/* =========================
   Study Reminder — Premium UI
   (UI only / no behavior changes)
   ========================= */

:root{
  --bg0:#061a2b;
  --bg1:#0a2e4a;
  --bg2:#0a4d73;

  --card: rgba(255,255,255,.14); 
  --card2: rgba(255,255,255,.18);
  --stroke: rgba(255,255,255,.16);
  --stroke2: rgba(255,255,255,.22);

  --text: rgba(255,255,255,.94);
  --muted: rgba(255,255,255,.78);

  --accent: #66d9ff;
  --accent2:#2ea7ff;

  --pink: #ffd6e7;         /* “学習記録あり”の色は残す */
  --pinkStroke: #ffb3d1;

  --danger: #ff4d6d;
  --shadow: 0 18px 60px rgba(0,0,0,.35);
  --shadow2: 0 10px 28px rgba(0,0,0,.28);

  --radius: 18px;
  --radius2: 22px;
}

*{ box-sizing:border-box; }
html,body{ height:100%; }

body{
  margin:0;

  /* ===== Font stack (SF Pro風 + 日本語可読性) ===== */
  font-family:
    -apple-system,
    BlinkMacSystemFont,
    "SF Pro Text",
    "SF Pro Display",
    "Hiragino Sans",
    "Hiragino Kaku Gothic ProN",
    "Noto Sans JP",
    "Yu Gothic",
    "Helvetica Neue",
    Arial,
    sans-serif;

  /* ===== Readability ===== */
  line-height: 1.65;
  letter-spacing: 0.02em;               /* 漢字の潰れ防止 */
  font-weight: 500;                     /* 太すぎ防止 */
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;

  /* ===== Color & Background ===== */
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 10% 0%, rgba(102,217,255,.18), transparent 60%),
    radial-gradient(900px 600px at 95% 15%, rgba(46,167,255,.16), transparent 55%),
    linear-gradient(180deg, var(--bg0), var(--bg1) 55%, var(--bg2));

  overflow-x: hidden;
}

/* 本文系は行間を維持 */
.pre,
.textarea,
.box{
  line-height: 1.65;
}

/* ===== Background layers ===== */
.bg{
  position:fixed;
  inset:0;
  z-index:-3;
  overflow:hidden;
}
.bg-video{
  position:absolute;
  inset:-2%;
  width:104%;
  height:104%;
  object-fit:cover;
  filter: blur(6px) saturate(1.08) brightness(.85);
  transform: scale(1.02);
  opacity:.60;
}
.bg-overlay{
  position:absolute;
  inset:0;
  background:
    radial-gradient(900px 420px at 15% 10%, rgba(102,217,255,.22), transparent 60%),
    radial-gradient(900px 520px at 85% 25%, rgba(46,167,255,.18), transparent 60%),
    linear-gradient(180deg, rgba(5,18,30,.78), rgba(5,18,30,.62) 55%, rgba(5,18,30,.72));
  z-index:1;
}
.bg-noise{
  position:absolute;
  inset:0;
  z-index:2;
  opacity:.07;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.75' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='220' height='220' filter='url(%23n)' opacity='.5'/%3E%3C/svg%3E");
  background-size: 220px 220px;
  pointer-events:none;
}

.app-shell{
  min-height:100%;
}

/* ===== Layout ===== */
.container{
  max-width: 880px;
  margin: 0 auto;
  padding: 14px 14px 28px;
}

/* ===== Top bar ===== */
.topbar{
  position: sticky;
  top: 0;
  z-index: 50;
  padding: 14px 14px 10px;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: rgba(7, 18, 30, .45);
  border-bottom: 1px solid rgba(255,255,255,.10);
}
.app-title{
  margin: 0 0 10px;

  /* ===== SF Pro Display 風 ===== */
  font-family:
    -apple-system,
    BlinkMacSystemFont,
    "SF Pro Display",
    "SF Pro Text",
    "Helvetica Neue",
    Arial,
    sans-serif;

  font-size: 18px;
  font-weight: 650;          /* ← 太すぎない */
  letter-spacing: 0.08em;    /* ← SF Pro感＋潰れ防止 */

  display: flex;
  align-items: center;
  gap: 10px;

  color: rgba(255,255,255,.96);
}
.app-title::before{
  content:"";
  width: 10px;
  height: 10px;
  border-radius: 999px;

  background: radial-gradient(
    circle at 30% 30%,
    #d6f6ff,
    #2ea7ff
  );

  box-shadow:
    0 0 14px rgba(102,217,255,.45),
    0 0 2px rgba(255,255,255,.6);
}

.tabs{
  display:flex;
  gap:10px;
}
.tab{
  text-decoration:none;
  color: var(--muted);
  padding: 10px 12px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,.14);
  background: rgba(255,255,255,.06);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: transform .12s ease, background .12s ease, border-color .12s ease, color .12s ease;
  font-weight: 650;
  font-size: 13px;
}
.tab:active{ transform: scale(.98); }
.tab.active{
  color: rgba(6, 22, 36, .92);
  border-color: rgba(102,217,255,.55);
  background: linear-gradient(135deg, rgba(102,217,255,.92), rgba(46,167,255,.88));
  box-shadow: 0 10px 26px rgba(46,167,255,.18);
}

/* ===== Cards ===== */
.card{
  border: 1px solid rgba(255,255,255,.18);
  border-radius: var(--radius2);
  padding: 14px;
  margin: 12px 0;

  background:
    linear-gradient(
      180deg,
      rgba(255,255,255,.18),
      rgba(255,255,255,.10)
    );

  box-shadow:
    0 20px 50px rgba(0,0,0,.35),
    inset 0 1px 0 rgba(255,255,255,.12);

  backdrop-filter: blur(14px);
}
.card h2, .card h3{
  margin: 0 0 10px;
  letter-spacing: .2px;
  text-shadow: 0 1px 2px rgba(0,0,0,.35);
}
.card h2{ font-size: 16px; font-weight: 650; letter-spacing: 0.04em; }
.card h3{ font-size: 14px; font-weight: 600; letter-spacing: 0.03em;}

.row{
  display:flex;
  align-items:center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}

.field{ margin: 10px 0; }
.label{
  font-size: 11px;
  color: var(--muted);
  display:block;
  margin-bottom: 6px;
  letter-spacing: .2px;
}

/* ===== Inputs ===== */
.input, .textarea, .select{
  width: 100%;
  padding: 12px 12px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,.16);
  background: rgba(3, 12, 20, .35);
  color: var(--text);
  outline: none;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.06);
  transition: border-color .12s ease, transform .12s ease, background .12s ease;
}
.input::placeholder, .textarea::placeholder{
  color: rgba(255,255,255,.55);
}
.input:focus, .textarea:focus, .select:focus{
  border-color: rgba(102,217,255,.55);
  background: rgba(3, 12, 20, .45);
}
.textarea{ height: 110px; resize: vertical; }
.select{ appearance:none; -webkit-appearance:none; background-image:
  linear-gradient(45deg, transparent 50%, rgba(255,255,255,.75) 50%),
  linear-gradient(135deg, rgba(255,255,255,.75) 50%, transparent 50%);
  background-position:
    calc(100% - 18px) calc(50% - 3px),
    calc(100% - 12px) calc(50% - 3px);
  background-size: 6px 6px, 6px 6px;
  background-repeat: no-repeat;
  padding-right: 34px;
}

/* ===== Buttons ===== */
button{
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,.18);
  background: rgba(255,255,255,.08);
  color: var(--text);
  cursor: pointer;
  font-weight: 700;
  letter-spacing: .2px;
  transition: transform .10s ease, border-color .12s ease, background .12s ease, box-shadow .12s ease;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
button:hover{
  border-color: rgba(102,217,255,.35);
  box-shadow: 0 10px 22px rgba(0,0,0,.22);
}
button:active{ transform: scale(.98); }

.secondary{
  background: rgba(255,255,255,.06);
  border-color: rgba(255,255,255,.14);
}

.danger{
  background: rgba(255,77,109,.10);
  border-color: rgba(255,77,109,.35);
  color: #ffd3db;
}
.danger:hover{ border-color: rgba(255,77,109,.55); }

/* ===== Text helpers ===== */
.msg{ font-size: 12px; color: rgba(255,255,255,.85); }
.muted{ color: var(--muted); }
.box{
  padding: 10px 12px;
  border: 1px solid rgba(255,255,255,.14);
  border-radius: 16px;
  background: rgba(3, 12, 20, .30);
}
.pre{ margin:0; white-space: pre-wrap; line-height: 1.5; }
.detail-title{ font-weight: 820; margin-bottom: 6px; }
.detail-meta{ font-size: 12px; margin-bottom: 8px; }

/* ===== Lists ===== */
.list{
  list-style:none;
  padding:0;
  margin:0;
  display:grid;
  gap: 10px;
}
.list-btn{
  width: 100%;
  text-align: left;
  padding: 12px 12px;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,.14);
  background: rgba(255,255,255,.07);
  font-size: 14px;
  font-weight: 650;
}
.list-btn:hover{
  border-color: rgba(102,217,255,.28);
}
.list-row{
  display:grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  align-items:center;
}

/* ===== Details / Summary (foldable panels) ===== */
.summary{
  font-size: 14px;
  color: rgba(255,255,255,.88);
  display:flex;
  align-items:center;
  justify-content: space-between;
  cursor:pointer;
  user-select:none;
  list-style:none;
  font-weight: 600;
  letter-spacing: 0.03em;
}
summary::-webkit-details-marker{ display:none; }
details.card{
  padding: 0;
}
details.card > summary{
  padding: 14px;
}
details.card[open] > summary{
  border-bottom: 1px solid rgba(255,255,255,.10);
}
details.card > *:not(summary){
  padding: 14px;
  padding-top: 10px;
}

/* ===== Calendar ===== */
.calendar{
  display:grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 10px;
}
.cal-head{
  font-size: 12px;
  color: var(--muted);
  text-align:center;
}
.cal-day{
  border: 1px solid rgba(255,255,255,.14);
  background: rgba(255,255,255,.06);
  border-radius: 16px;
  padding: 12px 0;
  text-align:center;
  cursor:pointer;
  transition: transform .10s ease, border-color .12s ease, background .12s ease;
}
.cal-day:active{ transform: scale(.98); }
.cal-day.is-out{ opacity:.35; }

/* 記録あり：ピンクで塗る（指定どおり） */
.cal-day.has-record{
  background: rgba(255,214,231,.88);
  border-color: rgba(255,179,209,.85);
  color: rgba(6, 22, 36, .92);
}
.cal-day.is-selected{
  outline: 2px solid rgba(102,217,255,.70);
  outline-offset: 2px;
}
.cal-day .n{ font-weight: 820; }

/* ===== Mobile refinements ===== */
@media (max-width: 420px){
  .container{ padding: 12px 12px 24px; }
  .tabs{ gap:8px; }
  .tab{ padding: 9px 10px; font-size: 13px; }
  .card{ padding: 12px; border-radius: 18px; }
  details.card > summary{ padding: 12px; }
  details.card > *:not(summary){ padding: 12px; }
}

/* ===== Splash Screen ===== */
#splash{
  position: fixed;
  inset: 0;
  z-index: 9999;

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

  background:
    radial-gradient(600px 300px at 50% 30%, rgba(102,217,255,.25), transparent 60%),
    linear-gradient(180deg, #061a2b, #0a2e4a);

  transition: opacity .4s ease;
}

#splash.hide{
  opacity: 0;
  pointer-events: none;
}

.splash-title{
  font-family:
    -apple-system,
    BlinkMacSystemFont,
    "SF Pro Display",
    "Helvetica Neue",
    Arial,
    sans-serif;

  font-size: 28px;
  font-weight: 700;          /* ← 800は重すぎ */
  letter-spacing: 0.14em;    /* ← Appleっぽい余白 */

  color: rgba(255,255,255,.97);

  text-shadow:
    0 8px 32px rgba(46,167,255,.40),
    0 2px 10px rgba(0,0,0,.35);

  animation: splashFade 1s ease forwards;
}

@keyframes splashFade{
  from{
    opacity: 0;
    transform: translateY(6px);
  }
  to{
    opacity: 1;
    transform: translateY(0);
  }
}