/* =========================================================
   Base Reset
========================================================= */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: sans-serif;
}

html {
  background: var(--color-surface);
}

/* =========================================================
   Theme Tokens (Light) – tweak here if you change brand colors
========================================================= */
:root {
  --color-primary: #6200ea;
  /* light mode primary */
  --color-primary-contrast: #ffffff;
  --color-surface: #ffffff;
  --color-text-muted: #888;
  --color-text-dim: #aaa;
  --shadow-elev-1: 0 -2px 10px rgba(0, 0, 0, 0.1);
  --shadow-fab: 0 4px 10px rgba(0, 0, 0, 0.2);
  /* Ripple (light) */
  --ripple-color: rgba(186, 104, 200, 0.35);
  /* soft purple */
}

/* =========================================================
   Layout
========================================================= */
.content {
  margin-bottom: 100px;
  min-height: calc(100vh - 80px); /* fill screen above bottom nav */
  padding: 20px;
  background: inherit;
}

/* --- iOS shell layout adjustments --- */
html,
body {
  height: 100%;
  overflow: hidden;
}
body {
  overscroll-behavior: none;
}
.content {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: calc(var(--nav-h, 80px) + env(safe-area-inset-bottom));
  overflow-y: auto;
  -webkit-overflow-scrolling: touch; /* smooth iOS momentum */
  contain: content;
}
/* Fixed nav stays pinned and respects safe area */
.nav-container {
  padding-bottom: env(safe-area-inset-bottom);
}
/* Ensure modal still covers viewport without enabling body scroll */
.modal {
  position: fixed !important;
  inset: 0 !important;
  overflow: auto;
  -webkit-overflow-scrolling: touch;
}

/* =========================================================
   Bottom Navigation
========================================================= */
.nav-container {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 80px;
  background: var(--color-surface);
  box-shadow: var(--shadow-elev-1);
  display: flex;
  justify-content: space-around;
  align-items: center;
  border-top-left-radius: 0;
  border-top-right-radius: 0;
  z-index: 10;
}

/* on-load slide up */
.nav-container {
  will-change: transform, opacity;
  animation: navSlideUp 480ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

@keyframes navSlideUp {
  0% {
    transform: translateY(100%);
    opacity: 0;
  }
  60% {
    transform: translateY(-4px);
    opacity: 1;
  }
  80% {
    transform: translateY(0);
  }
  100% {
    transform: translateY(0);
  }
}

.nav-item {
  flex: 1;
  text-align: center;
  position: relative;
  z-index: 1;
}

/* buttons */
.nav-item > button.icon {
  background: none;
  border: none;
  padding: 8px;
  font-size: 24px;
  cursor: pointer;
  color: var(--color-text-dim);
  transition: color 0.3s;
}

.nav-item > button.icon:focus {
  outline: 2px solid #5b9dd9;
  outline-offset: 2px;
}

/* active state */
.nav-item.active button {
  color: var(--color-primary);
}

/* labels */
.nav-label {
  font-family: "PingFang SC", "Segoe UI", Arial, sans-serif;
  font-size: 13.5px;
  color: var(--color-text-muted);
  margin-top: 2px;
  text-align: center;
  line-height: 1.2;
  user-select: none;
  font-weight: 500;
  letter-spacing: 0.5px;
  transition: color 0.3s, font-weight 0.3s;
}

.nav-item.active .nav-label {
  color: var(--color-primary);
  font-weight: 600;
}

/* selection indicator */
.indicator {
  position: absolute;
  bottom: 0;
  height: 4px;
  width: 25%;
  left: 0;
  background: var(--color-primary);
  border-radius: 4px 4px 0 0;
  transition: transform 0.3s;
}

/* center (FAB-like) button */
.center-button-wrapper {
  position: absolute;
  top: -35px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2000;
}

.center-button {
  width: 70px;
  height: 70px;
  background: var(--color-primary);
  color: var(--color-primary-contrast);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 30px;
  cursor: pointer;
  transition: transform 0.4s ease, background-color 0.3s ease;
  box-shadow: var(--shadow-fab);
  position: relative;
  clip-path: path('M35,62.27l-4.23-3.85C15.75,44.8,5.83,35.82,5.83,24.79 C5.83,15.81,12.89,8.75,21.87,8.75c5.08,0,9.95,2.36,13.13,6.1C38.18,11.11,43.05,8.75,48.13,8.75 C57.11,8.75,64.17,15.81,64.17,24.79c0,11.03-9.92,20.01-24.94,33.63L35,62.27z');
}

.center-button .material-symbols-rounded {
  font-size: 32px;
  transform: translateY(-2px);
}

/* 涟漪效果 */
.center-button.ripple::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  border-radius: 50%;
  pointer-events: none;
  box-shadow: 0 0 0 0 var(--ripple-color);
  opacity: 0;
  animation: fabRing 900ms ease-out 120ms both;
}

@keyframes fabRing {
  0% {
    opacity: 1;
    box-shadow: 0 0 0 0 var(--ripple-color);
  }
  60% {
    opacity: 0.7;
  }
  100% {
    opacity: 0;
    box-shadow: 0 0 0 22px rgba(0, 0, 0, 0);
  }
}

.center-button.pulse {
  animation: heartPulse 0.6s ease-in-out;
}

@keyframes heartPulse {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.15);
  }
  100% {
    transform: scale(1);
  }
}

/* icons */
.icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.icon:hover {
  transform: scale(1.2);
  opacity: 0.8;
}

.icon .material-symbols-rounded {
  font-variation-settings: "FILL" 0, "wght" 400, "GRAD" 0, "opsz" 24;
  font-size: 24px;
  line-height: 1;
}

.center-button .material-symbols-rounded {
  font-size: 28px;
}

/* =========================================================
   Modal
========================================================= */
.modal {
  position: fixed;
  z-index: 999;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.35);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  transition: background 0.3s;
  pointer-events: auto;
}

@keyframes popSlideUp {
  0% {
    transform: translateY(24px) scale(0.985);
    opacity: 0;
  }
  60% {
    transform: translateY(-2px) scale(1.008);
    opacity: 1;
  }
  80% {
    transform: translateY(0) scale(0.997);
    opacity: 1;
  }
  100% {
    transform: translateY(0) scale(1);
    opacity: 1;
  }
}

.modal-content {
  position: absolute;
  left: 12px;
  right: 12px;
  top: 100px;
  bottom: 120px;
  margin: 0 auto;
  background: #fff;
  border-radius: 18px;
  padding: 32px 16px 24px 16px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.18);
  will-change: transform, opacity;
  backface-visibility: hidden;
  animation: popSlideUp 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
  font-family: "Segoe UI", "PingFang SC", Arial, sans-serif;
  overflow-y: auto;
  z-index: 1001;
  pointer-events: auto;
  width: auto;
  min-width: unset;
  max-width: 500px;
}

@media (max-width: 480px) {
  .modal-content {
    left: 4px;
    right: 4px;
    padding: 16px 4px;
    max-width: 90vw;
  }
}

@keyframes popSlideDown {
  0% {
    transform: translateY(0) scale(1);
    opacity: 1;
  }
  20% {
    transform: translateY(-1px) scale(0.998);
    opacity: 0.96;
  }
  100% {
    transform: translateY(24px) scale(0.985);
    opacity: 0;
  }
}

.modal-content.closing {
  animation: popSlideDown 0.35s cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
}

/* =========================================================
   Dark Mode
========================================================= */
@media (prefers-color-scheme: dark) {
  :root {
    --color-primary: #bb86fc;
    /* dark mode primary */
    --color-primary-contrast: #18181c;
    --color-surface: #23232a;
    --color-text-muted: #888;
    --color-text-dim: #888;
    /* Ripple (dark) */
    --ripple-color: rgba(203, 148, 217, 0.5);
    /* brighter purple for contrast */
  }

  html,
  body,
  .content,
  #content {
    background: #18181c !important;
    color: #e5e5e5;
  }

  .nav-container {
    background: var(
      --color-surface
    ) !important; /* restore intended dark mode surface color */
    box-shadow: none; /* remove darker band above the bar */
    border-top-left-radius: 0;
    border-top-right-radius: 0;
  }

  .nav-item > button.icon {
    color: var(--color-text-muted);
  }

  .nav-item.active button {
    color: var(--color-primary);
  }

  .indicator {
    background: var(--color-primary);
  }

  .center-button {
    background: var(--color-primary);
    color: var(--color-primary-contrast);
  }

  .modal {
    background: rgba(24, 24, 28, 0.5);
  }

  .modal-content {
    background: var(--color-surface);
    color: #e5e5e5;
  }

  .nav-label {
    color: var(--color-text-muted);
    font-family: "PingFang SC", "Segoe UI", Arial, sans-serif;
  }

  .nav-item.active .nav-label {
    color: var(--color-primary);
    font-weight: 600;
  }
}
@media (prefers-reduced-motion: reduce) {
  .modal-content {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
  .modal-content.closing {
    animation-duration: 0.01ms !important;
  }
  .nav-container {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
  .center-button::after {
    animation: none !important;
  }
}

@media (max-width: 380px) {
  .modal-content {
    animation-duration: 0.42s;
  }
}