:root {
  --bg-main: #0f0d0b;
  --bg-soft: rgba(255, 248, 240, 0.05);
  --bg-card: rgba(255, 248, 240, 0.07);
  --border-soft: rgba(255, 220, 180, 0.14);
  --text-main: #f5eee6;
  --text-soft: #d8c7b6;
  --text-muted: #b59f8b;
  --accent: #c97a40;
  --accent-hover: #dc8b50;
  --accent-soft: rgba(201, 122, 64, 0.16);
  --danger-soft: rgba(255, 120, 120, 0.12);
  --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.28);
  --radius-lg: 22px;
  --radius-md: 16px;
  --radius-sm: 12px;
  --max-width: 860px;
  --transition: 0.25s ease;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Cormorant Garamond", serif;
  background:
    linear-gradient(rgba(10, 8, 6, 0.82), rgba(10, 8, 6, 0.92)),
    url("../images/elpis/bg-presenza.jpg") center center / cover no-repeat fixed;
  color: var(--text-main);
  line-height: 1.5;
}

.hidden {
  display: none !important;
}

/* INTRO */

#intro {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px 20px;
}

.intro-content {
  width: 100%;
  max-width: 840px;
  text-align: center;
  padding: 48px 28px;
  background: rgba(18, 14, 10, 0.5);
  border: 1px solid var(--border-soft);
  border-radius: 30px;
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow-soft);
}

.intro-content h1 {
  margin: 0 0 24px;
  font-size: clamp(2.2rem, 5vw, 4rem);
  line-height: 1.08;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--text-main);
}

.intro-content p {
  margin: 0 0 28px;
  font-size: clamp(1.2rem, 2.2vw, 1.55rem);
  color: var(--text-soft);
}

#enterBtn {
  appearance: none;
  border: none;
  cursor: pointer;
  padding: 14px 34px;
  font-size: 1.15rem;
  font-family: inherit;
  letter-spacing: 0.02em;
  border-radius: 999px;
  background: var(--accent);
  color: #fff9f3;
  transition: transform var(--transition), background var(--transition), box-shadow var(--transition);
  box-shadow: 0 10px 22px rgba(201, 122, 64, 0.28);
}

#enterBtn:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

#enterBtn:active {
  transform: translateY(0);
}

.face-toggle {
  margin-top: 28px;
  padding: 18px 18px 14px;
  border-radius: var(--radius-md);
  background: var(--bg-soft);
  border: 1px solid var(--border-soft);
  text-align: left;
  max-width: 620px;
  margin-left: auto;
  margin-right: auto;
}

.face-toggle label {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.05rem;
  color: var(--text-main);
  cursor: pointer;
}

.face-toggle input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
  cursor: pointer;
}

.face-toggle small {
  display: block;
  margin-top: 12px;
  font-size: 0.98rem;
  line-height: 1.45;
  color: var(--text-muted);
}

/* CHAT */

#chatSection {
  min-height: 100vh;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 28px 16px 34px;
  display: flex;
  flex-direction: column;
}

.chat-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  margin-bottom: 18px;
  background: rgba(14, 11, 8, 0.74);
  border: 1px solid var(--border-soft);
  border-radius: 18px;
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-soft);
}

.chat-header h2 {
  margin: 0;
  font-size: 1.8rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--text-main);
}

#toggleFaceBtn {
  appearance: none;
  border: 1px solid var(--border-soft);
  background: var(--bg-card);
  color: var(--text-soft);
  padding: 10px 16px;
  border-radius: 999px;
  font-family: inherit;
  font-size: 1rem;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}

#toggleFaceBtn:hover {
  background: var(--accent-soft);
  border-color: rgba(201, 122, 64, 0.4);
  color: var(--text-main);
}

#chatContainer {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 8px 2px 18px;
  min-height: 52vh;
}

.message {
  max-width: 82%;
  padding: 16px 18px;
  border-radius: 18px;
  font-size: 1.18rem;
  line-height: 1.5;
  border: 1px solid var(--border-soft);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(6px);
  white-space: pre-wrap;
  word-wrap: break-word;
}

.message.elpis {
  align-self: flex-start;
  background: rgba(255, 248, 240, 0.06);
  color: var(--text-main);
}

.message.user {
  align-self: flex-end;
  background: rgba(201, 122, 64, 0.16);
  border-color: rgba(201, 122, 64, 0.24);
  color: #fff4ea;
}

.message.system {
  align-self: center;
  max-width: 92%;
  background: rgba(255, 248, 240, 0.04);
  color: var(--text-muted);
  font-size: 1rem;
  text-align: center;
}

.chat-input {
  position: sticky;
  bottom: 0;
  display: flex;
  gap: 10px;
  align-items: center;
  padding: 14px;
  background: rgba(14, 11, 8, 0.8);
  border: 1px solid var(--border-soft);
  border-radius: 20px;
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-soft);
}

#userInput {
  flex: 1;
  min-height: 54px;
  border: 1px solid var(--border-soft);
  border-radius: 16px;
  background: rgba(255, 248, 240, 0.05);
  color: var(--text-main);
  font-family: inherit;
  font-size: 1.08rem;
  padding: 14px 16px;
  outline: none;
  transition: border-color var(--transition), background var(--transition);
}

#userInput::placeholder {
  color: var(--text-muted);
}

#userInput:focus {
  border-color: rgba(201, 122, 64, 0.45);
  background: rgba(255, 248, 240, 0.08);
}

#sendBtn {
  appearance: none;
  border: none;
  cursor: pointer;
  min-width: 92px;
  height: 54px;
  padding: 0 18px;
  border-radius: 16px;
  background: var(--accent);
  color: #fff9f3;
  font-family: inherit;
  font-size: 1.02rem;
  transition: background var(--transition), transform var(--transition);
}

#sendBtn:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

#sendBtn:active {
  transform: translateY(0);
}

/* DISCLAIMER */

#disclaimer {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto 22px;
  padding: 0 16px 22px;
}

#disclaimer p {
  margin: 0 0 12px;
  padding: 16px 18px;
  border-radius: var(--radius-md);
  background: rgba(255, 248, 240, 0.05);
  border: 1px solid var(--border-soft);
  color: var(--text-soft);
  font-size: 1.02rem;
  box-shadow: var(--shadow-soft);
}

/* UPGRADE */

#upgradeSection {
  width: 100%;
  max-width: var(--max-width);
  margin: 8px auto 38px;
  padding: 0 16px;
}

#upgradeSection p {
  margin: 0 0 12px;
  padding: 18px 20px;
  border-radius: var(--radius-md);
  background: rgba(201, 122, 64, 0.1);
  border: 1px solid rgba(201, 122, 64, 0.22);
  color: #f7ede3;
  font-size: 1.05rem;
  box-shadow: var(--shadow-soft);
}

/* HELPERS */

.is-face-active {
  background: var(--accent-soft) !important;
  border-color: rgba(201, 122, 64, 0.44) !important;
  color: var(--text-main) !important;
}

.is-loading {
  opacity: 0.7;
  pointer-events: none;
}

.is-danger {
  background: var(--danger-soft) !important;
  border-color: rgba(255, 120, 120, 0.2) !important;
}

/* MOBILE */

@media (max-width: 768px) {
  #intro {
    padding: 28px 14px;
  }

  .intro-content {
    padding: 34px 18px;
    border-radius: 24px;
  }

  .intro-content h1 {
    font-size: clamp(1.9rem, 8vw, 2.8rem);
  }

  .intro-content p {
    font-size: 1.15rem;
  }

  #chatSection {
    padding: 16px 12px 22px;
  }

  .chat-header {
    padding: 12px 14px;
    border-radius: 16px;
  }

  .chat-header h2 {
    font-size: 1.5rem;
  }

  #toggleFaceBtn {
    font-size: 0.95rem;
    padding: 9px 14px;
  }

  .message {
    max-width: 92%;
    font-size: 1.08rem;
    padding: 14px 15px;
  }

  .chat-input {
    padding: 10px;
    border-radius: 16px;
  }

  #userInput {
    min-height: 50px;
    font-size: 1rem;
    padding: 12px 14px;
  }

  #sendBtn {
    min-width: 78px;
    height: 50px;
    font-size: 0.96rem;
  }

  #disclaimer p,
  #upgradeSection p {
    font-size: 0.98rem;
    padding: 15px 16px;
  }
}