/* ==========================================================================
   TACK together - site.css
   Tokens are the source of truth. Do not introduce colors, sizes, or fonts
   outside this set. Reference: TACK Brand Guidelines v1.0, section 03/04.
   ========================================================================== */

:root{
  /* color */
  --deep:     #0A2C4A;  /* primary ground - ~70% */
  --deep-2:   #071E33;  /* panels, second surface */
  --sea:      #7FB6C4;  /* secondary - ~20% */
  --sea-ink:  #4C8B9C;  /* sea glass on white, for contrast */
  --scarlet:  #ED3024;  /* accent ONLY - ~8% */
  --white:    #FFFFFF;
  --paper:    #EEF2F7;  /* light section ground */
  --ink:      #1F2A3A;  /* body text on light */
  --muted:    #64748B;

  /* type */
  --display: 'Space Grotesk', Archivo, sans-serif;
  --body:    'Hanken Grotesk', 'Source Sans 3', sans-serif;

  /* scale - mobile / desktop */
  --h1: clamp(2.5rem, 9vw, 5rem);
  --h2: clamp(1.75rem, 5vw, 2.75rem);
  --h3: clamp(1.25rem, 3vw, 1.6rem);
  --body-size: clamp(1rem, 1.5vw, 1.125rem);
  --eyebrow: 0.8125rem;

  /* rhythm */
  --gutter: clamp(1.25rem, 5vw, 4.5rem);
  --section-y: clamp(4rem, 10vw, 8rem);
  --max: 1200px;

  /* Height of the tacking-course band. Any section carrying a course reserves
     exactly this much extra bottom padding, so a line can never reach type. */
  --course-h: clamp(90px, 12vw, 150px);

  --hair: rgba(10,44,74,.12);
  --hair-dark: rgba(127,182,196,.22);
}

/* --- reset ------------------------------------------------------------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{margin:0;background:var(--white);color:var(--ink);
  font:400 var(--body-size)/1.6 var(--body);-webkit-font-smoothing:antialiased;}
img{max-width:100%;height:auto;display:block;}
a{color:inherit;}
button{font:inherit;}
h1,h2,h3,h4,p,figure{margin:0;}
ul,ol{margin:0;padding:0;list-style:none;}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms !important;transition-duration:.001ms !important;}
  html{scroll-behavior:auto;}
}

/* Every interactive element needs a visible focus ring. */
a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{
  outline:3px solid var(--scarlet);outline-offset:3px;border-radius:2px;}
.on-deep a:focus-visible,.on-deep button:focus-visible,.on-deep input:focus-visible{
  outline-color:var(--sea);}

.skip{position:absolute;left:-9999px;}
.skip:focus{left:var(--gutter);top:12px;z-index:100;background:var(--scarlet);
  color:#fff;padding:12px 18px;border-radius:6px;font-weight:700;}

/* --- type -------------------------------------------------------------- */
h1,h2,h3{font-family:var(--display);font-weight:700;letter-spacing:-.02em;
  text-transform:uppercase;line-height:1.02;}
h1{font-size:var(--h1);}
h2{font-size:var(--h2);line-height:1.06;}
h3{font-size:var(--h3);line-height:1.16;letter-spacing:-.01em;}

.eyebrow{display:inline-block;font-family:var(--body);font-size:var(--eyebrow);
  font-weight:700;letter-spacing:.18em;text-transform:uppercase;color:var(--scarlet);}
.on-deep .eyebrow{color:var(--sea);}

.lead{font-size:clamp(1.0625rem,2vw,1.3125rem);line-height:1.55;color:var(--ink);
  max-width:56ch;}
.on-deep .lead{color:rgba(255,255,255,.88);}
.muted{color:var(--muted);}
.on-deep .muted{color:var(--sea);}

/* --- layout ------------------------------------------------------------ */
.wrap{max-width:var(--max);margin-inline:auto;padding-inline:var(--gutter);}
.sec{padding-block:var(--section-y);position:relative;overflow:hidden;}
.sec.deep{background:var(--deep);color:var(--white);}
.sec.deep-2{background:var(--deep-2);color:var(--white);}
.sec.paper{background:var(--paper);}
.sec-head{max-width:60ch;}
.sec-head h2{margin-top:16px;}
.sec-head .lead{margin-top:18px;}

/* --- the tacking course motif ------------------------------------------ */
/* Three lines, exactly one scarlet. Confined to a bottom band whose height a
   course-bearing section adds to its own bottom padding, so a line can never
   cross type at any width. non-scaling-stroke keeps every stroke above the
   6px floor no matter how far the viewBox is scaled down.                  */
.course{position:absolute;inset:auto 0 0 0;width:100%;height:var(--course-h);
  pointer-events:none;z-index:0;}
.course path{fill:none;stroke-linejoin:round;vector-effect:non-scaling-stroke;}
.course .c-sea{stroke:var(--sea);stroke-width:7;opacity:.30;}
.course .c-red{stroke:var(--scarlet);stroke-width:8;opacity:.85;}
.course .c-sea-2{stroke:var(--sea);stroke-width:7;opacity:.20;}
.sec > .wrap{position:relative;z-index:1;}

/* reserve room for the band */
.sec.has-course{padding-bottom:calc(var(--section-y) + var(--course-h));}

/* anchored sections must clear the sticky header */
[id]{scroll-margin-top:96px;}

/* --- buttons ----------------------------------------------------------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;
  min-height:48px;padding:14px 28px;border:2px solid transparent;border-radius:999px;
  font-family:var(--body);font-weight:700;font-size:.9375rem;letter-spacing:.04em;
  text-transform:uppercase;text-decoration:none;cursor:pointer;
  transition:transform .15s ease,background .15s ease,color .15s ease;}
.btn:hover{transform:translateY(-2px);}
.btn-scarlet{background:var(--scarlet);color:#fff;border-color:var(--scarlet);}
.btn-scarlet:hover{background:#d4271c;border-color:#d4271c;}
.btn-ghost{background:transparent;color:var(--white);border-color:rgba(255,255,255,.45);}
.btn-ghost:hover{border-color:var(--white);}
.btn-navy{background:var(--deep);color:#fff;border-color:var(--deep);}
.btn-navy:hover{background:var(--deep-2);}
.btn-row{display:flex;flex-wrap:wrap;gap:14px;margin-top:34px;}

/* --- header ------------------------------------------------------------ */
.site-head{position:sticky;top:0;z-index:50;background:var(--deep);
  border-bottom:1px solid var(--hair-dark);}
.head-in{max-width:var(--max);margin-inline:auto;padding:14px var(--gutter);
  display:flex;align-items:center;gap:20px;}
.brand{display:flex;align-items:center;flex:0 0 auto;text-decoration:none;
  padding-block:4px;}
/* 125px keeps the lockup above the ~120px floor where "together" goes muddy.
   Width and height are both explicit so the header never shifts on load. */
.brand img{width:125px;height:58px;}
.head-nav{margin-left:auto;display:flex;align-items:center;gap:30px;}
.head-nav a{font-family:var(--body);font-size:.875rem;font-weight:600;
  letter-spacing:.1em;text-transform:uppercase;color:rgba(255,255,255,.82);
  text-decoration:none;transition:color .15s ease;}
.head-nav a:hover,.head-nav a[aria-current="page"]{color:var(--white);}
.head-cta{flex:0 0 auto;}
.head-cta .btn{min-height:44px;padding:11px 22px;font-size:.8125rem;}

.menu-btn{display:none;background:none;border:1px solid rgba(255,255,255,.35);
  border-radius:8px;color:#fff;width:44px;height:44px;align-items:center;
  justify-content:center;cursor:pointer;}
.menu-btn svg{width:20px;height:20px;}
.mobile-nav{display:none;background:var(--deep-2);border-bottom:1px solid var(--hair-dark);}
.mobile-nav ul{padding:8px var(--gutter) 20px;}
.mobile-nav a{display:block;padding:14px 0;font-family:var(--body);font-weight:600;
  font-size:1rem;letter-spacing:.06em;text-transform:uppercase;color:#fff;
  text-decoration:none;border-bottom:1px solid var(--hair-dark);}
.mobile-nav[data-open="true"]{display:block;}

@media (max-width:760px){
  .head-nav{display:none;}
  .menu-btn{display:inline-flex;margin-left:auto;}
  .head-cta .btn{padding:11px 16px;font-size:.75rem;}
  /* single-line wordmark, held above the 90px digital minimum */
  .brand img{width:96px;height:33px;}
}

/* --- hero -------------------------------------------------------------- */
.hero{background:var(--deep);color:var(--white);position:relative;overflow:hidden;
  padding-top:clamp(3.5rem,9vw,7rem);
  padding-bottom:calc(clamp(3rem,8vw,5rem) + var(--course-h));}
.hero.compact{padding-top:clamp(3rem,7vw,5rem);}
.hero h1{margin-top:20px;max-width:14ch;}
.hero .lead{margin-top:26px;}
.hero .when{margin-top:30px;font-family:var(--display);font-weight:500;
  font-size:clamp(1rem,2.2vw,1.25rem);letter-spacing:.02em;color:var(--sea);
  text-transform:uppercase;}

/* --- format rows ------------------------------------------------------- */
.fmt{margin-top:52px;display:grid;gap:0;border-top:1px solid var(--hair-dark);}
.fmt-row{display:grid;grid-template-columns:auto 1fr;gap:clamp(18px,4vw,44px);
  align-items:baseline;padding:clamp(22px,3.5vw,32px) 0;
  border-bottom:1px solid var(--hair-dark);}
.fmt-num{font-family:var(--display);font-weight:700;font-size:clamp(1.5rem,4vw,2.25rem);
  color:var(--scarlet);letter-spacing:-.02em;min-width:2.5ch;}
.fmt-row p{font-size:clamp(1.0625rem,2vw,1.25rem);color:rgba(255,255,255,.9);
  max-width:52ch;}

/* --- speaker cards ----------------------------------------------------- */
.spk-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:clamp(14px,2vw,24px);
  margin-top:48px;}
.spk-card{text-decoration:none;color:inherit;display:block;}
.spk-shot{position:relative;aspect-ratio:4/5;overflow:hidden;border-radius:12px;
  background:var(--paper);}
.spk-shot img{width:100%;height:100%;object-fit:cover;object-position:50% 22%;
  transition:transform .4s ease;}
.spk-card:hover .spk-shot img{transform:scale(1.03);}
.spk-badge{position:absolute;top:10px;left:10px;background:var(--deep);color:#fff;
  font-family:var(--body);font-size:.6875rem;font-weight:700;letter-spacing:.12em;
  text-transform:uppercase;padding:6px 10px;border-radius:6px;}
.spk-rule{height:3px;background:var(--sea);margin-top:14px;width:34px;}
.spk-name{font-family:var(--display);font-weight:700;text-transform:uppercase;
  letter-spacing:-.01em;font-size:1.0625rem;line-height:1.15;margin-top:12px;
  min-height:2.3em;}          /* reserve height so company lines baseline-align */
.spk-org{font-size:.875rem;color:var(--muted);line-height:1.4;}
.on-deep .spk-org{color:var(--sea);}

@media (max-width:1080px){.spk-grid{grid-template-columns:repeat(3,1fr);}}
@media (max-width:640px){
  .spk-grid{grid-template-columns:repeat(2,1fr);gap:14px;}
  .spk-name{font-size:.9375rem;min-height:2.4em;}
}

/* --- speaker detail ---------------------------------------------------- */
.spk-hero{display:grid;grid-template-columns:340px 1fr;gap:clamp(28px,5vw,60px);
  align-items:start;}
.spk-hero .shot{border-radius:14px;overflow:hidden;aspect-ratio:4/5;background:var(--deep-2);}
.spk-hero .shot img{width:100%;height:100%;object-fit:cover;object-position:50% 22%;}
.spk-bio{margin-top:26px;display:flex;flex-direction:column;gap:18px;
  font-size:clamp(1rem,1.8vw,1.125rem);line-height:1.65;color:rgba(255,255,255,.88);}
@media (max-width:820px){
  .spk-hero{grid-template-columns:1fr;}
  .spk-hero .shot{max-width:280px;}
}

/* --- signup ------------------------------------------------------------ */
.signup{background:var(--deep-2);color:#fff;}
.signup .mast{width:clamp(240px,32vw,420px);height:auto;aspect-ratio:5.129;
  margin-bottom:26px;}
.signup h2{max-width:18ch;}
.form-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px;max-width:540px;}
.form-row input[type="email"],.form-row input[type="text"]{
  flex:1 1 260px;min-height:52px;padding:14px 18px;border-radius:999px;
  border:2px solid rgba(127,182,196,.4);background:rgba(255,255,255,.06);
  color:#fff;font:400 1rem var(--body);}
.form-row input::placeholder{color:rgba(255,255,255,.5);}
.form-row input:focus{border-color:var(--sea);}
/* newsletter signup: first + last side by side, email and button full width */
.signup-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;max-width:540px;
  margin-top:28px;}
.signup-grid .full{grid-column:1/-1;}
.signup-grid input{width:100%;min-height:52px;padding:14px 18px;border-radius:999px;
  border:2px solid rgba(127,182,196,.4);background:rgba(255,255,255,.06);
  color:#fff;font:400 1rem var(--body);}
.signup-grid input::placeholder{color:rgba(255,255,255,.5);}
.signup-grid input:focus{border-color:var(--sea);}
.signup-grid .btn{width:100%;}
@media(max-width:460px){.signup-grid{grid-template-columns:1fr;}}

.form-note{margin-top:14px;font-size:.875rem;color:var(--sea);}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden;}
.form-msg{margin-top:18px;font-size:.9375rem;font-weight:600;min-height:1.4em;}
.form-msg[data-state="ok"]{color:var(--sea);}
.form-msg[data-state="err"]{color:#FF8A80;}
.field-err{border-color:var(--scarlet) !important;}

/* light-ground form (apply to speak) */
.form-light input[type="email"],.form-light input[type="text"]{
  background:var(--white);border-color:var(--hair);color:var(--ink);}
.form-light input::placeholder{color:var(--muted);}
.form-light .form-note{color:var(--muted);}
.form-light .form-msg[data-state="ok"]{color:var(--sea-ink);}
.form-light .form-msg[data-state="err"]{color:var(--scarlet);}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;max-width:640px;margin-top:28px;}
.form-grid .full{grid-column:1/-1;}
.form-grid input{width:100%;min-height:52px;padding:14px 18px;border-radius:12px;
  border:2px solid var(--hair);background:var(--white);color:var(--ink);
  font:400 1rem var(--body);}
@media (max-width:560px){.form-grid{grid-template-columns:1fr;}}

/* --- agenda ------------------------------------------------------------ */
.ag-row{display:grid;grid-template-columns:110px 1fr;gap:clamp(16px,3vw,36px);
  padding:22px 0;border-bottom:1px solid var(--hair);align-items:start;}
.ag-time{font-family:var(--display);font-weight:700;font-size:1rem;color:var(--scarlet);
  letter-spacing:.02em;padding-top:2px;}
.ag-title{font-family:var(--display);font-weight:700;text-transform:uppercase;
  font-size:clamp(1.0625rem,2.2vw,1.25rem);letter-spacing:-.01em;line-height:1.2;}
.ag-detail{margin-top:7px;font-size:.9375rem;color:var(--muted);line-height:1.5;}
.ag-tag{display:inline-block;margin-bottom:8px;font-family:var(--body);font-size:.6875rem;
  font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--sea-ink);}
.ag-row.feature{background:var(--paper);border-radius:14px;padding:22px 20px;
  border-bottom:none;margin-top:10px;}
@media (max-width:560px){
  .ag-row{grid-template-columns:1fr;gap:4px;}
  .ag-time{padding-top:0;}
}

/* --- sponsor logos ----------------------------------------------------- */
.logo-wall{display:flex;flex-wrap:wrap;justify-content:center;gap:22px;margin-top:44px;}
.logo-card{background:#fff;border:1px solid var(--hair);border-radius:16px;
  padding:26px 30px 22px;display:flex;flex-direction:column;align-items:center;
  gap:16px;width:250px;}
.logo-card .logo-box{height:88px;width:100%;display:flex;align-items:center;
  justify-content:center;}
.logo-card .logo-box img{max-height:88px;max-width:200px;object-fit:contain;}
.logo-card .cat{font-family:var(--body);font-size:.6875rem;font-weight:700;
  letter-spacing:.14em;text-transform:uppercase;color:var(--muted);}
@media (max-width:560px){.logo-card{width:100%;max-width:320px;}}

/* --- panels / cards on light ------------------------------------------- */
.card-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
  gap:clamp(16px,2.5vw,24px);margin-top:44px;}
.card{background:var(--paper);border-radius:16px;padding:clamp(24px,3vw,32px);}
.sec.paper .card{background:var(--white);}
.card h3{margin-bottom:12px;}
.card p{font-size:.9375rem;line-height:1.6;color:var(--muted);}
.card .num{font-family:var(--display);font-weight:700;font-size:2rem;
  color:var(--scarlet);line-height:1;margin-bottom:14px;}

/* --- needs copy marker (impossible to ship by accident) ---------------- */
.needs-copy{display:block;background:repeating-linear-gradient(45deg,
  #FFE8E6,#FFE8E6 12px,#FFD6D2 12px,#FFD6D2 24px);
  border:3px dashed var(--scarlet);border-radius:10px;color:#8B1A12;
  font-family:var(--body);font-weight:700;font-size:.9375rem;letter-spacing:.02em;
  padding:18px 22px;margin:8px 0;text-transform:none;}

/* --- footer ------------------------------------------------------------ */
.foot{background:var(--deep-2);color:#fff;padding:clamp(56px,8vw,84px) 0 36px;}
.foot-top{display:grid;grid-template-columns:1.5fr 1fr 1.4fr;gap:clamp(28px,5vw,56px);}
.foot img.mark{width:180px;height:84px;}
.foot h4{font-family:var(--body);font-size:.75rem;font-weight:700;letter-spacing:.16em;
  text-transform:uppercase;color:var(--sea);margin-bottom:16px;}
.foot-links{display:flex;flex-direction:column;gap:11px;}
.foot-links a{font-size:.9375rem;color:rgba(255,255,255,.86);text-decoration:none;}
.foot-links a:hover{color:#fff;text-decoration:underline;}
.foot-tag{margin-top:18px;font-family:var(--display);font-weight:700;
  text-transform:uppercase;font-size:1rem;letter-spacing:-.01em;color:#fff;}
.foot-tag .red{color:var(--scarlet);}
.foot-bottom{margin-top:clamp(36px,6vw,56px);padding-top:24px;
  border-top:1px solid var(--hair-dark);display:flex;flex-wrap:wrap;gap:12px 26px;
  align-items:center;justify-content:space-between;}
.foot-bottom p{font-size:.8125rem;color:rgba(255,255,255,.55);}
.host-credit{font-size:.8125rem;color:rgba(255,255,255,.55);}
@media (max-width:820px){.foot-top{grid-template-columns:1fr;}}

/* --- utilities --------------------------------------------------------- */
.center{text-align:center;}
.center .lead,.center .sec-head{margin-inline:auto;}
.mt-s{margin-top:18px;}
.mt-m{margin-top:32px;}
.link-more{display:inline-flex;align-items:center;gap:8px;margin-top:36px;
  font-family:var(--body);font-weight:700;font-size:.9375rem;letter-spacing:.06em;
  text-transform:uppercase;color:var(--scarlet);text-decoration:none;}
.on-deep .link-more{color:var(--sea);}
.link-more:hover{text-decoration:underline;}