/* --------------------------------------------------
   CineAHO Daily Recommended Water Intake Calculator
   Custom Styling - Premium Cyber Dark Theme
-------------------------------------------------- */

/* Root Theme Color Variables */
:root {
  --bg-color: #060913;
  --bg-grid: rgba(255, 255, 255, 0.015);
  
  --panel-bg: rgba(14, 20, 38, 0.55);
  --panel-border: rgba(255, 255, 255, 0.06);
  --panel-hover-border: rgba(37, 99, 235, 0.35);
  
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dark: #475569;
  
  /* Hydration Theme Specific Colors */
  --water-blue: #0ea5e9;
  --water-blue-rgb: 14, 165, 233;
  --neon-blue-glow: 0 0 25px rgba(14, 165, 233, 0.35);
  
  --purple-accent: #a855f7;
  --purple-glow: 0 0 25px rgba(168, 85, 247, 0.25);
  
  --warn-orange: #f97316;
  --warn-glow: 0 0 20px rgba(249, 115, 22, 0.2);
  
  --font-main: 'Noto Sans KR', 'Inter', sans-serif;
  --font-display: 'Outfit', sans-serif;
  --transition-smooth: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-card: 0 16px 40px 0 rgba(0, 0, 0, 0.45);
}

/* Light Theme Variables */
[data-theme="light"] {
  --bg-color: #f0f4f8;
  --bg-grid: rgba(15, 23, 42, 0.02);
  
  --panel-bg: rgba(255, 255, 255, 0.85);
  --panel-border: rgba(15, 23, 42, 0.08);
  --panel-hover-border: rgba(14, 165, 233, 0.45);
  
  --text-main: #0f172a;
  --text-muted: #57657a;
  --text-dark: #94a3b8;
  
  --neon-blue-glow: 0 8px 25px rgba(14, 165, 233, 0.18);
  --purple-glow: 0 8px 25px rgba(168, 85, 247, 0.12);
  --shadow-card: 0 12px 35px 0 rgba(15, 23, 42, 0.07);
}

/* Global Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-color);
  color: var(--text-main);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  line-height: 1.6;
  transition: background-color 0.4s ease, color 0.3s ease;
}

/* Background Grid Pattern */
body::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(var(--bg-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--bg-grid) 1px, transparent 1px);
  background-size: 40px 40px;
  z-index: -2;
  pointer-events: none;
}

/* Background Glow Orbs */
.bg-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(140px);
  z-index: -3;
  pointer-events: none;
  opacity: 0.28;
  transition: opacity 0.5s ease;
}

.bg-glow-blue {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--water-blue) 0%, transparent 70%);
  top: -150px;
  left: 5%;
}

.bg-glow-purple {
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, var(--purple-accent) 0%, transparent 70%);
  bottom: 10%;
  right: 5%;
}

[data-theme="light"] .bg-glow {
  opacity: 0.12;
}

/* Glassmorphism Panel Common */
.glass-panel {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-radius: 24px;
  box-shadow: var(--shadow-card);
  transition: var(--transition-smooth);
}

.glass-panel:hover {
  border-color: var(--panel-hover-border);
}

/* Premium Header Navigation */
.main-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
  margin: 1.25rem 1.5rem 0 1.5rem;
  border-radius: 50px;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.back-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--text-main);
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.back-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  transform: translateX(-2px);
}

.app-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-icon {
  font-size: 1.5rem;
  color: var(--water-blue);
  filter: drop-shadow(0 0 8px rgba(14, 165, 233, 0.6));
}

.logo-text {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.logo-text span {
  color: var(--water-blue);
  font-weight: 500;
}

.app-version {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 2px 8px;
  background: rgba(14, 165, 233, 0.1);
  color: var(--water-blue);
  border-radius: 12px;
  letter-spacing: 0.5px;
}

.header-action-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1.15rem;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--text-main);
  font-weight: 600;
  font-size: 0.82rem;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.header-action-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--water-blue);
  box-shadow: 0 0 10px rgba(14, 165, 233, 0.15);
}

/* Calculator Grid Structure */
.calculator-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.calculator-grid {
  display: grid;
  grid-template-columns: 53% 47%;
  gap: 2rem;
  align-items: start;
}

/* Panels Common */
.panel-header {
  margin-bottom: 2rem;
}

.panel-header h2 {
  font-size: 1.45rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.4rem;
}

.panel-header h2 i {
  color: var(--water-blue);
}

.panel-header p {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.input-section {
  padding: 2.25rem;
}

/* Input Elements Styling */
.input-group {
  margin-bottom: 2.25rem;
}

.input-group:last-child {
  margin-bottom: 0;
}

.input-label-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.85rem;
}

.input-label-row label {
  font-size: 1.02rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.input-label-row label i {
  color: var(--water-blue);
}

.value-display {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-main);
  background: rgba(14, 165, 233, 0.08);
  padding: 4px 12px;
  border-radius: 12px;
  border: 1px solid rgba(14, 165, 233, 0.15);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.value-display strong {
  color: var(--water-blue);
  font-size: 1.35rem;
  font-weight: 800;
}

/* Range Slider Custom Styling */
.slider-wrapper {
  margin-bottom: 0.85rem;
}

.styled-slider {
  -webkit-appearance: none;
  width: 100%;
  height: 8px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.08);
  outline: none;
  transition: background 0.3s;
}

[data-theme="light"] .styled-slider {
  background: rgba(15, 23, 42, 0.08);
}

.styled-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--water-blue);
  border: 4px solid var(--bg-color);
  box-shadow: 0 0 10px rgba(14, 165, 233, 0.6);
  cursor: pointer;
  transition: transform 0.1s, background-color 0.2s;
}

.styled-slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  background: #38bdf8;
}

.styled-slider::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--water-blue);
  border: 4px solid var(--bg-color);
  box-shadow: 0 0 10px rgba(14, 165, 233, 0.6);
  cursor: pointer;
  transition: transform 0.1s, background-color 0.2s;
}

.styled-slider::-moz-range-thumb:hover {
  transform: scale(1.2);
  background: #38bdf8;
}

/* Preset Quick Buttons */
.preset-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.btn-preset {
  padding: 0.45rem 0.95rem;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.06);
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition-smooth);
}

[data-theme="light"] .btn-preset {
  background: rgba(15, 23, 42, 0.03);
  border-color: rgba(15, 23, 42, 0.05);
}

.btn-preset:hover {
  background: rgba(14, 165, 233, 0.08);
  border-color: var(--water-blue);
  color: var(--water-blue);
}

.btn-preset.active {
  background: var(--water-blue);
  border-color: var(--water-blue);
  color: #000000;
  font-weight: 700;
  box-shadow: 0 4px 12px rgba(14, 165, 233, 0.3);
}

/* Multichoice Check Options */
.section-label {
  display: block;
  font-size: 1.02rem;
  font-weight: 700;
  margin-bottom: 0.85rem;
}

.option-grid {
  display: grid;
  gap: 0.85rem;
}

.option-4-cols {
  grid-template-columns: repeat(4, 1fr);
}

.btn-option {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1rem 0.5rem;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition-smooth);
  text-align: center;
}

[data-theme="light"] .btn-option {
  background: rgba(15, 23, 42, 0.02);
  border-color: rgba(15, 23, 42, 0.05);
}

.btn-option:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.15);
  transform: translateY(-2px);
}

.btn-option.active {
  background: rgba(14, 165, 233, 0.08);
  border-color: var(--water-blue);
  color: var(--text-main);
  box-shadow: var(--neon-blue-glow), inset 0 0 10px rgba(14, 165, 233, 0.08);
}

.option-icon {
  font-size: 1.35rem;
  margin-bottom: 0.5rem;
  color: var(--text-muted);
  transition: var(--transition-smooth);
}

.btn-option.active .option-icon {
  color: var(--water-blue);
  transform: scale(1.1);
  filter: drop-shadow(0 0 5px rgba(14, 165, 233, 0.4));
}

.option-title {
  font-size: 0.82rem;
  font-weight: 700;
  margin-bottom: 0.2rem;
}

.option-sub {
  font-size: 0.72rem;
  opacity: 0.75;
}

.input-tip-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.6rem;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.input-tip-desc i {
  color: var(--water-blue);
}

/* Results Sidebar Panels */
.result-section {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.result-card {
  padding: 2.25rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.main-result-glow {
  border-color: rgba(14, 165, 233, 0.15);
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.5), 0 0 40px rgba(14, 165, 233, 0.1);
}

/* Droplet Vector Frame and Waves */
.droplet-container {
  display: flex;
  justify-content: center;
  margin-bottom: 2.25rem;
  position: relative;
}

.water-droplet {
  width: 200px;
  height: 200px;
  background: linear-gradient(180deg, rgba(14, 165, 233, 0.05) 0%, rgba(14, 165, 233, 0.25) 100%);
  border: 2px solid rgba(14, 165, 233, 0.3);
  border-radius: 0% 100% 100% 100%; /* Classic teardrop droplet shape */
  transform: rotate(45deg);
  position: relative;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(14, 165, 233, 0.2), inset 0 0 20px rgba(14, 165, 233, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Wave animation inside droplet */
.water-wave {
  position: absolute;
  bottom: -40%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: rgba(14, 165, 233, 0.5);
  border-radius: 43%;
  animation: waveRotation 12s infinite linear;
  transform-origin: center center;
  z-index: 1;
  pointer-events: none;
  transition: bottom 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes waveRotation {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.droplet-content {
  transform: rotate(-45deg); /* Counteract droplet rotation */
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  color: #ffffff;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.6);
}

.droplet-title {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  opacity: 0.85;
  margin-bottom: 0.25rem;
}

.droplet-number {
  font-family: var(--font-display);
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1;
}

.droplet-number strong {
  font-weight: 800;
}

.droplet-unit {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
  opacity: 0.9;
}

.droplet-sub-desc {
  font-size: 0.7rem;
  opacity: 0.8;
  white-space: nowrap;
}

/* Cups Visualizer Grid */
.cups-visualizer {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 1.5rem;
}

.cups-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.6rem;
  max-width: 380px;
  margin: 0 auto;
}

.cup-icon-item {
  font-size: 1.35rem;
  color: rgba(255, 255, 255, 0.1);
  transition: var(--transition-smooth);
}

.cup-icon-item.active {
  color: var(--water-blue);
  filter: drop-shadow(0 0 5px rgba(14, 165, 233, 0.6));
  transform: scale(1.15);
}

/* Detail Calculator Table Card */
.detail-card {
  padding: 1.75rem 2rem;
}

.detail-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.detail-card h3 i {
  color: var(--water-blue);
}

.breakdown-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.breakdown-item {
  display: flex;
  justify-content: space-between;
  font-size: 0.88rem;
  color: var(--text-muted);
  border-bottom: 1px dashed rgba(255, 255, 255, 0.05);
  padding-bottom: 0.6rem;
}

.breakdown-item:last-of-type {
  border-bottom: none;
}

.item-val {
  font-weight: 600;
  color: var(--text-main);
}

.text-plus {
  color: var(--water-blue);
}

.breakdown-total {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  margin-top: 0.5rem;
}

.total-label {
  font-size: 0.95rem;
  font-weight: 700;
}

.total-val {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--water-blue);
  filter: drop-shadow(0 0 8px rgba(14, 165, 233, 0.3));
}

/* Time slots recommendation styles */
.time-slots-card {
  padding: 1.75rem 2rem;
}

.time-slots-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.time-slots-card h3 i {
  color: var(--water-blue);
}

.section-sub-desc {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.slots-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.85rem;
  margin-bottom: 1.25rem;
}

.slot-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.04);
  border-radius: 16px;
  padding: 1rem 0.5rem;
  text-align: center;
  transition: var(--transition-smooth);
}

.slot-item:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
}

.slot-icon-box {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  margin-bottom: 0.6rem;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
}

.slot-icon-box.morning {
  background: rgba(249, 115, 22, 0.1);
  color: #f97316;
}

.slot-icon-box.afternoon {
  background: rgba(234, 179, 8, 0.1);
  color: #eab308;
}

.slot-icon-box.evening {
  background: rgba(168, 85, 247, 0.1);
  color: #a855f7;
}

.slot-info {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.slot-name {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 700;
  margin-bottom: 0.15rem;
}

.slot-val {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.1rem;
}

.slot-pct {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--water-blue);
  background: rgba(14, 165, 233, 0.08);
  padding: 1px 6px;
  border-radius: 8px;
}

.slot-hint-text {
  font-size: 0.72rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.slot-hint-text i {
  color: var(--warn-orange);
}

/* Food Index Section Styles */
.food-section {
  padding: 2.25rem;
}

.section-title-wrapper {
  margin-bottom: 1.75rem;
}

.section-title-wrapper h2 {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.4rem;
}

.section-title-wrapper h2 i {
  color: var(--water-blue);
}

.section-title-wrapper p {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.food-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 1rem;
}

.food-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.04);
  border-radius: 20px;
  padding: 1.15rem 1rem;
  text-align: center;
  transition: var(--transition-smooth);
}

.food-card:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.1);
  transform: translateY(-4px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.food-emoji {
  font-size: 2.2rem;
  margin-bottom: 0.75rem;
}

.food-info {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.food-name-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.food-name {
  font-size: 0.82rem;
  font-weight: 700;
}

.food-percent {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--water-blue);
}

.progress-track {
  height: 6px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 3px;
  overflow: hidden;
}

[data-theme="light"] .progress-track {
  background: rgba(15, 23, 42, 0.08);
}

.progress-bar {
  height: 100%;
  border-radius: 3px;
}

.bar-watermelon { background: linear-gradient(90deg, #f43f5e, #be123c); }
.bar-cucumber { background: linear-gradient(90deg, #10b981, #047857); }
.bar-tomato { background: linear-gradient(90deg, #ef4444, #b91c1c); }
.bar-strawberry { background: linear-gradient(90deg, #ec4899, #be185d); }
.bar-orange { background: linear-gradient(90deg, #f97316, #c2410c); }
.bar-lettuce { background: linear-gradient(90deg, #22c55e, #15803d); }

.food-tip-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 1.15rem;
}

/* Drink equivalents Section Styles */
.drink-equivalents-section {
  padding: 2.25rem;
}

.drinks-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 1rem;
}

.drink-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.04);
  border-radius: 20px;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1rem;
  transition: var(--transition-smooth);
}

.drink-card:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.1);
  transform: translateY(-4px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.drink-card.warning-card {
  border-color: rgba(249, 115, 22, 0.15);
  background: rgba(249, 115, 22, 0.01);
}

.drink-card.warning-card:hover {
  border-color: var(--warn-orange);
  background: rgba(249, 115, 22, 0.04);
}

.drink-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.drink-icon {
  font-size: 1.5rem;
}

.text-blue {
  color: var(--water-blue);
}

.drink-badge {
  font-size: 0.68rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 8px;
}

.badge-safe {
  background: rgba(16, 185, 129, 0.1);
  color: #10b981;
}

.badge-warn {
  background: rgba(249, 115, 22, 0.1);
  color: var(--warn-orange);
}

.drink-body h3 {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.25rem;
}

.drink-count-display {
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--water-blue);
}

.drink-count-display.text-warn {
  color: var(--warn-orange);
}

.drink-footer {
  font-size: 0.72rem;
  color: var(--text-muted);
  line-height: 1.35;
}

.warn-footer {
  color: rgba(249, 115, 22, 0.8);
  display: flex;
  gap: 0.25rem;
}

.warn-footer i {
  margin-top: 2px;
}

/* Guide Section Styles */
.guide-section {
  padding: 2.5rem;
}

.guide-header {
  margin-bottom: 2.25rem;
}

.guide-header h2 {
  font-size: 1.45rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.4rem;
}

.guide-header h2 i {
  color: var(--water-blue);
}

.guide-header p {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-bottom: 2.25rem;
}

.guide-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.04);
  border-radius: 20px;
  padding: 1.75rem;
  transition: var(--transition-smooth);
}

[data-theme="light"] .guide-card {
  background: rgba(15, 23, 42, 0.02);
  border-color: rgba(15, 23, 42, 0.04);
}

.guide-card:hover {
  border-color: rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.03);
}

.guide-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 1.15rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-main);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  padding-bottom: 0.6rem;
}

.guide-card h3 i {
  color: var(--water-blue);
}

/* Steps list */
.guide-steps {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.guide-steps li {
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--text-muted);
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
}

.guide-steps li span {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: rgba(14, 165, 233, 0.15);
  color: var(--water-blue);
  font-size: 0.72rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 2px;
}

.guide-steps li strong {
  color: var(--text-main);
}

/* Formula Box */
.formula-box {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.formula-math {
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 12px;
  padding: 1rem;
  font-family: var(--font-display), monospace;
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--water-blue);
}

.formula-example {
  font-size: 0.75rem;
  border-top: 1px dashed rgba(255, 255, 255, 0.05);
  padding-top: 0.6rem;
}

/* Checklist details */
.dehydration-checklist {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.check-box {
  padding: 1rem;
  border-radius: 12px;
}

.check-mild {
  background: rgba(234, 179, 8, 0.03);
  border: 1px solid rgba(234, 179, 8, 0.12);
}

.check-mild h4 {
  color: #eab308;
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.check-severe {
  background: rgba(239, 68, 68, 0.03);
  border: 1px solid rgba(239, 68, 68, 0.12);
}

.check-severe h4 {
  color: #ef4444;
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.check-box ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.check-box ul li {
  font-size: 0.78rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.check-box ul li i {
  font-size: 0.4rem;
}

.check-mild ul li i {
  color: #eab308;
}

.check-severe ul li i {
  color: #ef4444;
  font-size: 0.7rem;
}

/* Tips list */
.tips-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.tips-list li {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
  display: flex;
  gap: 0.5rem;
  align-items: flex-start;
}

.tips-list li i {
  color: var(--water-blue);
  margin-top: 4px;
  font-size: 0.95rem;
}

.tips-list li strong {
  color: var(--text-main);
}

/* FAQ container styling */
.faq-container {
  margin-top: 2.25rem;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 2rem;
}

.faq-container h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.faq-container h3 i {
  color: var(--water-blue);
}

.faq-item {
  margin-bottom: 1.25rem;
  background: rgba(255, 255, 255, 0.01);
  padding: 1rem 1.25rem;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.03);
}

.faq-item:last-child {
  margin-bottom: 0;
}

.faq-question {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.4rem;
}

.faq-answer {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Precautions Alert styling */
.precautions-alert {
  margin-top: 2rem;
  padding: 1.25rem 1.5rem;
  border-radius: 16px;
  background: rgba(239, 68, 68, 0.03);
  border: 1px solid rgba(239, 68, 68, 0.15);
}

.precautions-alert h4 {
  color: #ef4444;
  font-size: 0.92rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
}

.precautions-alert ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.precautions-alert ul li {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.45;
  position: relative;
  padding-left: 0.85rem;
}

.precautions-alert ul li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: #ef4444;
  font-weight: bold;
}

/* Footer Section */
.calculator-footer {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 1.5rem 0;
  margin-top: 2rem;
}

.footer-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 1.5rem;
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* --------------------------------------------------
   Responsive Design Breakpoints
-------------------------------------------------- */

@media (max-width: 1200px) {
  .food-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
  }
  
  .drinks-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
  }
}

@media (max-width: 992px) {
  .calculator-grid {
    grid-template-columns: 1fr;
  }
  
  .main-header {
    margin: 1rem 1rem 0 1rem;
    padding: 0.75rem 1.25rem;
  }
  
  .input-section {
    padding: 1.75rem;
  }
  
  .guide-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .option-4-cols {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .food-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .drinks-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .logo-text {
    font-size: 0.95rem;
  }
  
  .app-version {
    display: none;
  }
  
  .main-header {
    padding: 0.5rem 1rem;
  }
  
  .calculator-container {
    padding: 1rem;
  }
  
  .droplet-number {
    font-size: 2.2rem;
  }
  
  .water-droplet {
    width: 160px;
    height: 160px;
  }
  
  .droplet-sub-desc {
    font-size: 0.65rem;
  }
}

@media (max-width: 400px) {
  .food-grid {
    grid-template-columns: 1fr;
  }
  
  .drinks-grid {
    grid-template-columns: 1fr;
  }
  
  .slots-grid {
    grid-template-columns: 1fr;
  }
}