:root {
  color-scheme: light;
  --canvas: #f7f8f5;
  --paper: #fff;
  --ink: #22332c;
  --muted: #596b62;
  --line: #dce5de;
  --green: #285b47;
  --deep: #204938;
  --wash: #eaf2eb;
  --focus: #a75524;
  font-family: system-ui, "Microsoft YaHei", sans-serif;
  font-size: 15px;
  color: var(--ink);
  background: var(--canvas);
}

*, *::before, *::after { box-sizing: border-box; }
body { display: flex; flex-direction: column; min-height: 100vh; margin: 0; }
body.on-study { height: 100dvh; min-height: 395px; }
h1, h2, p, dl, dd { margin: 0; }
a { color: inherit; text-decoration: none; }
button, select, input, textarea { font: inherit; color: inherit; }
button, select { cursor: pointer; }
[hidden] { display: none !important; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 3px; }
.sr { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.sprites { position: absolute; width: 0; height: 0; overflow: hidden; }
.icon { width: 18px; height: 18px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }

.topbar { flex: none; background: var(--paper); border-bottom: 1px solid var(--line); }
.top-inner { width: min(1240px, calc(100% - 64px)); min-height: 65px; margin-inline: auto; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 16px; }
.brand { display: flex; align-items: center; justify-self: start; gap: 10px; white-space: nowrap; }
.brand-icon { display: grid; place-items: center; width: 36px; height: 36px; border-radius: 10px; background: var(--deep); color: white; }
.brand strong, .brand small { display: block; }
.brand strong { font-size: 16px; font-weight: 750; }
.brand small { font-size: 10px; margin-top: 1px; color: var(--muted); letter-spacing: .07em; }
.topbar nav { display: flex; gap: 5px; }
.topbar nav a { display: flex; align-items: center; justify-content: center; gap: 7px; min-height: 39px; padding: 0 15px; border-radius: 9px; color: var(--muted); font-weight: 600; white-space: nowrap; }
.topbar nav .icon { width: 16px; height: 16px; }
.topbar nav a:hover, .topbar nav a[aria-current] { background: var(--wash); color: var(--deep); }
.on-auth .topbar nav { visibility: hidden; }
.app-download { grid-column: 3; justify-self: end; white-space: nowrap; }
.shell { flex: 1; min-height: 0; }

.button, select, input[type="search"] { min-height: 40px; background: var(--paper); border: 1px solid var(--line); border-radius: 9px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 7px; padding: 0 12px; font-size: 14px; line-height: 1.3; font-weight: 650; }
.button:hover, select:hover { background: #f0f4ef; }
.button.quiet { border-color: transparent; background: transparent; color: var(--muted); }
.button.quiet:hover { color: var(--deep); background: var(--wash); }
.button.primary { color: white; border-color: var(--green); background: var(--green); }
.button.primary:hover { background: var(--deep); border-color: var(--deep); }
.button .icon { width: 16px; height: 16px; }
select { padding: 0 24px 0 10px; max-width: 100%; }

.reading-width { width: min(800px, calc(100% - 44px)); margin-inline: auto; }
#study, #review { height: 100%; }
#lesson-workspace { height: 100%; display: grid; grid-template: auto minmax(0, 1fr) auto / minmax(0, 1fr); }
#review .composer-dock:has(#thinking[hidden]):has(#resume-run[hidden]):has(#form-error[hidden]) { display: none; }
#review .dialogue-inner { min-height: 0; padding-top: 20px; }
.review-dashboard { display: grid; gap: 14px; padding-bottom: 14px; }
.review-dashboard .study-activities { justify-content: flex-start; margin: 0; gap: 3px; padding: 3px; width: fit-content; border: 1px solid var(--line); border-radius: 12px; background: var(--paper); }
.review-dashboard .study-activities .button { border: 0; min-height: 40px; }
.review-chips, .review-count { display: flex; flex-wrap: wrap; gap: 7px; }
.review-chips .button[aria-pressed="true"] { background: var(--wash); border-color: var(--green); color: var(--deep); }
.review-due { padding: clamp(14px, 3vw, 22px); border: 1px solid var(--line); border-radius: 13px; background: var(--wash); }
.review-due-top { display: flex; align-items: baseline; gap: 8px; color: var(--deep); }
.review-due-top strong { font-size: 42px; line-height: 1.1; }
.review-due-top span { font-weight: 700; }
#review-due-summary { margin: 6px 0 13px; color: var(--muted); }
.review-meta { margin-top: 8px; color: var(--muted); font-size: 12px; }
.review-knowledge-groups { margin-top: 14px; display: grid; gap: 12px; }
.review-group { padding: 13px 15px; }
.review-group h3 { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 3px 8px; margin: 0; font-size: 15px; }
.review-group h3 small, .review-point small { color: var(--muted); font-weight: 500; }
.review-point { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 8px; padding: 10px 0; }
.review-point + .review-point { border-top: 1px solid var(--line); }
.review-point strong, .review-point small { display: block; overflow-wrap: anywhere; }
.review-point small { margin-top: 3px; }
.review-point .review-day { padding: 3px 7px; border-radius: 6px; background: var(--wash); font-size: 12px; white-space: nowrap; }
.review-point .review-day.today { background: #fff0dc; color: #854812; }
.review-exam { padding: clamp(14px, 3vw, 22px); }
.review-options { padding: 0; margin: 0 0 14px; border: 0; min-width: 0; }
.review-options legend { padding: 0 0 7px; font-weight: 700; }
.review-options > label, .review-count label { display: flex; align-items: center; gap: 8px; border: 1px solid var(--line); border-radius: 9px; padding: 9px 12px; cursor: pointer; }
.review-options > label + label { margin-top: 6px; }
.review-options label:has(:checked) { background: var(--wash); border-color: var(--green); }
.review-options label small { display: block; margin-top: 3px; color: var(--muted); }
.review-options label small:empty, #review-plan-status:empty { display: none; }
#review-resume { justify-self: start; max-width: 100%; min-width: 0; text-align: left; }
#review-resume-title { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.review-result h2 { margin-bottom: 12px; font-size: 19px; }
#review-result-body { max-width: none; padding: 0; border: 0; }
@media (max-width: 520px) {
  #review .dialogue-inner { padding-top: 12px; }
  .review-dashboard .study-activities { width: 100%; }
  .review-dashboard .study-activities .button { flex: 1; }
  .review-due .button, .review-exam .button { width: 100%; }
}
.lesson-bar { background: var(--canvas); border-bottom: 1px solid var(--line); }
.lesson-bar-inner { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 10px; padding-block: 8px; }
.lesson-heading { min-width: 0; }
.lesson-heading h1 { font-size: 19px; font-weight: 750; line-height: 1.3; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.lesson-heading p { font-size: 12px; margin-top: 4px; color: var(--muted); }
.lesson-actions { display: flex; gap: 5px; flex: none; }
.lesson-actions .button { min-height: 36px; white-space: nowrap; }
.dialogue-scroll { overflow-y: auto; overscroll-behavior-y: contain; scrollbar-gutter: stable both-edges; background: #fcfdfb; }
.dialogue-scroll:focus-visible { outline-offset: -3px; }
.dialogue-inner { min-height: 100%; display: flex; flex-direction: column; padding-block: 28px; }
.welcome { align-self: stretch; margin: auto 0; padding-block: 8px; text-align: center; }
.welcome-mark { width: 50px; height: 50px; margin: 0 auto 16px; display: grid; place-items: center; color: var(--green); background: var(--wash); border-radius: 15px; }
.welcome-mark .icon { width: 25px; height: 25px; }
.welcome h2 { color: var(--deep); font-size: clamp(25px, 3.8vw, 38px); font-weight: 770; letter-spacing: -.045em; line-height: 1.3; }
.welcome p { margin: 12px auto 0; max-width: 440px; color: var(--muted); line-height: 1.65; }
.study-setup .button { margin-top: 14px; }
.examples { margin-top: 22px; display: flex; justify-content: center; gap: 7px; flex-wrap: wrap; }
.study-activities { display: flex; justify-content: center; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.study-activities .button { min-height: 38px; }
.study-activities .button[aria-pressed="true"] { border-color: var(--green); background: var(--wash); color: var(--deep); }
.activity-attempt label { font-size: 13px; font-weight: 650; color: var(--muted); }
.activity-attempt { margin: 2px 12px 8px; padding-top: 8px; border-top: 1px solid var(--line); }
.composer .activity-attempt textarea { padding: 6px 0; min-height: 52px; }
.exam-paper { padding: clamp(14px, 4vw, 24px); margin-top: 16px; min-width: 0; }
.exam-paper-head { display: flex; align-items: baseline; justify-content: space-between; gap: 6px 14px; flex-wrap: wrap; }
.exam-paper-head h2 { font-size: 19px; }
.exam-paper-head p { font-size: 13px; color: var(--muted); }
.exam-question { min-width: 0; margin: 16px 0; padding: 12px; border: 1px solid var(--line); border-radius: 9px; }
.exam-question legend { padding: 0 5px; font-size: 13px; color: var(--muted); }
.exam-stem { overflow-wrap: anywhere; line-height: 1.6; margin-bottom: 9px; }
.exam-option { display: flex; gap: 8px; align-items: baseline; min-height: 32px; cursor: pointer; }
.exam-option > span { min-width: 0; overflow-wrap: anywhere; }
.exam-question textarea { display: block; width: 100%; max-width: 100%; min-height: 55px; padding: 7px; border: 1px solid var(--line); border-radius: 8px; resize: vertical; }
#practice-status:not(:empty) { margin-block: 8px; font-size: 13px; color: var(--muted); }
#practice-questions summary { width: fit-content; cursor: pointer; color: var(--green); }
#practice-questions details > div { margin-top: 8px; }
.example { min-height: 35px; padding-inline: 11px; color: var(--green); font-size: 13px; font-weight: 560; }
.example .icon { width: 12px; height: 12px; }
.resume { margin-top: 10px; min-height: 36px; font-size: 12px; font-weight: 560; max-width: 100%; }
.resume > span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.messages { display: flex; flex-direction: column; gap: 21px; }
.message { min-width: 0; max-width: 100%; }
.message.student { align-self: flex-end; width: fit-content; max-width: min(84%, 560px); border: 1px solid #e0ebe0; border-radius: 16px 16px 4px 16px; background: var(--wash); padding: 10px 14px; }
.message.teacher { display: grid; grid-template-columns: 31px minmax(0, 1fr); align-items: start; gap: 10px; }
.message-head { display: flex; align-items: center; flex-wrap: wrap; gap: 7px; margin-bottom: 4px; min-height: 24px; }
.message-head strong { font-size: 13px; font-weight: 750; }
.student .message-head { min-height: 18px; }
.student .message-head strong { color: var(--green); font-size: 12px; }
.message-text { white-space: pre-wrap; overflow-wrap: anywhere; font-size: 16px; line-height: 1.8; max-width: 690px; }
.message img { display: block; max-width: 100%; max-height: min(230px, 30dvh); object-fit: contain; margin-top: 8px; border-radius: 8px; }

.composer-dock { background: var(--canvas); border-top: 1px solid var(--line); }
.dock-inner { padding: 11px 0 max(10px, env(safe-area-inset-bottom)); }
.thinking { display: flex; align-items: center; min-width: 0; gap: 7px; margin: 0 1px 7px; color: var(--muted); font-size: 12px; line-height: 1.45; white-space: nowrap; }
.thinking-dot { width: 6px; height: 6px; flex: none; border-radius: 50%; background: #789584; }
.thinking[data-pending] .thinking-dot { background: #a66c43; }
.thinking strong { flex: none; color: var(--deep); font-weight: 650; }
#thinking-note { min-width: 0; overflow: hidden; text-overflow: ellipsis; }
.quick { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 8px; }
.quick .button { min-height: 33px; color: var(--green); font-size: 13px; }
#resume-run { min-height: 33px; margin-bottom: 8px; }
.sign-out { margin-top: 16px; }
.composer { background: var(--paper); border: 1px solid #ccdace; border-radius: 15px; box-shadow: 0 2px 8px #23382c0a; }
.composer textarea { display: block; width: 100%; height: 65px; min-height: 0; border: 0; border-radius: 14px 14px 0 0; padding: 12px 13px 4px; resize: none; background: transparent; line-height: 1.5; }
.composer textarea::placeholder, input::placeholder { color: #617369; }
.composer textarea:focus { outline: none; background: #f4f8f4; }
.button:disabled { opacity: .55; cursor: default; }
.form-foot { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 4px 8px 8px; }
.composer-tools { display: flex; gap: 4px; align-items: center; min-width: 0; }
.composer-tools select, .composer-tools .button { min-height: 35px; font-size: 13px; }
.composer-tools select { padding-left: 8px; padding-right: 5px; }
.send { margin-left: auto; min-height: 38px; flex: none; white-space: nowrap; }
.error { margin: 6px 2px 0; color: #983f30; font-size: 13px; }
.attachment { display: flex; align-items: center; gap: 8px; max-width: 100%; padding: 0 9px 5px; font-size: 13px; }
.attachment img { width: 43px; height: 35px; object-fit: contain; border-radius: 4px; background: var(--wash); }
.attachment span { overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.icon-button { display: grid; place-items: center; flex: none; width: 34px; height: 34px; border: 0; border-radius: 8px; background: transparent; }
.icon-button:hover { background: var(--wash); }

.subpage { width: min(800px, calc(100% - 44px)); margin: 0 auto; padding: 42px 0 54px; }
.subhead { margin-bottom: 20px; }
.subhead h1 { margin-top: 8px; color: var(--deep); font-size: clamp(27px, 4vw, 36px); line-height: 1.25; }
.panel { min-width: 0; background: var(--paper); border: 1px solid var(--line); border-radius: 14px; }
.records, .profile, .wallet { padding: 20px; }
.record-bar { display: flex; flex-wrap: wrap; gap: 8px; padding-bottom: 13px; border-bottom: 1px solid var(--line); }
.record-bar input { width: min(100%, 300px); min-width: 0; padding: 0 10px; }
.record { width: 100%; display: grid; grid-template-columns: minmax(0, 1fr) auto auto; align-items: center; gap: 10px; min-height: 63px; padding: 10px 4px; border: 0; border-bottom: 1px solid var(--line); background: transparent; text-align: left; }
.record:last-child { border-bottom: 0; }
.record:hover { background: var(--canvas); }
.record strong, .record small { display: block; overflow-wrap: anywhere; }
.record small { margin-top: 4px; color: var(--muted); }
.record .icon { color: var(--muted); }
.status { border: 1px solid var(--line); border-radius: 99px; padding: 4px 8px; background: #f4f6f3; color: var(--muted); font-size: 12px; white-space: nowrap; }
.status[data-state="讲解中"] { background: #faf1e2; color: #754e2a; }
.empty { padding: 23px 4px 6px; color: var(--muted); }
.account-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.panel-top { display: flex; align-items: center; gap: 10px; }
.panel-top h2 { font-size: 17px; }
.panel-top p { margin-top: 3px; color: var(--muted); font-size: 13px; }
.tile { display: grid; place-items: center; flex: none; width: 38px; height: 38px; border-radius: 10px; background: var(--wash); color: var(--green); }
.tile.peach { background: #fbefdf; color: #7d492d; }
.profile dl { margin: 14px 0; }
.profile dl div { display: flex; justify-content: space-between; gap: 8px; border-bottom: 1px solid var(--line); padding: 8px 0; }
.profile dt { color: var(--muted); }
.profile dd { font-weight: 650; }
.balance { margin: 18px 0; color: var(--green); font-size: 42px; font-weight: 750; line-height: 1.1; }
.balance span { font-size: 15px; }
.wallet-actions { display: flex; gap: 7px; }

dialog { width: min(420px, calc(100% - 28px)); max-height: calc(100% - 28px); padding: 22px; border: 1px solid var(--line); border-radius: 15px; background: var(--paper); color: var(--ink); box-shadow: 0 12px 42px #20362a24; }
dialog::backdrop { background: #18352a69; }
dialog h2 { font-size: 20px; }
dialog p { margin: 10px 0; white-space: pre-wrap; overflow-wrap: anywhere; line-height: 1.6; }
dialog form { margin-top: 14px; }
.setup-heading { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.setup-form select { width: 100%; }
#setup-refresh { margin-top: 4px; }
.original-question { padding: 10px; border-radius: 8px; background: var(--canvas); }
.quiet-status { color: var(--muted); font-size: 13px; }
#question-detail label { margin-right: 6px; }

.auth-page { width: min(430px, calc(100% - 28px)); margin-inline: auto; padding: clamp(22px, 7vh, 62px) 0 32px; }
.auth-panel { background: var(--paper); border: 1px solid var(--line); border-radius: 18px; padding: 26px 29px 22px; box-shadow: 0 7px 28px #20362a0a; }
.auth-mark { display: grid; place-items: center; width: 39px; height: 39px; margin-bottom: 13px; border-radius: 11px; background: var(--wash); color: var(--green); }
.auth-mark .icon { width: 20px; height: 20px; }
.auth-heading h1 { color: var(--deep); font-size: 27px; line-height: 1.3; letter-spacing: -.035em; }
.auth-heading p { margin-top: 7px; color: var(--muted); font-size: 13px; line-height: 1.6; }
#auth-form { margin-top: 20px; }
.auth-field + .auth-field { margin-top: 13px; }
.auth-field > label { display: block; margin-bottom: 6px; font-size: 13px; font-weight: 680; }
.phone-field, .code-field { display: flex; align-items: center; gap: 8px; }
.phone-field { gap: 0; border: 1px solid var(--line); border-radius: 9px; }
.phone-field:focus-within { outline: 2px solid var(--focus); outline-offset: 2px; }
.phone-prefix { flex: none; color: var(--muted); padding: 0 11px; border-right: 1px solid var(--line); font-size: 13px; }
.auth-field input { width: 100%; min-width: 0; min-height: 42px; border: 1px solid var(--line); border-radius: 9px; padding: 0 10px; background: transparent; font-size: 16px; }
.phone-field input { border: 0; }
.phone-field input:focus { outline: none; }
.auth-field input::placeholder { font-size: 13px; }
.code-field .button { flex: none; min-width: 101px; min-height: 42px; padding-inline: 7px; color: var(--green); font-size: 13px; font-variant-numeric: tabular-nums; }
.phone-field:has([aria-invalid="true"]), .auth-field input[aria-invalid="true"] { border-color: #b95e50; }
.auth-error { margin-top: 5px; color: #983f30; font-size: 12px; line-height: 1.45; }
.auth-code-status { color: var(--green); font-size: 12px; line-height: 1.5; }
.auth-code-status:not(:empty) { margin-top: 5px; }
.auth-agreement { display: flex; align-items: flex-start; gap: 7px; margin-top: 15px; color: var(--muted); font-size: 12px; line-height: 1.65; }
.auth-agreement input { flex: none; width: 15px; height: 15px; margin: 2px 0 0; accent-color: var(--green); }
.auth-agreement label { cursor: pointer; }
.text-button { border: 0; padding: 0; background: transparent; color: var(--green); font-size: inherit; font-weight: 650; }
.text-button:hover { text-decoration: underline; }
.auth-submit { width: 100%; min-height: 43px; margin-top: 15px; }

@media (max-width: 600px) {
  .top-inner { width: calc(100% - 28px); min-height: 53px; grid-template-columns: 1fr auto auto; gap: 6px; }
  .brand { gap: 7px; }
  .brand-icon { width: 31px; height: 31px; border-radius: 8px; }
  .brand small { display: none; }
  .topbar nav { gap: 1px; }
  .topbar nav a { min-height: 37px; gap: 5px; padding: 0 8px; font-size: 13px; }
  .topbar nav .icon { width: 14px; height: 14px; }
  .reading-width, .subpage { width: calc(100% - 26px); }
  .lesson-bar-inner { min-height: 61px; }
  .lesson-heading h1 { font-size: 16px; }
  .lesson-actions .button { padding: 0 6px; gap: 4px; font-size: 12px; }
  .lesson-actions .icon { width: 14px; height: 14px; }
  .dialogue-scroll { scrollbar-gutter: auto; }
  .dialogue-inner { padding-block: 17px; }
  .welcome-mark { width: 40px; height: 40px; margin-bottom: 12px; }
  .welcome p { margin-top: 8px; font-size: 14px; }
  .examples { margin-top: 14px; gap: 5px; }
  .example { padding-inline: 7px; font-size: 12px; }
  .messages { gap: 16px; }
  .message.teacher { grid-template-columns: 26px minmax(0, 1fr); gap: 7px; }
  .message-text { line-height: 1.7; }
  .dock-inner { padding-top: 7px; }
  .composer textarea { height: 56px; font-size: 16px; }
  .subpage { padding: 25px 0 38px; }
  .records, .profile, .wallet { padding: 13px; }
  .record { grid-template-columns: minmax(0, 1fr) auto; gap: 6px; }
  .record .icon { display: none; }
  .account-grid { grid-template-columns: 1fr; gap: 10px; }
  .auth-panel { padding: 19px 16px 17px; }
}

@media (max-width: 420px) {
  .topbar nav .icon, .app-download .icon { display: none; }
  .topbar nav a, .app-download { padding-inline: 7px; }
  .top-inner:has(.app-download:not([hidden])) { grid-template-columns: minmax(0, 1fr) auto; }
  .top-inner:has(.app-download:not([hidden])) nav { grid-area: 2 / 1 / 3 / 3; justify-content: center; }
  .top-inner .app-download { grid-area: 1 / 2; }
  .on-auth .top-inner:has(.app-download:not([hidden])) nav { display: none; }
}

@media (max-width: 370px) {
  .lesson-actions .button { gap: 3px; padding-inline: 5px; }
  .composer-tools .button { gap: 4px; padding-inline: 4px; }
  .form-foot { gap: 3px; }
  .send { padding-inline: 8px; }
}

@media (max-height: 510px) {
  .top-inner { min-height: 46px; }
  .lesson-bar-inner { min-height: 46px; padding-block: 4px; }
  .dialogue-inner { padding-block: 10px; }
  .welcome-mark { display: none; }
  .dock-inner { padding-top: 6px; }
}
.teacher .message-text { white-space: normal; }
.message-text p { margin: .5em 0; }
.message-text > :first-child { margin-top: 0; }
.message-text > :last-child { margin-bottom: 0; }
.message-text pre, .message-text table, .lesson-math.display { max-width: 100%; overflow-x: auto; }
.teacher .message-text table { display: block; border-collapse: collapse; }
.teacher .message-text th, .teacher .message-text td { border: 1px solid #d5ded5; padding: .25em .5em; }
.teacher .message-text figure { margin: .75em 0; }
.teacher .message-text figure img { max-height: none; }
.lesson-math.display { display: block; }

/* Confirmed conversation card treatment. */

.dialogue-scroll { background: #fafcf9; }
.message.teacher, .message.student { display: block; width: fit-content; max-width: min(100%, 690px); padding: 0; border: 0; border-radius: 0; background: transparent; }
.message.teacher { align-self: flex-start; }
.message.student { align-self: flex-end; }
.message-head, .student .message-head { min-height: 0; margin: 0 0 6px; padding: 0 4px; background: transparent; }
.student .message-head { justify-content: flex-end; padding-right: 0; }
.message-head strong, .student .message-head strong { font-size: 13px; color: #415a4a; }
.student .message-head strong { color: #425c77; }
.message-text { padding: 12px 16px; border: 1px solid; border-radius: 14px; }
.teacher .message-text { background: #f1f8f0; border-color: #d8e8d8; }
.student .message-text { background: #f0f5fb; border-color: #d9e5f1; }
@media (max-width: 600px) { .message.teacher, .message.student { max-width: 100%; } .message-text { padding: 11px 13px; } }