/* ═══ StoryForge — 匹配 frost 设计系统 ═══ */

/* Root — 全屏覆盖层 */
.sf-root {
  position: fixed; inset: 0; z-index: 200;
  display: flex; isolation: isolate;
  background: var(--bg, #f4f4f0);
  font-family: var(--sans, "Noto Sans SC", "PingFang SC", sans-serif);
  color: var(--ink, #5b544a);
  padding-top: env(safe-area-inset-top);
  padding-bottom: env(safe-area-inset-bottom);
}
.sf-root::before {
  content: ""; position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(120% 80% at 84% 2%, rgba(234,188,202,.4), transparent 58%),
    radial-gradient(118% 78% at 4% 20%, rgba(158,202,220,.55), transparent 56%),
    radial-gradient(128% 88% at 52% 108%, rgba(198,190,228,.4), transparent 58%),
    radial-gradient(90% 70% at 92% 62%, rgba(170,206,216,.32), transparent 55%),
    radial-gradient(82% 64% at 12% 72%, rgba(196,210,150,.36), transparent 55%);
}
.sf-root::after {
  content: ""; position: absolute; inset: 0; z-index: 1; pointer-events: none;
  opacity: .045; mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ── Sidebar ── */
.sf-sidebar {
  width: 280px; max-width: 85vw;
  background: var(--glass-2, rgba(255,255,255,.49));
  backdrop-filter: var(--card-blur, blur(24px) saturate(1.5));
  -webkit-backdrop-filter: var(--card-blur, blur(24px) saturate(1.5));
  border-right: var(--card-bd, .5px solid rgba(255,255,255,.58));
  display: flex; flex-direction: column;
  transition: transform .28s cubic-bezier(.4,0,.2,1);
  position: relative; z-index: 10;
}
.sf-sidebar:not(.open) {
  transform: translateX(-100%);
  position: absolute; height: 100%;
  pointer-events: none;
}
.sf-sidebar.open { transform: none; pointer-events: auto; }

.sf-sidebar-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 18px 16px 14px;
  border-bottom: .5px solid rgba(0,0,0,.06);
}
.sf-sidebar-header h3 {
  margin: 0; font-family: var(--serif, "Noto Serif SC", serif);
  font-size: 17px; font-weight: 300; letter-spacing: .5px;
}

.sf-story-list { flex: 1; overflow-y: auto; padding: 8px; -webkit-overflow-scrolling: touch; }

.sf-story-item {
  padding: 12px 14px; border-radius: var(--r-md, 14px);
  cursor: pointer; position: relative; margin-bottom: 4px;
  transition: background .15s;
}
.sf-story-item:active { background: var(--glass-1, rgba(255,255,255,.26)); }
.sf-story-item.active {
  background: var(--bao, #5a5248); color: var(--bao-ink, #e6d6bc);
}
.sf-story-item.active .sf-story-meta { color: rgba(230,214,188,.6); }

.sf-story-title {
  font-size: 14px; font-weight: 400;
  display: flex; align-items: center; gap: 6px;
}
.sf-story-meta { font-size: 11px; color: var(--muted, #9a9183); margin-top: 3px; }

.sf-branch-tag {
  font-size: 10px; background: var(--n-lav, #bcb6cc); color: #fff;
  padding: 1px 7px; border-radius: 8px;
}
.sf-story-item.active .sf-branch-tag { background: rgba(255,255,255,.2); }

.sf-close-sidebar {
  padding: 16px; border: none; background: none; text-align: left;
  font-family: var(--sans, sans-serif); font-size: 14px;
  color: var(--soft, #cda3a8); cursor: pointer;
  border-top: .5px solid rgba(0,0,0,.06);
}

.sf-btn-del {
  position: absolute; right: 8px; top: 50%; transform: translateY(-50%);
  background: none; border: none; color: var(--faint, #b4aa9a);
  cursor: pointer; font-size: 16px; opacity: 0; transition: opacity .15s;
}
.sf-story-item:active .sf-btn-del { opacity: 1; }
.sf-char-card .sf-btn-del { position: static; transform: none; opacity: 1; }

/* ── Main ── */
.sf-main { flex: 1; display: flex; flex-direction: column; min-width: 0; position: relative; z-index: 2; }

.sf-welcome {
  flex: 1; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 20px; padding: 40px 24px;
}
.sf-welcome h2 {
  font-family: var(--serif, "Noto Serif SC", serif);
  font-size: 26px; font-weight: 200; margin: 0; letter-spacing: 1px;
}
.sf-welcome p { color: var(--muted, #9a9183); margin: 0; font-size: 14px; line-height: 1.6; }

.sf-toggle-sidebar {
  background: none; border: none; font-size: 20px; cursor: pointer;
  padding: 6px 10px; color: var(--ink, #5b544a);
}

/* ── Chat header ── */
.sf-chat-header {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 16px;
  border-bottom: .5px solid rgba(0,0,0,.06);
  background: var(--glass-2, rgba(255,255,255,.49));
  backdrop-filter: var(--card-blur, blur(24px) saturate(1.5));
  -webkit-backdrop-filter: var(--card-blur, blur(24px) saturate(1.5));
}
.sf-chat-header h3 {
  flex: 1; margin: 0;
  font-family: var(--serif, "Noto Serif SC", serif);
  font-size: 15px; font-weight: 300;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}

/* ── Chat body ── */
.sf-chat-body {
  flex: 1; overflow-y: auto; padding: 16px;
  display: flex; flex-direction: column; gap: 14px;
  -webkit-overflow-scrolling: touch;
}

.sf-msg {
  max-width: 82%; padding: 14px 18px;
  border-radius: var(--r-lg, 24px); line-height: 1.75;
  font-size: 15px; position: relative;
}
.sf-msg-user {
  align-self: flex-end;
  background: var(--me-bg, rgba(216,172,180,.26));
  color: var(--ink, #5b544a);
  border-bottom-right-radius: var(--r-sm, 4px);
}
.sf-msg-assistant {
  align-self: flex-start;
  background: var(--glass-1, rgba(255,255,255,.26));
  backdrop-filter: var(--card-blur, blur(24px) saturate(1.5));
  -webkit-backdrop-filter: var(--card-blur, blur(24px) saturate(1.5));
  border: var(--card-bd, .5px solid rgba(255,255,255,.58));
  border-bottom-left-radius: var(--r-sm, 4px);
  max-width: 90%; box-shadow: var(--card-sh);
}

.sf-msg-content { word-break: break-word; }
.sf-msg-content p { margin: 0 0 8px; }
.sf-msg-content p:last-child { margin: 0; }

.sf-msg-actions { display: flex; gap: 6px; margin-top: 8px; }
.sf-msg-actions button {
  background: none; border: .5px solid rgba(0,0,0,.1);
  border-radius: 8px; padding: 3px 10px; font-size: 13px;
  cursor: pointer; color: var(--muted, #9a9183); transition: all .15s;
}
.sf-msg-actions button:active {
  border-color: var(--soft, #cda3a8); color: var(--soft, #cda3a8);
}

.sf-typing {
  align-self: flex-start; color: var(--muted, #9a9183);
  font-style: italic; font-size: 14px;
  animation: sf-pulse 1.5s ease infinite;
}
@keyframes sf-pulse { 0%,100% { opacity:.4 } 50% { opacity:1 } }

/* ── Input ── */
.sf-input-bar {
  display: flex; gap: 8px;
  padding: 12px 16px calc(12px + env(safe-area-inset-bottom));
  border-top: .5px solid rgba(0,0,0,.06);
  background: var(--glass-2, rgba(255,255,255,.49));
  backdrop-filter: var(--card-blur, blur(24px) saturate(1.5));
  -webkit-backdrop-filter: var(--card-blur, blur(24px) saturate(1.5));
  align-items: flex-end;
}
.sf-input-bar textarea {
  flex: 1; border: var(--card-bd, .5px solid rgba(255,255,255,.58));
  border-radius: var(--r-md, 14px); padding: 10px 14px;
  font-size: 15px; resize: none;
  background: var(--glass-1, rgba(255,255,255,.26));
  font-family: var(--sans, sans-serif); line-height: 1.5;
  color: var(--ink, #5b544a);
}
.sf-input-bar textarea:focus { outline: none; border-color: var(--soft, #cda3a8); }
.sf-input-bar button { padding: 10px 20px; border-radius: 999px; font-size: 14px; white-space: nowrap; }

/* ── Editor ── */
.sf-editor {
  padding: 24px 20px calc(20px + env(safe-area-inset-bottom));
  max-width: 600px; margin: 0 auto; overflow-y: auto; flex: 1;
  -webkit-overflow-scrolling: touch;
}
.sf-editor h3 {
  margin: 0 0 20px;
  font-family: var(--serif, "Noto Serif SC", serif);
  font-size: 20px; font-weight: 200;
}

.sf-field { display: flex; flex-direction: column; gap: 5px; margin-bottom: 14px; }
.sf-field span { font-size: 12px; color: var(--muted, #9a9183); letter-spacing: .3px; }
.sf-field input, .sf-field textarea, .sf-field select {
  border: var(--card-bd, .5px solid rgba(255,255,255,.58));
  border-radius: var(--r-md, 14px); padding: 12px 14px;
  font-size: 14px; background: var(--glass-1, rgba(255,255,255,.26));
  font-family: var(--sans, sans-serif); color: var(--ink, #5b544a);
}
.sf-field input:focus, .sf-field textarea:focus { outline: none; border-color: var(--soft, #cda3a8); }

.sf-chars-header { display: flex; justify-content: space-between; align-items: center; margin: 20px 0 10px; }
.sf-chars-header h4 {
  margin: 0; font-family: var(--serif, "Noto Serif SC", serif);
  font-size: 15px; font-weight: 300;
}

.sf-char-card {
  background: var(--glass-1, rgba(255,255,255,.26));
  border: var(--card-bd, .5px solid rgba(255,255,255,.58));
  border-radius: var(--r-md, 14px); padding: 14px;
  margin-bottom: 10px; display: flex; flex-direction: column; gap: 8px;
  box-shadow: var(--card-sh);
}
.sf-char-top { display: flex; gap: 8px; align-items: center; }
.sf-char-name { flex: 1; font-weight: 500; }
.sf-char-card input, .sf-char-card select {
  border: .5px solid rgba(0,0,0,.06); border-radius: 10px;
  padding: 8px 12px; font-size: 13px;
  background: var(--glass-1, rgba(255,255,255,.26));
  color: var(--ink, #5b544a);
}

.sf-actions { display: flex; gap: 10px; justify-content: flex-end; margin-top: 20px; }

.sf-btn-sm {
  background: none; border: .5px solid rgba(0,0,0,.1);
  border-radius: 999px; padding: 6px 14px;
  font-size: 13px; cursor: pointer;
  color: var(--soft, #cda3a8); transition: all .15s;
  font-family: var(--sans, sans-serif);
}
.sf-btn-sm:active { background: var(--soft, #cda3a8); color: #fff; }

/* ── Context menu ── */
.sf-context-overlay { position: fixed; inset: 0; z-index: 300; }
.sf-context-menu {
  position: fixed; z-index: 301;
  background: var(--glass-4, rgba(255,255,255,.94));
  backdrop-filter: blur(24px) saturate(1.5);
  -webkit-backdrop-filter: blur(24px) saturate(1.5);
  border: var(--card-bd); border-radius: var(--r-md, 14px);
  padding: 6px; box-shadow: var(--card-sh); min-width: 150px;
}
.sf-context-menu button {
  display: block; width: 100%; text-align: left;
  padding: 10px 14px; border: none; background: none;
  font-size: 14px; border-radius: 10px; cursor: pointer;
  color: var(--ink, #5b544a); font-family: var(--sans, sans-serif);
}
.sf-context-menu button:active { background: var(--glass-1); }

/* ── Notice ── */
.sf-notice {
  position: fixed; top: calc(20px + env(safe-area-inset-top));
  left: 50%; transform: translateX(-50%); z-index: 400;
  background: var(--bao, #5a5248); color: var(--bao-ink, #e6d6bc);
  padding: 8px 24px; border-radius: 999px;
  font-size: 14px; box-shadow: 0 4px 16px rgba(0,0,0,.12);
  animation: sf-fadein .25s;
}
@keyframes sf-fadein { from { opacity: 0; transform: translateX(-50%) translateY(-8px); } }

.sf-empty { color: var(--muted, #9a9183); text-align: center; padding: 60px 20px; font-size: 14px; line-height: 1.8; }

/* ── Mobile backdrop ── */
.sf-backdrop {
  display: none; position: fixed; inset: 0; z-index: 5;
  background: rgba(0,0,0,.25);
}

/* ── Mobile ── */
@media (max-width: 640px) {
  .sf-sidebar { position: absolute; width: 85vw; max-width: 320px; height: 100%; z-index: 10; box-shadow: 4px 0 20px rgba(0,0,0,.08); }
  .sf-sidebar:not(.open) { transform: translateX(-100%); pointer-events: none; }
  .sf-sidebar.open ~ .sf-backdrop { display: block; }
  .sf-msg { max-width: 92%; }
  .sf-msg-assistant { max-width: 96%; }
  .sf-editor { padding: 16px 16px calc(16px + env(safe-area-inset-bottom)); }
}

/* ── Dark mode ── */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .sf-root { background: var(--bg, #1c1b19); color: var(--ink, #d4cdc0); }
  :root:not([data-theme="light"]) .sf-root::before { opacity: .15; }
  :root:not([data-theme="light"]) .sf-field input,
  :root:not([data-theme="light"]) .sf-field textarea,
  :root:not([data-theme="light"]) .sf-field select,
  :root:not([data-theme="light"]) .sf-char-card input,
  :root:not([data-theme="light"]) .sf-char-card select,
  :root:not([data-theme="light"]) .sf-input-bar textarea {
    background: rgba(255,255,255,.06); color: #d4cdc0; border-color: rgba(255,255,255,.1);
  }
  :root:not([data-theme="light"]) .sf-context-menu { background: rgba(30,28,26,.95); }
}
:root[data-theme="dark"] .sf-root { background: var(--bg, #1c1b19); color: var(--ink, #d4cdc0); }
:root[data-theme="dark"] .sf-root::before { opacity: .15; }
:root[data-theme="dark"] .sf-field input,
:root[data-theme="dark"] .sf-field textarea,
:root[data-theme="dark"] .sf-field select,
:root[data-theme="dark"] .sf-char-card input,
:root[data-theme="dark"] .sf-char-card select,
:root[data-theme="dark"] .sf-input-bar textarea {
  background: rgba(255,255,255,.06); color: #d4cdc0; border-color: rgba(255,255,255,.1);
}
:root[data-theme="dark"] .sf-context-menu { background: rgba(30,28,26,.95); }


/* --- Branch tree --- */
.sf-tree-toggle {
  background: none; border: none; padding: 0; margin: 0;
  width: 16px; height: 16px; flex: 0 0 auto;
  font-size: 12px; line-height: 1; cursor: pointer;
  color: var(--muted, #9a9183);
  display: inline-flex; align-items: center; justify-content: center;
}
.sf-tree-node { position: relative; }