/* ========================================
   AcademicGate — Apple.com Precision Design
   Reference: apple.com/cn exact design language
   ======================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

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

:root {
  --sf-bg: #f5f5f7;
  --sf-white: #ffffff;
  --sf-black: #1d1d1f;
  --sf-gray1: #6e6e73;
  --sf-gray2: #86868b;
  --sf-gray3: #d2d2d7;
  --sf-gray4: #e8e8ed;
  --sf-blue: #0071e3;
  --sf-blue-hover: #0077ed;
  --sf-green: #34c759;
  --sf-orange: #ff9f0a;
  --sf-red: #ff3b30;
  --sf-purple: #af52de;
  --sf-nav: rgba(251, 251, 253, 0.75);
  --sf-border: rgba(0, 0, 0, 0.05);
  --sf-shadow: 0 4px 24px rgba(0, 0, 0, 0.04), 0 12px 48px rgba(0, 0, 0, 0.08);
  --sf-shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.08), 0 24px 64px rgba(0, 0, 0, 0.12);
  --apple-ease: cubic-bezier(0.25, 0.1, 0.25, 1);
  --apple-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: 'Inter', 'SF Pro Display', 'SF Pro Text', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', sans-serif;
  background: var(--sf-bg);
  color: var(--sf-black);
  line-height: 1.47059;
  font-weight: 400;
  letter-spacing: -0.022em;
}

::selection {
  background: rgba(0, 113, 227, 0.15);
}

::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--sf-gray3);
  border-radius: 4px;
}

a {
  color: var(--sf-blue);
  text-decoration: none;
  cursor: pointer;
}

a:hover {
  text-decoration: underline;
}

/* ===== NAVIGATION (apple.com exact) ===== */
.globalNav {
  position: sticky;
  top: 0;
  z-index: 9999;
  height: 44px;
  background: var(--sf-nav);
  backdrop-filter: saturate(180%) blur(30px);
  -webkit-backdrop-filter: saturate(180%) blur(30px);
  border-bottom: 0.5px solid rgba(0, 0, 0, 0.08);
}

.globalNav-inner {
  max-width: 1200px;
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 22px;
}

.globalNav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none !important;
  color: var(--sf-black);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: -0.01em;
  opacity: 0.85;
  transition: opacity 0.3s;
}

.globalNav-logo:hover {
  opacity: 1;
  text-decoration: none !important;
}

.globalNav-logo svg {
  width: 18px;
  height: 18px;
}

.globalNav-links {
  display: flex;
  gap: 0;
  list-style: none;
  align-items: center;
}

.globalNav-links a {
  display: block;
  padding: 0 12px;
  height: 44px;
  line-height: 44px;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0;
  color: var(--sf-black);
  opacity: 0.56;
  transition: opacity 0.3s;
  text-decoration: none !important;
  white-space: nowrap;
}

.globalNav-links a:hover {
  opacity: 0.72;
  text-decoration: none !important;
}

.globalNav-links a.active {
  opacity: 0.88;
}

.globalNav-user {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--sf-gray1);
}

.globalNav-user strong {
  color: var(--sf-black);
  font-weight: 600;
}

.globalNav-user a {
  font-size: 12px;
  opacity: 0.56;
  color: var(--sf-black);
}

/* ===== BUTTONS (apple.com exact) ===== */
.btn-apple {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  padding: 8px 22px;
  border-radius: 980px;
  border: none;
  font-family: inherit;
  font-size: 17px;
  line-height: 1.17648;
  font-weight: 400;
  letter-spacing: -0.022em;
  cursor: pointer;
  transition: all 0.3s var(--apple-ease);
  text-decoration: none !important;
  white-space: nowrap;
}

.btn-apple:hover {
  text-decoration: none !important;
}

.btn-apple-blue {
  background: var(--sf-blue);
  color: #fff;
}

.btn-apple-blue:hover {
  background: var(--sf-blue-hover);
  transform: scale(1.02);
}

.btn-apple-outline {
  background: transparent;
  color: var(--sf-blue);
  border: 1px solid var(--sf-blue);
}

.btn-apple-outline:hover {
  background: var(--sf-blue);
  color: #fff;
}

.btn-apple-dark {
  background: var(--sf-black);
  color: #fff;
}

.btn-apple-dark:hover {
  background: #333;
}

.btn-apple-gray {
  background: var(--sf-gray4);
  color: var(--sf-black);
}

.btn-apple-gray:hover {
  background: var(--sf-gray3);
}

.btn-apple-sm {
  padding: 4px 16px;
  font-size: 14px;
}

.btn-apple-red {
  background: rgba(255, 59, 48, 0.08);
  color: var(--sf-red);
}

.btn-apple-red:hover {
  background: rgba(255, 59, 48, 0.14);
}

/* ===== TEXT LINK ===== */
.link-more {
  font-size: 21px;
  color: var(--sf-blue);
  transition: color 0.3s;
}

.link-more:hover {
  text-decoration: underline;
}

.link-more::after {
  content: ' ›';
}

/* ===== AD CARDS GRID ===== */
.promo-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 56px 22px 80px;
}

.promo-section .section-title {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: 0.004em;
  color: var(--sf-black);
  margin-bottom: 28px;
}

.promo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 20px;
}

/* Card tile */
/* Tile base */
.tile {
  background: var(--sf-white);
  border-radius: 20px;
  padding: 24px;
  position: relative;
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  cursor: pointer;
  border: 1px solid rgba(0, 0, 0, 0.06);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.03);
  gap: 16px;
}

.tile:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.08);
  border-color: rgba(0, 0, 0, 0.1);
}

.tile.pinned {
  border: 1.5px solid rgba(175, 82, 222, 0.3);
  background: linear-gradient(to bottom, #fcfaff, #ffffff);
}

.tile-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  width: 100%;
}

.tile-icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.tile-badges {
  display: flex;
  gap: 6px;
  align-items: center;
}

.tile-pin-badge {
  font-size: 11px;
  padding: 3px 8px;
}

.tile-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.tile-name {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--sf-black);
  margin: 0;
  line-height: 1.3;
}

.tile-desc {
  font-size: 14px;
  color: var(--sf-gray1);
  line-height: 1.5;
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.tile-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 16px;
  border-top: 1px solid var(--sf-border);
  margin-top: auto;
}

.tile-contact {
  font-size: 13px;
  color: var(--sf-gray2);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.contact-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

.contact-val {
  font-weight: 500;
  color: var(--sf-black);
}

.btn-action {
  transition: transform 0.2s, opacity 0.2s;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.btn-action:hover {
  transform: scale(1.03);
  opacity: 0.9;
}

/* ===== AUTH ===== */
.auth-shell {
  min-height: calc(100vh - 44px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 22px;
  background: var(--sf-bg);
}

.auth-box {
  background: var(--sf-white);
  border-radius: 18px;
  padding: 44px 40px;
  width: 100%;
  max-width: 380px;
  box-shadow: var(--sf-shadow);
}

.auth-box h2 {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.016em;
  text-align: center;
  margin-bottom: 4px;
}

.auth-box .sub {
  text-align: center;
  font-size: 14px;
  color: var(--sf-gray2);
  margin-bottom: 32px;
}

/* ===== FORMS (apple.com style) ===== */
.fg {
  margin-bottom: 16px;
}

.fg label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--sf-gray1);
  margin-bottom: 6px;
  letter-spacing: 0.02em;
}

.fi {
  width: 100%;
  padding: 10px 14px;
  background: var(--sf-bg);
  border: 1.5px solid var(--sf-gray3);
  border-radius: 10px;
  color: var(--sf-black);
  font-family: inherit;
  font-size: 17px;
  font-weight: 400;
  letter-spacing: -0.022em;
  transition: border-color 0.2s, box-shadow 0.2s;
  outline: none;
}

.fi:focus {
  border-color: var(--sf-blue);
  box-shadow: 0 0 0 4px rgba(0, 113, 227, 0.1);
}

.fi::placeholder {
  color: var(--sf-gray3);
}

textarea.fi {
  min-height: 80px;
  resize: vertical;
  line-height: 1.47;
}

select.fi {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath fill='%2386868b' d='M5 6L0 0h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
}

.fi-mono {
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  letter-spacing: 1px;
  font-size: 15px;
}

/* ===== PANEL ===== */
.panel {
  background: var(--sf-white);
  border-radius: 18px;
  padding: 28px;
  margin-bottom: 16px;
  box-shadow: 0 0 0 0.5px var(--sf-border);
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 0.5px solid var(--sf-border);
}

.panel-head h3 {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

/* ===== TABS (apple segmented) ===== */
.seg {
  display: inline-flex;
  background: var(--sf-gray4);
  padding: 2px;
  border-radius: 9px;
  margin-bottom: 24px;
}

.seg button {
  padding: 6px 16px;
  border: none;
  background: transparent;
  border-radius: 7px;
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  color: var(--sf-gray1);
  cursor: pointer;
  transition: all 0.18s;
  white-space: nowrap;
}

.seg button.on {
  background: var(--sf-white);
  color: var(--sf-black);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

.seg button:hover:not(.on) {
  color: var(--sf-black);
}

/* ===== TABLE ===== */
.tw {
  overflow-x: auto;
  border-radius: 12px;
  border: 0.5px solid var(--sf-border);
}

table {
  width: 100%;
  border-collapse: collapse;
}

th {
  text-align: left;
  padding: 8px 14px;
  font-size: 11px;
  font-weight: 600;
  color: var(--sf-gray2);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: var(--sf-bg);
  border-bottom: 0.5px solid var(--sf-border);
}

td {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--sf-gray1);
  border-bottom: 0.5px solid var(--sf-border);
}

tr:last-child td {
  border-bottom: none;
}

tr:hover td {
  background: rgba(0, 0, 0, 0.015);
}

/* ===== BADGE ===== */
.bg {
  display: inline-flex;
  padding: 2px 8px;
  border-radius: 980px;
  font-size: 11px;
  font-weight: 600;
}

.bg-g {
  background: rgba(52, 199, 89, 0.1);
  color: var(--sf-green);
}

.bg-r {
  background: rgba(255, 59, 48, 0.1);
  color: var(--sf-red);
}

.bg-o {
  background: rgba(255, 159, 10, 0.1);
  color: var(--sf-orange);
}

.bg-b {
  background: rgba(0, 113, 227, 0.08);
  color: var(--sf-blue);
}

.bg-p {
  background: rgba(175, 82, 222, 0.1);
  color: var(--sf-purple);
}

/* ===== TOAST ===== */
.toast-area {
  position: fixed;
  top: 56px;
  right: 22px;
  z-index: 99999;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}

.toast-item {
  padding: 12px 18px;
  border-radius: 12px;
  font-size: 14px;
  font-weight: 500;
  background: var(--sf-white);
  box-shadow: var(--sf-shadow-lg);
  animation: toastIn 0.4s var(--apple-ease);
  pointer-events: auto;
  border-left: 3px solid var(--sf-blue);
}

.toast-item.ok {
  border-left-color: var(--sf-green);
}

.toast-item.err {
  border-left-color: var(--sf-red);
}

/* ===== STEPS (wizard) ===== */
.wizard {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 32px;
}

.wiz-step {
  display: flex;
  align-items: center;
  gap: 8px;
}

.wiz-num {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--sf-gray4);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  color: var(--sf-gray2);
  transition: all 0.4s var(--apple-ease);
}

.wiz-step.on .wiz-num {
  background: var(--sf-blue);
  color: #fff;
}

.wiz-step.ok .wiz-num {
  background: var(--sf-green);
  color: #fff;
}

.wiz-text {
  font-size: 13px;
  color: var(--sf-gray2);
  font-weight: 500;
}

.wiz-step.on .wiz-text {
  color: var(--sf-black);
}

.wiz-line {
  width: 40px;
  height: 1.5px;
  background: var(--sf-gray3);
}

.wiz-line.ok {
  background: var(--sf-green);
}

/* ===== EMPTY ===== */
.empty {
  text-align: center;
  padding: 64px 20px;
}

.empty .ei {
  font-size: 40px;
  margin-bottom: 12px;
  opacity: 0.3;
}

.empty h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--sf-gray1);
  margin-bottom: 4px;
}

.empty p {
  font-size: 14px;
  color: var(--sf-gray2);
}

/* ===== MODAL ===== */
.modal-bg {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.48);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 10000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 22px;
}

.modal-bg.show {
  display: flex;
  animation: fadeIn 0.2s;
}

.modal-box {
  background: var(--sf-white);
  border-radius: 18px;
  padding: 32px;
  width: 100%;
  max-width: 460px;
  max-height: 85vh;
  overflow-y: auto;
  animation: scaleUp 0.25s var(--apple-spring);
  box-shadow: var(--sf-shadow-lg);
}

.modal-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.modal-top h3 {
  font-size: 17px;
  font-weight: 700;
}

.modal-x {
  width: 26px;
  height: 26px;
  border: none;
  background: var(--sf-gray4);
  border-radius: 50%;
  color: var(--sf-gray2);
  font-size: 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
}

.modal-x:hover {
  background: var(--sf-gray3);
  color: var(--sf-black);
}

/* ===== FOOTER ===== */
.globalFooter {
  text-align: center;
  padding: 20px 22px;
  border-top: 0.5px solid var(--sf-border);
  font-size: 12px;
  color: var(--sf-gray2);
  background: var(--sf-bg);
}

/* ===== CODE ===== */
.code {
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.3px;
  color: var(--sf-black);
  background: var(--sf-bg);
  padding: 3px 8px;
  border-radius: 6px;
  cursor: pointer;
  user-select: all;
  word-break: break-all;
  transition: background 0.15s;
}

.code:hover {
  background: var(--sf-gray4);
}

/* ===== ACTIONS ===== */
.acts {
  display: flex;
  gap: 4px;
}

.act {
  width: 30px;
  height: 30px;
  border: none;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.15s;
  background: var(--sf-bg);
  color: var(--sf-gray1);
}

.act:hover {
  background: var(--sf-gray4);
  color: var(--sf-black);
}

.act-r {
  color: var(--sf-red);
}

.act-r:hover {
  background: rgba(255, 59, 48, 0.08);
}

/* ===== GEN ROW ===== */
.gen-row {
  display: flex;
  gap: 12px;
  align-items: flex-end;
  flex-wrap: wrap;
}

.gen-row .fg {
  margin-bottom: 0;
}

.gen-out {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 14px;
}

/* ===== SPINNER ===== */
.spin {
  width: 18px;
  height: 18px;
  border: 2px solid var(--sf-gray3);
  border-top-color: var(--sf-blue);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  margin: 0 auto;
}

.spin-w {
  border-color: rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes scaleUp {
  from {
    opacity: 0;
    transform: scale(0.95);
  }

  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes toastIn {
  from {
    opacity: 0;
    transform: translateY(-8px) scale(0.98);
  }

  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes floatUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: none;
  }
}

.reveal {
  opacity: 0;
  transform: translateY(30px);
  animation: floatUp 0.7s var(--apple-ease) forwards;
}

.reveal:nth-child(1) {
  animation-delay: 0s;
}

.reveal:nth-child(2) {
  animation-delay: 0.08s;
}

.reveal:nth-child(3) {
  animation-delay: 0.16s;
}

.reveal:nth-child(4) {
  animation-delay: 0.24s;
}

.reveal:nth-child(5) {
  animation-delay: 0.32s;
}

.reveal:nth-child(6) {
  animation-delay: 0.4s;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 734px) {
  .hero-section h1 {
    font-size: 36px;
  }

  .hero-section .hero-sub {
    font-size: 19px;
  }

  .hero-stats {
    gap: 28px;
  }

  .hero-stats .sv {
    font-size: 28px;
  }

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

  .globalNav-links a {
    padding: 0 8px;
    font-size: 11px;
  }

  .auth-box {
    padding: 32px 24px;
  }

  .panel {
    padding: 20px;
  }

  .gen-row {
    flex-direction: column;
    align-items: stretch;
  }
}