@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@500;600;700;800&family=Inter:wght@400;500;600&display=swap');

/* =========================================================
   DESIGN SYSTEM
========================================================= */
:root {
  --bg-main: #F8FAFC;
  --bg-surface: #FFFFFF;
  --bg-hero: #0F172A;
  --bg-hero-alt: #1E293B;
  --primary-gold: #F59E0B;
  --primary-hover: #D97706;
  --text-main: #0F172A;
  --text-muted: #64748B;
  --text-light: #F8FAFC;
  --line-color: #E2E8F0;
  --font-heading: 'Plus Jakarta Sans', sans-serif;
  --font-body: 'Inter', sans-serif;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(15,23,42,0.08);
  --shadow-lg: 0 12px 28px rgba(15,23,42,0.12);
  --transition: all 0.2s cubic-bezier(0.16,1,0.3,1);
}

/* =========================================================
   GLOBAL RESET
========================================================= */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  text-decoration: none;
  color: inherit;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-heading);
  letter-spacing: -0.02em;
}

/* =========================================================
   COMMON CONTAINER
======================================================== */
.container {
  width: 100%;
  max-width: 1160px;
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* =========================================================
   TOPBAR
========================================================= */
.topbar {
  background: var(--bg-hero);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  padding: 14px 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(10px);
}

.topbar .logo {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 22px;
  color: var(--text-light);
}

.topbar .logo span {
  color: var(--primary-gold);
}

.nav-group {
  display: flex;
  align-items: center;
}

.topbar nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.topbar nav a {
  color: #94A3B8;
  font-size: 14px;
  font-weight: 600;
  transition: var(--transition);
}

.topbar nav a:hover {
  color: var(--text-light);
}

.account-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.15);
  color: var(--text-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-left: 24px;
  transition: var(--transition);
}

.account-btn:hover {
  background: var(--primary-gold);
  border-color: var(--primary-gold);
  color: var(--bg-hero);
  transform: translateY(-2px);
}

/* =========================================================
   MAIN PAGE
========================================================= */
.page-container {
  width: 100%;
  max-width: 1160px;
  margin: 0 auto;
  padding: 48px 24px 80px;
  flex: 1;
}

/* =========================================================
   PAGE HEADING
========================================================= */
.page-heading {
  margin-bottom: 28px;
}

.page-heading h1 {
  font-size: 32px;
  font-weight: 800;
  margin-bottom: 5px;
}

.page-heading p {
  color: var(--text-muted);
  font-size: 14px;
}

/* =========================================================
   EXAM SELECTOR
========================================================= */
.exam-selector {
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  background: #E2E8F0;
  padding: 6px;
  border-radius: 14px;
  margin-bottom: 42px;
}

.exam-tab {
  border: none;
  background: transparent;
  padding: 17px 20px;
  border-radius: 10px;
  cursor: pointer;
  text-align: center;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.exam-tab:hover {
  background: rgba(255,255,255,0.6);
}

.exam-tab.active {
  background: var(--bg-surface);
  box-shadow: var(--shadow-sm);
}

.exam-name {
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 800;
  color: var(--text-main);
}

.exam-description {
  font-size: 12px;
  color: var(--text-muted);
}

.exam-tab.active .exam-name {
  color: var(--primary-hover);
}

/* =========================================================
   SECTION
========================================================= */
.section-block {
  margin-bottom: 42px;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 18px;
}

.section-header h2 {
  font-size: 21px;
  font-weight: 800;
  margin-bottom: 3px;
}

.section-header p {
  color: var(--text-muted);
  font-size: 13px;
}

/* =========================================================
   TEST TYPE GRID
========================================================= */
.test-type-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.test-type-card {
  background: var(--bg-surface);
  border: 1px solid var(--line-color);
  border-radius: var(--radius-lg);
  padding: 22px;
  display: flex;
  align-items: center;
  gap: 16px;
  position: relative;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.test-type-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: #CBD5E1;
}

.test-type-card.selected {
  border-color: var(--primary-gold);
}

.test-type-icon {
  min-width: 42px;
  height: 42px;
  border-radius: 10px;
  background: #FEF3C7;
  display: flex;
  align-items: center;
  justify-content: center;
}

.test-type-icon span {
  font-family: var(--font-heading);
  font-size: 11px;
  font-weight: 800;
  color: var(--primary-hover);
}

.test-type-content {
  flex: 1;
}

.test-type-content h3 {
  font-size: 15px;
  font-weight: 800;
  margin-bottom: 3px;
}

.test-type-content p {
  font-size: 12.5px;
  color: var(--text-muted);
  line-height: 1.5;
}

.selected-label {
  position: absolute;
  top: 12px;
  right: 14px;
  font-size: 10px;
  font-weight: 700;
  color: var(--primary-hover);
  background: #FEF3C7;
  padding: 3px 7px;
  border-radius: 20px;
}

.small-btn {
  background: var(--bg-hero);
  color: var(--text-light);
  font-family: var(--font-heading);
  font-size: 11px;
  font-weight: 700;
  padding: 8px 13px;
  border-radius: 6px;
  transition: var(--transition);
  white-space: nowrap;
}

.small-btn:hover {
  background: var(--primary-gold);
  color: var(--bg-hero);
}

/* =========================================================
   PAPER SECTION
========================================================= */
.papers-section {
  margin-top: 8px;
}

.paper-header {
  align-items: center;
}

.paper-count {
  background: var(--bg-hero);
  color: var(--text-light);
  font-family: var(--font-heading);
  font-size: 11px;
  font-weight: 700;
  padding: 6px 12px;
  border-radius: 20px;
}

/* =========================================================
   PAPER PANELS
========================================================= */
.paper-panel {
  display: none;
}

.paper-panel.active {
  display: block;
}

/* =========================================================
   SHIFT ROW
========================================================= */
.shift-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-bottom: 18px;
}

/* =========================================================
   PAPER CARD
========================================================= */
.shift-row .paper-card,
.paper-panel > .paper-card {
  background: var(--bg-surface);
  border: 1px solid var(--line-color);
  border-radius: var(--radius-md);
  min-height: 86px;
  padding: 16px 18px;
  display: flex;
  align-items: center;
  gap: 20px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.shift-row .paper-card:hover,
.paper-panel > .paper-card:hover {
  border-color: #CBD5E1;
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

/* =========================================================
   PAPER DATE
========================================================= */
.shift-row .paper-date {
  min-width: 105px;
  padding-right: 20px;
  border-right: 1px solid var(--line-color);
  display: flex;
  flex-direction: column;
}

.paper-year {
  font-family: var(--font-heading);
  font-size: 11px;
  font-weight: 700;
  color: var(--primary-hover);
}

.paper-date strong {
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 800;
}

/* =========================================================
   PAPER INFORMATION
========================================================= */
.shift-row .paper-info {
  flex: 1;
}

.paper-info h3 {
  font-size: 14px;
  font-weight: 800;
  margin-bottom: 2px;
}

.paper-info p {
  font-size: 12.5px;
  color: var(--text-muted);
}

/* =========================================================
   PAPER META
========================================================= */
.shift-row .paper-meta {
  display: flex;
  gap: 8px;
}

.paper-meta span {
  background: #F1F5F9;
  color: var(--text-muted);
  font-size: 10.5px;
  font-weight: 600;
  padding: 5px 8px;
  border-radius: 5px;
}

/* =========================================================
   PAPER BUTTON
========================================================= */
.shift-row .paper-btn {
  background: var(--primary-gold);
  color: var(--bg-hero);
  font-family: var(--font-heading);
  font-size: 12px;
  font-weight: 800;
  padding: 9px 18px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  white-space: nowrap;
}

.shift-row .paper-btn:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

/* =========================================================
   LOCKED STATES & FADING
========================================================= */
.paper-card.locked-paper {
  opacity: 0.45;
  filter: grayscale(0.7);
  background: #F8FAFC !important;
  border: 1px dashed #CBD5E1 !important;
}

.paper-btn.locked-btn {
  background: #64748B !important;
  color: #FFFFFF !important;
  cursor: not-allowed;
}

.paper-btn.locked-btn:hover {
  background: #64748B !important;
  transform: none;
}

.test-type-card.locked-card {
  opacity: 0.5;
  filter: grayscale(0.7);
}

.test-type-card.locked-card .small-btn {
  background: #64748B !important;
  cursor: not-allowed;
}

.test-type-card.locked-card .small-btn:hover {
  background: #64748B !important;
  color: var(--text-light) !important;
}

/* =========================================================
   FOOTER
========================================================= */
.site-footer {
  background: var(--bg-hero);
  color: #94A3B8;
  padding-top: 50px;
  margin-top: auto;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 36px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-brand .logo {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 800;
  color: var(--text-light);
  margin-bottom: 6px;
}

.footer-brand .logo span {
  color: var(--primary-gold);
}

.footer-brand p {
  font-size: 13.5px;
  max-width: 340px;
}

.footer-contact {
  width: auto;
  background: transparent;
  border: 1px solid transparent;
  color: #94A3B8;
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 14px;
  transition: var(--transition);
}

.footer-contact:hover {
  background: var(--primary-gold);
  color: var(--bg-hero);
  border-color: var(--primary-gold);
  transform: translateY(-1px);
}

.footer-bottom {
  background: #090E1A;
  padding: 20px 0;
}

.footer-bottom-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  margin-bottom: 10px;
}

.footer-legal a {
  margin-left: 20px;
  transition: var(--transition);
}

.footer-legal a:hover {
  color: var(--text-light);
}

.footer-disclaimer {
  font-size: 11.5px;
  color: #64748B;
  text-align: center;
  line-height: 1.5;
  padding-bottom: 0;
}

/* =========================================================
   RESPONSIVE
========================================================= */
@media (max-width: 850px) {
  .test-type-grid {
    grid-template-columns: 1fr;
  }

  .shift-row {
    grid-template-columns: 1fr;
  }

  .paper-meta {
    display: none;
  }
}

@media (max-width: 650px) {
  .topbar {
    padding: 14px 20px;
  }

  .topbar nav {
    gap: 14px;
  }

  .topbar nav a {
    font-size: 12px;
  }

  .account-btn {
    margin-left: 12px;
  }

  .page-container {
    padding-top: 32px;
  }

  .page-heading h1 {
    font-size: 27px;
  }

  .exam-selector {
    grid-template-columns: 1fr;
  }

  .exam-tab {
    padding: 14px;
  }

  .test-type-card {
    padding: 17px;
  }

  .shift-row {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .shift-row .paper-card {
    gap: 12px;
    padding: 14px;
  }

  .shift-row .paper-date {
    min-width: 75px;
    padding-right: 12px;
  }

  .shift-row .paper-date strong {
    font-size: 13px;
  }

  .shift-row .paper-info h3 {
    font-size: 13px;
  }

  .shift-row .paper-info p {
    font-size: 11px;
  }

  .shift-row .paper-btn {
    padding: 8px 12px;
    font-size: 11px;
  }

  .footer-inner,
  .footer-bottom-inner {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }

  .footer-legal a {
    margin: 0 8px;
  }
}

@media (max-width: 450px) {
  .topbar nav a:nth-child(3) {
    display: none;
  }

  .shift-row .paper-date {
    display: none;
  }

  .shift-row .paper-card {
    align-items: flex-start;
  }
}