/*!
 * style.css — yjt燕理绩点计算通 网页版样式
 * 移动优先，无外部字体 / 图标依赖，保证在备案审核与弱网环境下也能正常渲染。
 */

/* ==================== 基础 ==================== */
*,
*::before,
*::after { box-sizing: border-box; }

:root {
  --brand: #4A90E2;
  --brand-dark: #357ABD;
  --bg: #f5f7fa;
  --card: #ffffff;
  --text: #1f2d3d;
  --muted: #7a8699;
  --line: #e8edf3;
  --green: #52c41a;
  --amber: #faad14;
  --red: #ff4d4f;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(31, 45, 61, .04), 0 8px 24px rgba(31, 45, 61, .05);
}

html, body { margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

button { font: inherit; color: inherit; }

/* ==================== 头部 ==================== */
.app-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, .94);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  max-width: 920px;
  margin: 0 auto;
  padding: 10px 16px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  width: 42px;
  height: 42px;
  flex: 0 0 42px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  font-size: 22px;
  background: linear-gradient(135deg, #eaf3fe, #dbeafe);
}

.brand-text { min-width: 0; }
.brand-text h1 {
  margin: 0;
  font-size: 18px;
  line-height: 1.25;
  letter-spacing: -.2px;
}
.brand-text p {
  margin: 1px 0 0;
  font-size: 12px;
  color: var(--muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tabs {
  display: flex;
  gap: 2px;
  margin-top: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}
.tabs::-webkit-scrollbar { display: none; }

.tab {
  flex: 0 0 auto;
  position: relative;
  border: none;
  background: none;
  padding: 10px 16px 12px;
  font-size: 14px;
  color: #667085;
  cursor: pointer;
  border-radius: 8px 8px 0 0;
}
.tab:hover { color: var(--brand); }
.tab.is-active { color: var(--brand); font-weight: 600; }
.tab.is-active::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 4px;
  height: 3px;
  border-radius: 3px;
  background: var(--brand);
}

/* ==================== 布局 ==================== */
.view {
  max-width: 920px;
  margin: 0 auto;
  padding: 16px;
}

.card {
  background: var(--card);
  border: 1px solid rgba(31, 45, 61, .04);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px 18px;
  margin: 0 0 14px;
}

.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  padding: 0;
  margin: 0 0 8px;
  border: none;
  background: none;
  text-align: left;
  cursor: pointer;
}
.card-head.is-static { cursor: default; }

.card-title { font-size: 15px; font-weight: 600; }

.count {
  display: inline-block;
  min-width: 20px;
  margin-left: 6px;
  padding: 0 6px;
  font-size: 12px;
  font-weight: 600;
  color: var(--brand);
  background: #eef5fe;
  border-radius: 999px;
  text-align: center;
}

.caret { font-size: 12px; color: var(--muted); }

/* 算法下拉的小三角：用边框绘制，避免依赖字体字符 */
.caret-sm {
  display: inline-block;
  width: 0;
  height: 0;
  margin-left: 6px;
  vertical-align: middle;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  opacity: .55;
}

.card-foot {
  padding-top: 10px;
  border-top: 1px solid #f2f5f9;
  margin-top: 4px;
}

/* ==================== 结果卡 ==================== */
.result-card {
  background: linear-gradient(180deg, #ffffff 0%, #f7fbff 100%);
}

.result-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.result-label { margin: 0; font-size: 13px; color: var(--muted); }

.result-value {
  margin: 2px 0 0;
  font-size: 52px;
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -1.5px;
  font-variant-numeric: tabular-nums;
}

.result-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
}

.result-stats > div {
  display: flex;
  flex-direction: column;
  gap: 1px;
  text-align: center;
}

.result-stats .num {
  font-size: 19px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}
.result-stats .lbl { font-size: 12px; color: var(--muted); }

/* ==================== 按钮 ==================== */
.btn,
.btn-sm {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--line);
  background: #fff;
  color: #344054;
  border-radius: 10px;
  padding: 9px 16px;
  font-size: 14px;
  cursor: pointer;
  transition: background .15s, border-color .15s, transform .05s;
}
.btn:hover, .btn-sm:hover { background: #f7f9fc; }
.btn:active, .btn-sm:active { transform: translateY(1px); }

.btn-primary {
  background: linear-gradient(135deg, #4A90E2, #357ABD);
  border-color: transparent;
  color: #fff;
  font-weight: 500;
  box-shadow: 0 2px 8px rgba(74, 144, 226, .3);
}
.btn-primary:hover { background: linear-gradient(135deg, #4189db, #2f6fae); }

.btn-sm { padding: 6px 12px; font-size: 13px; border-radius: 8px; }
.btn-block { width: 100%; justify-content: center; }

.btn-ghost {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 13px;
  color: #475467;
  cursor: pointer;
  white-space: nowrap;
}
.btn-ghost:hover { border-color: #cfd8e3; background: #fbfcfe; }

.btn-icon {
  border: 1px solid transparent;
  background: #f5f7fa;
  color: #475467;
  border-radius: 8px;
  padding: 5px 10px;
  font-size: 12px;
  cursor: pointer;
}
.btn-icon:hover { background: #eef2f7; }
.btn-icon.btn-danger { color: #d92d20; }
.btn-icon.btn-danger:hover { background: #fef3f2; }

.btn-danger-ghost { color: #d92d20; }
.btn-danger-ghost:hover { background: #fef3f2; border-color: #fcd9d6; }

button:disabled {
  opacity: .42;
  cursor: not-allowed;
  box-shadow: none;
}

.ico { font-size: 15px; line-height: 1; }

/* ==================== 学期筛选 & 工具条 ==================== */
.chips {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 2px 2px 10px;
  margin-bottom: 2px;
  scrollbar-width: none;
}
.chips::-webkit-scrollbar { display: none; }

.chip {
  flex: 0 0 auto;
  border: 1px solid var(--line);
  background: #fff;
  color: #475467;
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 13px;
  cursor: pointer;
}
.chip:hover { border-color: #cfd8e3; }
.chip.is-active {
  background: var(--brand);
  border-color: var(--brand);
  color: #fff;
  font-weight: 500;
}

.toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}
.toolbar-right { margin-left: auto; display: flex; gap: 6px; }
.toolbar-left { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 4px; }

/* ==================== 课程列表 ==================== */
.course-list { list-style: none; margin: 0; padding: 0; }

.course {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 0;
  border-top: 1px solid #f2f5f9;
}
.course:first-child { border-top: none; }

.course-main { flex: 1; min-width: 0; }

.course-name {
  margin: 0;
  font-size: 15px;
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.course-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 10px;
  align-items: center;
  margin: 3px 0 0;
  font-size: 12px;
  color: var(--muted);
}
.course-meta b { color: #475467; font-weight: 600; }

.course-gpa {
  min-width: 54px;
  text-align: right;
  font-size: 18px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.course-ops { display: flex; gap: 3px; }

.course.is-excluded .course-name { color: #98a2b3; text-decoration: line-through; }

.tag {
  display: inline-block;
  padding: 0 7px;
  font-size: 11px;
  line-height: 18px;
  color: #475467;
  background: #f2f5f9;
  border-radius: 6px;
}
.tag-soft { color: #7a8699; background: #f7f9fc; }
.tag-brand { color: var(--brand); background: #eef5fe; margin-left: 6px; }

/* ==================== 空状态 ==================== */
.empty { padding: 26px 8px 18px; text-align: center; }
.empty-icon { font-size: 40px; line-height: 1; }
.empty-title { margin: 10px 0 4px; font-size: 15px; font-weight: 600; }
.empty-desc {
  margin: 0 auto 16px;
  max-width: 420px;
  font-size: 13px;
  color: var(--muted);
}
.empty-actions { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; }

/* ==================== 统计 ==================== */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(96px, 1fr));
  gap: 10px;
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 12px 10px;
  text-align: center;
  background: #fbfcfe;
  border: 1px solid #f0f4f9;
  border-radius: 12px;
}
.stat-num {
  font-size: 20px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.stat-lbl { font-size: 12px; color: var(--muted); }

.bars { display: flex; flex-direction: column; gap: 10px; margin-top: 6px; }

.bar-row {
  display: grid;
  grid-template-columns: 112px 1fr 88px;
  align-items: center;
  gap: 10px;
  font-size: 13px;
}
.bar-label { color: #475467; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.bar-track {
  display: block;
  height: 10px;
  background: #eef2f7;
  border-radius: 999px;
  overflow: hidden;
}
.bar-fill {
  display: block;
  height: 100%;
  border-radius: 999px;
  transition: width .35s ease;
}
.bar-value {
  text-align: right;
  font-size: 13px;
  color: #344054;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.bar-value small { color: var(--muted); font-size: 11px; }

/* ==================== 历史 ==================== */
.snapshots { list-style: none; margin: 0; padding: 0; }

.snapshot {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 0;
  border-top: 1px solid #f2f5f9;
}
.snapshot:first-child { border-top: none; }
.snapshot-main { flex: 1; min-width: 0; }
.snapshot-desc { margin: 0; font-size: 14px; }
.snapshot-meta { margin: 2px 0 0; font-size: 12px; color: var(--muted); }
.snapshot.is-current .snapshot-desc { font-weight: 600; }

/* ==================== 关于 / 提示 ==================== */
.plain-list { margin: 0; padding-left: 20px; font-size: 14px; }
.plain-list li { margin: 6px 0; }

.info-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.info-table th,
.info-table td {
  padding: 8px 6px;
  text-align: left;
  border-bottom: 1px solid #f2f5f9;
}
.info-table th { width: 128px; color: var(--muted); font-weight: 500; }

.about-strip p { margin: 0 0 6px; font-size: 13px; color: #475467; }
.about-strip p:last-child { margin-bottom: 0; }

.hint { margin: 8px 0; font-size: 12.5px; color: var(--muted); }
.muted { color: var(--muted); }

.card p { margin: 0 0 8px; }
.card p:last-child { margin-bottom: 0; }

.foot-note {
  margin: 4px 0 0;
  text-align: center;
  font-size: 12px;
  color: var(--muted);
}

/* ==================== 页脚 ==================== */
.app-footer {
  max-width: 920px;
  margin: 0 auto;
  padding: 18px 16px 44px;
  text-align: center;
  font-size: 12px;
  color: var(--muted);
}
.foot-line { margin: 4px 0; }
.foot-muted { color: #98a2b3; }
.sep { margin: 0 6px; color: #d0d7e2; }

/* ==================== 弹窗 ==================== */
.modal-open { overflow: hidden; }

.modal-mask {
  position: fixed;
  inset: 0;
  z-index: 40;
  background: rgba(16, 24, 40, .45);
  animation: fade-in .15s ease;
}

.modal {
  position: fixed;
  z-index: 41;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  width: min(560px, calc(100vw - 28px));
  max-height: calc(100vh - 64px);
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 24px 64px rgba(16, 24, 40, .26);
  animation: pop-in .18s cubic-bezier(.2, .8, .3, 1);
}
.modal-sm { width: min(420px, calc(100vw - 28px)); }

.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 15px 20px;
  border-bottom: 1px solid var(--line);
}
.modal-head h2 { margin: 0; font-size: 16px; font-weight: 600; }

.modal-close {
  border: none;
  background: none;
  padding: 2px 8px;
  font-size: 22px;
  line-height: 1;
  color: var(--muted);
  border-radius: 8px;
  cursor: pointer;
}
.modal-close:hover { background: #f2f5f9; }

.modal-body { padding: 16px 20px; overflow-y: auto; -webkit-overflow-scrolling: touch; }

.modal-foot {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  padding: 12px 20px 16px;
  border-top: 1px solid var(--line);
}

@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }
@keyframes pop-in {
  from { opacity: 0; transform: translate(-50%, -48%) scale(.98); }
  to { opacity: 1; transform: translate(-50%, -50%) scale(1); }
}

/* ==================== 表单 ==================== */
.field { display: block; margin-bottom: 13px; }
.field-label {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
  color: #475467;
}

.input {
  width: 100%;
  padding: 10px 12px;
  font: inherit;
  font-size: 14px;
  color: var(--text);
  background: #fbfcfe;
  border: 1px solid var(--line);
  border-radius: 10px;
  transition: border-color .15s, box-shadow .15s, background .15s;
}
.input:focus {
  outline: none;
  background: #fff;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(74, 144, 226, .15);
}

.textarea {
  min-height: 118px;
  resize: vertical;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12px;
  line-height: 1.55;
}

.seg {
  display: flex;
  gap: 3px;
  padding: 3px;
  background: #f2f5f9;
  border-radius: 10px;
}
.seg-wide { width: 100%; margin-bottom: 14px; }

.seg-btn {
  flex: 1;
  padding: 8px 10px;
  font-size: 13px;
  color: #475467;
  background: none;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  white-space: nowrap;
}
.seg-btn.is-active {
  background: #fff;
  color: var(--brand);
  font-weight: 600;
  box-shadow: 0 1px 3px rgba(16, 24, 40, .1);
}

.check {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 4px 0 10px;
  font-size: 13px;
  color: #475467;
  cursor: pointer;
}
.check input { width: 15px; height: 15px; accent-color: var(--brand); }

.form-error {
  display: none;
  margin: 0 0 8px;
  font-size: 13px;
  color: #d92d20;
}
.form-error.is-show { display: block; }

.status {
  min-height: 18px;
  margin: 6px 0 0;
  font-size: 12.5px;
  color: var(--muted);
}
.status.is-error { color: #d92d20; }
.status.is-ok { color: #0a8f4a; }

.preview {
  margin-top: 10px;
  padding: 12px;
  background: #fbfcfe;
  border: 1px solid #f0f4f9;
  border-radius: 12px;
}
.preview-title { margin: 0 0 6px; font-size: 13px; }
.preview-list {
  margin: 0 0 10px;
  padding-left: 18px;
  font-size: 12.5px;
  color: #475467;
}
.preview-list li { margin: 2px 0; }

/* 算法列表 */
.method-list { list-style: none; margin: 0; padding: 0; }

.method-item {
  position: relative;
  display: block;
  width: 100%;
  margin-bottom: 8px;
  padding: 10px 40px 10px 12px;
  text-align: left;
  background: #fbfcfe;
  border: 1px solid var(--line);
  border-radius: 10px;
  cursor: pointer;
}
.method-item:hover { border-color: #cfd8e3; }
.method-item.is-active { border-color: var(--brand); background: #f2f8ff; }
.method-name { display: block; font-size: 14px; font-weight: 600; }
.method-desc { display: block; font-size: 12px; color: var(--muted); }
.method-check {
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--brand);
  font-weight: 700;
}

/* ==================== Toast ==================== */
.toast {
  position: fixed;
  left: 50%;
  bottom: 34px;
  z-index: 60;
  padding: 10px 18px;
  font-size: 13px;
  color: #fff;
  background: rgba(16, 24, 40, .92);
  border-radius: 999px;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 12px);
  transition: opacity .2s ease, transform .2s ease;
  max-width: calc(100vw - 40px);
}
.toast.is-show { opacity: 1; transform: translate(-50%, 0); }

/* ==================== 响应式 ==================== */
@media (max-width: 640px) {
  .view { padding: 12px; }
  .card { padding: 14px; border-radius: 12px; }

  .result-value { font-size: 44px; }
  .result-stats { grid-template-columns: repeat(2, 1fr); row-gap: 12px; }
  .result-stats .num { font-size: 18px; }

  .toolbar-right { width: 100%; margin-left: 0; justify-content: flex-end; }

  .course { flex-wrap: wrap; gap: 6px 10px; }
  .course-ops { width: 100%; justify-content: flex-end; }
  .course-gpa { font-size: 17px; }

  .bar-row { grid-template-columns: 82px 1fr 74px; gap: 8px; font-size: 12px; }
  .stat-grid { grid-template-columns: repeat(3, 1fr); }

  .info-table th { width: 100px; font-size: 13px; }
  .info-table td { font-size: 13px; word-break: break-all; }

  .app-footer { padding-bottom: 32px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}