/* ============================================================
   トライボイス アカデミア — Design System
   Light paper base / deep navy / antique gold
   ============================================================ */

/* ---- Fonts ---- */
@import url('https://fonts.googleapis.com/css2?family=Zen+Kaku+Gothic+New:wght@400;500;700;900&family=Noto+Sans+JP:wght@400;500;700;900&family=Archivo:ital,wght@0,400;0,500;0,600;0,700;0,800;1,500&display=swap');

/* ---- Tokens ---- */
:root{
  --ink:#181A22;          /* near-black, navy-tinted text */
  --ink-soft:#41444F;
  --muted:#71747F;
  --navy:#172033;         /* dark sections (Tri-Dia / footer only) */
  --navy-2:#0F1726;       /* deepest */
  --navy-line:rgba(255,255,255,.12);
  --paper:#FBFBFD;        /* bright cool white base */
  --paper-2:#FFFFFF;
  --paper-3:#F1F2F8;      /* light cool alt section */
  --line:rgba(24,26,34,.09);
  --line-2:rgba(24,26,34,.15);
  --gold:#C2A24E;
  --gold-deep:#A6873A;
  --gold-soft:#E7DBBE;
  --gold-tint:#F1ECDC;

  /* vivid brand gradient — bright extension of navy → gold accent */
  --grad:linear-gradient(100deg,#2F6BF6 0%,#6B45D9 52%,#A23BBE 100%);
  --grad-rev:linear-gradient(280deg,#2F6BF6 0%,#6B45D9 52%,#A23BBE 100%);
  --grad-soft:linear-gradient(120deg, rgba(47,107,246,.12), rgba(162,59,190,.10));
  --iris:#5A52E0;         /* solid mid-tone of the gradient for borders/fills */

  --wrap:1200px;
  --pad:clamp(20px,5vw,64px);
  --r:14px;
  --r-lg:22px;
  --shadow-sm:0 1px 2px rgba(24,26,34,.05), 0 8px 22px rgba(40,46,90,.06);
  --shadow:0 28px 64px -30px rgba(40,46,90,.30);

  --f-head:"Zen Kaku Gothic New", system-ui, sans-serif;
  --f-body:"Noto Sans JP", system-ui, sans-serif;
  --f-en:"Archivo", system-ui, sans-serif;
}

/* ---- Reset ---- */
.sr-only{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;}
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;background:var(--paper);overflow-x:hidden;}
body{
  margin:0;
  overflow-x:hidden;
  max-width:100%;
  font-family:var(--f-body);
  color:var(--ink);
  background:transparent;
  font-weight:400;
  line-height:1.85;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
button{font-family:inherit;cursor:pointer;}
h1,h2,h3,h4{font-family:var(--f-head);line-height:1.32;margin:0;font-weight:700;letter-spacing:.01em;}
p{margin:0;text-wrap:pretty;}

/* ---- Layout ---- */
.wrap{max-width:var(--wrap);margin-inline:auto;padding-inline:var(--pad);}
.wrap-tight{max-width:980px;margin-inline:auto;padding-inline:var(--pad);}
section{position:relative;}
.section{padding-block:clamp(72px,9vw,140px);}
.section-sm{padding-block:clamp(56px,6vw,96px);}

/* ---- Eyebrow / section labels ---- */
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--f-en);font-weight:600;font-size:13px;
  letter-spacing:.22em;text-transform:uppercase;color:var(--gold-deep);
}
.eyebrow::before{
  content:"";width:26px;height:1.5px;background:var(--gold);display:inline-block;
}
.eyebrow.center{justify-content:center;}
.eyebrow.on-dark{color:var(--gold);}
.kanji-label{font-family:var(--f-head);font-weight:500;letter-spacing:.18em;}

.section-head{max-width:760px;}
.section-head .h2{
  font-size:clamp(28px,3.6vw,46px);font-weight:900;line-height:1.34;
  margin-top:18px;letter-spacing:-.015em;
}
.section-head .lead{margin-top:22px;color:var(--ink-soft);font-size:clamp(15px,1.15vw,17px);}
.center .section-head,.section-head.center{margin-inline:auto;text-align:center;}

/* ---- Buttons ---- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  font-family:var(--f-head);font-weight:700;font-size:15px;letter-spacing:.04em;
  padding:16px 28px;border-radius:999px;border:1.5px solid transparent;
  transition:transform .18s ease, background .2s ease, color .2s ease, box-shadow .2s ease;
  white-space:nowrap;
}
.btn .arr{font-family:var(--f-en);font-weight:700;}
.btn-primary{background:var(--grad);color:#fff;background-size:140% 140%;}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 18px 34px -16px rgba(74,60,200,.55);background-position:100% 0;}
.btn-gold{background:var(--grad);color:#fff;background-size:140% 140%;}
.btn-gold:hover{transform:translateY(-2px);background-position:100% 0;box-shadow:0 16px 34px -14px rgba(74,60,200,.55);}
.btn-bluepurple{background:linear-gradient(100deg,#2955CB 0%,#8435DD 45%,#C01BEC 72%,#ED12F2 100%);color:#fff;background-size:150% 150%;}
.btn-bluepurple:hover{transform:translateY(-2px);background-position:100% 0;box-shadow:0 16px 34px -14px rgba(192,27,236,.6);}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line-2);}
.btn-ghost:hover{border-color:var(--ink);transform:translateY(-2px);}
.btn-ghost.on-dark{color:#fff;border-color:var(--navy-line);}
.btn-ghost.on-dark:hover{border-color:#fff;background:rgba(255,255,255,.06);}
.btn-lg{padding:20px 38px;font-size:16px;}

/* ---- Image placeholders (tone-only dummy) ---- */
.ph{
  position:relative;border-radius:var(--r);overflow:hidden;
  background:
    repeating-linear-gradient(135deg, rgba(21,23,30,.045) 0 2px, transparent 2px 11px),
    linear-gradient(150deg,#ECE7DB,#F4F1E9 60%,#E7E0D0);
  border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;
  color:var(--muted);min-height:160px;
}
.ph::after{
  content:attr(data-label);
  font-family:var(--f-en);font-weight:500;font-size:12px;letter-spacing:.12em;
  text-transform:uppercase;color:#9a948a;
  padding:7px 14px;border:1px solid rgba(21,23,30,.12);border-radius:999px;
  background:rgba(255,255,255,.55);backdrop-filter:blur(2px);
  text-align:center;max-width:80%;
}
.ph.dark{
  background:
    repeating-linear-gradient(135deg, rgba(255,255,255,.05) 0 2px, transparent 2px 11px),
    linear-gradient(150deg,#1d2740,#141d30 60%,#0f1626);
  border-color:var(--navy-line);
}
.ph.dark::after{color:#8893ab;border-color:rgba(255,255,255,.16);background:rgba(255,255,255,.05);}
.ph.gold{
  background:
    repeating-linear-gradient(135deg, rgba(166,135,58,.10) 0 2px, transparent 2px 11px),
    linear-gradient(150deg,#efe6cd,#f5efdd 60%,#e9dcb9);
}

/* ---- Dark surface helper ---- */
.dark{background:var(--navy);color:#EDEAE2;}
.dark h1,.dark h2,.dark h3,.dark h4{color:#fff;}
.dark .muted,.dark .lead{color:#A9B0C0;}
.darker{background:var(--navy-2);color:#EDEAE2;}

/* ---- Misc ---- */
.muted{color:var(--muted);}
.gold-text{color:var(--gold-deep);}
.divider{height:1px;background:var(--line);border:0;margin:0;}
.tick{color:var(--gold-deep);font-weight:700;}

/* check list */
.checks{list-style:none;margin:0;padding:0;display:grid;gap:14px;}
.checks li{position:relative;padding-left:38px;font-size:clamp(15px,1.1vw,16.5px);line-height:1.7;}
.checks li::before{
  content:"";position:absolute;left:0;top:.2em;width:24px;height:24px;border-radius:50%;
  background:var(--gold-tint);border:1px solid var(--gold-soft);
}
.checks li::after{
  content:"";position:absolute;left:8px;top:.55em;width:8px;height:4px;
  border-left:2px solid var(--gold-deep);border-bottom:2px solid var(--gold-deep);
  transform:rotate(-45deg);
}
.checks.on-dark li::before{background:rgba(194,162,78,.16);border-color:rgba(194,162,78,.4);}

/* pills row */
.pills{display:flex;flex-wrap:wrap;gap:10px;}
.pill{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;font-weight:500;letter-spacing:.02em;
  padding:8px 16px;border-radius:999px;background:var(--paper-2);
  border:1px solid var(--line);color:var(--ink-soft);
}
.pill::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--gold);}
.pill.on-dark{background:rgba(255,255,255,.06);border-color:var(--navy-line);color:#cfd5e2;}

/* number index */
.idx{font-family:var(--f-en);font-weight:800;font-size:clamp(40px,5vw,70px);line-height:1;letter-spacing:-.02em;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;}

/* gradient emphasis text */
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;}
.reasons-em{font-size:clamp(34px,6.6vw,58px);line-height:1.2;display:inline-block;font-weight:900;}
.reasons-title .reasons-em{font-weight:900;}
.svc-em{font-size:clamp(34px,6.6vw,58px);line-height:1.2;display:inline-block;font-weight:900;}
.svc-title .svc-em{font-weight:900;}
.voice-em{font-size:clamp(34px,6.6vw,58px);line-height:1.2;display:inline-block;font-weight:900;}
.voice-title .voice-em{font-weight:900;}
.qa-em{font-size:clamp(34px,6.6vw,58px);line-height:1.2;display:inline-block;font-weight:900;}
.qa-title .qa-em{font-weight:900;}

[hidden]{display:none !important;}

/* reveal on scroll */
[data-reveal]{opacity:0;transform:translateY(22px);transition:opacity .7s cubic-bezier(.2,.7,.2,1), transform .7s cubic-bezier(.2,.7,.2,1);}
[data-reveal].in{opacity:1;transform:none;}
[data-reveal][data-delay="1"]{transition-delay:.08s;}
[data-reveal][data-delay="2"]{transition-delay:.16s;}
[data-reveal][data-delay="3"]{transition-delay:.24s;}
@media(prefers-reduced-motion:reduce){[data-reveal]{opacity:1;transform:none;transition:none;}}

/* nav active */
.nav a.active{color:var(--ink);}
.nav a.active::after{content:"";display:block;height:1.5px;background:var(--gold);margin-top:3px;}