:root {
  --bg:       #0c0c14;
  --surface:  #18182a;
  --surface2: #20203a;
  --surface3: #2a2a42;
  --accent:   #7c3aed;
  --accent2:  #a78bfa;
  --text:     #e2e2f0;
  --dim:      #8888a8;
  --border:   #2a2a3e;
  --red:      #f87171;
  --green:    #4ade80;
  --yellow:   #facc15;
  --glow:     rgba(124,58,237,0.15);
  --radius:   16px;
  --shadow:   0 4px 32px rgba(0,0,0,0.5);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 15px;
  font-weight: 400;
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ── NAV ─────────────────────────────────────────────────────────────────── */
nav {
  background: linear-gradient(180deg, #1f1f32, #18182a);
  border-bottom: 1px solid rgba(139,92,246,0.2);
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 4px;
  height: 64px;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
}

nav .logo {
  font-size: 20px;
  font-weight: 800;
  color: var(--accent2);
  letter-spacing: -0.5px;
  margin-right: 12px;
  flex-shrink: 0;
}

nav a {
  color: var(--dim);
  text-decoration: none;
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

nav a:hover {
  color: var(--text);
  background: rgba(255,255,255,0.05);
}

nav a.active {
  color: var(--accent2);
  background: rgba(167,139,250,0.08);
}

nav a.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 12px;
  right: 12px;
  height: 2px;
  background: var(--accent2);
  border-radius: 2px;
}

.nav-brand {
  margin-right: 12px;
  flex-shrink: 0;
}

.nav-utils {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

.nav-user {
  color: var(--dim);
  font-size: 13px;
  padding: 0 4px;
}

.nav-icon {
  font-size: 16px;
  line-height: 1;
}

.nav-lang {
  display: flex;
  align-items: center;
  gap: 3px;
  font-size: 12px;
}

.nav-lang a {
  padding: 4px 2px;
  text-decoration: none;
}

.nav-lang span {
  color: var(--dim);
  opacity: 0.3;
}

.nav-tour {
  border: 1px solid var(--border);
}

/* ── LAYOUT ──────────────────────────────────────────────────────────────── */
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 36px 20px;
}

/* ── CARDS ───────────────────────────────────────────────────────────────── */
.card {
  background: linear-gradient(145deg, #18182a, #1e1e32);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.card + .card { margin-top: 20px; }

.card-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--dim);
  margin-bottom: 18px;
}

/* ── GRID ────────────────────────────────────────────────────────────────── */
.grid-2   { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.grid-3   { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.two-col  { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.four-col { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }

@media (max-width: 600px) {
  .grid-2, .grid-3, .two-col { grid-template-columns: 1fr; }
  .four-col { grid-template-columns: 1fr 1fr; }
}

/* ── STAT CARDS ──────────────────────────────────────────────────────────── */
.stat {
  background: linear-gradient(145deg, #18182a, #1e1e32);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
  position: relative;
  overflow: hidden;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.stat::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  border-radius: var(--radius) var(--radius) 0 0;
}

.stat-mood::before   { background: #4ade80; box-shadow: 0 0 12px rgba(74,222,128,0.5); }
.stat-energy::before { background: #a78bfa; box-shadow: 0 0 12px rgba(167,139,250,0.5); }
.stat-anxiety::before{ background: #f87171; box-shadow: 0 0 12px rgba(248,113,113,0.5); }
.stat-sleep::before  { background: #facc15; box-shadow: 0 0 12px rgba(250,204,21,0.5); }

.stat-value {
  font-size: 40px;
  font-weight: 300;
  color: var(--accent2);
  line-height: 1;
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}

.stat-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ── SCALE SELECTOR ──────────────────────────────────────────────────────── */
@keyframes scalePulse {
  0%   { transform: scale(1); }
  50%  { transform: scale(1.14); }
  100% { transform: scale(1.1); }
}

.scale-group {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.scale-group input[type=radio] { display: none; }

.scale-group label {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 2px solid var(--border);
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  color: var(--dim);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  user-select: none;
}

.scale-group input[type=radio]:checked + label {
  border-color: var(--accent);
  background: var(--accent);
  color: white;
  box-shadow: 0 0 20px rgba(124,58,237,0.45);
  animation: scalePulse 0.25s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.scale-group label:hover {
  border-color: var(--accent2);
  color: var(--accent2);
  background: rgba(167,139,250,0.06);
}

/* ── ASSESSMENT QUESTIONS ────────────────────────────────────────────────── */
.question-block {
  border-bottom: 1px solid var(--border);
  padding: 20px 0;
}

.question-block:last-child { border-bottom: none; }

.question-text {
  font-size: 15px;
  color: var(--text);
  margin-bottom: 14px;
  line-height: 1.5;
}

.question-num {
  color: var(--accent2);
  font-weight: 700;
  margin-right: 8px;
}

.scale-labels {
  display: flex;
  justify-content: space-between;
  margin-top: 8px;
  padding: 0 4px;
}

.scale-labels span {
  font-size: 11px;
  color: var(--dim);
}

/* ── FORMS ───────────────────────────────────────────────────────────────── */
.form-group { margin-bottom: 20px; }

.form-group label {
  display: block;
  font-size: 11px;
  font-weight: 600;
  color: var(--dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 10px;
}

textarea {
  width: 100%;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text);
  padding: 14px;
  font-size: 15px;
  font-family: inherit;
  resize: vertical;
  min-height: 80px;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(124,58,237,0.15);
}

input[type=text]:focus,
input[type=password]:focus,
input[type=email]:focus,
input[type=date]:focus,
select:focus {
  outline: none;
  border-color: var(--accent) !important;
  box-shadow: 0 0 0 3px rgba(124,58,237,0.15) !important;
}

/* ── BUTTONS ─────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 12px;
  border: none;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  font-family: inherit;
  letter-spacing: 0.02em;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--accent);
  color: white;
  box-shadow: 0 0 20px rgba(124,58,237,0.3);
}

.btn-primary::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -75%;
  width: 50%;
  height: 200%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
  transform: skewX(-20deg);
  transition: left 0.5s ease;
}

.btn-primary:hover {
  background: var(--accent2);
  box-shadow: 0 0 32px rgba(124,58,237,0.5);
  transform: translateY(-1px);
}

.btn-primary:hover::after {
  left: 125%;
}

.btn-ghost {
  background: var(--surface2);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent2);
  background: var(--glow);
}

.btn-row {
  display: flex;
  gap: 12px;
  margin-top: 28px;
  flex-wrap: wrap;
}

/* ── SEVERITY BADGE ──────────────────────────────────────────────────────── */
.badge {
  display: inline-block;
  padding: 3px 11px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.badge-minimal            { background: rgba(74,222,128,0.12);  color: var(--green); }
.badge-mild               { background: rgba(250,204,21,0.12);  color: var(--yellow); }
.badge-moderate           { background: rgba(251,146,60,0.12);  color: #fb923c; }
.badge-moderately-severe  { background: rgba(248,113,113,0.15); color: var(--red); }
.badge-severe             { background: rgba(248,113,113,0.22); color: var(--red); }
.badge-low-stress         { background: rgba(74,222,128,0.12);  color: var(--green); }
.badge-moderate-stress    { background: rgba(250,204,21,0.12);  color: var(--yellow); }
.badge-high-stress        { background: rgba(248,113,113,0.2);  color: var(--red); }
.badge-subclinical          { background: rgba(74,222,128,0.15);  color: var(--green); }
.badge-significant-symptoms { background: rgba(251,146,60,0.15);  color: #fb923c; }
.badge-no-insomnia        { background: rgba(74,222,128,0.12);  color: var(--green); }
.badge-subthreshold-insomnia { background: rgba(250,204,21,0.12); color: var(--yellow); }
.badge-moderate-insomnia  { background: rgba(251,146,60,0.12);  color: #fb923c; }
.badge-severe-insomnia    { background: rgba(248,113,113,0.22); color: var(--red); }

/* ── ASSESSMENT RESULT ───────────────────────────────────────────────────── */
.result-score {
  text-align: center;
  padding: 40px 20px;
}

.result-number {
  font-size: 72px;
  font-weight: 300;
  color: var(--accent2);
  line-height: 1;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.result-max {
  font-size: 18px;
  color: var(--dim);
  margin-bottom: 20px;
}

.progress-bar {
  width: 100%;
  height: 6px;
  background: var(--surface2);
  border-radius: 4px;
  overflow: hidden;
  margin: 16px 0;
}

.progress-fill {
  height: 100%;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── HISTORY TABLE ───────────────────────────────────────────────────────── */
.history-table {
  width: 100%;
  border-collapse: collapse;
}

.history-table th {
  text-align: left;
  padding: 10px 14px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--dim);
  border-bottom: 1px solid var(--border);
}

.history-table td {
  padding: 13px 14px;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  font-size: 14px;
  color: var(--text);
  transition: all 0.15s ease;
}

.history-table tr:last-child td { border-bottom: none; }

.history-table tbody tr {
  cursor: default;
  transition: all 0.15s ease;
}

.history-table tbody tr:hover td {
  background: rgba(255,255,255,0.025);
  transform: translateY(-1px);
}

/* ── CHART ───────────────────────────────────────────────────────────────── */
#chart { width: 100%; height: 200px; }

/* ── PAGE HEADER ─────────────────────────────────────────────────────────── */
.page-header {
  margin-bottom: 32px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.page-header h1 {
  font-size: 28px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.01em;
  margin-bottom: 4px;
}

.page-header p {
  color: var(--dim);
  font-size: 14px;
  margin: 0;
}

/* ── EMPTY STATE ─────────────────────────────────────────────────────────── */
.empty {
  text-align: center;
  padding: 48px 24px;
  color: var(--dim);
}

.empty-icon {
  font-size: 28px;
  color: var(--border);
  margin-bottom: 12px;
  display: block;
}

.empty-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--dim);
  margin-bottom: 6px;
}

.empty-sub {
  font-size: 13px;
  color: var(--border);
  margin-bottom: 20px;
}

/* ── ASSESS CARDS ────────────────────────────────────────────────────────── */
.assess-card {
  background: linear-gradient(145deg, #18182a, #1e1e32);
  border: 1px solid rgba(255,255,255,0.06);
  border-left-width: 3px;
  border-radius: var(--radius);
  padding: 20px;
  text-decoration: none;
  display: block;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.assess-card:hover {
  border-color: rgba(255,255,255,0.06);
  border-left-color: inherit;
  box-shadow: 0 0 28px rgba(124,58,237,0.18), 0 4px 20px rgba(0,0,0,0.3);
  transform: translateY(-2px);
}

.assess-gad7  { border-left-color: #facc15; }
.assess-phq9  { border-left-color: #60a5fa; }
.assess-pss   { border-left-color: #fb923c; }
.assess-pcl5  { border-left-color: #f87171; }
.assess-isi   { border-left-color: #a78bfa; }

.assess-card h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.01em;
  margin-bottom: 4px;
}

.assess-card p {
  font-size: 12px;
  color: var(--dim);
  margin-bottom: 10px;
}

.assess-card .tag {
  font-size: 11px;
  color: var(--dim);
  font-weight: 600;
  letter-spacing: 0.04em;
}

/* ── NAV SECONDARY COLLAPSE ─────────────────────────────────────────────── */
.nav-secondary {
  display: flex;
  gap: 4px;
  align-items: center;
  flex-shrink: 0;
}
.nav-more-btn { display: none; }

@media (max-width: 640px) {
  .nav-secondary { display: none; }
  .nav-secondary.open {
    display: flex;
    order: 3;
    width: 100%;
    gap: 4px;
    align-items: center;
    overflow-x: auto;
    padding: 0 2px 6px;
    scrollbar-width: none;
  }
  .nav-secondary.open::-webkit-scrollbar { display: none; }
  .nav-more-btn {
    display: block;
    color: var(--dim);
    font-size: 12px;
    padding: 5px 9px;
    border-radius: 8px;
    cursor: pointer;
    background: none;
    border: 1px solid var(--border);
    font-family: inherit;
    font-weight: 500;
    white-space: nowrap;
    flex-shrink: 0;
  }
}

/* ── MOBILE ──────────────────────────────────────────────────────────────── */
@media (max-width: 640px) {
  nav {
    padding: 6px 10px;
    gap: 3px;
    overflow: hidden;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
    height: auto;
    min-height: 56px;
    flex-wrap: wrap;
  }
  nav::-webkit-scrollbar { display: none; }
  nav .logo { font-size: 16px; margin-right: 6px; flex-shrink: 0; }
  nav a { padding: 5px 9px; font-size: 12px; white-space: nowrap; flex-shrink: 0; }
  nav a.active::after { display: none; }
  .nav-brand {
    width: 100%;
    margin-right: 0;
    padding: 2px 2px 4px;
  }
  .nav-utils {
    margin-left: auto;
    gap: 2px;
  }
  .nav-user,
  .nav-tour {
    display: none;
  }
  .nav-lang {
    font-size: 11px;
  }
  .nav-icon {
    font-size: 15px;
  }

  .container { padding: 20px 12px; }
  .card { padding: 18px; }
  .page-header { margin-bottom: 24px; }
  .page-header h1 { font-size: 22px; }

  .stat-value { font-size: 32px; }

  input[type=text], input[type=email], input[type=password],
  input[type=date], select, textarea { font-size: 16px !important; }

  .scale-group { gap: 6px; }
  .scale-group label { width: 52px; height: 52px; font-size: 17px; }

  .btn-row { flex-direction: column; gap: 10px; }
  .btn-row .btn, .btn-row a.btn { width: 100%; justify-content: center; text-align: center; }

  .history-table th, .history-table td { padding: 10px 10px; font-size: 13px; }

  .assess-card { padding: 16px; }
  .assess-card h3 { font-size: 15px; }

  .med-btn { padding: 12px 18px; }
  .toggle-btn span { padding: 12px 16px; }
  .form-group { margin-bottom: 16px; }
}

/* ── THOUGHT CHALLENGE CARDS ─────────────────────────────── */
.challenge-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 12px;
  transition: border-color 0.2s, box-shadow 0.2s;
  position: relative;
  overflow: hidden;
}

.challenge-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--accent);
  opacity: 0.5;
  transition: opacity 0.2s;
}

.challenge-card:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(139,92,246,0.08);
}

.challenge-card:focus-within::before {
  opacity: 1;
}

.challenge-card-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--accent2);
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
  margin-bottom: 14px;
}

.challenge-card-question {
  font-size: 15px;
  color: var(--text);
  line-height: 1.65;
  font-weight: 500;
  margin-bottom: 16px;
}

.challenge-card textarea {
  width: 100%;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 12px 14px;
  font-size: 14px;
  font-family: inherit;
  resize: vertical;
  min-height: 72px;
  line-height: 1.6;
  transition: border-color 0.15s;
}

.challenge-card textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.challenge-card textarea::placeholder {
  color: var(--dim);
  font-style: italic;
}

.challenge-reframe-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 12px;
  position: relative;
  overflow: hidden;
}

.challenge-reframe-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--green);
}

.challenge-reframe-card textarea {
  width: 100%;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 14px;
  font-size: 15px;
  font-family: inherit;
  resize: vertical;
  min-height: 100px;
  line-height: 1.7;
  transition: border-color 0.15s;
}

.challenge-reframe-card textarea:focus {
  outline: none;
  border-color: var(--green);
  box-shadow: 0 0 0 3px rgba(74,222,128,0.08);
}

.challenge-thought-display {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 20px;
  position: relative;
  overflow: hidden;
}

.challenge-thought-display::before {
  content: '\201C';
  position: absolute;
  top: -8px;
  left: 16px;
  font-size: 64px;
  color: var(--accent);
  opacity: 0.15;
  font-family: Georgia, serif;
  line-height: 1;
}

.challenge-thought-display p {
  font-size: 15px;
  color: var(--dim);
  line-height: 1.7;
  font-style: italic;
  padding-left: 8px;
}

.distortion-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 20px;
  background: var(--surface2);
  color: var(--accent2);
  border: 1px solid var(--border);
  margin-right: 6px;
  margin-top: 8px;
}

.save-choice-row {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.save-choice-label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 14px;
  color: var(--text);
}

.save-choice-label input[type=radio] {
  accent-color: var(--accent);
  width: 16px;
  height: 16px;
}

.challenge-progress {
  display: flex;
  gap: 6px;
  align-items: center;
  margin-bottom: 20px;
}

.challenge-progress-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border);
}

.challenge-progress-dot.active {
  background: var(--accent);
  width: 20px;
  border-radius: 4px;
}

.challenge-progress-dot.done {
  background: var(--accent2);
  opacity: 0.4;
}

.challenge-before-after {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 20px;
}

@media (max-width: 600px) {
  .challenge-before-after { grid-template-columns: 1fr; }
}

.challenge-before {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
}

.challenge-after {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  border-top: 3px solid var(--green);
}

.challenge-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--dim);
  margin-bottom: 8px;
}

.challenge-after .challenge-label {
  color: var(--green);
}