html, body {
  margin: 0;
  padding: 0;
  font-family: Arial, Helvetica, sans-serif;
}

#header {
  position: sticky;
  top: 0;
  z-index: 100;

  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(0px);
  border-bottom: 2px solid #e5e5e5;

  transition:
    backdrop-filter 0.25s ease,
    border-color 0.25s ease,
    background  0.25s ease;
}

.header-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;

  padding: 20px 120px;
  transition: padding 0.25s ease;
}

#header.sticky {
  backdrop-filter: blur(8px);
  border-bottom: 2px solid rgb(116, 177, 218);
  background: rgb(90, 169, 223);
}

#header.sticky .header-bar {
  padding: 12px 120px;
}


.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 30px;
}

.logo {
  height: 75px;
  margin-right: 8px;
  filter: brightness(0.94);

}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn {
  height: 44px;
  padding: 0 20px;

  display: inline-flex;
  align-items: center;
  justify-content: center;

  border-radius: 10px;
  font-size: 15.5px;
  font-weight: 500;

  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
  background: rgb(58, 105, 233);
  border-width: 0px;

  transition:
    border-color 0.2s ease;
}





.btn.ghost {
  background:
    linear-gradient(#f9f9f9, #e6e6e6);
  box-shadow:
    inset 0 0 0 1px rgba(255,255,255,0.6),
    inset 0 0 0 2px rgba(0,0,0,0.03);
  color: #111;

}

.btn1 {
  height: 44px;
  padding: 0 20px;

  display: inline-flex;
  align-items: center;
  justify-content: center;

  border-radius: 10px;
  font-size: 15.5px;
  font-weight: 500;

  text-decoration: none;
  white-space: nowrap;
  background: rgb(58, 105, 233);

}

.btn1.ghost {
  background:
    linear-gradient(#f9f9f9, #e6e6e6);
  box-shadow:
    inset 0 0 0 1px rgba(255,255,255,0.6),
    inset 0 0 0 2px rgba(0,0,0,0.03);
  color: #111;

}

.btn1.ghost.study-download {
  cursor: pointer;
}

.btn:hover {
  background: #f9f9f9;
  border-color: #d4d4d4;
}


.bottom-bar {
  width: 100%;
  background: #efe7c0;
  padding: 16px 0;
}

.bottom-bar-content {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
}

.bottom-bar-logo {
  width: 38px;
  height: 38px;
  object-fit: contain;
}

.bottom-bar-text {
  font-size: 14px;
  color: #1b1b1b;
  font-weight: 500;
}

.landing-card {
  background: rgba(90,169,223,0.95);
  border: 1px solid #e5e5e5;
  border-radius: 20px;
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.6),
    inset 0 -1px 0 rgba(0,0,0,0.04);
  color: white;
  min-height: 340px;
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 16px;
}

.landing-card h3 {
  margin: 0;
  font-size: 21px;
  font-weight: 600;
}

.landing-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  font-weight: 500;
  color: #1b1b1b;
  white-space: pre-line;

}

.landing-card.hero-card {
  --side-block: clamp(280px, 44%, 520px);

  position: relative;
  overflow: hidden;

  padding: 0;
  display: block;

  color: white;
  background: rgba(90,169,223,0.95);
}

.hero-card .hero-text {
  position: absolute;
  top: 50%;
  right: 32px;
  transform: translateY(-50%);

  max-width: 31%;

  display: flex;
  flex-direction: column;
  gap: 16px;
}

.landing {
  padding: 55px 120px;
}

.landing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.landing-card.span-2 {
  grid-column: span 2;
}

.countdown {
  display: flex;
  gap: 16px;
  margin-top: 12px;
}

.countdown span {
  font-size: 13px;
  color: #1b1b1b;
}

.countdown strong {
  font-size: 18px;
  font-weight: 700;
}


.landing-split {
  margin-top: 60px;
  margin-bottom: 50px;
  display: grid;
  grid-template-columns: 3.3fr 1.6fr;
  gap: 32px;
  width: 100%;
}

.split-block {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding-left: 5px;
  padding-right: 5px;

}
.split-block > div {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.split-block h3 {
  margin: 0;
  font-size: 20px;
  font-weight: 600;
  color: #111;
}

.split-block h3::after {
  content: "";
  display: block;
  width: 100%;
  height: 3px;
  margin-top: 8px;
  background: rgb(90,169,223);
}

.split-block p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: #444;
}

.account-wrapper {
  padding: 40px 20px;
}

.account-container {
  margin: 0 auto;
  padding-left: 100px;
  padding-right: 100px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

/* FORM SPACING */
.auth-box {
  display: flex;
  flex-direction: column;
  gap: 16px; /* spacing */
}

/* INPUT */
.auth-box input {
  padding: 14px 16px;

  border: 2px solid #d0d5dd;
  border-radius: 10px;

  background: #ffffff;
  color: #111;

  font-size: 14px;
  transition: border 0.2s, box-shadow 0.2s;
}

/* FOCUS */
.auth-box input:focus {
  outline: none;
  border-color: #888;

}


/* SWITCH TEXT */
.switch {
  font-size: 14px;
}

.switch button {
  background: none;
  border: none;
  color: #888;
  cursor: pointer;
  font-size: 14px;

}

/* RIGHT */
.form-container {
  width: 100%;
  max-width: 630px;
  height: 950px;

  border-radius: 12px;
  overflow: hidden;
}

.form-container iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.hidden {
  display: none;
}


.file-box {
  position: relative;
  width: 220px;
  height: 220px;

  border: 1px solid #d0d5dd;
  border-radius: 12px;
  overflow: hidden;

  background: #f9fafb;
}

/* input on top but invisible */
.file-box input {
  position: absolute;
  inset: 0;

  opacity: 0;
  cursor: pointer;
  z-index: 2;
}

/* preview */
.avatar-preview {
  position: absolute;
  inset: 0;

  width: 100%;
  height: 100%;
  object-fit: cover;

  z-index: 1;
}

/* placeholder */
.file-placeholder {
  position: absolute;
  inset: 0;

  display: flex;
  align-items: center;
  justify-content: center;

  color: #666;
  font-size: 14px;

  z-index: 0;
}

.action-row {
  display: grid;
  grid-template-columns: 1fr 1fr; /* equal split */
  gap: 12px; /* gap */
  width: 100%;
  transform: translateY(16px);

}

.action-row .btn {
  width: 100%;
}

.members-wrapper {
  max-width: 1240px;
  margin: 40px auto;
  padding: 0 20px;
}

.members-container {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.members-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

/* member item */
.member {
  text-align: center;
  max-width: 200px;
}

.member img {
  width: 200px;
  height: 200px;
  border-radius: 10%;
  object-fit: cover;

  margin-bottom: 8px;
}

.member-name {
  font-weight: 500;
}

.member-title {
  font-size: 13px;
  font-style: italic;
  color: #666;
}

.member-group > h2::after {
  content: "";
  display: block;
  width: 100%;
  height: 3px;
  margin-top: 8px;
  background: rgb(90,169,223);
}

.study-wrapper {
  max-width: 1280px;
  margin: 40px auto;
  padding: 0 20px;
}

.study-wrapper > h1::after {
  content: "";
  display: block;
  width: 100%;
  height: 3px;
  margin-top: 8px;
  background: rgb(90,169,223);
}

.study-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* yatay kart */
.study-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  background: rgba(90,169,223,0.95);
  border: 1px solid #e5e5e5;
  border-radius: 20px;
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.6),
    inset 0 -1px 0 rgba(0,0,0,0.04);
}

/* sol taraf */
.study-info {
  max-width: 70%;
}

.study-name {
  font-weight: 600;
  margin-bottom: 4px;
  color: white;
}

.study-desc {
  font-size: 14px;
}