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

:root {
  --navy:      #0D1B2A;
  --ink-blue:  #1D6FA4;
  --ink-mid:   #2A8DC4;
  --amber:     #F0A500;
  --amber-lt:  #FDD06B;
  --white:     #FFFFFF;
  --off-white: #F5F7FA;
  --gray-100:  #EEF1F5;
  --gray-300:  #C8D0DC;
  --gray-500:  #7A8A9A;
  --gray-700:  #3A4A5A;
  --text:      #1A2633;

  --font-display: 'Playfair Display', Georgia, serif;
  --font-body:    'IBM Plex Sans', system-ui, sans-serif;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  --shadow-sm: 0 2px 8px rgba(13,27,42,0.08);
  --shadow-md: 0 6px 24px rgba(13,27,42,0.12);
  --shadow-lg: 0 16px 48px rgba(13,27,42,0.18);

  --max-w: 1160px;
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-body);
  color: var(--text);
  background: var(--white);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

a { color: inherit; text-decoration: none; }
a:hover { text-decoration: none; }

ul { list-style: none; }

/* ===== HEADER ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--navy);
  box-shadow: 0 2px 12px rgba(0,0,0,0.25);
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.logo-drop {
  width: 28px;
  height: 28px;
  background: var(--amber);
  border-radius: 50% 50% 50% 0;
  transform: rotate(-45deg);
  flex-shrink: 0;
}

.logo-text {
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--white);
  letter-spacing: -0.01em;
}
.logo-text strong { color: var(--amber); font-weight: 700; }
.logo-text em { color: var(--gray-300); font-style: normal; font-size: 0.85em; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-links li a {
  color: var(--gray-300);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: color 0.2s, background 0.2s;
}

.nav-links li a:hover { color: var(--white); background: rgba(255,255,255,0.08); }

.nav-links li a.nav-cta {
  background: var(--amber);
  color: var(--navy);
  font-weight: 600;
}
.nav-links li a.nav-cta:hover { background: var(--amber-lt); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: transform 0.3s;
}

/* ===== HERO ===== */
.hero {
  position: relative;
  background: var(--navy);
  min-height: 88vh;
  display: flex;
  align-items: center;
  padding: 80px 24px;
  overflow: hidden;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 640px;
  margin: 0 auto 0 calc((100vw - var(--max-w)) / 2 + 24px);
}

.hero-eyebrow {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 20px;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 900;
  color: var(--white);
  line-height: 1.12;
  margin-bottom: 24px;
}
.hero h1 em {
  font-style: italic;
  color: var(--amber);
}

.hero-sub {
  font-size: 1.05rem;
  color: var(--gray-300);
  line-height: 1.7;
  margin-bottom: 36px;
  max-width: 520px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn-primary {
  background: var(--amber);
  color: var(--navy);
  font-weight: 700;
  font-size: 0.95rem;
  padding: 14px 28px;
  border-radius: var(--radius-md);
  transition: background 0.2s, transform 0.15s;
  display: inline-block;
}
.btn-primary:hover { background: var(--amber-lt); transform: translateY(-1px); }

.btn-secondary {
  background: rgba(255,255,255,0.08);
  color: var(--white);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 14px 28px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255,255,255,0.15);
  transition: background 0.2s;
  display: inline-block;
}
.btn-secondary:hover { background: rgba(255,255,255,0.14); }

/* Ink drops background */
.ink-drops {
  position: absolute;
  inset: 0;
  z-index: 1;
  overflow: hidden;
}

.drop {
  position: absolute;
  border-radius: 50% 50% 50% 0;
  transform: rotate(-45deg);
  opacity: 0.07;
  animation: floatDrop 8s ease-in-out infinite;
}
.drop-1 { width: 280px; height: 280px; background: var(--ink-blue); top: -80px; right: 10%; animation-delay: 0s; }
.drop-2 { width: 160px; height: 160px; background: var(--amber); top: 30%; right: 5%; animation-delay: 2s; opacity: 0.1; }
.drop-3 { width: 200px; height: 200px; background: var(--ink-mid); bottom: -60px; right: 20%; animation-delay: 4s; }
.drop-4 { width: 100px; height: 100px; background: var(--amber); bottom: 20%; right: 35%; animation-delay: 6s; opacity: 0.06; }

@keyframes floatDrop {
  0%, 100% { transform: rotate(-45deg) translateY(0); }
  50% { transform: rotate(-45deg) translateY(-20px); }
}

/* Ink jar visual */
.hero-visual {
  position: absolute;
  right: max(24px, calc((100vw - var(--max-w)) / 2 + 24px));
  top: 50%;
  transform: translateY(-50%);
  z-index: 2;
  opacity: 0.15;
}

.ink-jar { position: relative; width: 100px; height: 140px; }
.jar-body {
  width: 100%;
  height: 120px;
  border: 4px solid var(--white);
  border-radius: 8px 8px 12px 12px;
  overflow: hidden;
  position: relative;
}
.ink-fill {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 65%;
  background: linear-gradient(to top, var(--ink-blue), var(--ink-mid));
  animation: inkWave 3s ease-in-out infinite;
}
@keyframes inkWave {
  0%, 100% { height: 65%; }
  50% { height: 70%; }
}
.jar-drip {
  position: absolute;
  bottom: -16px;
  left: 50%;
  transform: translateX(-50%);
  width: 8px;
  height: 16px;
  background: var(--ink-mid);
  border-radius: 0 0 50% 50%;
  animation: drip 2.5s ease-in-out infinite;
}
@keyframes drip {
  0%, 70% { height: 4px; opacity: 0; }
  40% { height: 16px; opacity: 1; }
  100% { height: 4px; opacity: 0; }
}

/* ===== STATS BAR ===== */
.stats-bar {
  background: var(--ink-blue);
  padding: 20px 24px;
}
.stats-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  justify-content: center;
  gap: 60px;
  flex-wrap: wrap;
}
.stat {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.stat strong {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 900;
  color: var(--amber);
  line-height: 1;
}
.stat span {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.75);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ===== SECTION TITLES ===== */
.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.5vw, 2.4rem);
  font-weight: 700;
  color: var(--navy);
  line-height: 1.2;
  margin-bottom: 12px;
}
.section-sub {
  font-size: 1rem;
  color: var(--gray-500);
  max-width: 580px;
  line-height: 1.65;
  margin-bottom: 44px;
}

/* ===== GUIDE SECTION ===== */
.guide-section {
  padding: 96px 0;
  background: var(--off-white);
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.guide-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-100);
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: box-shadow 0.25s, transform 0.25s;
  text-decoration: none;
}
.guide-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--ink-blue);
  position: relative;
  flex-shrink: 0;
}
.card-icon::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: 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='white' stroke-width='2'%3E%3Ccircle cx='12' cy='12' r='10'/%3E%3C/svg%3E") center/24px no-repeat;
}
.icon-oem { background: #1D6FA4; }
.icon-refill { background: #0D9E6E; }
.icon-color { background: #8B1DC8; }
.icon-quality { background: #D44000; }
.icon-maint { background: #1D6FA4; }
.icon-paper { background: #0D9E6E; }

.guide-card h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--navy);
  line-height: 1.3;
}
.guide-card p {
  font-size: 0.9rem;
  color: var(--gray-500);
  line-height: 1.6;
  flex: 1;
}
.card-link {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--ink-blue);
  margin-top: auto;
}

/* ===== BRANDS SECTION ===== */
.brands-section {
  padding: 96px 0;
  background: var(--white);
}

.brand-list {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.brand-card {
  border: 1px solid var(--gray-100);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.brand-header {
  padding: 20px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand-header h3 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--white);
}
.brand-tag {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.75);
  background: rgba(255,255,255,0.15);
  padding: 4px 12px;
  border-radius: 999px;
  white-space: nowrap;
}

.brand-header.epson { background: linear-gradient(135deg, #003087 0%, #1D6FA4 100%); }
.brand-header.hp { background: linear-gradient(135deg, #0096D6 0%, #0066CC 100%); }
.brand-header.canon { background: linear-gradient(135deg, #CC0000 0%, #990000 100%); }
.brand-header.brother { background: linear-gradient(135deg, #0072CE 0%, #004A9E 100%); }
.brand-header.lexmark { background: linear-gradient(135deg, #E2231A 0%, #A01010 100%); }
.brand-header.samsung { background: linear-gradient(135deg, #1428A0 0%, #0A1A60 100%); }

.brand-body {
  padding: 28px;
  background: var(--off-white);
}
.brand-body > p { font-size: 0.95rem; color: var(--gray-700); line-height: 1.7; margin-bottom: 16px; }
.brand-body h4 {
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--navy);
  margin: 20px 0 10px;
}
.brand-body ul { padding-left: 0; }
.brand-body ul li {
  font-size: 0.9rem;
  color: var(--gray-700);
  padding: 6px 0 6px 20px;
  border-bottom: 1px solid var(--gray-100);
  position: relative;
}
.brand-body ul li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--ink-blue);
  font-weight: 700;
}
.brand-body ul li strong { color: var(--navy); }

.brand-shop-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 20px;
  background: var(--navy);
  color: var(--white);
  font-size: 0.875rem;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  transition: background 0.2s;
}
.brand-shop-link:hover { background: var(--ink-blue); }

/* ===== TYPES SECTION ===== */
.types-section {
  padding: 96px 0;
  background: var(--off-white);
}

.types-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.type-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  border: 2px solid transparent;
  box-shadow: var(--shadow-sm);
  position: relative;
}
.type-card.type-muadil { border-color: var(--amber); }

.type-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: 999px;
  margin-bottom: 14px;
  background: var(--navy);
  color: var(--white);
}
.type-badge.popular { background: var(--amber); color: var(--navy); }
.type-badge.eco { background: #0D9E6E; color: var(--white); }

.type-card h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--navy);
}
.type-card > p {
  font-size: 0.9rem;
  color: var(--gray-700);
  line-height: 1.6;
  margin-bottom: 20px;
}
.type-pros, .type-cons { margin-bottom: 8px; }
.type-pros li, .type-cons li {
  font-size: 0.85rem;
  padding: 3px 0;
  color: var(--gray-700);
}
.type-pros li { color: #0D6E4A; }
.type-cons li { color: #A03020; }

.types-cta { text-align: center; }
.types-cta p { font-size: 1rem; color: var(--gray-700); margin-bottom: 16px; }
.types-links { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.types-link-btn {
  background: var(--navy);
  color: var(--white);
  font-size: 0.875rem;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  transition: background 0.2s;
}
.types-link-btn:hover { background: var(--ink-blue); }

/* ===== CHEMISTRY SECTION ===== */
.chemistry-section {
  padding: 96px 0;
  background: var(--navy);
}

.chemistry-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 60px;
  align-items: center;
}

.chemistry-text h2 {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  font-weight: 700;
  color: var(--white);
  line-height: 1.2;
  margin-bottom: 20px;
}
.chemistry-text h2 span { color: var(--amber); }
.chemistry-text > p { font-size: 0.95rem; color: var(--gray-300); line-height: 1.7; margin-bottom: 28px; }

.chem-compare { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-bottom: 20px; }
.chem-col {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-md);
  padding: 20px;
}
.chem-col h4 {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--amber);
  margin-bottom: 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.chem-col p { font-size: 0.875rem; color: var(--gray-300); line-height: 1.65; margin-bottom: 10px; }
.chem-use { font-size: 0.85rem !important; color: rgba(255,255,255,0.6) !important; }
.chem-note { font-size: 0.85rem; color: rgba(255,255,255,0.5); font-style: italic; }

.chemistry-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}
.molecule-anim {
  position: relative;
  width: 220px;
  height: 220px;
}
.mol {
  position: absolute;
  border-radius: 50%;
  animation: molPulse 4s ease-in-out infinite;
}
.dye-mol {
  width: 140px; height: 140px;
  background: radial-gradient(circle, rgba(29,111,164,0.6) 0%, rgba(29,111,164,0.1) 70%);
  top: 10px; left: 10px;
}
.pig-mol {
  width: 100px; height: 100px;
  background: radial-gradient(circle, rgba(240,165,0,0.7) 0%, rgba(240,165,0,0.1) 70%);
  bottom: 10px; right: 10px;
  animation-delay: 2s;
}
@keyframes molPulse {
  0%, 100% { transform: scale(1); opacity: 0.8; }
  50% { transform: scale(1.08); opacity: 1; }
}

/* ===== COST SECTION ===== */
.cost-section {
  padding: 96px 0;
  background: var(--white);
}

.cost-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.cost-item {
  background: var(--off-white);
  border-radius: var(--radius-md);
  padding: 28px;
  border-left: 4px solid var(--ink-blue);
}
.cost-item h4 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 12px;
}
.cost-item p { font-size: 0.9rem; color: var(--gray-700); line-height: 1.65; }
.cost-formula {
  background: var(--navy);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  margin-top: 14px;
}
.cost-formula code {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.8rem;
  color: var(--amber);
}

/* ===== FAQ SECTION ===== */
.faq-section {
  padding: 96px 0;
  background: var(--off-white);
}

.faq-list { display: flex; flex-direction: column; gap: 12px; max-width: 840px; }

.faq-item {
  background: var(--white);
  border-radius: var(--radius-md);
  border: 1px solid var(--gray-100);
  overflow: hidden;
}

.faq-item summary {
  padding: 20px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--navy);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  transition: background 0.2s;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '+';
  font-size: 1.4rem;
  font-weight: 300;
  color: var(--ink-blue);
  flex-shrink: 0;
  transition: transform 0.3s;
}
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item summary:hover { background: var(--off-white); }

.faq-item p {
  padding: 0 24px 20px;
  font-size: 0.9rem;
  color: var(--gray-700);
  line-height: 1.7;
}

/* ===== AI SECTION ===== */
.ai-section {
  padding: 96px 0;
  background: var(--navy);
}

.ai-header { text-align: center; margin-bottom: 44px; }
.ai-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(240,165,0,0.15);
  border: 1px solid rgba(240,165,0,0.3);
  color: var(--amber);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 6px 16px;
  border-radius: 999px;
  margin-bottom: 20px;
}
.ai-dot {
  width: 8px; height: 8px;
  background: var(--amber);
  border-radius: 50%;
  animation: pulse 1.5s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}
.ai-header h2 {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  font-weight: 700;
  color: var(--white);
  margin-bottom: 12px;
}
.ai-header p { font-size: 1rem; color: var(--gray-300); max-width: 500px; margin: 0 auto; }

.ai-chat-wrapper {
  max-width: 720px;
  margin: 0 auto;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.ai-chat-messages {
  height: 400px;
  overflow-y: auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  scroll-behavior: smooth;
}
.ai-chat-messages::-webkit-scrollbar { width: 4px; }
.ai-chat-messages::-webkit-scrollbar-track { background: transparent; }
.ai-chat-messages::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.2); border-radius: 2px; }

.chat-msg {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}
.chat-msg.user { flex-direction: row-reverse; }

.msg-avatar {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--ink-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--white);
  flex-shrink: 0;
}
.chat-msg.user .msg-avatar { background: var(--amber); color: var(--navy); }

.msg-bubble {
  max-width: 80%;
  background: rgba(255,255,255,0.08);
  border-radius: 12px 12px 12px 4px;
  padding: 14px 18px;
}
.chat-msg.user .msg-bubble {
  background: var(--ink-blue);
  border-radius: 12px 12px 4px 12px;
}
.msg-bubble p { font-size: 0.9rem; color: var(--white); line-height: 1.6; margin-bottom: 8px; }
.msg-bubble p:last-child { margin-bottom: 0; }
.msg-bubble ul { padding-left: 16px; }
.msg-bubble ul li { font-size: 0.875rem; color: rgba(255,255,255,0.8); line-height: 1.5; margin-bottom: 4px; list-style: disc; }
.msg-bubble a { color: var(--amber); text-decoration: underline; }
.msg-bubble a:hover { color: var(--amber-lt); }

.typing-indicator { display: flex; gap: 5px; align-items: center; padding: 4px 0; }
.typing-dot {
  width: 7px; height: 7px;
  background: rgba(255,255,255,0.5);
  border-radius: 50%;
  animation: typingBounce 1.2s ease-in-out infinite;
}
.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }
@keyframes typingBounce {
  0%, 60%, 100% { transform: translateY(0); }
  30% { transform: translateY(-6px); }
}

.ai-input-area {
  display: flex;
  gap: 0;
  border-top: 1px solid rgba(255,255,255,0.1);
  background: rgba(255,255,255,0.04);
}
.ai-input-area textarea {
  flex: 1;
  background: transparent;
  border: none;
  padding: 16px 20px;
  color: var(--white);
  font-family: var(--font-body);
  font-size: 0.9rem;
  resize: none;
  outline: none;
  line-height: 1.5;
}
.ai-input-area textarea::placeholder { color: rgba(255,255,255,0.35); }
.send-btn {
  width: 56px;
  background: var(--ink-blue);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
  flex-shrink: 0;
}
.send-btn:hover { background: var(--ink-mid); }
.send-btn:disabled { opacity: 0.5; cursor: not-allowed; }
.send-btn svg { width: 20px; height: 20px; color: var(--white); }

.ai-disclaimer {
  text-align: center;
  font-size: 0.75rem;
  color: rgba(255,255,255,0.35);
  padding: 10px 20px;
  border-top: 1px solid rgba(255,255,255,0.06);
}

/* ===== QUICK LINKS ===== */
.quicklinks-section {
  padding: 96px 0;
  background: var(--off-white);
}

.quicklinks-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.ql-card {
  background: var(--white);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  border: 1px solid var(--gray-100);
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.25s, transform 0.25s;
  text-decoration: none;
}
.ql-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.ql-icon { font-size: 1.5rem; }
.ql-card strong { font-size: 0.95rem; font-weight: 700; color: var(--navy); }
.ql-card span { font-size: 0.8rem; color: var(--gray-500); }

/* ===== FOOTER ===== */
.site-footer {
  background: var(--navy);
  padding: 64px 0 0;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-brand p {
  font-size: 0.875rem;
  color: var(--gray-300);
  line-height: 1.65;
  margin-top: 16px;
  max-width: 280px;
}

.footer-logo .logo-text { font-size: 0.9rem; }

.footer-nav h4 {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 16px;
}
.footer-nav ul li { margin-bottom: 8px; }
.footer-nav ul li a {
  font-size: 0.875rem;
  color: var(--gray-300);
  transition: color 0.2s;
}
.footer-nav ul li a:hover { color: var(--white); }

.footer-bottom {
  padding: 20px 0;
  text-align: center;
}
.footer-bottom p {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.35);
}
.footer-bottom a { color: var(--amber); }
.footer-bottom a:hover { text-decoration: underline; }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .guide-grid { grid-template-columns: repeat(2, 1fr); }
  .chemistry-layout { grid-template-columns: 1fr; }
  .chemistry-visual { display: none; }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .nav-links {
    display: none;
    position: absolute;
    top: 64px; left: 0; right: 0;
    background: var(--navy);
    flex-direction: column;
    padding: 16px;
    border-top: 1px solid rgba(255,255,255,0.1);
    gap: 4px;
  }
  .nav-links.open { display: flex; }
  .nav-inner { position: relative; }

  .hero { min-height: auto; padding: 60px 24px 80px; }
  .hero-content { margin: 0; }
  .hero-visual { display: none; }

  .guide-grid { grid-template-columns: 1fr; }
  .types-grid { grid-template-columns: 1fr; }
  .cost-grid { grid-template-columns: 1fr; }
  .quicklinks-grid { grid-template-columns: repeat(2, 1fr); }
  .chem-compare { grid-template-columns: 1fr; }
  .stats-inner { gap: 32px; }

  .brand-header { flex-direction: column; align-items: flex-start; gap: 8px; }

  .footer-top { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .quicklinks-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; }
  .hero-actions a { text-align: center; }
}

/* ===== REDUCED MOTION ===== */
@media (prefers-reduced-motion: reduce) {
  .drop, .ink-fill, .jar-drip, .mol, .ai-dot, .typing-dot { animation: none; }
  html { scroll-behavior: auto; }
}