/* ============================================================
   Deshi Bachelor's Recipe — Design System & Styles
   দেশি ব্যাচেলর রেসিপি
   ============================================================ */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Hind+Siliguri:wght@400;600;700&family=Noto+Sans+Bengali:wght@400;500;600;700&family=Inter:wght@400;500;600;700&display=swap');

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Food-inspired palette */
  --saffron: #F4A623;
  --curry-red: #E84C3D;
  --coriander: #27AE60;
  --rice-white: #FFF8F0;
  --dal-yellow: #F7DC6F;
  --dark-spice: #1A1A2E;
  --charcoal: #2C2C3E;
  --cream: #FDF5E6;
  --deep-brown: #3D1308;

  /* Semantic tokens */
  --bg-primary: var(--dark-spice);
  --bg-card: rgba(44, 44, 62, 0.6);
  --bg-card-solid: var(--charcoal);
  --text-primary: var(--cream);
  --text-secondary: rgba(253, 245, 230, 0.7);
  --accent: var(--saffron);
  --accent-hover: #e6991a;
  --cta: var(--curry-red);
  --cta-hover: #d44233;
  --success: var(--coriander);

  /* Typography */
  --font-heading: 'Hind Siliguri', 'Noto Sans Bengali', sans-serif;
  --font-body: 'Noto Sans Bengali', 'Inter', sans-serif;
  --font-mono: 'Fira Code', monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Radii */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 50%;
  --radius-pill: 100px;

  /* Shadows */
  --shadow-soft: 0 4px 30px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 40px rgba(244, 166, 35, 0.15);
  --shadow-btn: 0 4px 15px rgba(232, 76, 61, 0.4);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;

  /* Glassmorphism */
  --glass-bg: rgba(44, 44, 62, 0.45);
  --glass-border: rgba(253, 245, 230, 0.08);
  --glass-blur: 16px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}

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

a:hover {
  color: var(--accent-hover);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

button {
  font-family: var(--font-body);
  cursor: pointer;
  border: none;
  outline: none;
}

/* ---------- Utility Classes ---------- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
}

.text-gradient {
  background: linear-gradient(135deg, var(--saffron), var(--curry-red), var(--dal-yellow));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ---------- Reduced Motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ============================================================
   LANDING PAGE
   ============================================================ */

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-2xl) var(--space-lg);
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: url('../assets/hero-bg.jpg') center/cover no-repeat;
  opacity: 0.2;
  z-index: 0;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(26, 26, 46, 0.3) 0%,
    rgba(26, 26, 46, 0.85) 60%,
    var(--dark-spice) 100%
  );
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 750px;
}

.hero-emoji {
  font-size: 3.5rem;
  margin-bottom: var(--space-md);
  animation: float 3s ease-in-out infinite;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2.2rem, 6vw, 4rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-sm);
}

.hero-subtitle {
  font-family: var(--font-heading);
  font-size: clamp(1rem, 2.5vw, 1.4rem);
  font-weight: 400;
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
}

.hero-tagline {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--dal-yellow);
  margin-bottom: var(--space-2xl);
  opacity: 0.9;
}

/* --- CTA Button --- */
.cta-button {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-2xl);
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--rice-white);
  background: linear-gradient(135deg, var(--curry-red), #c0392b);
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-btn);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  position: relative;
  overflow: hidden;
}

.cta-button::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 30%, rgba(255, 255, 255, 0.15) 50%, transparent 70%);
  transform: translateX(-100%);
  transition: transform 0.6s ease;
}

.cta-button:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 8px 30px rgba(232, 76, 61, 0.5);
}

.cta-button:hover::before {
  transform: translateX(100%);
}

.cta-button:active {
  transform: translateY(-1px) scale(1);
}

/* --- Floating Particles --- */
.particles-container {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  overflow: hidden;
}

.particle {
  position: absolute;
  font-size: 1.8rem;
  opacity: 0;
  animation: particleFloat 8s ease-in-out infinite;
}

@keyframes particleFloat {
  0% {
    opacity: 0;
    transform: translateY(100vh) rotate(0deg);
  }
  10% {
    opacity: 0.7;
  }
  90% {
    opacity: 0.7;
  }
  100% {
    opacity: 0;
    transform: translateY(-10vh) rotate(360deg);
  }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

/* --- Features Section --- */
.features {
  position: relative;
  z-index: 2;
  padding: var(--space-3xl) var(--space-lg);
  background: linear-gradient(180deg, var(--dark-spice) 0%, #16162a 100%);
}

.features-title {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3vw, 2rem);
  text-align: center;
  margin-bottom: var(--space-2xl);
  color: var(--accent);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-xl);
  max-width: 1000px;
  margin: 0 auto;
}

.feature-card {
  padding: var(--space-xl);
  text-align: center;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-glow);
}

.feature-icon {
  font-size: 2.8rem;
  margin-bottom: var(--space-md);
  display: block;
}

.feature-title {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--saffron);
  margin-bottom: var(--space-sm);
}

.feature-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --- Footer --- */
.footer {
  text-align: center;
  padding: var(--space-xl);
  color: var(--text-secondary);
  font-size: 0.85rem;
  border-top: 1px solid var(--glass-border);
  background: #16162a;
}

.footer a {
  color: var(--accent);
}

.footer .heart {
  color: var(--curry-red);
}

/* ============================================================
   CHAT PAGE
   ============================================================ */

/* --- Chat Layout --- */
.chat-page {
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh;
  background: var(--bg-primary);
}

/* --- Top Bar --- */
.chat-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--glass-border);
  background: rgba(26, 26, 46, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  flex-shrink: 0;
}

.topbar-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--accent);
}

.topbar-brand span {
  font-size: 1.4rem;
}

.topbar-home {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-md);
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-pill);
  transition: all var(--transition-fast);
  text-decoration: none;
}

.topbar-home:hover {
  color: var(--accent);
  background: rgba(244, 166, 35, 0.1);
  border-color: rgba(244, 166, 35, 0.3);
}

/* --- Chat Messages Area --- */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  scroll-behavior: smooth;
}

/* Scrollbar styling */
.chat-messages::-webkit-scrollbar {
  width: 6px;
}

.chat-messages::-webkit-scrollbar-track {
  background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
  background: rgba(253, 245, 230, 0.15);
  border-radius: 3px;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
  background: rgba(253, 245, 230, 0.3);
}

/* --- Welcome Message --- */
.chat-welcome {
  text-align: center;
  padding: var(--space-3xl) var(--space-lg);
  max-width: 500px;
  margin: auto;
}

.chat-welcome .welcome-emoji {
  font-size: 3rem;
  margin-bottom: var(--space-md);
  animation: float 3s ease-in-out infinite;
  display: block;
}

.chat-welcome h2 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  color: var(--accent);
  margin-bottom: var(--space-sm);
}

.chat-welcome p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

.suggestion-chips {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}

.suggestion-chip {
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--accent);
  background: rgba(244, 166, 35, 0.1);
  border: 1px solid rgba(244, 166, 35, 0.25);
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.suggestion-chip:hover {
  background: rgba(244, 166, 35, 0.2);
  border-color: var(--accent);
  transform: translateY(-2px);
}

/* --- Message Bubbles --- */
.message {
  display: flex;
  gap: var(--space-sm);
  max-width: 85%;
  animation: messageSlideIn 0.3s ease-out;
}

.message.user {
  align-self: flex-end;
  flex-direction: row-reverse;
}

.message.ai {
  align-self: flex-start;
}

.message-avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.message.user .message-avatar {
  background: rgba(232, 76, 61, 0.2);
}

.message.ai .message-avatar {
  background: rgba(244, 166, 35, 0.2);
}

.message-bubble {
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  line-height: 1.8;
  word-wrap: break-word;
}

.message.user .message-bubble {
  background: linear-gradient(135deg, var(--curry-red), #c0392b);
  color: var(--rice-white);
  border-bottom-right-radius: var(--space-xs);
}

.message.ai .message-bubble {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  color: var(--cream);
  border-bottom-left-radius: var(--space-xs);
}

/* Markdown inside AI messages */
.message.ai .message-bubble h2,
.message.ai .message-bubble h3 {
  font-family: var(--font-heading);
  color: var(--saffron);
  margin: var(--space-md) 0 var(--space-sm);
}

.message.ai .message-bubble h2:first-child,
.message.ai .message-bubble h3:first-child {
  margin-top: 0;
}

.message.ai .message-bubble strong {
  color: var(--saffron);
}

.message.ai .message-bubble ul,
.message.ai .message-bubble ol {
  padding-left: var(--space-lg);
  margin: var(--space-sm) 0;
}

.message.ai .message-bubble li {
  margin-bottom: var(--space-xs);
}

.message.ai .message-bubble p {
  margin-bottom: var(--space-sm);
}

.message.ai .message-bubble p:last-child {
  margin-bottom: 0;
}

@keyframes messageSlideIn {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --- Typing Indicator --- */
.typing-indicator {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  max-width: 85%;
}

.typing-indicator .message-avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
  background: rgba(244, 166, 35, 0.2);
}

.typing-dots {
  display: flex;
  gap: 4px;
  padding: var(--space-md) var(--space-lg);
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  border-bottom-left-radius: var(--space-xs);
}

.typing-dots span {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  background: var(--accent);
  animation: typingBounce 1.4s ease-in-out infinite;
}

.typing-dots span:nth-child(2) { animation-delay: 0.2s; }
.typing-dots span:nth-child(3) { animation-delay: 0.4s; }

@keyframes typingBounce {
  0%, 60%, 100% {
    transform: translateY(0);
    opacity: 0.4;
  }
  30% {
    transform: translateY(-8px);
    opacity: 1;
  }
}

/* --- Chat Input Bar --- */
.chat-input-bar {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  border-top: 1px solid var(--glass-border);
  background: rgba(26, 26, 46, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  flex-shrink: 0;
}

.chat-input {
  flex: 1;
  padding: var(--space-md) var(--space-lg);
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--cream);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-pill);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.chat-input::placeholder {
  color: var(--text-secondary);
}

.chat-input:focus {
  border-color: rgba(244, 166, 35, 0.4);
  box-shadow: 0 0 0 3px rgba(244, 166, 35, 0.1);
}

.send-button {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--curry-red), #c0392b);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  box-shadow: var(--shadow-btn);
}

.send-button:hover {
  transform: scale(1.08);
  box-shadow: 0 6px 20px rgba(232, 76, 61, 0.5);
}

.send-button:active {
  transform: scale(0.95);
}

.send-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

/* --- Error Toast --- */
.error-toast {
  position: fixed;
  bottom: 100px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  padding: var(--space-md) var(--space-lg);
  background: rgba(232, 76, 61, 0.95);
  color: white;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition-base);
  z-index: 100;
  max-width: 90%;
  text-align: center;
}

.error-toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */

@media (max-width: 768px) {
  .hero {
    padding: var(--space-xl) var(--space-md);
  }

  .hero-emoji {
    font-size: 2.5rem;
  }

  .features-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .feature-card {
    padding: var(--space-lg);
  }

  .chat-messages {
    padding: var(--space-md);
  }

  .message {
    max-width: 92%;
  }

  .chat-input-bar {
    padding: var(--space-sm) var(--space-md);
  }

  .chat-input {
    padding: var(--space-sm) var(--space-md);
    font-size: 0.95rem;
  }

  .send-button {
    width: 42px;
    height: 42px;
  }

  .chat-welcome {
    padding: var(--space-xl) var(--space-md);
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.8rem;
  }

  .cta-button {
    padding: var(--space-md) var(--space-xl);
    font-size: 1.1rem;
  }

  .topbar-brand {
    font-size: 1rem;
  }

  .suggestion-chips {
    flex-direction: column;
    align-items: center;
  }
}