: var(--c-secondary); text-decoration: none; transition: color var(--dur-fast) var(--ease-out); }
a:hover { color: var(--c-accent); }
img { max-width: 100%; height: auto; display: block; margin-left: auto; margin-right: auto; object-position: center center; }
ul, ol { list-style: none; }
button, input, select, textarea { font-family: inherit; font-size: inherit; }
button { cursor: pointer; border: none; background: none; }
kbd {
  display: inline-block;
  padding: 1px 6px;
  border: 1px solid var(--c-border-mid);
  border-radius: var(--r-sm);
  font-size: var(--sz-xs);
  font-family: monospace;
  color: var(--c-text-muted);
  background: var(--c-surface-2);
}

/* ============================================================
   LAYOUT UTILITIES
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--sp-6);
}
.container-lg { max-width: var(--container-lg); }

.section     { padding: var(--sp-20) 0; }
.section-sm  { padding: var(--sp-12) 0; }
.section-lg  { padding: var(--sp-32) 0; }

/* Grid */
.grid   { display: grid; gap: var(--sp-6); }
.g-2    { grid-template-columns: repeat(2, 1fr); }
.g-3    { grid-template-columns: repeat(3, 1fr); }
.g-4    { grid-template-columns: repeat(4, 1fr); }
.g-5    { grid-template-columns: repeat(5, 1fr); }

/* Flex */
.flex         { display: flex; }
.flex-center  { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-col     { display: flex; flex-direction: column; }
.gap-2        { gap: var(--sp-2); }
.gap-4        { gap: var(--sp-4); }
.gap-6        { gap: var(--sp-6); }
.gap-8        { gap: var(--sp-8); }

/* Section Header */
.sec-header { text-align: center; margin-bottom: var(--sp-16); }

.sec-label {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-3);
  font-size: var(--sz-xs);
  font-weight: var(--fw-semibold);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: var(--sp-4);
}
.sec-label::before,
.sec-label::after {
  content: '';
  width: 24px;
  height: 1px;
  background: currentColor;
  opacity: 0.6;
}

.sec-title {
  font-size: clamp(1.75rem, 3.5vw, var(--sz-5xl));
  font-weight: var(--fw-extrabold);
  color: var(--c-text);
  margin-bottom: var(--sp-4);
  line-height: 1.15;
}
.sec-title em {
  font-style: normal;
  background: var(--g-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.sec-desc {
  font-size: var(--sz-lg);
  color: var(--c-text-muted);
  max-width: 580px;
  margin: 0 auto;
  line-height: var(--lh-relaxed);
}

/* Breadcrumbs */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--sz-sm);
  color: var(--c-text-muted);
  flex-wrap: wrap;
}
.breadcrumb a { color: var(--c-text-muted); transition: color var(--dur-fast); }
.breadcrumb a:hover { color: var(--c-accent); }
.breadcrumb .sep { color: var(--c-border-mid); }
.breadcrumb .current { color: var(--c-text-2); font-weight: var(--fw-medium); }

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-1);
  padding: 3px var(--sp-3);
  border-radius: var(--r-full);
  font-size: var(--sz-xs);
  font-weight: var(--fw-semibold);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.badge-solvent  { background: var(--c-solvent-lt); color: var(--c-solvent-dk); }
.badge-uv       { background: var(--c-uv-lt);      color: var(--c-uv-dk); }
.badge-pad      { background: var(--c-pad-lt);      color: var(--c-pad-dk); }
.badge-additive { background: var(--c-additive-lt); color: var(--c-additive-dk); }
.badge-thinner  { background: var(--c-thinner-lt);  color: var(--c-thinner-dk); }

/* Text */
.text-center  { text-align: center; }
.text-left    { text-align: left; }
.text-muted   { color: var(--c-text-muted); }
.text-inv     { color: var(--c-text-inv); }
.text-gradient {
  background: var(--g-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.text-accent { color: var(--c-accent); }

/* Divider */
.divider { height: 1px; background: var(--c-border); margin: var(--sp-8) 0; }
.divider-v { width: 1px; background: var(--c-border); align-self: stretch; }

/* Overlay */
.overlay { position: absolute; inset: 0; background: var(--g-hero); }

/* Aspect */
.aspect-sq  { aspect-ratio: 1/1; }
.aspect-vid { aspect-ratio: 16/9; }
.aspect-43  { aspect-ratio: 4/3; }

/* Object fit */
.cover { width: 100%; height: 100%; object-fit: cover; }

/* Scrollbar */
::-webkit-scrollbar            { width: 6px; height: 6px; }
::-webkit-scrollbar-track      { background: var(--c-surface-2); }
::-webkit-scrollbar-thumb      { background: var(--c-border-mid); border-radius: var(--r-full); }
::-webkit-scrollbar-thumb:hover{ background: var(--c-text-faint); }

/* Selection */
::selection { background: var(--c-accent); color: var(--c-text-inv); }

/* Focus */
:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 3px; border-radius: var(--r-sm); }

/* ============================================================
   ANIMATIONS
   ============================================================ */
@keyframes fadeIn     { from { opacity: 0; }                      to { opacity: 1; } }
@keyframes fadeInUp   { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeInDown { from { opacity: 0; transform: translateY(-24px); } to { opacity: 1; transform: translateY(0); } }
@keyframes scaleIn    { from { opacity: 0; transform: scale(0.96); }  to { opacity: 1; transform: scale(1); } }
@keyframes float      { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }
@keyframes pulse-ring { 0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(0,201,224,0.4); } 70% { transform: scale(1); box-shadow: 0 0 0 10px rgba(0,201,224,0); } 100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(0,201,224,0); } }
@keyframes scroll-dot { 0%,100% { transform: translateY(0); opacity: 1; } 50% { transform: translateY(6px); opacity: 0.4; } }
@keyframes shimmer    { 0% { background-position: -200% 0; } 100% { background-position: 200% 0; } }
@keyframes gradient-shift { 0%,100% { background-position: 0% 50%; } 50% { background-position: 100% 50%; } }

.anim-fade-up   { animation: fadeInUp 0.6s var(--ease-out) both; }
.anim-scale-in  { animation: scaleIn 0.4s var(--ease-out) both; }
.anim-float     { animation: float 3s ease-in-out infinite; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1280px) { .g-4 { grid-template-columns: repeat(2,1fr); } .g-5 { grid-template-columns: repeat(3,1fr); } }
@media (max-width: 1024px) { :root { --nav-h: 64px; } .g-3 { grid-template-columns: repeat(2,1fr); } }
@media (max-width: 768px) {
  .container { padding: 0 var(--sp-4); }
  .section { padding: var(--sp-16) 0; }
  .section-lg { padding: var(--sp-24) 0; }
  .g-2,.g-3,.g-4,.g-5 { grid-template-columns: 1fr; }
  .sec-header { margin-bottom: var(--sp-10); }
  .sec-desc { font-size: var(--sz-base); }
}
@media (max-width: 480px) {
  :root {
    --sz-5xl: 2.25rem;
    --sz-6xl: 2.75rem;
    --sz-7xl: 3.25rem;
  }
}

/* ---- Back To Top Button ---- */
#back-to-top {
  position: fixed;
  bottom: var(--sp-8);
  right: var(--sp-8);
  z-index: var(--z-sticky);
  width: 48px;
  height: 48px;
  border-radius: var(--r-full);
  background: var(--g-accent);
  color: white;
  font-size: var(--sz-base);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(21,101,192,0.35);
  opacity: 0;
  transform: translateY(16px);
  pointer-events: none;
  transition: opacity var(--dur-normal) var(--ease-out),
              transform var(--dur-normal) var(--ease-out),
              box-shadow var(--dur-normal) var(--ease-out);
  cursor: pointer;
  border: none;
}
#back-to-top.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
#back-to-top:hover {
  box-shadow: 0 8px 30px rgba(21,101,192,0.5);
  transform: translateY(-3px);
}