* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  font-family: 'Segoe UI', Tahoma, Arial, sans-serif;
  min-height: 100vh;
  overflow-x: hidden;
}
.screen { display: none; min-height: 100vh; }
.screen.active { display: block; }

/* ===================== LOGIN SCREEN ===================== */
#login-screen {
  background: #f3f5f7;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.banner {
  position: relative;
  background: linear-gradient(115deg, #16324f 0%, #1a5f5a 45%, #17a589 100%);
  padding: 28px 5% 14px;
  overflow: hidden;
}
.banner-bg { position: absolute; inset: 0; overflow: hidden; }
.ghost-text {
  position: absolute;
  font-weight: 800;
  color: rgba(255,255,255,0.06);
  white-space: nowrap;
  user-select: none;
}
.ghost-1 { font-size: 120px; left: 2%; top: -10px; }
.ghost-2 { font-size: 90px; right: 4%; bottom: -30px; }
.banner-lines { position: absolute; inset: 0; width: 100%; height: 100%; }

.banner-content { position: relative; display: flex; justify-content: center; }
.banner-panel {
  background: rgba(255,255,255,0.12);
  backdrop-filter: blur(2px);
  border-radius: 10px;
  padding: 14px 22px;
  display: flex;
  align-items: center;
  gap: 16px;
  max-width: 90%;
}
.banner-title {
  color: #fff;
  font-size: clamp(16px, 2.4vw, 24px);
  font-weight: 700;
}
.banner-logo { height: clamp(40px, 6vw, 60px); }

.banner-subtitle {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: rgba(255,255,255,0.85);
  font-size: 13px;
  margin-top: 18px;
}
.banner-subtitle .dash { width: 40px; height: 1px; background: rgba(255,255,255,0.5); }

.login-main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 16px;
}
.login-card {
  background: #fff;
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(20, 40, 60, 0.08);
  padding: 36px 34px;
  width: 100%;
  max-width: 380px;
}
.login-card h1 {
  color: #16324f;
  font-size: 22px;
  margin: 0 0 24px;
  text-align: right;
}
.login-card label {
  display: block;
  font-size: 13px;
  color: #16324f;
  margin-bottom: 6px;
  font-weight: 600;
}
.login-card input {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid #dbe1e6;
  border-radius: 8px;
  font-size: 14px;
  margin-bottom: 18px;
  outline: none;
  transition: border-color .15s;
  font-family: inherit;
}
.login-card input:focus { border-color: #17a589; }

.btn-primary {
  width: 100%;
  background: #16324f;
  color: #fff;
  border: none;
  padding: 13px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s;
}
.btn-primary:hover { background: #0f2338; }

.login-error-msg {
  color: #d32f2f;
  background: #fdecea;
  border: 1px solid #f5c6cb;
  border-radius: 6px;
  padding: 8px 10px;
  font-size: 13px;
  margin: -6px 0 16px;
  text-align: center;
}

.forgot-link {
  display: block;
  text-align: center;
  margin-top: 18px;
  font-size: 13px;
  color: #2563eb;
  text-decoration: none;
}
.forgot-link:hover { text-decoration: underline; }

.login-footer {
  text-align: center;
  font-size: 12px;
  color: #8b95a1;
  border-top: 1px solid #e8ebee;
  padding: 16px 10px;
}

.corner-bubble {
  position: fixed;
  bottom: 16px;
  left: 16px;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 2px solid #17a589;
  opacity: 0.5;
}

/* ===================== DASHBOARD ===================== */
.desktop {
  position: relative;
  min-height: 100vh;
  background: linear-gradient(160deg, #14607e 0%, #2c8f8a 45%, #a9dcc0 85%, #d8ecc9 100%);
  overflow: hidden;
}

.desktop-logo {
  position: absolute;
  top: 50%;
  right: 10%;
  transform: translateY(-50%);
  opacity: 0.95;
  pointer-events: none;
}
.desktop-logo img {
  width: clamp(160px, 22vw, 320px);
  filter: drop-shadow(0 6px 14px rgba(0,0,0,0.15));
}

.desktop-icons {
  position: absolute;
  top: 18px;
  left: 14px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  z-index: 5;
}
.desk-icon {
  background: none;
  border: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 70px;
  cursor: pointer;
  padding: 4px;
  border-radius: 6px;
}
.desk-icon:hover, .desk-icon:focus { background: rgba(255,255,255,0.18); outline: none; }
.icon-glyph { width: 30px; height: 30px; display: inline-block; margin-bottom: 4px; }
.icon-glyph svg { width: 100%; height: 100%; }
.icon-label {
  font-size: 11px;
  color: #10202b;
  text-align: center;
  line-height: 1.3;
  text-shadow: 0 1px 1px rgba(255,255,255,0.4);
}

/* taskbar */
.taskbar {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  height: 40px;
  background: linear-gradient(#2b2f36, #14171b);
  z-index: 20;
  border-top: 1px solid #000;
}
.start-btn {
  position: absolute;
  left: 6px;
  top: 50%;
  transform: translateY(-50%);
  background: linear-gradient(#3a3f47, #202327);
  border: 1px solid #000;
  color: #fff;
  border-radius: 4px;
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}
.start-btn:hover { background: linear-gradient(#484d56, #2a2d31); }
.start-dot {
  width: 12px; height: 12px; border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #ff6b5e, #b3261e);
  display: inline-block;
}
.taskbar-info {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: #cfd6dc;
  font-size: 12px;
}

/* start menu */
.start-menu {
  position: fixed;
  bottom: 40px;
  left: 6px;
  width: 300px;
  max-width: 90vw;
  background: #3f4550;
  border: 1px solid #000;
  border-radius: 4px 4px 0 0;
  box-shadow: 0 6px 20px rgba(0,0,0,0.4);
  z-index: 30;
  display: none;
  overflow: hidden;
}
.start-menu.open { display: block; }
.start-menu-header {
  background: linear-gradient(#4a90c4, #2f6ba0);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  padding: 6px 10px;
}
.start-menu-body { display: flex; min-height: 160px; }
.start-menu-left {
  background: #2c313a;
  width: 40%;
  padding: 8px 0;
}
.start-menu-right {
  background: #454b56;
  width: 60%;
  padding: 8px 0;
}
.start-menu-item {
  color: #e8ecf0;
  font-size: 13px;
  padding: 8px 12px;
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
}
.start-menu-item:hover { background: rgba(255,255,255,0.1); }
.start-menu-item .arrow { margin-inline-start: auto; opacity: 0.6; }
.start-menu-right hr { border: none; border-top: 1px solid rgba(255,255,255,0.15); margin: 6px 10px; }

/* popup windows */
.popup-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.35);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 50;
  padding: 16px;
}
.popup-overlay.open { display: flex; }

.win-popup {
  display: none;
  background: #f2f2f2;
  border: 1px solid #6b6f76;
  border-radius: 4px;
  width: 100%;
  max-width: 560px;
  box-shadow: 0 12px 40px rgba(0,0,0,0.4);
  overflow: hidden;
}
.win-popup.open { display: block; }

.win-titlebar {
  background: linear-gradient(#4a90c4, #2f6ba0);
  color: #fff;
  padding: 6px 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  font-weight: 600;
}
.win-titlebar-error { background: linear-gradient(#c0392b, #8e2318); }
.win-controls { display: flex; gap: 4px; }
.win-btn {
  width: 20px; height: 18px;
  background: rgba(255,255,255,0.15);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  border-radius: 2px;
  cursor: pointer;
}
.win-btn:hover { background: rgba(255,255,255,0.3); }
.win-close:hover { background: #d9534f; }

.win-body { background: #fff; padding: 16px; }
.win-row {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px;
  border-radius: 6px;
  margin-bottom: 12px;
}
.welcome-row {
  background: #f7f8fa;
  border-inline-start: 4px solid #3a7bd5;
  justify-content: space-between;
  align-items: center;
}
.notice-row {
  background: #fdecec;
  border-inline-start: 4px solid #d9534f;
}
.win-row:last-child { margin-bottom: 0; }
.win-sub { font-size: 13px; color: #444; margin-top: 2px; }
.win-emoji { font-size: 20px; flex-shrink: 0; }
.notice-emoji { margin-top: 2px; }
.win-row p { margin: 4px 0 0; font-size: 13.5px; line-height: 1.6; color: #2c2c2c; }

.win-academic { max-width: 460px; }
.win-body.scrollable { max-height: 70vh; overflow-y: auto; }

.sem-title {
  color: #16324f;
  font-size: 15px;
  margin: 18px 0 8px;
  padding-bottom: 6px;
  border-bottom: 2px solid #2f6ba0;
}
.grades-header {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: #6b7580;
  font-weight: 600;
  padding: 0 4px 4px;
}
.grade-row {
  display: flex;
  gap: 8px;
  margin-bottom: 6px;
}
.subject-input, .grade-input {
  border: 1px solid #dbe1e6;
  border-radius: 6px;
  padding: 8px 10px;
  font-size: 13px;
  font-family: inherit;
  outline: none;
}
.subject-input { flex: 3; }
.grade-input { flex: 1; text-align: center; }
.subject-input:focus, .grade-input:focus { border-color: #17a589; }

.gpa-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #f7f8fa;
  border-inline-start: 4px solid #3a7bd5;
  border-radius: 6px;
  padding: 10px 12px;
  margin: 14px 0 4px;
}
.gpa-row label { font-size: 13.5px; font-weight: 600; color: #16324f; }
.gpa-input {
  width: 70px;
  text-align: center;
  border: 1px solid #dbe1e6;
  border-radius: 6px;
  padding: 6px 8px;
  font-size: 13px;
  font-family: inherit;
  outline: none;
}
.gpa-input:focus { border-color: #17a589; }
.gpa-year { border-inline-start-color: #17a589; margin-bottom: 4px; }

.fee-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #f7f8fa;
  border-radius: 8px;
  padding: 12px 14px;
  margin-bottom: 10px;
}
.fee-info { display: flex; flex-direction: column; gap: 3px; }
.fee-info strong { color: #16324f; font-size: 14px; }
.fee-amount { color: #444; font-size: 13px; }
.paid-badge {
  background: #e3f6ec;
  color: #1e8e58;
  font-size: 12px;
  font-weight: 700;
  padding: 5px 10px;
  border-radius: 20px;
}
.fee-total-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 4px 4px;
  border-top: 1px solid #e8ebee;
  font-size: 13.5px;
  color: #16324f;
}

.win-error { max-width: 400px; }
.error-body { display: flex; align-items: flex-start; gap: 14px; }
.error-icon { width: 34px; height: 34px; flex-shrink: 0; }
.error-icon svg { width: 100%; height: 100%; }
.error-text strong { display: block; margin-bottom: 6px; color: #8e2318; font-size: 14px; }
.error-text p { margin: 0; font-size: 13.5px; line-height: 1.6; color: #333; }
.win-footer { background: #eee; padding: 10px 16px; text-align: center; border-top: 1px solid #ddd; }
.btn-ok {
  background: #16324f;
  color: #fff;
  border: none;
  padding: 7px 26px;
  border-radius: 4px;
  font-size: 13px;
  cursor: pointer;
}
.btn-ok:hover { background: #0f2338; }

/* ===================== MOBILE ===================== */
@media (max-width: 720px) {
  .banner { padding: 20px 5% 12px; }
  .banner-content { justify-content: center; }
  .banner-panel { flex-direction: row-reverse; justify-content: center; text-align: center; padding: 12px 16px; }
  .ghost-1 { font-size: 70px; }
  .ghost-2 { font-size: 50px; }

  .login-card { padding: 26px 20px; }

  .desktop-logo {
    position: absolute;
    top: auto;
    bottom: 60px;
    right: 50%;
    transform: translateX(50%);
    opacity: 0.5;
  }
  .desktop-logo img { width: 140px; }

  .desktop-icons {
    flex-direction: row;
    flex-wrap: wrap;
    top: 10px;
    left: 10px;
    right: 10px;
    gap: 10px;
    justify-content: flex-start;
  }
  .desk-icon { width: 84px; }
  .icon-label { font-size: 10.5px; }

  .start-menu {
    left: 0; right: 0;
    width: 100%;
    max-width: 100%;
  }

  .win-popup { max-width: 100%; }
  .popup-overlay { padding: 0; align-items: flex-end; }
  .win-popup.open { border-radius: 10px 10px 0 0; max-height: 85vh; overflow-y: auto; }

  .taskbar-info { display: none; }
}

@media (max-width: 400px) {
  .desk-icon { width: 74px; }
}