:root {
  --c1: #7c3aed;
  --c2: #ec4899;
  --c3: #06b6d4;
  --c4: #fbbf24;
  --bg: #05060f;
  --panel: rgba(255,255,255,0.04);
  --panel-border: rgba(255,255,255,0.08);
  --text: #f1f3f9;
  --muted: #7b84a0;
  --danger: #ff6b81;
}

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

html, body {
  height: 100%;
}

body {
  font-family: 'Plus Jakarta Sans', sans-serif;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
  padding: 48px 16px 70px;
  position: relative;
  overflow-x: hidden;
}

.blob {
  position: fixed;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.35;
  z-index: 0;
  pointer-events: none;
}

.blob1 {
  width: 420px;
  height: 420px;
  background: var(--c1);
  top: -120px;
  left: -100px;
  animation: float1 14s ease-in-out infinite;
}

.blob2 {
  width: 380px;
  height: 380px;
  background: var(--c3);
  bottom: -140px;
  right: -100px;
  animation: float2 16s ease-in-out infinite;
}

.blob3 {
  width: 300px;
  height: 300px;
  background: var(--c2);
  top: 40%;
  left: 50%;
  animation: float3 18s ease-in-out infinite;
}

@keyframes float1 {
  0%, 100% { transform: translate(0,0) scale(1); }
  50% { transform: translate(60px,40px) scale(1.1); }
}

@keyframes float2 {
  0%, 100% { transform: translate(0,0) scale(1); }
  50% { transform: translate(-50px,-30px) scale(1.15); }
}

@keyframes float3 {
  0%, 100% { transform: translate(-50%,-50%) scale(1); }
  50% { transform: translate(-50%,-50%) scale(1.2) rotate(20deg); }
}

.noise {
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='100' height='100'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.025'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 1;
}

.container {
  position: relative;
  z-index: 2;
  max-width: 820px;
  margin: 0 auto;
  animation: fadeUp .7s cubic-bezier(.2,.8,.2,1) both;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.badge {
  display: flex;
  justify-content: center;
  margin-bottom: 18px;
}

.badge span {
  font-size: 0.72em;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  padding: 6px 16px;
  border-radius: 30px;
  background: linear-gradient(95deg, rgba(124,58,237,0.18), rgba(236,72,153,0.18));
  border: 1px solid rgba(255,255,255,0.12);
  color: #d8d4ff;
}

/* DEVNTRIC ICON — fixed to be small on ALL screen sizes, not just mobile */
.devntric-icon {
  display: block;
  width: 50px;
  height: 80px;
  max-width: 40px;
  max-height: 40px;
  object-fit: cover;
  object-position: 15% center;
  border-radius: 10px;
  mix-blend-mode: screen;
  margin: 0 auto 8px;
}

h1 {
  font-family: 'Space Grotesk', sans-serif;
  text-align: center;
  font-size: clamp(1.8em, 6vw, 3em); /* Mobile standard er jonno clamp dynamic kora hoyeche */
  font-weight: 700;
  letter-spacing: -1.5px;
  line-height: 1.1;
  background: linear-gradient(100deg, #fff 10%, var(--c3) 40%, var(--c1) 65%, var(--c2) 90%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  background-size: 300% auto;
  animation: shine 8s ease-in-out infinite;
  margin-bottom: 10px;
}

@keyframes shine {
  0%, 100% { background-position: 0% center; }
  50% { background-position: 100% center; }
}

p.subtitle {
  text-align: center;
  color: var(--muted);
  font-size: 0.95em;
  margin-bottom: 30px;
  padding: 0 8px;
}

/* TABS */
.tabs-bar {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 4px 2px 14px;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch; /* Smooth mobile scroll er jonno */
}

.tabs-bar::-webkit-scrollbar {
  height: 5px;
}

.tabs-bar::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.15);
  border-radius: 10px;
}

.sem-tab {
  flex: 0 0 auto;
  padding: 10px 16px;
  border-radius: 14px;
  background: rgba(255,255,255,0.035);
  border: 1px solid rgba(255,255,255,0.08);
  color: var(--muted);
  font-weight: 600;
  font-size: 0.85em;
  cursor: pointer;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all .2s ease;
  position: relative;
}

.sem-tab:hover {
  background: rgba(255,255,255,0.06);
  color: var(--text);
}

.sem-tab.active {
  background: linear-gradient(100deg, rgba(124,58,237,0.25), rgba(6,182,212,0.2));
  border-color: rgba(124,58,237,0.45);
  color: #fff;
  box-shadow: 0 4px 18px rgba(124,58,237,0.25);
}

.sem-tab .sem-gpa-chip {
  font-size: 0.82em;
  color: #5eead4;
  font-weight: 700;
}

.sem-tab .sem-del {
  color: var(--danger);
  font-size: 1.1em;
  line-height: 1;
  opacity: 0.55;
  margin-left: 2px;
  transition: opacity .2s ease, transform .2s ease;
}

.sem-tab .sem-del:hover {
  opacity: 1;
  transform: scale(1.2);
}

.add-sem-tab {
  flex: 0 0 auto;
  padding: 10px 16px;
  border-radius: 14px;
  background: rgba(94,234,212,0.08);
  border: 1px dashed rgba(94,234,212,0.35);
  color: #5eead4;
  font-weight: 700;
  font-size: 0.85em;
  cursor: pointer;
  white-space: nowrap;
  transition: all .2s ease;
}

.add-sem-tab:hover {
  background: rgba(94,234,212,0.16);
}

.card {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 24px;
  padding: 26px 24px 22px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  margin-bottom: 24px;
  position: relative;
  box-shadow: 0 20px 60px rgba(0,0,0,0.4), inset 0 1px 0 rgba(255,255,255,0.06);
}

.card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 24px;
  padding: 1px;
  background: linear-gradient(135deg, rgba(124,58,237,0.4), transparent 30%, transparent 70%, rgba(6,182,212,0.4));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.sem-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.sem-name-input {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.15em;
  font-weight: 700;
  background: transparent;
  border: none;
  color: #fff;
  padding: 4px 2px;
  border-bottom: 1px dashed rgba(255,255,255,0.15);
  min-width: 160px;
}

.sem-name-input:focus {
  outline: none;
  border-color: var(--c3);
}

.sem-gpa-pill {
  font-size: 0.8em;
  font-weight: 700;
  color: #5eead4;
  background: rgba(94,234,212,0.1);
  border: 1px solid rgba(94,234,212,0.25);
  padding: 5px 14px;
  border-radius: 30px;
}

/* MODE TOGGLE */
.mode-toggle {
  display: flex;
  gap: 6px;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 13px;
  padding: 4px;
  margin-bottom: 18px;
  width: fit-content;
}

.mode-btn {
  border: none;
  background: transparent;
  color: var(--muted);
  font-family: 'Plus Jakarta Sans',sans-serif;
  font-weight: 700;
  font-size: 0.78em;
  letter-spacing: 0.2px;
  padding: 8px 14px;
  border-radius: 9px;
  cursor: pointer;
  transition: all .2s ease;
}

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

.mode-btn.active {
  background: linear-gradient(100deg, rgba(124,58,237,0.35), rgba(6,182,212,0.28));
  color: #fff;
  box-shadow: 0 3px 10px rgba(124,58,237,0.25);
}

.quick-fields {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 6px;
}

.quick-field-group label {
  display: block;
  font-size: 0.7em;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 700;
  margin-bottom: 8px;
}

.quick-hint {
  margin-top: 10px;
  font-size: 0.78em;
  color: var(--muted);
  line-height: 1.6;
}

.table-head {
  display: grid;
  grid-template-columns: 2fr 1fr 1.2fr 44px; /* Layout fluid kora hoyeche squish bondho korte */
  gap: 10px;
  padding: 0 4px 10px;
}

.table-head span {
  font-size: 0.7em;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 700;
}

.course-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.course-row {
  display: grid;
  grid-template-columns: 2fr 1fr 1.2fr 44px;
  gap: 10px;
  align-items: center;
  animation: rowIn .4s cubic-bezier(.2,.85,.3,1.2) both;
}

@keyframes rowIn {
  from { opacity: 0; transform: translateX(-12px) scale(.97); }
  to { opacity: 1; transform: translateX(0) scale(1); }
}

.course-row.removing {
  animation: rowOut .28s ease forwards;
}

@keyframes rowOut {
  to { opacity: 0; transform: translateX(24px) scale(.94); }
}

input, select {
  width: 100%;
  padding: 12px 10px; /* Mobile dynamic touch capability ready */
  border-radius: 13px;
  border: 1px solid rgba(255,255,255,0.09);
  background: rgba(255,255,255,0.035);
  color: var(--text);
  font-size: 0.9em;
  font-family: 'Plus Jakarta Sans',sans-serif;
  font-weight: 500;
  transition: border-color .22s ease, background .22s ease, box-shadow .22s ease, transform .15s ease;
}

input::placeholder {
  color: #4b5571;
}

input:hover, select:hover {
  background: rgba(255,255,255,0.06);
}

input:focus, select:focus {
  outline: none;
  border-color: var(--c3);
  box-shadow: 0 0 0 4px rgba(6,182,212,0.14);
  background: rgba(255,255,255,0.07);
  transform: translateY(-1px);
}

select {
  cursor: pointer;
}

select option {
  background: #11132a;
  color: var(--text);
}

.remove-btn {
  background: rgba(255,107,129,0.1);
  border: 1px solid rgba(255,107,129,0.25);
  color: var(--danger);
  border-radius: 12px;
  width: 100%; /* Column grid anujayi perfect square hobe */
  height: 38px;
  cursor: pointer;
  font-size: 1.2em;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all .22s cubic-bezier(.3,.6,.3,1.4);
}

.remove-btn:hover {
  background: rgba(255,107,129,0.22);
  transform: rotate(90deg) scale(1.08);
}

.btn-row {
  display: flex;
  gap: 12px;
  margin-top: 20px;
  flex-wrap: wrap;
}

button.action {
  position: relative;
  overflow: hidden;
  flex: 1;
  min-width: 140px;
  padding: 14px 16px;
  border-radius: 14px;
  border: none;
  font-size: 0.93em;
  font-weight: 700;
  font-family: 'Plus Jakarta Sans',sans-serif;
  letter-spacing: 0.2px;
  cursor: pointer;
  transition: transform .18s cubic-bezier(.3,.6,.3,1.4), box-shadow .25s ease, opacity .2s ease;
}

button.action::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.3);
  transform: scale(0);
  border-radius: 50%;
  opacity: 0;
  transition: transform .5s ease, opacity .6s ease;
}

button.action:active::after {
  transform: scale(3);
  opacity: 1;
  transition: 0s;
}

button.action:active {
  transform: scale(0.96);
}

button.action:hover {
  transform: translateY(-2px);
}

#addRowBtn {
  background: rgba(6,182,212,0.12);
  border: 1px solid rgba(6,182,212,0.32);
  color: #5eead4;
}

#addRowBtn:hover {
  box-shadow: 0 8px 24px rgba(6,182,212,0.22);
}

#calcBtn {
  background: linear-gradient(100deg, var(--c1), var(--c2));
  color: #fff;
  box-shadow: 0 8px 28px rgba(124,58,237,0.35);
}

#calcBtn:hover {
  box-shadow: 0 12px 34px rgba(236,72,153,0.4);
}

#resetBtn {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.12);
  color: var(--text);
}

#resetBtn:hover {
  background: rgba(255,255,255,0.09);
}

/* RESULT */
.result {
  text-align: center;
  padding: 38px 24px 30px;
  overflow: hidden;
}

.result.show {
  animation: popIn .55s cubic-bezier(.2,.85,.25,1.25) both;
}

@keyframes popIn {
  from { opacity: 0; transform: scale(.9) translateY(12px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.ring-wrap {
  position: relative;
  width: 200px;
  height: 200px;
  margin: 0 auto 14px;
}

.ring-wrap svg {
  transform: rotate(-90deg);
  width: 100%;
  height: 100%;
}

.ring-bg {
  fill: none;
  stroke: rgba(255,255,255,0.06);
  stroke-width: 10;
}

.ring-fill {
  fill: none;
  stroke: url(#ringGrad);
  stroke-width: 10;
  stroke-linecap: round;
  stroke-dasharray: 534;
  stroke-dashoffset: 534;
  transition: stroke-dashoffset 1.1s cubic-bezier(.2,.8,.2,1);
  filter: drop-shadow(0 0 8px rgba(124,58,237,0.5));
}

.ring-center {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.ring-center .value {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 2.6em;
  font-weight: 700;
  background: linear-gradient(100deg, var(--c3), var(--c1), var(--c2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1;
}

.ring-center .scale {
  font-size: 0.72em;
  color: var(--muted);
  margin-top: 4px;
  font-weight: 600;
}

.result-label {
  color: var(--muted);
  font-size: 0.95em;
  font-weight: 500;
  margin-bottom: 4px;
}

.grade-tag {
  display: inline-block;
  margin-top: 6px;
  padding: 5px 16px;
  border-radius: 30px;
  font-size: 0.78em;
  font-weight: 700;
  letter-spacing: 0.5px;
  background: linear-gradient(95deg, rgba(124,58,237,0.2), rgba(6,182,212,0.2));
  border: 1px solid rgba(255,255,255,0.12);
}

.summary {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 26px;
  flex-wrap: wrap;
}

.summary .stat {
  background: rgba(255,255,255,0.035);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 16px;
  padding: 14px 20px;
  flex: 1;
  min-width: 105px;
  transition: transform .2s ease, background .2s ease;
}

.summary .stat:hover {
  transform: translateY(-3px);
  background: rgba(255,255,255,0.06);
}

.summary .num {
  font-size: 1.4em;
  font-weight: 700;
  font-family: 'Space Grotesk', sans-serif;
}

.summary .lbl {
  font-size: 0.74em;
  color: var(--muted);
  margin-top: 3px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.sem-breakdown {
  margin-top: 26px;
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sem-breakdown-title {
  text-align: center;
  font-size: 0.75em;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--muted);
  font-weight: 700;
  margin-bottom: 6px;
}

.sem-bd-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.07);
  border-radius: 12px;
  padding: 10px 16px;
  font-size: 0.88em;
  gap: 8px;
}

.sem-bd-row .sname {
  font-weight: 600;
  color: #e7e9f5;
}

.sem-bd-row .sdetail {
  color: var(--muted);
  font-size: 0.85em;
}

.sem-bd-row .sgpa {
  font-weight: 700;
  color: #5eead4;
  font-family: 'Space Grotesk',sans-serif;
}

.scale-note {
  text-align: center;
  color: var(--muted);
  font-size: 0.78em;
  line-height: 1.7;
  margin-top: 6px;
  opacity: 0.75;
}

/* GRADE SCALE TABLE */
.grade-scale-card {
  padding: 22px 20px 24px;
}

.grade-scale-title {
  text-align: center;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1em;
  font-weight: 700;
  color: #e7e9f5;
  margin-bottom: 16px;
  letter-spacing: 0.3px;
}

.grade-scale-table {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 10px;
}

.grade-cell {
  background: rgba(255,255,255,0.035);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 14px;
  padding: 12px 6px;
  text-align: center;
  transition: transform .2s ease, background .2s ease, border-color .2s ease;
}

.grade-cell:hover {
  transform: translateY(-3px);
  background: rgba(255,255,255,0.06);
  border-color: rgba(124,58,237,0.35);
}

.grade-cell .gletter {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.15em;
  font-weight: 700;
  background: linear-gradient(100deg, var(--c3), var(--c1));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.grade-cell .gpoint {
  font-size: 0.74em;
  color: var(--muted);
  margin-top: 3px;
  font-weight: 600;
}

/* FOOTER */
.site-footer {
  text-align: center;
  margin-top: 34px;
  padding-top: 22px;
  border-top: 1px solid rgba(255,255,255,0.07);
}

.site-footer .brand-link {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.05em;
  font-weight: 700;
  text-decoration: none;
  background: linear-gradient(100deg, var(--c3), var(--c1), var(--c2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  background-size: 200% auto;
  transition: background-position .4s ease;
}

.site-footer .brand-link:hover {
  background-position: 100% center;
}

.site-footer .dev-credit {
  margin-top: 6px;
  font-size: 0.78em;
  color: var(--muted);
  letter-spacing: 0.3px;
}

.site-footer .dev-credit span {
  color: #cfd3ec;
  font-weight: 600;
}

/* SMART MEDIA QUERIES (FOR MOBILE RESPONSIVENESS) */
@media(max-width: 600px) {
  body {
    padding: 24px 12px 60px; /* Outer spacing ta komanor jonno */
  }

  .card {
    padding: 20px 14px 16px;
    border-radius: 20px;
  }
  
  .card::before {
    border-radius: 20px;
  }

  /* Table head full display structure block kore dynamic row visualization kora hoyeche */
  .table-head {
    display: none; /* Mobile e standard list layout better experience dibe */
  }

  .course-row {
    grid-template-columns: 1fr 1fr 44px;
    grid-template-rows: auto auto;
    gap: 8px;
    background: rgba(255,255,255,0.02);
    padding: 12px;
    border-radius: 14px;
    border: 1px solid rgba(255,255,255,0.04);
  }

  /* First input span block pure full width nibe area control ar jonno */
  .course-row input[type="text"] {
    grid-column: span 2;
    font-size: 0.95em;
  }

  /* Select and second input row automatic flex line base balanced */
  .course-row input[type="number"],
  .course-row select {
    grid-column: span 1;
  }

  .remove-btn {
    grid-column: 3;
    grid-row: 1 / span 2;
    height: 100%;
    min-height: 44px;
  }

  .devntric-icon {
    width: 50px;
    height: 50px;
  }

  .quick-fields {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .ring-wrap {
    width: 160px;
    height: 160px;
  }

  .ring-center .value {
    font-size: 2.2em;
  }

  .grade-scale-table {
    grid-template-columns: repeat(4, 1fr);
    gap: 6px;
  }
  
  button.action {
    width: 100%; /* Mobile automatic sequential action view wrap block */
  }
}

@media(max-width: 400px) {
  .grade-scale-table {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .sem-card-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  
  .sem-name-input {
    width: 100%;
  }
}