/* ArsipBelajar components and layout */
.app-layout { display: flex; flex-direction: column; min-height: 100vh; }

/* Android Bottom Bar & Desktop Sidebar */
.app-nav {
  position: fixed; bottom: 0; left: 0; right: 0; display: flex;
  justify-content: space-around; align-items: center;
  background: var(--surface);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--border);
  padding: 8px 16px max(10px, env(safe-area-inset-bottom)) 16px;
  z-index: 100; box-shadow: 0 -4px 20px rgba(15, 23, 42, 0.05);
}
/* Navigation */
.nav-brand, .nav-section-label, .nav-promo { display: none; }
.mobile-brand-link { display: flex; align-items: center; width: fit-content; min-height: 44px; margin: 0 0 2px; }
.nav-brand-logo { display: block; width: auto; max-width: 100%; height: 40px; }
.nav-links { display: flex; width: 100%; justify-content: space-around; list-style: none; gap: 8px; }
.nav-item { flex: 1; max-width: 120px; min-width: 0; }
.nav-link {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 4px; min-height: var(--min-touch-target); padding: 6px 8px;
  border-radius: var(--radius-sm); color: var(--text-muted); font-size: 0.78rem; font-weight: 600;
  text-decoration: none; white-space: nowrap; transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}
.nav-link:hover { color: var(--text); background: var(--surface-hover); text-decoration: none; }
.nav-link.active { color: var(--primary); background: var(--primary-light); border: 1px solid var(--primary-border); }
.nav-icon { width: 22px; height: 22px; display: inline-block; }

/* Main Content Area */
.app-main { display: flex; flex-direction: column; gap: 14px; flex: 1; padding: 16px 16px calc(88px + env(safe-area-inset-bottom)) 16px; max-width: 780px; width: 100%; margin: 0 auto; }
#name-onboarding-root { width: 100%; }
.user-greeting {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 12px 14px; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface);
}
.user-greeting-title { min-width: 0; overflow-wrap: anywhere; color: var(--text); font-size: 1.15rem; font-weight: 800; }
.user-greeting-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.name-onboarding-dialog {
  width: min(94vw, 440px); max-width: none; max-height: 90vh; margin: auto;
  padding: 22px; overflow-y: auto; color: var(--text); background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius);
}
.name-onboarding-dialog:not([open]) { display: none; }
.name-onboarding-dialog::backdrop { background: rgba(15, 23, 42, 0.62); }
.name-onboarding-form { display: flex; flex-direction: column; gap: 10px; margin-top: 12px; }
.name-onboarding-error { min-height: 1.4em; color: var(--danger); font-size: 0.85rem; }
.name-onboarding-actions { display: flex; flex-wrap: wrap; align-items: center; justify-content: flex-end; gap: 8px; }
.name-onboarding-actions .btn { min-height: 44px; }
.name-onboarding-actions .btn-secondary { min-height: 38px; }
.view-container { display: flex; flex-direction: column; gap: 18px; }
.view-header { display: flex; flex-direction: column; gap: 6px; }
.view-title { font-size: 1.6rem; font-weight: 800; letter-spacing: -0.02em; color: var(--text); }
.view-subtitle { font-size: 0.92rem; color: var(--text-muted); line-height: 1.45; }
.btn-back {
  display: inline-flex; align-items: center; gap: 6px; font-size: 0.85rem; font-weight: 600;
  color: var(--primary); background: var(--primary-light); border: 1px solid var(--primary-border);
  padding: 6px 14px; border-radius: 9999px; margin-bottom: 6px; width: fit-content;
}
.btn-back:hover { text-decoration: none; background: var(--primary-border); }

/* Buttons with Soft Android Touch Feedback */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 18px; border-radius: var(--radius); font-weight: 700;
  font-size: 0.92rem; transition: all 0.15s ease;
  min-height: var(--min-touch-target); text-decoration: none; cursor: pointer;
  box-shadow: var(--shadow-sm);
}
.btn:active { transform: scale(0.97); }
.btn-primary { background: #0c4a6e; color: #fff; box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: #083c5a; text-decoration: none; }
.btn-secondary { background: var(--surface); color: var(--text); border: 1.5px solid var(--border); }
.btn-secondary:hover { background: var(--surface-hover); text-decoration: none; }
.btn-danger { background: var(--pastel-pink); color: var(--pastel-pink-text); border: 1.5px solid var(--pastel-pink-border); }
.btn-danger:hover { background: var(--danger); color: #fff; }
:root[data-theme="dark"] .btn-danger:hover { color: #451a1a; }
.btn-sm { min-height: 38px; padding: 7px 14px; font-size: 0.82rem; border-radius: var(--radius-sm); }
.btn-block { width: 100%; }

/* Package Card (Seaside Pastel Elevation) */
.package-list { display: flex; flex-direction: column; gap: 14px; }
.card {
  background: var(--surface); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border: 1.5px solid var(--border); border-radius: var(--radius);
  padding: 18px; box-shadow: var(--shadow); display: flex; flex-direction: column; gap: 14px;
  position: relative; overflow: hidden; transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.card::before { content: none; }
.card:hover { border-color: var(--primary-border); transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.card-header { display: flex; justify-content: space-between; align-items: flex-start; gap: 8px; }
.card-title { font-size: 1.15rem; font-weight: 700; color: var(--text); letter-spacing: -0.01em; margin: 0; }
.card-meta { display: flex; flex-wrap: wrap; gap: 8px; font-size: 0.8rem; }
.badge { display: inline-flex; align-items: center; gap: 4px; padding: 4px 10px; border-radius: 9999px; font-size: 0.76rem; font-weight: 700; background: var(--pastel-sky); color: var(--pastel-sky-text); border: 1px solid var(--pastel-sky-border); }
.badge-blue { background: var(--pastel-sky); color: var(--pastel-sky-text); border: 1px solid var(--pastel-sky-border); }
.badge-green { background: var(--pastel-mint); color: var(--pastel-mint-text); border: 1px solid var(--pastel-mint-border); }
.badge-warning { background: var(--pastel-sand); color: var(--pastel-sand-text); border: 1px solid var(--pastel-sand-border); }
.card-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 4px; }

/* Empty State */
.empty-state {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; padding: 48px 18px; gap: 12px; background: var(--surface);
  border: 2px dashed var(--pastel-lavender-border); border-radius: var(--radius-lg); margin-top: 8px; box-shadow: var(--shadow-sm);
}
.empty-icon { width: 64px; height: 64px; color: var(--primary); opacity: 0.85; }
.empty-title { font-size: 1.25rem; font-weight: 800; color: var(--text); }
.empty-desc { font-size: 0.9rem; color: var(--text-muted); max-width: 400px; line-height: 1.5; }

/* Form Styles */
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-label { font-size: 0.88rem; font-weight: 700; color: var(--text); }
.form-input, .form-textarea, .form-select {
  width: 100%; padding: 12px 16px; border-radius: var(--radius-sm);
  border: 1.5px solid var(--border); background: var(--surface); color: var(--text);
  font-size: 0.92rem; transition: all 0.15s ease;
}
.form-input:focus, .form-textarea:focus, .form-select:focus {
  border-color: var(--primary); outline: none; box-shadow: 0 0 0 4px var(--primary-light);
}
.form-textarea { resize: vertical; min-height: 120px; font-family: inherit; }
.form-hint { font-size: 0.8rem; color: var(--text-muted); }
.char-count { font-size: 0.78rem; color: var(--text-muted); text-align: right; }

.checkbox-group { display: flex; flex-wrap: wrap; gap: 10px; }
.checkbox-item {
  display: inline-flex; align-items: center; gap: 8px; font-size: 0.86rem; font-weight: 600;
  padding: 8px 14px; background: var(--surface); border: 1.5px solid var(--border); border-radius: var(--radius-sm); cursor: pointer;
}
.checkbox-item input[type="checkbox"] { width: 18px; height: 18px; accent-color: var(--primary); cursor: pointer; }

.video-list { display: flex; flex-direction: column; gap: 8px; }
.video-row { display: flex; gap: 8px; align-items: center; }
.video-input { flex: 3; }
.duration-input { flex: 1.2; min-width: 90px; }

/* Alerts */
.alert {
  padding: 12px 16px; border-radius: var(--radius-sm); font-size: 0.88rem; font-weight: 600;
  display: flex; align-items: flex-start; gap: 10px; line-height: 1.45;
}
.alert-warning { background: var(--pastel-honey); color: var(--pastel-honey-text); border: 1px solid var(--pastel-honey-border); }
.alert-danger { background: var(--pastel-coral); color: var(--pastel-coral-text); border: 1px solid var(--pastel-coral-border); }
.alert-success { background: var(--pastel-mint); color: var(--pastel-mint-text); border: 1px solid var(--pastel-mint-border); }

/* Tabs & Detail Views */
.tabs-header { display: flex; border-bottom: 2px solid var(--border); gap: 6px; overflow-x: auto; scrollbar-width: none; }
.tabs-header::-webkit-scrollbar { display: none; }
.tab-btn {
  padding: 12px 18px; font-size: 0.92rem; font-weight: 700; color: var(--text-muted);
  border-bottom: 3px solid transparent; border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  transition: all 0.15s ease; white-space: nowrap;
}
.tab-btn:hover { color: var(--text); background: var(--surface-hover); }
.tab-btn.active { color: var(--primary); border-bottom-color: var(--primary); background: var(--surface); }
.tab-content { padding-top: 18px; display: flex; flex-direction: column; gap: 16px; }

.section-box {
  background: var(--surface); border: 1.5px solid var(--border);
  border-radius: var(--radius); padding: 18px; display: flex; flex-direction: column; gap: 12px; box-shadow: var(--shadow-sm);
}
.section-title { font-size: 1.05rem; font-weight: 800; color: var(--text); }
.settings-storage-note { border-color: var(--pastel-sand-border); background: var(--pastel-sand); color: var(--text); }
.settings-gemini-recommendation { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 16px; border-color: var(--pastel-sky-border); background: var(--pastel-sky); }
.settings-gemini-actions .btn { min-height: 44px; }
.settings-gemini-actions .btn-primary { background: #0c4a6e; color: #fff; box-shadow: none; }
.settings-about-links a { color: var(--primary-hover); }
.settings-about-links a:hover { color: var(--primary); }
:root[data-theme="dark"] .settings-gemini-actions .btn-primary { color: #fff; }
.settings-gemini-recommendation p, .settings-about p { color: var(--text-muted); font-size: 0.88rem; line-height: 1.55; }
.settings-gemini-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.settings-about { margin-top: 8px; }
.settings-about-developer { display: flex; flex-direction: column; gap: 2px; }
.settings-about-developer strong { color: var(--text); }
.settings-about-links { display: flex; flex-wrap: wrap; gap: 8px 18px; }
.settings-about-links a { min-height: 44px; display: inline-flex; align-items: center; font-weight: 700; }
.settings-about-links .settings-social-icon { width: 44px; justify-content: center; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface); }
.settings-social-icon svg { width: 22px; height: 22px; }
.settings-about-links .settings-social-icon:hover { background: var(--surface-hover); }
.settings-portfolio-link { align-self: flex-start; min-height: 44px; background: #0c4a6e; color: #fff; box-shadow: none; }
:root[data-theme="dark"] .settings-portfolio-link { color: #fff; }
.settings-about-copyright { margin-top: -6px; }
.account-settings-actions, .friends-page-heading, .friend-actions, .share-link-controls {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
}
.account-settings-actions .form-input { flex: 1 1 220px; min-width: 0; }
.account-settings-actions button, .account-settings-actions a,
.friends-page-heading button, .friend-actions button,
.friends-message-form button, .friends-share-form button { min-height: 44px; }
.friends-page-heading { justify-content: space-between; align-items: flex-start; }
.friends-layout { display: grid; grid-template-columns: minmax(230px, 0.8fr) minmax(0, 1.4fr); gap: 16px; align-items: start; }
.friends-column, .friends-chat-panel { min-width: 0; }
.friends-column .section-box { min-width: 0; }
.friends-add-form, .friends-share-form { display: flex; flex-wrap: wrap; gap: 8px; }
.friends-add-form .form-input, .friends-share-form .form-select { flex: 1 1 180px; min-width: 0; }
.friends-group { display: flex; flex-direction: column; gap: 8px; }
.friends-group h3 { color: var(--text-muted); font-size: 0.85rem; }
.friend-row {
  display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 8px;
  min-width: 0; padding: 8px 0; border-top: 1px solid var(--border);
}
.friend-row.is-active { color: var(--primary); }
.friend-name { min-width: 0; overflow-wrap: anywhere; font-weight: 700; }
.friend-pending { color: var(--text-muted); overflow-wrap: anywhere; }
.friends-empty, .friends-chat-empty { color: var(--text-muted); font-size: 0.9rem; line-height: 1.5; }
.friends-chat-panel { min-height: 360px; }
.friends-chat-header { min-width: 0; }
.friends-messages {
  display: flex; flex-direction: column; gap: 8px; min-height: 220px; max-height: 52vh; overflow-y: auto;
  padding: 12px; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface-hover);
}
.friends-message {
  display: flex; flex-direction: column; gap: 4px; align-self: flex-start; max-width: min(88%, 38rem);
  min-width: 0; padding: 9px 12px; border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--surface); overflow-wrap: anywhere;
}
.friends-message.is-mine { align-self: flex-end; background: var(--primary-light); }
.friends-message p { white-space: pre-wrap; }
.friends-message time { color: var(--text-muted); font-size: 0.72rem; }
.friends-archive-link { min-height: 44px; display: inline-flex; align-items: center; overflow-wrap: anywhere; font-weight: 700; }
.friends-message-form { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 8px; align-items: end; }
.friends-message-form .form-input { min-width: 0; resize: vertical; }
.friends-share-form { padding-top: 8px; border-top: 1px solid var(--border); }
.share-link-box { display: grid; gap: 8px; margin-top: 12px; padding: 12px; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface); }
.share-link-controls .form-input { flex: 1 1 220px; min-width: 0; }
.friends-invite-box {
  display: grid; gap: 8px; margin-bottom: 14px; padding: 12px;
  border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface-hover);
}
.friends-search-box { margin-bottom: 12px; }
.friends-search-box .form-input { width: 100%; min-height: 40px; }
.friends-incoming-card {
  display: flex; flex-direction: column; gap: 8px; margin-bottom: 16px; padding: 14px;
  border: 1px solid var(--primary-border); border-radius: var(--radius-sm); background: var(--primary-light);
}
.friends-incoming-card button { align-self: flex-start; }
/* Auth Gate & Google Sign In */
.auth-gate-card {
  display: flex; flex-direction: column; gap: 14px; padding: 20px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-md);
}
.auth-tabs {
  display: flex; gap: 8px; border-bottom: 1px solid var(--border); padding-bottom: 6px; margin-bottom: 4px;
}
.auth-tab-btn {
  background: none; border: none; font-size: 0.95rem; font-weight: 700; padding: 6px 14px;
  color: var(--text-muted); cursor: pointer; border-radius: var(--radius-sm); transition: all 0.2s ease;
}
.auth-tab-btn.active {
  background: var(--primary-light); color: var(--primary);
}
.auth-form {
  display: flex; flex-direction: column; gap: 10px;
}
.auth-form .form-input {
  min-height: 44px;
}
.auth-switch-link {
  background: none; border: none; padding: 4px 0; color: var(--primary); font-size: 0.85rem;
  font-weight: 600; cursor: pointer; text-decoration: underline; text-align: left; width: fit-content;
}
.auth-switch-link:hover {
  text-decoration: none;
}
.btn-google {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 44px; padding: 10px 18px; border: 1px solid var(--border);
  border-radius: var(--radius-sm); background: var(--surface); color: var(--text);
  font-weight: 600; font-size: 0.95rem; cursor: pointer; transition: all 0.2s ease;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}
.btn-google:hover { background: var(--surface-hover); border-color: var(--primary-border); }
:root[data-theme="dark"] .btn-google { background: var(--surface-hover); border-color: var(--border); color: #fff; }
.auth-divider {
  display: flex; align-items: center; text-align: center; color: var(--text-muted); font-size: 0.8rem; margin: 4px 0;
}
.auth-divider::before, .auth-divider::after {
  content: ''; flex: 1; border-bottom: 1px solid var(--border);
}
.auth-divider span { padding: 0 10px; }
.auth-locked-notice {
  display: flex; align-items: center; gap: 10px; padding: 12px 16px;
  background: var(--surface-hover); border: 1px dashed var(--border); border-radius: var(--radius-sm);
  color: var(--text-muted); font-size: 0.9rem; margin-top: 12px;
}

/* User & Academic Profile */
.profile-settings-card {
  display: flex; flex-direction: column; gap: 16px; padding: 22px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}
.profile-card-header {
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 14px;
}
.profile-avatar-display {
  width: 58px; height: 58px; border-radius: 50%;
  background: linear-gradient(135deg, #0284c7, #0c4a6e); color: #fff;
  font-size: 1.5rem; font-weight: 700; display: flex; align-items: center;
  justify-content: center; overflow: hidden; flex-shrink: 0;
  border: 2px solid var(--primary-border); box-shadow: 0 2px 6px rgba(0,0,0,0.08);
}
.profile-avatar-display img {
  width: 100%; height: 100%; object-fit: cover;
}
.profile-avatar-custom-row {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-top: 6px;
}
.profile-upload-label {
  cursor: pointer; display: inline-flex; align-items: center; gap: 8px;
  min-height: 40px; padding: 6px 14px; font-weight: 600;
}
.profile-avatar-options {
  display: flex; gap: 8px; flex-wrap: wrap; align-items: center; margin-top: 4px;
}
.profile-avatar-btn {
  width: 44px; height: 44px; border-radius: 50%; border: 2px solid var(--border);
  background: var(--surface); font-size: 1.25rem; cursor: pointer;
  display: flex; align-items: center; justify-content: center; transition: all 0.2s ease;
}
.profile-avatar-btn:hover, .profile-avatar-btn.active {
  border-color: var(--primary); transform: scale(1.1); background: var(--primary-light);
}
.profile-status-badge {
  font-size: 0.8rem; font-weight: 700; padding: 4px 10px; border-radius: 20px;
  background: var(--primary-light); color: var(--primary);
}
.friend-avatar-thumb {
  width: 38px; height: 38px; border-radius: 50%;
  background: linear-gradient(135deg, #0284c7, #0c4a6e); color: #fff;
  font-size: 1rem; font-weight: 700; display: inline-flex; align-items: center;
  justify-content: center; overflow: hidden; flex-shrink: 0;
  border: 1.5px solid var(--primary-border);
}
.friend-avatar-thumb img {
  width: 100%; height: 100%; object-fit: cover;
}
.bullet-list { padding-left: 20px; display: flex; flex-direction: column; gap: 10px; line-height: 1.55; }
.term-card {
  background: var(--surface-hover); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 12px 14px; display: flex; flex-direction: column; gap: 4px;
}
.term-name { font-weight: 800; color: var(--primary); font-size: 0.92rem; }
.term-desc { font-size: 0.88rem; color: var(--text); line-height: 1.45; }

/* Material Q&A */
.material-chat { display: flex; flex-direction: column; gap: 12px; min-width: 0; }
.material-chat-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.material-chat-header > div { min-width: 0; }
.material-chat-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.material-chat-messages {
  display: flex; min-height: 180px; max-height: 48vh; flex-direction: column; gap: 10px;
  overflow-y: auto; padding: 14px; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface);
}
.material-chat-message { max-width: min(88%, 620px); padding: 11px 14px; border: 1px solid var(--border); border-radius: var(--radius-sm); }
.material-chat-message p { white-space: pre-wrap; overflow-wrap: anywhere; line-height: 1.55; }
.material-chat-message-label { display: block; margin-bottom: 4px; color: var(--text-muted); font-size: 0.76rem; font-weight: 700; }
.material-chat-message-user { align-self: flex-end; background: var(--primary-light); border-color: #38bdf8; }
.material-chat-message-assistant { align-self: flex-start; background: var(--surface-hover); }
.material-chat .btn-sm { min-height: 44px; }
.material-chat-status { min-height: 1.4em; color: var(--text-muted); font-size: 0.85rem; }
.material-chat-empty { align-self: center; margin: auto 0; color: var(--text-muted); text-align: center; }
.material-chat-form { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: end; gap: 10px; }
.material-chat-input { min-width: 0; min-height: 88px; resize: vertical; }

/* Flashcard & Quiz Components (Pastel Card Visuals) */
.flashcard-box {
  background: linear-gradient(145deg, var(--surface) 0%, var(--surface-hover) 100%);
  border: 2px solid var(--primary-border); border-radius: var(--radius-lg);
  min-height: 240px; padding: 30px 20px; display: flex; flex-direction: column;
  justify-content: center; align-items: center; text-align: center; cursor: pointer;
  box-shadow: var(--shadow-lg); transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}
.flashcard-box:active { transform: scale(0.98); }
.flashcard-box:hover { border-color: var(--primary); }
.flashcard-text { font-size: 1.3rem; font-weight: 700; line-height: 1.5; color: var(--text); }
.flashcard-hint { font-size: 0.82rem; color: var(--text-muted); margin-top: 14px; font-weight: 600; }

.quiz-options { display: flex; flex-direction: column; gap: 12px; margin-top: 14px; }
.quiz-opt {
  display: flex; align-items: center; gap: 14px; padding: 14px 18px;
  background: var(--surface); border: 1.5px solid var(--border); border-radius: var(--radius);
  font-size: 0.95rem; font-weight: 600; text-align: left; width: 100%; transition: all 0.15s ease; cursor: pointer;
  box-shadow: var(--shadow-sm);
}
.quiz-opt:hover:not(:disabled) { background: var(--surface-hover); border-color: var(--primary); }
.quiz-opt:active:not(:disabled) { transform: scale(0.98); }
.quiz-opt.selected-correct { background: var(--pastel-mint); border-color: var(--pastel-mint-border); color: var(--pastel-mint-text); font-weight: 700; }
.quiz-opt.selected-wrong { background: var(--pastel-coral); border-color: var(--pastel-coral-border); color: var(--pastel-coral-text); font-weight: 700; }
.quiz-opt-letter {
  display: inline-flex; align-items: center; justify-content: center; width: 32px; height: 32px;
  border-radius: 50%; background: var(--surface-hover); font-weight: 800; font-size: 0.88rem; flex-shrink: 0;
  border: 1px solid var(--border);
}
.quiz-explanation {
  background: var(--pastel-lavender); border-left: 4px solid var(--pastel-lavender-text);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0; padding: 14px 18px; font-size: 0.92rem; line-height: 1.5; color: var(--text);
}
.quiz-setup-form { display: grid; gap: 18px; }
.quiz-timer-value-group[hidden] { display: none; }
.quiz-duration-input { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 10px; }
.quiz-duration-input span { min-width: 48px; color: var(--text-muted); font-size: 0.9rem; }
.quiz-setup-actions, .quiz-next-action { display: flex; justify-content: flex-end; flex-wrap: wrap; gap: 10px; }
.quiz-progress-header { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 8px; }
.quiz-timer {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 10px 14px; background: var(--primary-light); border: 1px solid var(--primary-border);
  border-radius: var(--radius-sm); color: var(--text);
}
.quiz-timer strong { font-size: 1.15rem; font-variant-numeric: tabular-nums; color: var(--primary); }
.quiz-timer-urgent { background: var(--pastel-sand); border-color: var(--pastel-sand-border); }
.quiz-timer-urgent strong { color: var(--pastel-sand-text); }

/* Dials ENERGY 2 / RHYTHM 2 / MOTION 1: screenshot-led steps alternate with short guidance so the key actions stay legible. */
.settings-tutorial-link { align-self: flex-start; min-height: 44px; margin-top: 4px; }
.api-tutorial { gap: 22px; }
.api-tutorial-choices { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.api-tutorial-choice {
  display: flex; min-height: 92px; flex-direction: column; justify-content: center; gap: 7px;
  padding: 16px; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface); color: var(--text); cursor: pointer; text-align: left;
  transition: border-color 140ms ease, background-color 140ms ease;
}
.api-tutorial-choice:hover, .api-tutorial-choice:focus-visible, .api-tutorial-choice.active {
  border-color: var(--primary-border); background: var(--primary-light);
}
.api-tutorial-choice:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.api-tutorial-choice strong { font-size: 0.96rem; line-height: 1.35; }
.api-tutorial-choice span { color: var(--text-muted); font-size: 0.82rem; line-height: 1.45; }
.api-tutorial-guide-intro { padding: 20px; border: 1px solid var(--primary-border); border-radius: var(--radius); background: var(--primary-light); }
.api-tutorial-guide-intro h2 { color: var(--text); font-size: 1.15rem; }
.api-tutorial-guide-intro p { margin-top: 8px; color: var(--text-muted); line-height: 1.6; }
/* Expanding a selected guide and scrolling to it keeps the content tied to its choice. */
.api-tutorial-panel {
  display: grid; grid-template-rows: 0fr; min-width: 0; opacity: 0;
  scroll-margin-top: 16px;
  transition: grid-template-rows 260ms ease, opacity 180ms ease;
}
.api-tutorial-panel.is-open { grid-template-rows: 1fr; opacity: 1; }
.api-tutorial-panel-inner { min-height: 0; overflow: hidden; display: flex; flex-direction: column; gap: 16px; }
@media (prefers-reduced-motion: reduce) {
  .api-tutorial-panel { transition: none; }
}
.api-tutorial-provider, .api-tutorial-paste, .api-tutorial-coming {
  display: flex; align-items: center; justify-content: space-between; gap: 18px;
  padding: 20px; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface);
}
.api-tutorial-provider { border-color: var(--primary-border); background: var(--primary-light); }
.api-tutorial-provider h2, .api-tutorial-paste h2, .api-tutorial-coming h2 { font-size: 1.15rem; color: var(--text); }
.api-tutorial-provider p, .api-tutorial-paste p, .api-tutorial-coming p { margin-top: 6px; color: var(--text-muted); line-height: 1.55; }
.api-tutorial-kicker { font-size: 0.72rem; font-weight: 800; letter-spacing: 0.08em; color: var(--primary); }
.api-tutorial-provider .api-tutorial-kicker, .api-tutorial-coming .api-tutorial-kicker { color: var(--primary-hover); }
.api-tutorial-steps { display: flex; flex-direction: column; gap: 16px; list-style: none; }
.api-tutorial-step {
  display: grid; grid-template-columns: minmax(180px, 0.7fr) minmax(0, 1.3fr);
  align-items: center; gap: 20px; padding: 18px; border: 1px solid var(--border);
  border-radius: var(--radius); background: var(--surface);
}
.api-tutorial-step:nth-child(even) .api-tutorial-copy { order: 2; }
.api-tutorial-step:nth-child(even) .api-tutorial-figure { order: 1; }
.api-tutorial-copy { min-width: 0; }
.api-tutorial-number { display: block; margin-bottom: 8px; color: var(--primary); font-size: 0.8rem; font-weight: 800; font-variant-numeric: tabular-nums; }
.api-tutorial-copy h3 { font-size: 1rem; line-height: 1.35; color: var(--text); }
.api-tutorial-copy p { margin-top: 8px; color: var(--text-muted); font-size: 0.88rem; line-height: 1.55; }
.api-tutorial-figure { min-width: 0; margin: 0; }
.api-tutorial-zoom { display: block; width: 100%; padding: 0; border: 0; border-radius: var(--radius-sm); background: transparent; cursor: zoom-in; text-align: left; }
.api-tutorial-figure img { display: block; width: 100%; height: auto; border: 1px solid var(--border); border-radius: var(--radius-sm); }
.api-tutorial-figure figcaption { margin-top: 6px; color: var(--text-muted); font-size: 0.75rem; line-height: 1.4; }
.api-tutorial-dialog { width: min(94vw, 1100px); max-width: none; max-height: 92vh; margin: auto; padding: 14px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); color: var(--text); }
.api-tutorial-dialog::backdrop { background: rgba(2, 6, 23, 0.78); }
.api-tutorial-dialog-content { display: flex; flex-direction: column; align-items: flex-end; gap: 10px; }
.api-tutorial-dialog-content img { display: block; width: 100%; max-height: 82vh; object-fit: contain; }
.api-tutorial-close { min-height: 44px; }
.api-tutorial-paste { align-items: flex-start; }
.api-tutorial-paste .form-hint { max-width: 580px; }

@media (min-width: 560px) {
  .quiz-setup-form { grid-template-columns: repeat(2, minmax(0, 1fr)); align-items: start; }
  .quiz-setup-actions { grid-column: 1 / -1; }
}

@media (max-width: 559px) {
  .user-greeting { align-items: flex-start; flex-direction: column; }
  .user-greeting-actions { width: 100%; }
  .user-greeting-actions .btn { flex: 1; }
  .name-onboarding-dialog { padding: 18px; }
  .name-onboarding-actions { align-items: stretch; flex-direction: column; }
  .name-onboarding-actions .btn-primary { width: 100%; }
  .name-onboarding-actions .btn-secondary { align-self: flex-end; }
  .api-tutorial-choices { grid-template-columns: minmax(0, 1fr); gap: 8px; }
  .api-tutorial-choice { min-height: 76px; }
  .api-tutorial-provider, .api-tutorial-paste { align-items: stretch; flex-direction: column; }
  .settings-gemini-recommendation { grid-template-columns: minmax(0, 1fr); }
  .settings-gemini-actions { flex-direction: column; align-items: stretch; }
  .friends-layout { grid-template-columns: minmax(0, 1fr); }
  .friends-message-form { grid-template-columns: minmax(0, 1fr); }
  .friends-message-form button, .friends-add-form button, .friends-share-form button { width: 100%; }
  .api-tutorial-step { grid-template-columns: minmax(0, 1fr); gap: 12px; padding: 14px; }
  .api-tutorial-step:nth-child(even) .api-tutorial-copy,
  .api-tutorial-step:nth-child(even) .api-tutorial-figure { order: initial; }
  .material-chat-header { flex-direction: column; }
  .material-chat-actions { width: 100%; }
  .material-chat-actions .btn { flex: 1; }
  .material-chat-messages { max-height: 42vh; padding: 10px; }
  .material-chat-message { max-width: 94%; }
  .material-chat-form { grid-template-columns: minmax(0, 1fr); }
  .material-chat-form .btn { width: 100%; }
}

/* Desktop Layout (min-width: 768px) */
@media (min-width: 768px) {
  .mobile-brand-link { display: none; }
  .app-layout { flex-direction: row; }
  .app-nav {
    position: sticky; top: 0; bottom: auto; width: 270px; height: 100vh; min-height: 560px;
    flex: 0 0 270px; flex-direction: column; justify-content: flex-start; align-items: stretch;
    border-top: none; border-right: 1.5px solid var(--border); padding: 28px 18px 22px;
    box-shadow: none; overflow-y: auto; isolation: isolate;
    background: var(--surface);
    backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  }
  .nav-brand { display: block; width: 100%; margin-bottom: 30px; }
  .nav-brand-link { display: flex; align-items: center; color: var(--text); text-decoration: none; }
  .nav-brand-link:hover { text-decoration: none; }
  .nav-brand-logo { display: block; width: auto; max-width: 100%; height: 40px; }
  .nav-section-label { display: block; margin: 0 0 10px 12px; color: var(--text-muted); font-size: 0.68rem; font-weight: 800; letter-spacing: 0.12em; }
  .nav-links { flex-direction: column; justify-content: flex-start; width: 100%; gap: 6px; }
  .nav-item { flex: initial; max-width: none; }
  .nav-link {
    position: relative; flex-direction: row; justify-content: flex-start; gap: 12px;
    min-height: 50px; padding: 11px 14px; font-size: 0.92rem;
  }
  .nav-link.active { border-color: transparent; box-shadow: inset 0 0 0 1px var(--primary-border); }
  .nav-link.active::before { position: absolute; top: 13px; bottom: 13px; left: 0; width: 3px; border-radius: 3px; background: var(--primary); content: ""; }
  .nav-link:hover { transform: translateX(2px); }
  .nav-promo {
    display: block; margin-top: auto; padding: 18px 16px 16px;
    border: 1px solid var(--pastel-sky-border); border-radius: var(--radius);
    background: var(--pastel-sky);
    box-shadow: var(--shadow-sm);
  }
  .nav-promo-kicker { color: var(--primary-hover); font-size: 0.64rem; font-weight: 800; letter-spacing: 0.12em; }
  .nav-promo-title { margin-top: 8px; color: var(--text); font-size: 1rem; font-weight: 800; letter-spacing: -0.02em; }
  .nav-promo-copy { margin-top: 5px; color: var(--text-muted); font-size: 0.78rem; line-height: 1.5; }
  .nav-promo-link {
    display: flex; min-height: 42px; align-items: center; justify-content: space-between; gap: 8px;
    margin-top: 12px; padding: 0 12px; border: 1px solid var(--primary-border); border-radius: var(--radius-sm);
    background: var(--surface); color: var(--primary-hover); font-size: 0.78rem; font-weight: 800;
    text-decoration: none; transition: background 0.2s ease, transform 0.2s ease;
  }
  .nav-promo-link:hover { background: var(--surface-hover); text-decoration: none; transform: translateY(-1px); }
  .nav-promo-link svg { width: 18px; height: 18px; flex: 0 0 18px; }
  .app-main { padding: 40px; max-width: 860px; margin: 0 auto; }
}