/* =============================================================================
   lms.css — ilovephysics.lk  (redesign: bold + minimal)
============================================================================= */

:root {
  --bg: #020617;
  --bg2: #0a1628;
  --cyan: #06b6d4;
  --border: #1e293b;
  --slate: #94a3b8;
  --dim: #475569;
  --line: rgba(6, 182, 212, 0.10);
  --red: #ef4444;
  --green: #10b981;
}

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

*:focus {
  outline: none;
}

*:focus-visible {
  outline: 2px solid rgba(6, 182, 212, .5);
  outline-offset: 3px;
}

html,
body {
  height: 100%;
}

body {
  background: var(--bg);
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 40px 40px;
  animation: bgShift 50s linear infinite;
  color: #e2e8f0;
  font-family: 'Inter', sans-serif;
  min-height: 100vh;
  overflow-x: hidden;
  overflow-y: scroll;
}

@keyframes bgShift {
  from {
    background-position: 0 0;
  }

  to {
    background-position: 40px 40px;
  }
}

.font-mono {
  font-family: 'JetBrains Mono', monospace;
}

/* ── App shell ───────────────────────────────────────────────────────────── */
#app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}


.nav-sys {
  font-family: 'JetBrains Mono', monospace;
  font-size: .6rem;
  color: var(--dim);
  letter-spacing: .2em;
  display: flex;
  align-items: center;
  gap: .5rem;
}

.nav-logo {
  height: 2.6rem;
  width: auto;
  display: block;
}

/* ── Screens ─────────────────────────────────────────────────────────────── */
.screen {
  display: none;
  flex: 1;
  align-items: center;
  justify-content: center;
  padding: 3rem 1.5rem;
}

.screen.active {
  display: flex;
}

/* ── Center panel (choice + auth screens) ────────────────────────────────── */
.center-panel {
  width: 100%;
  max-width: 520px;
  animation: fadeUp .55s cubic-bezier(.16, 1, .3, 1) both;
}

.center-panel.narrow {
  max-width: 400px;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(32px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ── Typography ──────────────────────────────────────────────────────────── */
.eyebrow {
  font-size: .6rem;
  letter-spacing: .35em;
  color: var(--cyan);
  text-transform: uppercase;
  margin-bottom: .75rem;
  display: flex;
  align-items: center;
  gap: .6rem;
}

.eyebrow::before {
  content: '';
  width: 20px;
  height: 1px;
  background: var(--cyan);
  flex-shrink: 0;
}

.hero-title {
  font-size: clamp(3.5rem, 10vw, 6rem);
  font-weight: 900;
  line-height: .95;
  color: #fff;
  letter-spacing: -.03em;
  margin-bottom: .75rem;
}

.hero-title span {
  color: var(--cyan);
}

.section-title {
  font-size: clamp(2.5rem, 7vw, 4rem);
  font-weight: 900;
  line-height: .95;
  color: #fff;
  letter-spacing: -.03em;
  margin-bottom: 2rem;
}

.section-title.compact {
  font-size: clamp(2rem, 5vw, 3rem);
  margin-bottom: 0;
}

.section-title span {
  color: var(--cyan);
}

.hero-sub {
  font-size: .75rem;
  color: var(--dim);
  letter-spacing: .1em;
  margin-bottom: 3rem;
}

/* ── Choice tiles ────────────────────────────────────────────────────────── */
.choice-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  margin-bottom: 2rem;
}

.choice-tile {
  background: rgba(10, 22, 40, 0.9);
  padding: 2rem 1.75rem;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: background .2s, transform .2s, box-shadow .2s;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  animation: fadeUp .55s cubic-bezier(.16, 1, .3, 1) both;
}

.choice-tile:first-child {
  animation-delay: .08s;
}

.choice-tile:last-child {
  animation-delay: .16s;
}

.choice-tile::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .3s;
}

.choice-tile:hover {
  background: rgba(15, 23, 42, .95);
  box-shadow: 0 18px 40px rgba(15, 23, 42, .9);
  transform: translateY(-2px);
}

.choice-tile:hover::after {
  transform: scaleX(1);
}

.choice-tile:hover .tile-arrow {
  transform: translateX(5px);
  color: var(--cyan);
}

.choice-tile.accent {
  background: var(--cyan);
  box-shadow: 0 20px 45px rgba(6, 182, 212, .35);
}

.choice-tile.accent::after {
  background: linear-gradient(to right, #0f172a, #020617);
}

.choice-tile.accent .tile-label {
  color: #020617;
}

.choice-tile.accent .tile-sub {
  color: #0f172a;
}

.choice-tile.accent .tile-arrow {
  color: #0f172a;
}

.choice-tile.accent:hover {
  background: #22d3ee;
  box-shadow: 0 26px 60px rgba(6, 182, 212, .5);
}

.tile-num {
  font-size: .6rem;
  letter-spacing: .2em;
  color: var(--dim);
  margin-bottom: 1.25rem;
}

.tile-label {
  font-size: 1.4rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -.02em;
  margin-bottom: .3rem;
}

.tile-sub {
  font-size: .65rem;
  color: var(--dim);
  letter-spacing: .05em;
}

.tile-arrow {
  position: absolute;
  top: 1.75rem;
  right: 1.75rem;
  font-size: 1.1rem;
  color: var(--dim);
  transition: all .25s;
}

/* ── Footnote ────────────────────────────────────────────────────────────── */
.footnote {
  font-size: .65rem;
  color: var(--dim);
  letter-spacing: .05em;
  text-align: center;
}

/* ── Back button ─────────────────────────────────────────────────────────── */
.back-btn {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  background: none;
  border: 1px solid var(--border);
  color: var(--dim);
  padding: .4rem .85rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: .6rem;
  letter-spacing: .15em;
  cursor: pointer;
  transition: all .2s;
}

.back-btn:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

/* ── Google button ───────────────────────────────────────────────────────── */
.btn-google {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .75rem;
  width: 100%;
  padding: .9rem 1.5rem;
  background: rgba(255, 255, 255, .03);
  border: 1px solid var(--border);
  color: #fff;
  font-size: .875rem;
  font-weight: 600;
  font-family: 'Inter', sans-serif;
  cursor: pointer;
  transition: all .25s;
  position: relative;
  overflow: hidden;
  margin-top: 1.5rem;
}

.btn-google::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(6, 182, 212, .07), transparent 60%);
  opacity: 0;
  transition: opacity .25s;
}

.btn-google:hover {
  border-color: rgba(6, 182, 212, .5);
}

.btn-google:hover::before {
  opacity: 1;
}

.btn-google:active {
  transform: scale(.99);
}

/* ── Primary button ──────────────────────────────────────────────────────── */
.btn-primary {
  width: 100%;
  padding: .9rem;
  background: var(--cyan);
  border: none;
  color: #000;
  font-size: .8rem;
  font-weight: 800;
  letter-spacing: .1em;
  font-family: 'JetBrains Mono', monospace;
  cursor: pointer;
  transition: all .25s;
  margin-top: 1.5rem;
}

.btn-primary:hover {
  filter: brightness(1.1);
  box-shadow: 0 0 32px rgba(6, 182, 212, .4);
}

.btn-primary:disabled {
  opacity: .4;
  cursor: not-allowed;
  filter: none;
  box-shadow: none;
}

/* ── Link button ─────────────────────────────────────────────────────────── */
.link-btn {
  background: none;
  border: none;
  padding: 0;
  color: var(--cyan);
  font: inherit;
  cursor: pointer;
  text-decoration: underline;
}

.link-btn:hover {
  color: #fff;
}

/* ── Messages ────────────────────────────────────────────────────────────── */
.msg {
  padding: .75rem 1rem;
  margin-top: 1rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: .72rem;
  border-left: 2px solid transparent;
  display: none;
  line-height: 1.5;
}

.msg.error {
  border-color: var(--red);
  color: #fca5a5;
  background: rgba(239, 68, 68, .07);
  display: block;
}

.msg.success {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(6, 182, 212, .07);
  display: block;
}

.msg.info {
  border-color: #a78bfa;
  color: #c4b5fd;
  background: rgba(167, 139, 250, .07);
  display: block;
}

.msg .link-btn {
  font-family: 'JetBrains Mono', monospace;
  font-size: inherit;
}

/* ── Dot ─────────────────────────────────────────────────────────────────── */
.dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  display: inline-block;
  animation: pulse 2s ease infinite;
}

@keyframes pulse {

  0%,
  100% {
    opacity: 1;
    box-shadow: 0 0 0 0 rgba(6, 182, 212, .5);
  }

  50% {
    opacity: .6;
    box-shadow: 0 0 0 4px transparent;
  }
}

/* ══════════════════════════════════════════════════════════════ */
/*  SIGNUP SCREEN                                                 */
/* ══════════════════════════════════════════════════════════════ */
.signup-screen {
  align-items: flex-start;
}

.signup-wrap {
  width: 100%;
  max-width: 600px;
  margin: 0 auto;
  padding: 0 0 3rem;
  animation: fadeUp .55s cubic-bezier(.16, 1, .3, 1) both;
}

.signup-header {
  display: flex;
  align-items: flex-end;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

/* ── Step card ───────────────────────────────────────────────────────────── */
.step-card {
  border: 1px solid var(--border);
  background: rgba(10, 22, 40, .7);
  margin-bottom: 1px;
}

.step-header {
  display: flex;
  align-items: center;
  padding: 1.25rem 1.75rem;
  border-bottom: 1px solid var(--border);
  gap: 0;
}

.step-badge {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .6rem;
  font-weight: 700;
  letter-spacing: .05em;
  border: 1px solid var(--border);
  color: var(--dim);
}

.step-badge.active {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(6, 182, 212, .08);
}

.step-badge.done {
  border-color: var(--green);
  color: var(--green);
  background: rgba(16, 185, 129, .08);
}

.step-line {
  flex: 1;
  height: 1px;
  background: var(--border);
  margin: 0 .75rem;
}

.step-line.active {
  background: linear-gradient(to right, var(--cyan), var(--border));
}

.step-body {
  padding: 1.75rem;
}

.step-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: .3rem;
}

.step-sub {
  font-size: .68rem;
  color: var(--dim);
  letter-spacing: .04em;
  margin-bottom: 0;
}

/* ── Google chip ─────────────────────────────────────────────────────────── */
.google-chip {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: .9rem 1.1rem;
  margin-top: 1rem;
  border: 1px solid rgba(16, 185, 129, .25);
  background: rgba(16, 185, 129, .04);
}

.google-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--cyan), #0891b2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: .8rem;
  color: #000;
  flex-shrink: 0;
}

.google-info {
  flex: 1;
}

.google-name {
  font-weight: 600;
  color: #fff;
  font-size: .875rem;
}

.google-email {
  font-size: .62rem;
  color: var(--dim);
  margin-top: .1rem;
  letter-spacing: .04em;
  font-family: 'JetBrains Mono', monospace;
}

.google-check {
  color: var(--green);
  font-size: 1rem;
  font-weight: 700;
}

/* ── Form ────────────────────────────────────────────────────────────────── */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .9rem;
  margin-top: 1.5rem;
}

.form-grid .full {
  grid-column: 1 / -1;
}

.field {
  display: flex;
  flex-direction: column;
  gap: .35rem;
}

.field label {
  font-family: 'JetBrains Mono', monospace;
  font-size: .58rem;
  letter-spacing: .18em;
  color: var(--dim);
  text-transform: uppercase;
}

.req {
  color: var(--cyan);
}

.field input,
.field select {
  background: rgba(10, 18, 38, .9);
  border: 1px solid var(--border);
  color: #e2e8f0;
  padding: .65rem .9rem;
  font-size: .875rem;
  font-family: inherit;
  outline: none;
  transition: border-color .2s;
  width: 100%;
  appearance: none;
  -webkit-appearance: none;
}

.field input:focus,
.field select:focus {
  border-color: var(--cyan);
}

.field input[readonly] {
  opacity: .6;
  cursor: default;
  background: rgba(6, 182, 212, .03);
  border-color: rgba(6, 182, 212, .15);
}

.field select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2306b6d4' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right .75rem center;
  padding-right: 2.5rem;
  cursor: pointer;
}

.field select option {
  background: #0a1628;
}

.field-note {
  font-size: .6rem;
  color: var(--green);
  letter-spacing: .05em;
  font-family: 'JetBrains Mono', monospace;
}

.gender-toggle {
  display: inline-flex;
  gap: .4rem;
}

.gender-pill {
  padding: .4rem .85rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(15, 23, 42, .9);
  color: var(--dim);
  font-family: 'JetBrains Mono', monospace;
  font-size: .6rem;
  letter-spacing: .15em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background .2s, color .2s, border-color .2s, box-shadow .2s, transform .1s;
}

.gender-pill.active {
  background: var(--cyan);
  color: #020617;
  border-color: var(--cyan);
  box-shadow: 0 0 0 1px rgba(6, 182, 212, .4);
}

.gender-pill:active {
  transform: translateY(1px);
}

/* ── Responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 540px) {
  .choice-row {
    grid-template-columns: 1fr;
  }

  .hero-title {
    font-size: 3rem;
  }

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

  .form-grid .full {
    grid-column: 1;
  }

  .step-body {
    padding: 1.25rem;
  }

  .signup-header {
    flex-direction: column;
    align-items: flex-start;
  }
}