/* ============ 全局：多邻国风格 ============ */
:root {
  --green: #58cc02;
  --green-dark: #46a302;
  --blue: #1cb0f6;
  --blue-dark: #1899d6;
  --red: #ff4b4b;
  --red-dark: #e03535;
  --orange: #ff9600;
  --yellow: #ffc800;
  --purple: #ce82ff;
  --gray-bg: #f7f7f7;
  --gray-border: #e5e5e5;
  --gray-text: #777;
  --text: #3c3c3c;
  --radius: 16px;
}

* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html, body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
  background: var(--gray-bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.5;
  overscroll-behavior: none;
}

button { font-family: inherit; cursor: pointer; border: none; background: none; }
input { font-family: inherit; }

.screen { display: none; min-height: 100vh; max-width: 560px; margin: 0 auto; padding: 16px; }
.screen.active { display: block; }

/* ============ 大按钮（多邻国3D立体感） ============ */
.btn {
  display: block;
  width: 100%;
  padding: 14px 20px;
  border-radius: var(--radius);
  font-size: 17px;
  font-weight: 700;
  color: #fff;
  text-align: center;
  text-transform: none;
  transition: filter .1s, transform .05s;
  user-select: none;
}
.btn-green { background: var(--green); box-shadow: 0 4px 0 var(--green-dark); }
.btn-blue { background: var(--blue); box-shadow: 0 4px 0 var(--blue-dark); }
.btn-red { background: var(--red); box-shadow: 0 4px 0 var(--red-dark); }
.btn-outline {
  background: #fff; color: var(--gray-text);
  border: 2px solid var(--gray-border); box-shadow: 0 4px 0 var(--gray-border);
}
.btn:active { transform: translateY(3px); box-shadow: 0 1px 0 rgba(0,0,0,.2); }
.btn:disabled { filter: grayscale(.8) opacity(.6); pointer-events: none; }
.btn-sm { width: auto; display: inline-block; padding: 8px 18px; font-size: 15px; }

/* ============ 登录页 ============ */
.login-wrap { padding-top: 8vh; text-align: center; }
.login-title { font-size: 26px; font-weight: 800; margin: 12px 0 4px; }
.login-sub { color: var(--gray-text); margin-bottom: 28px; }

.role-tabs { display: flex; gap: 12px; margin-bottom: 24px; }
.role-tab {
  flex: 1; padding: 14px 8px; border-radius: var(--radius);
  border: 2px solid var(--gray-border); box-shadow: 0 3px 0 var(--gray-border);
  background: #fff; font-weight: 700; color: var(--gray-text); font-size: 16px;
}
.role-tab.selected { border-color: var(--blue); color: var(--blue); box-shadow: 0 3px 0 var(--blue); background: #f0faff; }
.role-tab .emoji { display: block; font-size: 30px; margin-bottom: 4px; }

.field { margin-bottom: 16px; text-align: left; }
.field label { display: block; font-weight: 700; font-size: 14px; color: var(--gray-text); margin-bottom: 6px; }
.field input {
  width: 100%; padding: 13px 14px; font-size: 17px;
  border: 2px solid var(--gray-border); border-radius: 12px; outline: none; background: #fff;
}
.field input:focus { border-color: var(--blue); }
.login-msg { min-height: 22px; color: var(--red); font-size: 14px; margin: 8px 0; font-weight: 600; }
.link-btn { color: var(--blue); font-weight: 700; font-size: 14px; margin-top: 14px; display: inline-block; }

/* ============ 学生端首页 ============ */
.topbar {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 4px 14px; position: sticky; top: 0; background: var(--gray-bg); z-index: 5;
}
.topbar .spacer { flex: 1; }
.stat-chip {
  display: flex; align-items: center; gap: 4px;
  font-weight: 800; font-size: 15px; padding: 5px 10px;
  background: #fff; border-radius: 999px; border: 2px solid var(--gray-border);
}
.stat-chip .icon { font-size: 17px; }
.stat-streak { color: var(--orange); }
.stat-xp { color: var(--yellow); }
.stat-gem { color: var(--blue); }
.icon-btn { font-size: 22px; padding: 4px; }

.home-head { display: flex; align-items: center; gap: 12px; margin-bottom: 6px; }
.home-hello { font-size: 20px; font-weight: 800; }
.home-motto { color: var(--gray-text); font-size: 14px; }

.level-card {
  background: linear-gradient(135deg, #1cb0f6, #7b5cff);
  border-radius: var(--radius); color: #fff; padding: 14px 16px; margin: 12px 0 18px;
  box-shadow: 0 4px 0 rgba(0,0,0,.15);
}
.level-row { display: flex; justify-content: space-between; font-weight: 700; font-size: 14px; }
.level-bar { height: 12px; background: rgba(255,255,255,.3); border-radius: 999px; margin-top: 8px; overflow: hidden; }
.level-fill { height: 100%; background: var(--yellow); border-radius: 999px; transition: width .6s; }

.section-title { font-size: 18px; font-weight: 800; margin: 18px 0 10px; }

.subject-tabs { display: flex; gap: 10px; margin-bottom: 14px; }
.subject-tab {
  flex: 1; padding: 10px; border-radius: 12px; font-weight: 700; font-size: 15px;
  border: 2px solid var(--gray-border); background: #fff; color: var(--gray-text);
}
.subject-tab.selected { border-color: var(--green); color: var(--green-dark); background: #f2fde8; box-shadow: 0 3px 0 var(--green); }

.unit-list { display: flex; flex-direction: column; gap: 12px; padding-bottom: 40px; }
.unit-card {
  display: flex; align-items: center; gap: 14px;
  background: #fff; border: 2px solid var(--gray-border); border-radius: var(--radius);
  padding: 14px; box-shadow: 0 3px 0 var(--gray-border); text-align: left; width: 100%;
}
.unit-icon {
  width: 52px; height: 52px; border-radius: 14px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center; font-size: 26px;
  background: #e8f8ff;
}
.unit-info { flex: 1; min-width: 0; }
.unit-name { font-weight: 800; font-size: 16px; }
.unit-status { font-size: 13px; color: var(--gray-text); margin-top: 2px; }
.mastery-pill {
  flex-shrink: 0; font-size: 13px; font-weight: 800; padding: 4px 10px; border-radius: 999px;
}
.mastery-none { background: #f0f0f0; color: #aaa; }
.mastery-low { background: #ffe5e5; color: var(--red); }
.mastery-mid { background: #fff4d6; color: #c78500; }
.mastery-high { background: #e4f9d3; color: var(--green-dark); }

.unit-actions { display: flex; gap: 8px; margin-top: 8px; }
.mini-btn {
  padding: 7px 14px; border-radius: 10px; font-size: 13px; font-weight: 800;
  border: 2px solid var(--gray-border); background: #fff; color: var(--gray-text);
}
.mini-btn.assess { border-color: var(--blue); color: var(--blue); }
.mini-btn.practice { border-color: var(--green); color: var(--green-dark); }
.mini-btn.weak { border-color: var(--red); color: var(--red); animation: pulse 1.6s infinite; }

@keyframes pulse { 0%,100% { transform: scale(1); } 50% { transform: scale(1.06); } }

/* ============ 答题页 ============ */
.quiz-top { display: flex; align-items: center; gap: 12px; padding: 10px 0 16px; }
.quiz-close { font-size: 24px; color: var(--gray-text); padding: 4px 8px; }
.progress-track { flex: 1; height: 14px; background: var(--gray-border); border-radius: 999px; overflow: hidden; }
.progress-fill {
  height: 100%; background: var(--green); border-radius: 999px;
  transition: width .4s; position: relative;
}
.hearts { display: flex; align-items: center; gap: 3px; font-weight: 800; color: var(--red); font-size: 16px; }
.hearts .icon { font-size: 20px; }

.combo-badge {
  position: fixed; top: 70px; right: 16px; z-index: 30;
  background: linear-gradient(135deg, #ff9600, #ff4b4b); color: #fff;
  font-weight: 900; font-size: 16px; padding: 8px 14px; border-radius: 999px;
  box-shadow: 0 4px 12px rgba(255,75,75,.4);
  transform: scale(0); transition: transform .3s cubic-bezier(.34,1.56,.64,1);
}
.combo-badge.show { transform: scale(1); }
.combo-badge.bump { animation: bump .35s; }
@keyframes bump { 0% { transform: scale(1); } 40% { transform: scale(1.35) rotate(-6deg); } 100% { transform: scale(1); } }

.mascot-row { display: flex; align-items: flex-end; gap: 10px; margin-bottom: 10px; }
.mascot { width: 76px; height: 76px; flex-shrink: 0; }
.mascot.happy { animation: hop .5s; }
.mascot.sad { animation: shake .45s; }
@keyframes hop { 0%,100% { transform: translateY(0); } 35% { transform: translateY(-14px) rotate(-5deg); } 70% { transform: translateY(0); } }
@keyframes shake { 0%,100% { transform: translateX(0); } 20% { transform: translateX(-7px); } 45% { transform: translateX(7px); } 70% { transform: translateX(-5px); } }

.speech {
  background: #fff; border: 2px solid var(--gray-border); border-radius: 12px;
  padding: 8px 12px; font-size: 14px; font-weight: 700; color: var(--gray-text);
  position: relative; margin-bottom: 6px;
}
.speech:after {
  content: ""; position: absolute; left: -8px; bottom: 12px;
  border: 6px solid transparent; border-right-color: #fff;
}

.q-card { background: transparent; padding: 6px 0 100px; }
.q-tag {
  display: inline-block; font-size: 12px; font-weight: 800; color: var(--blue);
  background: #e8f7ff; padding: 4px 10px; border-radius: 999px; margin-bottom: 10px;
  letter-spacing: 1px;
}
.q-text { font-size: 21px; font-weight: 800; line-height: 1.5; margin-bottom: 20px; word-break: break-all; }
.q-text .big-num { font-size: 24px; color: var(--blue-dark); }

.options { display: flex; flex-direction: column; gap: 12px; }
.opt {
  background: #fff; border: 2px solid var(--gray-border); border-bottom-width: 4px;
  border-radius: 14px; padding: 14px 16px; font-size: 17px; font-weight: 700;
  text-align: left; color: var(--text); display: flex; align-items: center; gap: 12px;
  transition: background .15s, border-color .15s;
}
.opt .opt-key {
  width: 30px; height: 30px; border-radius: 8px; flex-shrink: 0;
  border: 2px solid var(--gray-border); display: flex; align-items: center; justify-content: center;
  font-size: 14px; font-weight: 800; color: var(--gray-text); background: #fff;
}
.opt.selected { border-color: var(--blue); background: #f0faff; color: var(--blue-dark); }
.opt.selected .opt-key { border-color: var(--blue); color: var(--blue); }
.opt.correct { border-color: var(--green); background: #e4f9d3; color: var(--green-dark); }
.opt.correct .opt-key { border-color: var(--green); color: var(--green-dark); }
.opt.wrong { border-color: var(--red); background: #ffe5e5; color: var(--red-dark); animation: shake .4s; }
.opt.wrong .opt-key { border-color: var(--red); color: var(--red); }
.opt:disabled { pointer-events: none; }

.fill-row { display: flex; gap: 10px; align-items: center; }
.fill-input {
  flex: 1; padding: 14px; font-size: 22px; font-weight: 800; text-align: center;
  border: 2px solid var(--gray-border); border-bottom-width: 4px; border-radius: 14px; outline: none;
  background: #fff; color: var(--text);
}
.fill-input:focus { border-color: var(--blue); }
.fill-input.correct { border-color: var(--green); background: #e4f9d3; }
.fill-input.wrong { border-color: var(--red); background: #ffe5e5; animation: shake .4s; }
.fill-unit { font-weight: 800; color: var(--gray-text); font-size: 17px; }

.quiz-bottom {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 20;
  background: #fff; border-top: 2px solid var(--gray-border);
  padding: 14px 16px calc(14px + env(safe-area-inset-bottom));
}
.quiz-bottom-inner { max-width: 560px; margin: 0 auto; }
.quiz-bottom.correct-bg { background: #d7ffb8; border-top-color: #d7ffb8; }
.quiz-bottom.wrong-bg { background: #ffdfe0; border-top-color: #ffdfe0; }

.feedback-line { font-size: 18px; font-weight: 900; margin-bottom: 4px; }
.feedback-line.ok { color: var(--green-dark); }
.feedback-line.bad { color: var(--red-dark); }
.explain-text { font-size: 14px; color: var(--text); margin-bottom: 10px; font-weight: 600; }
.quiz-bottom.correct-bg .explain-text { color: #3f7d16; }
.quiz-bottom.wrong-bg .explain-text { color: #a11f1f; }

/* ============ 结算页 ============ */
.result-wrap { text-align: center; padding-top: 6vh; }
.result-title { font-size: 26px; font-weight: 900; margin: 10px 0 4px; }
.result-sub { color: var(--gray-text); font-weight: 600; margin-bottom: 22px; }
.result-stats { display: flex; gap: 12px; justify-content: center; margin-bottom: 26px; }
.r-stat {
  border-radius: 14px; padding: 10px 6px; width: 100px;
  border: 2px solid; font-weight: 800;
}
.r-stat .v { font-size: 22px; }
.r-stat .k { font-size: 12px; margin-top: 2px; }
.r-acc { border-color: var(--green); color: var(--green); background: #f2fde8; }
.r-xp { border-color: var(--yellow); color: #c78500; background: #fff9e0; }
.r-mastery { border-color: var(--blue); color: var(--blue); background: #f0faff; }
.result-msg {
  background: #fff; border: 2px solid var(--gray-border); border-radius: var(--radius);
  padding: 14px; font-size: 15px; font-weight: 700; margin-bottom: 20px; text-align: left;
}
.result-actions { display: flex; flex-direction: column; gap: 12px; }

.xp-fly {
  position: fixed; z-index: 60; font-weight: 900; color: var(--yellow);
  font-size: 22px; pointer-events: none; text-shadow: 0 2px 4px rgba(0,0,0,.15);
  animation: flyup 1.1s ease-out forwards;
}
@keyframes flyup { 0% { opacity: 0; transform: translateY(0) scale(.6); } 20% { opacity: 1; transform: translateY(-14px) scale(1.1); } 100% { opacity: 0; transform: translateY(-80px) scale(1); } }

.screen-flash { position: fixed; inset: 0; z-index: 55; pointer-events: none; opacity: 0; }
.screen-flash.go-ok { animation: flashok .4s; }
.screen-flash.go-bad { animation: flashbad .4s; }
@keyframes flashok { 0% { opacity: 0; background: var(--green); } 25% { opacity: .22; } 100% { opacity: 0; } }
@keyframes flashbad { 0% { opacity: 0; background: var(--red); } 25% { opacity: .22; } 100% { opacity: 0; } }

/* 升级全屏庆祝 */
.levelup-mask {
  position: fixed; inset: 0; z-index: 80; background: rgba(0,0,0,.55);
  display: none; align-items: center; justify-content: center;
}
.levelup-mask.show { display: flex; }
.levelup-card {
  background: #fff; border-radius: 20px; padding: 30px 26px; text-align: center;
  width: 82%; max-width: 340px; animation: pop .45s cubic-bezier(.34,1.56,.64,1);
}
@keyframes pop { 0% { transform: scale(.4); opacity: 0; } 100% { transform: scale(1); opacity: 1; } }
.levelup-badge { font-size: 64px; animation: hop .8s infinite; display: inline-block; }
.levelup-title { font-size: 24px; font-weight: 900; color: var(--yellow); margin: 8px 0 2px; text-shadow: 0 2px 0 #e0a800; }
.levelup-sub { color: var(--gray-text); font-weight: 700; margin-bottom: 18px; }

/* 家长留言弹窗 */
.parent-msg-mask {
  position: fixed; inset: 0; z-index: 70; background: rgba(0,0,0,.45);
  display: none; align-items: center; justify-content: center;
}
.parent-msg-mask.show { display: flex; }
.parent-msg-card {
  background: #fffdf5; border: 3px solid var(--yellow); border-radius: 20px;
  padding: 24px; width: 84%; max-width: 360px; text-align: center;
  animation: pop .4s cubic-bezier(.34,1.56,.64,1);
}
.parent-msg-card .emoji { font-size: 44px; }
.parent-msg-card .title { font-weight: 900; font-size: 18px; margin: 8px 0 10px; color: #c78500; }
.parent-msg-card .content { font-size: 16px; font-weight: 700; line-height: 1.7; margin-bottom: 18px; text-align: left; word-break: break-all; }

/* ============ 家长端 ============ */
.p-header { display: flex; align-items: center; justify-content: space-between; padding: 12px 0; }
.p-title { font-size: 20px; font-weight: 900; }
.p-card {
  background: #fff; border: 2px solid var(--gray-border); border-radius: var(--radius);
  padding: 16px; margin-bottom: 14px;
}
.p-card h3 { font-size: 15px; font-weight: 800; color: var(--gray-text); margin-bottom: 12px; }
.p-summary { display: flex; gap: 10px; text-align: center; }
.p-summary .cell { flex: 1; background: var(--gray-bg); border-radius: 12px; padding: 10px 4px; }
.p-summary .v { font-size: 20px; font-weight: 900; }
.p-summary .k { font-size: 12px; color: var(--gray-text); margin-top: 2px; }
.v-orange { color: var(--orange); } .v-yellow { color: #c78500; } .v-blue { color: var(--blue); } .v-green { color: var(--green-dark); }

.mastery-row { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.mastery-name { width: 108px; font-size: 13px; font-weight: 700; flex-shrink: 0; }
.mastery-track { flex: 1; height: 14px; background: var(--gray-bg); border-radius: 999px; overflow: hidden; }
.mastery-fill { height: 100%; border-radius: 999px; transition: width .6s; }
.mf-low { background: var(--red); } .mf-mid { background: var(--yellow); } .mf-high { background: var(--green); }
.mastery-val { width: 38px; text-align: right; font-size: 13px; font-weight: 800; color: var(--gray-text); }

.session-item { display: flex; align-items: center; gap: 10px; padding: 9px 0; border-bottom: 1px solid var(--gray-bg); font-size: 14px; }
.session-item:last-child { border-bottom: none; }
.session-item .s-tag { font-size: 11px; font-weight: 800; padding: 2px 8px; border-radius: 999px; flex-shrink: 0; }
.s-assess { background: #e8f7ff; color: var(--blue-dark); }
.s-practice { background: #f2fde8; color: var(--green-dark); }
.session-item .s-name { flex: 1; font-weight: 700; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.session-item .s-acc { font-weight: 800; }
.session-item .s-time { color: var(--gray-text); font-size: 12px; flex-shrink: 0; }

.wrong-item { padding: 10px 0; border-bottom: 1px solid var(--gray-bg); }
.wrong-item:last-child { border-bottom: none; }
.wrong-q { font-weight: 700; font-size: 14px; }
.wrong-a { font-size: 13px; color: var(--gray-text); margin-top: 3px; }
.wrong-a .right { color: var(--green-dark); font-weight: 700; }
.tag-mastered { font-size: 11px; background: #e4f9d3; color: var(--green-dark); padding: 1px 7px; border-radius: 999px; font-weight: 800; margin-left: 6px; }

.msg-form textarea {
  width: 100%; border: 2px solid var(--gray-border); border-radius: 12px;
  padding: 12px; font-size: 15px; outline: none; resize: none; height: 80px; background: #fff;
}
.msg-form textarea:focus { border-color: var(--blue); }
.msg-form .btn { margin-top: 10px; }
.msg-hist { font-size: 13px; color: var(--gray-text); margin-top: 10px; }

.empty-tip { text-align: center; color: #bbb; font-weight: 700; padding: 18px 0; font-size: 14px; }

.back-home { margin-top: 10px; text-align: center; }

/* 失败页 */
.fail-emoji { font-size: 70px; animation: shake .6s; display: inline-block; }

/* 配置提示条 */
.notice-bar {
  background: #fff4d6; border: 2px solid var(--yellow); border-radius: 12px;
  padding: 10px 12px; font-size: 13px; font-weight: 700; color: #8a6100; margin-bottom: 14px;
}

@media (max-width: 380px) {
  .q-text { font-size: 19px; }
  .mascot { width: 62px; height: 62px; }
}

/* 题目配图（SVG 图形题） */
.q-fig { display: flex; justify-content: center; align-items: center; margin: 10px 0 2px; padding: 8px; background: #fff; border-radius: 10px; }
.q-fig svg { max-width: 100%; height: auto; }
.explain-text { white-space: normal; }