:root {
  --ios-blue: #007AFF;
  --ios-gray-bg: #F5F5F7;
  --ios-sidebar-bg: rgba(250, 250, 252, 0.8);
  --ios-border: rgba(209, 209, 214, 0.6);
  --ios-bubble-sent: #007AFF;
  --ios-bubble-received: #E9E9EB;
  --ios-text-dark: #1C1C1E;
  --ios-text-light: #8E8E93;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px; /* Increased base font size */
}

body {
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  height: 100vh;
  height: 100dvh;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
  margin: 0;
  padding: 0;
}

/* Login Overlay with iOS Liquid Glass */
.login-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(25px) saturate(180%);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.login-card {
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(35px) saturate(200%);
  padding: 45px 35px;
  border-radius: 24px;
  width: 100%;
  max-width: 380px;
  text-align: center;
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15), inset 0 0 0 1px rgba(255, 255, 255, 0.6);
}

.watermelon-logo {
  font-size: 3.5rem;
  margin-bottom: 12px;
}

.login-card h2 {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--ios-text-dark);
  margin-bottom: 8px;
}

.login-card p {
  font-size: 1.05rem;
  color: var(--ios-text-light);
  margin-bottom: 28px;
}

.login-card form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.login-card input {
  padding: 14px 18px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--ios-border);
  border-radius: 12px;
  font-size: 1.1rem;
  outline: none;
  transition: all 0.2s;
}

.login-card input:focus {
  border-color: var(--ios-blue);
  box-shadow: 0 0 0 4px rgba(0, 122, 255, 0.15);
}

.login-card button {
  background-color: var(--ios-blue);
  color: white;
  border: none;
  padding: 14px;
  border-radius: 12px;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

.login-card button:hover {
  background-color: #0062cc;
}

.login-error {
  color: #FF3B30;
  font-size: 0.95rem;
  margin-top: 12px;
}

/* Main Container with iOS Liquid Glass */
.imessage-container {
  width: 100%;
  max-width: 1150px;
  height: 94vh;
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(35px) saturate(200%);
  border-radius: 20px;
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.15), inset 0 0 0 1px rgba(255, 255, 255, 0.6);
  display: flex;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.5);
}

/* Sidebar */
.sidebar {
  width: 360px;
  background: rgba(250, 250, 252, 0.75);
  backdrop-filter: blur(25px);
  border-right: 1px solid var(--ios-border);
  display: flex;
  flex-direction: column;
}

.sidebar-header {
  padding: 18px;
  border-bottom: 1px solid var(--ios-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
  background: rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(15px);
}

.logout-btn {
  background: none;
  border: none;
  color: var(--ios-text-light);
  font-size: 1.25rem;
  cursor: pointer;
  padding: 8px;
  border-radius: 50%;
  transition: background 0.15s, color 0.15s;
}

.logout-btn:hover {
  background-color: rgba(0, 0, 0, 0.06);
  color: #FF3B30;
}

.user-profile {
  display: flex;
  align-items: center;
  gap: 14px;
}

.avatar {
  width: 48px;
  height: 48px;
  background-color: var(--ios-blue);
  color: white;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  font-weight: 600;
  font-size: 1.25rem;
  overflow: hidden;
  background-size: cover;
  background-position: center;
}

.avatar.small {
  width: 40px;
  height: 40px;
  font-size: 1.05rem;
}

.user-meta {
  display: flex;
  flex-direction: column;
}

.my-name {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--ios-text-dark);
}

.status-online-text {
  font-size: 0.9rem;
  color: #34C759;
  font-weight: 500;
}

.sidebar-search {
  padding: 14px 18px;
  border-bottom: 1px solid var(--ios-border);
  background: rgba(255, 255, 255, 0.2);
}

#search-form {
  position: relative;
  display: flex;
  align-items: center;
}

#search-form i {
  position: absolute;
  left: 14px;
  color: var(--ios-text-light);
  font-size: 1rem;
}

#search-input {
  width: 100%;
  background: rgba(240, 240, 245, 0.8);
  border: 1px solid var(--ios-border);
  padding: 10px 14px 10px 38px;
  border-radius: 12px;
  font-size: 1.05rem;
  outline: none;
  color: var(--ios-text-dark);
}

#search-input::placeholder {
  color: var(--ios-text-light);
}

.search-error {
  color: #FF3B30;
  font-size: 0.85rem;
  margin-top: 6px;
  padding-left: 4px;
}

.conversation-list-container {
  flex: 1;
  overflow-y: auto;
}

.conversation-list {
  list-style: none;
}

.no-conversations {
  padding: 24px;
  text-align: center;
  color: var(--ios-text-light);
  font-size: 1rem;
}

.conversation-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  border-bottom: 1px solid rgba(0, 0, 0, 0.04);
  cursor: pointer;
  transition: background 0.15s;
}

.conversation-item:hover {
  background-color: rgba(0, 0, 0, 0.04);
}

.conversation-item.active {
  background-color: rgba(0, 122, 255, 0.12);
}

.conv-info {
  flex: 1;
  overflow: hidden;
}

.conv-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 4px;
}

.conv-username {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--ios-text-dark);
}

.conv-time {
  font-size: 0.85rem;
  color: var(--ios-text-light);
}

.conv-preview {
  font-size: 0.95rem;
  color: var(--ios-text-light);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Chat Area */
.chat-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: rgba(255, 255, 255, 0.5);
  backdrop-filter: blur(20px);
}

.chat-empty-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  color: var(--ios-text-light);
  text-align: center;
  padding: 24px;
}

.empty-icon {
  font-size: 4rem;
  color: var(--ios-border);
  margin-bottom: 18px;
}

.chat-empty-state h2 {
  font-size: 1.6rem;
  color: var(--ios-text-dark);
  margin-bottom: 8px;
}

.chat-empty-state p {
  font-size: 1.1rem;
}

/* Active Chat Box */
.chat-box {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  position: relative;
}

.chat-header {
  padding: 12px 18px;
  background: rgba(250, 250, 252, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--ios-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}

.back-btn {
  display: none;
  background: none;
  border: none;
  color: var(--ios-blue);
  font-size: 1.25rem;
  cursor: pointer;
  padding-right: 12px;
}

.chat-contact-info {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
}

.chat-contact-info h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--ios-text-dark);
}

.status-sub {
  font-size: 0.85rem;
  color: var(--ios-text-light);
  font-weight: 500;
}

.status-sub.online {
  color: #34C759;
}

.chat-header-actions {
  color: var(--ios-blue);
  font-size: 1.35rem;
  cursor: pointer;
}

/* Messages Scroll */
.messages-scroll {
  flex: 1;
  min-height: 0;
  padding: 24px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: transparent;
}

.message-row {
  display: flex;
  flex-direction: column;
  max-width: 75%;
}

.message-row.sent {
  align-self: flex-end;
  align-items: flex-end;
}

.message-row.received {
  align-self: flex-start;
  align-items: flex-start;
}

.msg-bubble {
  padding: 12px 16px;
  border-radius: 20px;
  font-size: 1.05rem;
  line-height: 1.45;
  word-break: break-word;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.message-row.sent .msg-bubble {
  background-color: var(--ios-bubble-sent);
  color: white;
  border-bottom-right-radius: 4px;
}

.message-row.received .msg-bubble {
  background-color: var(--ios-bubble-received);
  color: var(--ios-text-dark);
  border-bottom-left-radius: 4px;
}

.chat-media-item {
  max-width: 200px;
  max-height: 200px;
  border-radius: 12px;
  object-fit: cover;
  display: block;
}

.msg-meta {
  font-size: 0.8rem;
  color: var(--ios-text-light);
  margin-top: 4px;
  padding: 0 6px;
}

/* Emoji Picker */
.emoji-picker {
  background: rgba(250, 250, 252, 0.9);
  backdrop-filter: blur(25px);
  border-top: 1px solid var(--ios-border);
  padding: 14px;
  flex-shrink: 0;
}

.emoji-category {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 1.5rem;
  justify-content: center;
  cursor: pointer;
}

.emoji-category span {
  padding: 6px;
  border-radius: 8px;
  transition: background 0.15s;
}

.emoji-category span:hover {
  background-color: rgba(0, 0, 0, 0.08);
}

/* Sticker & GIF Picker */
.sticker-picker {
  background: rgba(250, 250, 252, 0.92);
  backdrop-filter: blur(25px) saturate(180%);
  border-top: 1px solid var(--ios-border);
  padding: 14px;
  max-height: 240px;
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.picker-header-tabs {
  display: flex;
  gap: 12px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--ios-border);
  padding-bottom: 8px;
}

.picker-tab {
  background: none;
  border: none;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ios-text-light);
  cursor: pointer;
  padding: 6px 12px;
  border-radius: 10px;
  transition: all 0.2s;
}

.picker-tab.active {
  color: var(--ios-blue);
  background-color: rgba(0, 122, 255, 0.12);
}

.picker-body {
  overflow-y: auto;
  max-height: 160px;
}

.picker-pane {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.sticker-item, .gif-item {
  background: rgba(255, 255, 255, 0.9);
  border-radius: 12px;
  overflow: hidden;
  cursor: pointer;
  border: 1px solid var(--ios-border);
  display: flex;
  justify-content: center;
  align-items: center;
  height: 80px;
  transition: transform 0.15s, box-shadow 0.15s;
}

.sticker-item:hover, .gif-item:hover {
  transform: scale(1.04);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.12);
}

.sticker-item img, .gif-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Message Form */
.message-form {
  padding: 14px 18px;
  background: rgba(250, 250, 252, 0.85);
  backdrop-filter: blur(20px);
  border-top: 1px solid var(--ios-border);
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.icon-btn {
  background: none;
  border: none;
  color: var(--ios-blue);
  font-size: 1.45rem;
  cursor: pointer;
  padding: 6px;
  transition: opacity 0.15s;
}

.icon-btn:hover {
  opacity: 0.8;
}

.message-form input {
  flex: 1;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--ios-border);
  padding: 12px 16px;
  border-radius: 22px;
  font-size: 1.05rem;
  outline: none;
  color: var(--ios-text-dark);
}

.message-form input:focus {
  border-color: var(--ios-blue);
  box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.15);
}

.send-btn {
  width: 40px;
  height: 40px;
  background-color: var(--ios-blue);
  color: white;
  border: none;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  font-size: 1rem;
  transition: background 0.2s;
}

.send-btn:hover {
  background-color: #0062cc;
}

/* Attachment Menu Popup */
.attachment-menu {
  position: absolute;
  bottom: 75px;
  left: 16px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(25px) saturate(180%);
  border: 1px solid var(--ios-border);
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
  display: flex;
  flex-direction: column;
  padding: 8px;
  z-index: 100;
  min-width: 250px;
}

.attachment-menu button {
  background: none;
  border: none;
  padding: 12px 14px;
  text-align: left;
  font-size: 1rem;
  color: var(--ios-text-dark);
  cursor: pointer;
  border-radius: 8px;
  display: flex;
  align-items: center;
  gap: 12px;
  transition: background 0.15s;
}

.attachment-menu button:hover {
  background-color: rgba(0, 122, 255, 0.1);
  color: var(--ios-blue);
}

.attachment-menu button i {
  font-size: 1.15rem;
  color: var(--ios-blue);
  width: 24px;
  text-align: center;
}

.file-message {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1rem;
}

.file-message i {
  font-size: 1.4rem;
  color: var(--ios-blue);
}

.file-message a {
  color: inherit;
  text-decoration: underline;
  word-break: break-all;
}

/* Responsive */
@media (max-width: 768px) {
  .imessage-container {
    height: 100vh;
    height: 100dvh;
    border-radius: 0;
    border: none;
  }
  .sidebar {
    width: 100%;
    display: flex;
  }
  .sidebar.hidden {
    display: none;
  }
  .chat-area {
    display: none;
  }
  .chat-area.active {
    display: flex;
    width: 100%;
  }
  .back-btn {
    display: inline-block;
  }
  .message-form {
    padding: 10px 12px;
    gap: 8px;
  }
  .icon-btn {
    font-size: 1.25rem;
    padding: 4px;
    flex-shrink: 0;
  }
  .send-btn {
    width: 36px;
    height: 36px;
    flex-shrink: 0;
  }
  #message-input {
    min-width: 0;
    flex: 1;
    font-size: 1rem;
    padding: 10px 12px;
  }
}

/* Call Overlay */
.call-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(30px) saturate(180%);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 2000;
}

.call-card {
  background: rgba(30, 30, 30, 0.9);
  backdrop-filter: blur(40px);
  padding: 40px;
  border-radius: 28px;
  width: 100%;
  max-width: 440px;
  text-align: center;
  color: white;
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4), inset 0 0 0 1px rgba(255, 255, 255, 0.15);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.call-avatar {
  width: 90px;
  height: 90px;
  background-color: var(--ios-blue);
  color: white;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 2.5rem;
  font-weight: 700;
  overflow: hidden;
  background-size: cover;
  background-position: center;
  box-shadow: 0 10px 25px rgba(0, 122, 255, 0.4);
}

.call-card h3 {
  font-size: 1.5rem;
  font-weight: 700;
}

.call-card p {
  font-size: 1.05rem;
  color: #EBEBF5;
}

.call-media-container {
  position: relative;
  width: 100%;
  height: 280px;
  background: #000;
  border-radius: 16px;
  overflow: hidden;
  margin-top: 10px;
}

#remote-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

#local-video {
  position: absolute;
  bottom: 12px;
  right: 12px;
  width: 90px;
  height: 120px;
  object-fit: cover;
  border-radius: 10px;
  border: 2px solid white;
}

.call-actions {
  display: flex;
  gap: 28px;
  margin-top: 16px;
}

.call-btn {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  border: none;
  font-size: 1.4rem;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: transform 0.15s, opacity 0.15s;
}

.call-btn:hover {
  transform: scale(1.08);
}

.call-btn.accept {
  background-color: #34C759;
  color: white;
}

.call-btn.reject {
  background-color: #FF3B30;
  color: white;
}

/* Stories Section */
.stories-section {
  padding: 12px 16px;
  border-bottom: 1px solid var(--ios-border);
  background: rgba(255, 255, 255, 0.3);
  flex-shrink: 0;
}

.stories-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ios-text-light);
}

#add-story-btn {
  background: none;
  border: none;
  color: var(--ios-blue);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
}

.stories-tray {
  display: flex;
  gap: 12px;
  overflow-x: auto;
  padding-bottom: 4px;
}

.story-item-placeholder {
  font-size: 0.85rem;
  color: var(--ios-text-light);
  padding: 4px 0;
}

.story-bubble-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  cursor: pointer;
  flex-shrink: 0;
}

.story-ring {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  padding: 2px;
  background: linear-gradient(45deg, #f09433, #e6683c, #dc2743, #cc2366, #bc1888);
  display: flex;
  justify-content: center;
  align-items: center;
}

.story-ring-inner {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: white;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
  background-size: cover;
  background-position: center;
  color: var(--ios-text-dark);
  font-weight: 700;
  font-size: 0.95rem;
}

.story-username {
  font-size: 0.75rem;
  color: var(--ios-text-dark);
  max-width: 60px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Story Modal */
.story-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(25px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 3000;
}

.story-viewer-card {
  position: relative;
  width: 100%;
  max-width: 400px;
  height: 80vh;
  background: #111;
  border-radius: 20px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
}

.story-progress-bar {
  width: 100%;
  height: 3px;
  background: rgba(255, 255, 255, 0.3);
  position: absolute;
  top: 0;
  left: 0;
  z-index: 10;
}

.progress-fill {
  height: 100%;
  background: white;
  width: 0%;
  transition: width linear;
}

.story-header {
  padding: 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 5;
  background: linear-gradient(to bottom, rgba(0,0,0,0.7), transparent);
}

.story-content {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.story-content img, .story-content video {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.story-caption {
  padding: 16px;
  text-align: center;
  color: white;
  background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
  font-size: 1.05rem;
  z-index: 5;
}

/* Delete Message Action */
.delete-msg-btn {
  background: none;
  border: none;
  color: var(--ios-text-light);
  font-size: 0.85rem;
  cursor: pointer;
  margin-left: 8px;
  opacity: 0.6;
  transition: opacity 0.15s;
}

.delete-msg-btn:hover {
  opacity: 1;
  color: #FF3B30;
}