@import url('https://fonts.googleapis.com/css2?family=DM+Serif+Display:ital@0;1&family=DM+Mono:wght@400;500&family=Literata:ital,wght@0,300;0,400;1,300&display=swap');

/* 1) Global variables */
:root {
  color-scheme: light;
  --bg:                      #f7f3ec;
  --card:                    #ffffff;
  --card-dark:               #f1e9dd;
  --border:                  #d8ccba;
  --gold:                    #9a6d1f;
  --gold-dim:                #7f6128;
  --gold-bg:                 rgba(154,109,31,0.11);
  --text:                    #2c2418;
  --muted:                   #6b6456;
  --correct:                 #2f8f6a;
  --wrong:                   #b24a44;
  --input-bg:                #fcfaf6;
  --orange:                  #b86a25;
  --orange-bg:               rgba(184,106,37,0.10);
  --header-bg-accent:        rgba(154,109,31,0.10);
  --header-bg-line:          rgba(154,109,31,0.05);
  --table-head-bg:           #ebe2d4;
  --table-row-hover:         rgba(154,109,31,0.07);
  --irreg-row-hover:         rgba(184,106,37,0.17);
  --irreg-border:            rgba(184,106,37,0.35);
  --btn-primary-hover:       #ae7d29;
  --input-correct-bg:        rgba(47,143,106,0.10);
  --input-wrong-bg:          rgba(178,74,68,0.10);
  --shadow-soft:             rgba(44,36,24,0.08);
  --shadow-strong:           rgba(44,36,24,0.14);
  --noise-opacity:           0.16;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]):not([data-theme="dark"]) {
    color-scheme: dark;
    --bg:                      #0f0e0b;
    --card:                    #1a1814;
    --card-dark:               #131109;
    --border:                  #2e2b24;
    --gold:                    #d4a843;
    --gold-dim:                #8a6e2a;
    --gold-bg:                 rgba(212,168,67,0.07);
    --text:                    #e8e0d0;
    --muted:                   #8a816f;
    --correct:                 #4caf87;
    --wrong:                   #c0504a;
    --input-bg:                #211f1a;
    --orange:                  #c8813a;
    --orange-bg:               rgba(200,129,58,0.08);
    --header-bg-accent:        rgba(212,168,67,0.10);
    --header-bg-line:          rgba(212,168,67,0.03);
    --table-head-bg:           #1f1c16;
    --table-row-hover:         rgba(212,168,67,0.04);
    --irreg-row-hover:         rgba(200,129,58,0.13);
    --irreg-border:            rgba(200,129,58,0.25);
    --btn-primary-hover:       #e0b550;
    --input-correct-bg:        rgba(76,175,135,0.06);
    --input-wrong-bg:          rgba(192,80,74,0.06);
    --shadow-soft:             rgba(32,56,96,0.08);
    --shadow-strong:           rgba(32,56,96,0.12);
    --noise-opacity:           0.4;
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg:                      #0f0e0b;
  --card:                    #1a1814;
  --card-dark:               #131109;
  --border:                  #2e2b24;
  --gold:                    #d4a843;
  --gold-dim:                #8a6e2a;
  --gold-bg:                 rgba(212,168,67,0.07);
  --text:                    #e8e0d0;
  --muted:                   #8a816f;
  --correct:                 #4caf87;
  --wrong:                   #c0504a;
  --input-bg:                #211f1a;
  --orange:                  #c8813a;
  --orange-bg:               rgba(200,129,58,0.08);
  --header-bg-accent:        rgba(212,168,67,0.10);
  --header-bg-line:          rgba(212,168,67,0.03);
  --table-head-bg:           #1f1c16;
  --table-row-hover:         rgba(212,168,67,0.04);
  --irreg-row-hover:         rgba(200,129,58,0.13);
  --irreg-border:            rgba(200,129,58,0.25);
  --btn-primary-hover:       #e0b550;
  --input-correct-bg:        rgba(76,175,135,0.06);
  --input-wrong-bg:          rgba(192,80,74,0.06);
  --shadow-soft:             rgba(32,56,96,0.08);
  --shadow-strong:           rgba(32,56,96,0.12);
  --noise-opacity:           0.4;
}

/* 2) Reset and base */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Literata', serif;
  min-height: 100vh;
}

/* Subtle background texture */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 0;
  opacity: var(--noise-opacity);
}

.container {
  width: min(1080px, 100% - 40px);
  margin: 0 auto;
}

.brand-name {
  font-family: 'DM Serif Display', serif;
  font-size: clamp(2rem, 5vw, 3rem);
  text-decoration: none;
  color: var(--gold);
  line-height: 1.1;
  letter-spacing: 0.01em;
}

.brand-meta {
  font-family: 'DM Mono', monospace;
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold-dim);
  white-space: nowrap;
}

.brand-block {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
}

.header-subtitle {
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.4;
  margin: 0;
}

.global-header {
  position: relative;
  z-index: 2;
  border-bottom: 1px solid var(--border);
  background:
    radial-gradient(circle at 12% 0%, var(--header-bg-accent), transparent 36%),
    linear-gradient(180deg, var(--header-bg-line), transparent 72%);
}

.header-inner {
  display: flex;
  justify-content: flex-start;
  align-items: flex-start;
  gap: 10px;
  padding: 18px 0 16px;
}

.theme-switch {
  display: flex;
  gap: 2px;
  flex-shrink: 0;
  align-items: center;
  margin-left: auto;
}

.theme-btn {
  font-family: 'DM Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  padding: 5px 9px;
  border-radius: 2px;
  cursor: pointer;
  transition: all 0.15s;
}

.theme-btn.active {
  border-color: var(--gold-dim);
  color: var(--gold);
  background: var(--gold-bg);
}

.theme-btn:hover:not(.active) {
  border-color: var(--muted);
  color: var(--text);
}

.page-subtitle {
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.5;
  max-width: 66ch;
}

.page-intro {
  margin-bottom: 24px;
}

.page-intro h1,
.lesson-hero h1 {
  font-family: 'DM Serif Display', serif;
  font-size: clamp(2rem, 5vw, 3rem);
  color: var(--text);
  font-weight: 400;
  line-height: 1.1;
  margin-top: 10px;
}

.lesson-main {
  width: min(1080px, 100% - 40px);
  margin: 0 auto;
  padding-top: 22px;
}

.lesson-hero {
  padding: 26px 0 18px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0;
  font-family: 'DM Serif Display', serif;
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1.1;
  letter-spacing: 0;
  color: var(--muted);
  width: auto;
  margin-top: 10px;
  margin-left: 2px;
}

.crumb-slash {
  display: inline-block;
  font-style: italic;
  line-height: 0.9;
  margin-right: 0.16em;
  transform: translateY(-0.04em) skew(-10deg);
}

.breadcrumb a {
  color: var(--gold);
  text-decoration: none;
  transition: color 0.2s, text-decoration-color 0.2s;
}

.breadcrumb a:hover {
  color: var(--text);
  text-decoration: underline;
}

.breadcrumb [aria-current="page"] {
  color: var(--text);
}

/* 3) Page layout: tabs, sections */

.tabs {
  position: relative;
  z-index: 1;
  display: flex;
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  margin-bottom: 24px;
  background: var(--card);
  box-shadow: 0 4px 16px var(--shadow-soft);
}

.tab {
  flex: 1;
  padding: 14px 16px;
  font-family: 'DM Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.tab:hover { color: var(--text); }

.tab.active {
  color: var(--gold);
  border-bottom-color: var(--gold);
  background: var(--gold-bg);
}

.section { display: none; position: relative; z-index: 1; }
.section.active { display: block; }

/* 4) Theory section */
.teoria-wrap {
  max-width: 920px;
  margin: 0 auto;
  padding: 0 0 64px;
}

.t-label {
  font-family: 'DM Mono', monospace;
  font-size: 0.62rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold-dim);
  margin-bottom: 8px;
}

h2 {
  font-family: 'DM Serif Display', serif;
  font-size: 1.5rem;
  color: var(--gold);
  font-weight: 400;
  margin-bottom: 20px;
}

.main-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--card);
  border: 1px solid var(--border);
  margin-bottom: 20px;
  font-size: 0.95rem;
}

.main-table thead tr { background: var(--table-head-bg); }

.main-table thead th {
  font-family: 'DM Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
  padding: 12px 16px;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.main-table thead th:first-child { text-align: left; }

.main-table tbody tr {
  border-bottom: 1px solid var(--border);
  transition: background 0.15s;
}

.main-table tbody tr:last-child { border-bottom: none; }
.main-table tbody tr:hover       { background: var(--table-row-hover); }
.main-table tbody tr.irreg       { background: var(--orange-bg); }
.main-table tbody tr.irreg:hover { background: var(--irreg-row-hover); }

.main-table tbody tr.section-row td {
  font-family: 'DM Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold-dim);
  padding: 7px 16px;
  background: var(--card-dark);
  border-top: 1px solid var(--border);
}

.main-table td               { padding: 9px 16px; vertical-align: middle; }
.main-table td:first-child   { font-style: italic; color: var(--muted); font-size: 0.9rem; }
.main-table td:not(:first-child) {
  text-align: center;
  font-family: 'DM Serif Display', serif;
  font-size: 1.05rem;
  color: var(--gold);
}

.badge {
  display: inline-block;
  font-family: 'DM Mono', monospace;
  font-size: 0.55rem;
  background: var(--orange);
  color: var(--bg);
  border-radius: 2px;
  padding: 1px 5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  vertical-align: middle;
  margin-left: 4px;
  font-style: normal;
}

.note {
  background: var(--card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--gold-dim);
  padding: 13px 18px;
  font-size: 0.87rem;
  color: var(--muted);
  margin-bottom: 28px;
  line-height: 1.7;
}

.note strong { color: var(--text); }
.note em     { color: var(--gold); font-style: italic; }

.info-box {
  background: var(--card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--gold);
  padding: 16px 20px;
  margin-bottom: 20px;
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.8;
}

.info-box strong {
  font-family: 'DM Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--gold);
  display: block;
  margin-bottom: 8px;
}

.info-box em {
  font-family: 'DM Serif Display', serif;
  font-size: 1rem;
  color: var(--text);
  font-style: italic;
}

.func-list {
  background: var(--card);
  border: 1px solid var(--border);
  overflow: hidden;
  margin-bottom: 28px;
}

.func-item {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 11px 18px;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}

.func-item:last-child { border-bottom: none; }

.func-num {
  font-family: 'DM Mono', monospace;
  font-size: 0.65rem;
  color: var(--gold-dim);
  min-width: 16px;
}

.func-name {
  font-family: 'DM Mono', monospace;
  font-size: 0.7rem;
  color: var(--gold);
  letter-spacing: 0.06em;
  min-width: 150px;
}

.func-ex {
  font-style: italic;
  color: var(--muted);
  font-size: 0.87rem;
}

.conj-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr;
  border: 1px solid var(--border);
  overflow: hidden;
  margin-bottom: 20px;
  font-size: 0.9rem;
}

.conj-head {
  background: var(--table-head-bg);
  font-family: 'DM Mono', monospace;
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gold);
  padding: 10px 12px;
  text-align: center;
  border-bottom: 1px solid var(--border);
  border-right: 1px solid var(--border);
}

.conj-head:last-child { border-right: none; }

.conj-cell {
  padding: 9px 12px;
  border-top: 1px solid var(--border);
  border-right: 1px solid var(--border);
  text-align: center;
  background: var(--card);
}

.conj-cell:nth-child(4n) { border-right: none; }

.conj-cell .pronoun {
  font-style: italic;
  font-size: 0.9rem;
  color: var(--muted);
  display: block;
  margin-bottom: 0;
}

.conj-cell .haber {
  font-family: 'DM Mono', monospace;
  color: var(--gold);
  font-size: 0.9rem;
}

.conj-cell .participle {
  font-family: 'DM Serif Display', serif;
  font-size: 1rem;
  color: var(--text);
  font-style: italic;
}

.part-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}

.part-card {
  background: var(--card);
  border: 1px solid var(--border);
  padding: 14px 16px;
  text-align: center;
}

.part-card .ending {
  font-family: 'DM Mono', monospace;
  font-size: 0.68rem;
  color: var(--muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 6px;
}

.part-card .rule-arrow {
  font-family: 'DM Serif Display', serif;
  font-size: 1.1rem;
  color: var(--gold);
}

.part-card .example {
  font-size: 0.82rem;
  color: var(--muted);
  margin-top: 6px;
  font-style: italic;
  line-height: 1.6;
}

.irreg-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 28px;
}

.irreg-item {
  background: var(--orange-bg);
  border: 1px solid var(--irreg-border);
  padding: 10px 12px;
  text-align: center;
}

.irreg-inf {
  font-family: 'DM Mono', monospace;
  font-size: 0.72rem;
  color: var(--orange);
  margin-bottom: 4px;
}

.irreg-part {
  font-family: 'DM Serif Display', serif;
  font-size: 1.1rem;
  color: var(--text);
}

/* 5) Quiz section */
.quiz-wrap {
  max-width: 680px;
  margin: 0 auto;
  padding: 0 0 64px;
}

.mode-row {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.filter-rows {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 24px;
}

.filter-rows .mode-row {
  margin-bottom: 0;
}

.filter-row-label {
  font-family: 'DM Mono', monospace;
  font-size: 0.58rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold-dim);
  margin-bottom: 4px;
}

.empty-filters {
  text-align: center;
  padding: 48px 32px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 8px 24px var(--shadow-soft);
  font-size: 1rem;
  color: var(--muted);
  font-style: italic;
}

.mode-btn {
  font-family: 'DM Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  padding: 6px 12px;
  border-radius: 2px;
  cursor: pointer;
  transition: all 0.15s;
}

.mode-btn.active {
  border-color: var(--gold-dim);
  color: var(--gold);
  background: var(--gold-bg);
}

.mode-btn:hover:not(.active) { border-color: var(--muted); color: var(--text); }

.progress-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 28px;
}

.progress-bar {
  flex: 1;
  height: 3px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--gold);
  border-radius: 2px;
  transition: width 0.4s ease;
}

.progress-text {
  font-family: 'DM Mono', monospace;
  font-size: 0.72rem;
  color: var(--muted);
  white-space: nowrap;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 36px 32px 32px;
  animation: fadeSlide 0.3s ease;
  box-shadow: 0 8px 24px var(--shadow-soft);
}

@keyframes fadeSlide {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

.card-number {
  font-family: 'DM Mono', monospace;
  font-size: 0.65rem;
  color: var(--gold-dim);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.prompt {
  font-size: 1.3rem;
  font-weight: 300;
  color: var(--text);
  margin-bottom: 8px;
  line-height: 1.5;
}

.prompt strong {
  font-family: 'DM Serif Display', serif;
  color: var(--gold);
  font-weight: 400;
  font-size: 1.5rem;
}

.hint {
  font-size: 0.8rem;
  color: var(--muted);
  font-style: italic;
  margin-bottom: 28px;
}

.input-row {
  display: flex;
  gap: 10px;
  align-items: center;
}

.excl {
  font-family: 'DM Serif Display', serif;
  font-size: 1.5rem;
  color: var(--gold-dim);
  line-height: 1;
}

input[type="text"] {
  flex: 1;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--text);
  font-family: 'DM Serif Display', serif;
  font-size: 1.3rem;
  padding: 10px 14px;
  outline: none;
  transition: border-color 0.2s;
  caret-color: var(--gold);
}

input[type="text"]:focus              { border-color: var(--gold-dim); }
input[type="text"].correct            { border-color: var(--correct); color: var(--correct); background: var(--input-correct-bg); }
input[type="text"].wrong              { border-color: var(--wrong);   color: var(--wrong);   background: var(--input-wrong-bg); animation: shake 0.3s ease; }
input[type="text"].accent-missing     { border-color: var(--gold);    color: var(--gold);    background: var(--gold-bg); }

@keyframes shake {
  0%,100% { transform: translateX(0); }
  25%     { transform: translateX(-6px); }
  75%     { transform: translateX(6px); }
}

.feedback {
  margin-top: 14px;
  font-size: 0.9rem;
  min-height: 1.4em;
  font-style: italic;
}

.feedback.correct        { color: var(--correct); }
.feedback.wrong          { color: var(--wrong); }
.feedback.accent-missing { color: var(--gold); }

.btn-row {
  display: flex;
  gap: 10px;
  margin-top: 28px;
}

button {
  font-family: 'DM Mono', monospace;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border: none;
  border-radius: 3px;
  padding: 11px 20px;
  cursor: pointer;
  transition: all 0.15s;
}

.btn-check  { background: var(--gold); color: var(--bg); flex: 1; }
.btn-check:hover  { background: var(--btn-primary-hover); }
.btn-skip   { background: transparent; border: 1px solid var(--border); color: var(--muted); }
.btn-skip:hover   { border-color: var(--muted); color: var(--text); }
.btn-next   { background: var(--gold); color: var(--bg); flex: 1; }
.btn-next:hover   { background: var(--btn-primary-hover); }
.btn-restart { background: var(--gold); color: var(--bg); padding: 12px 32px; font-size: 0.78rem; }
.btn-restart:hover { background: var(--btn-primary-hover); }

.score-screen {
  text-align: center;
  padding: 48px 24px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  animation: fadeSlide 0.4s ease;
  box-shadow: 0 8px 24px var(--shadow-soft);
}

.score-big {
  font-family: 'DM Serif Display', serif;
  font-size: 5rem;
  color: var(--gold);
  line-height: 1;
  margin-bottom: 8px;
}

.score-label {
  font-family: 'DM Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 28px;
}

.score-msg {
  font-size: 1.05rem;
  color: var(--text);
  font-style: italic;
  margin-bottom: 32px;
}

.stats { display: flex; gap: 24px; justify-content: center; margin-bottom: 28px; }
.stat  { text-align: center; }

.stat-val {
  font-family: 'DM Serif Display', serif;
  font-size: 2rem;
  color: var(--text);
  line-height: 1;
}

.stat-val.good   { color: var(--correct); }
.stat-val.bad    { color: var(--wrong); }
.stat-val.accent { color: var(--gold); }

.stat-lbl {
  font-family: 'DM Mono', monospace;
  font-size: 0.62rem;
  color: var(--muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-top: 4px;
}

.mistakes-list {
  text-align: left;
  margin-top: 32px;
  border-top: 1px solid var(--border);
  padding-top: 24px;
}

.mistakes-title {
  font-family: 'DM Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--gold-dim);
  margin-bottom: 16px;
}

.mistake-item {
  background: var(--card-dark);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px 16px;
  margin-bottom: 10px;
  font-size: 0.9rem;
}

.mistake-prompt {
  color: var(--muted);
  font-size: 0.85rem;
  margin-bottom: 6px;
  font-style: italic;
}

.mistake-details {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: baseline;
}

.mistake-val {
  font-family: 'DM Serif Display', serif;
  font-size: 1.1rem;
}

.mistake-val.user { color: var(--wrong); text-decoration: line-through; opacity: 0.8; }
.mistake-val.correct { color: var(--correct); }
.mistake-val.accent { color: var(--gold); }

/* 6) Utility helpers */
.mt-lg { margin-top: 32px; }
.mb-sm { margin-bottom: 12px; }

/* 7) Homepage */
.home-shell {
  position: relative;
  z-index: 1;
  width: min(1080px, 100% - 40px);
  margin: 0 auto;
  padding: 34px 0 70px;
}

.lesson-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.lesson-card {
  border: 1px solid var(--border);
  background: var(--card);
  padding: 18px 18px 20px;
  display: flex;
  flex-direction: column;
  min-height: 260px;
  border-radius: 12px;
  box-shadow: 0 8px 22px var(--shadow-soft);
  transition: border-color 0.2s ease, transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}

.lesson-card:hover {
  border-color: var(--gold-dim);
  transform: translateY(-3px);
  background: linear-gradient(180deg, var(--gold-bg), transparent 36%), var(--card);
  box-shadow: 0 14px 28px var(--shadow-strong);
}

.lesson-tag {
  font-family: 'DM Mono', monospace;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--gold-dim);
  font-size: 0.62rem;
  margin-bottom: 9px;
}

.lesson-card h2 {
  margin-bottom: 10px;
  font-size: 1.45rem;
  line-height: 1.2;
}

.lesson-card p {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

.lesson-link {
  margin-top: auto;
  align-self: flex-start;
  font-family: 'DM Mono', monospace;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.64rem;
  text-decoration: none;
  border: 1px solid var(--gold-dim);
  color: var(--gold);
  background: var(--gold-bg);
  padding: 9px 12px;
  transition: background 0.2s ease, color 0.2s ease;
}

.lesson-link:hover {
  background: var(--gold);
  color: var(--bg);
}

.lesson-card-soon {
  border-style: dashed;
}

.lesson-link-disabled {
  border-color: var(--border);
  color: var(--muted);
  background: transparent;
  cursor: not-allowed;
}

@media (max-width: 980px) {
  .lesson-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .container,
  .home-shell,
  .lesson-main {
    width: min(1080px, 100% - 26px);
  }

  .header-inner {
    padding-top: 14px;
    padding-bottom: 10px;
    flex-wrap: wrap;
    gap: 8px;
  }

  .breadcrumb {
    margin-top: 0;
    margin-left: 0;
  }

  .page-subtitle,
  .brand-meta {
    white-space: normal;
  }

  .header-subtitle {
    display: none;
  }

  .theme-switch {
    margin-left: auto;
  }

  .home-shell { padding-top: 24px; }

  .lesson-grid {
    grid-template-columns: 1fr;
  }

  .lesson-card {
    min-height: 0;
  }
}