/* Layout: one dark column. Hero states the news, details row, then RSVP, then the required About TEDx block. */
:root{
  --ink:#0B0B0B; --panel:#151515; --line:#2A2A2A; --red:#EB0028; --red-ink:#FF3A55;
  --white:#FFFFFF; --soft:#D9D9D9; --mute:#9A9A9A;
  --sans:"Helvetica Neue", Helvetica, Arial, sans-serif;
  --gutter:max(20px, env(safe-area-inset-left, 0px));
  color-scheme:dark;
}
*{box-sizing:border-box;margin:0;padding:0}
[hidden]{display:none!important}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{background:var(--ink);color:var(--white);font-family:var(--sans);font-size:17px;line-height:1.5;-webkit-font-smoothing:antialiased}
a{color:var(--white)}
.wrap{max-width:1080px;margin:0 auto;padding-left:var(--gutter);padding-right:max(20px, env(safe-area-inset-right, 0px))}

/* Header */
header{position:sticky;top:0;z-index:10;background:rgba(11,11,11,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
header .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-block:16px}
.logo{display:flex;align-items:flex-start;font-size:28px;line-height:1;letter-spacing:-.5px;text-decoration:none}
.logo .ted{font-weight:800;color:var(--red)}
.logo .x{font-weight:800;color:var(--red);font-size:15px;margin:1px 5px 0 1px}
.logo .city{font-weight:300;color:var(--white)}
nav{display:flex;gap:20px;align-items:center}
nav a{font-size:14px;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;text-decoration:none;color:var(--soft)}
nav a:hover{color:var(--white)}
nav .btn-sm{background:var(--red);color:var(--white);padding:10px 16px;border-radius:999px}
@media (max-width:560px){nav .hide-sm{display:none}}

/* Hero */
.hero{padding-block:72px 56px}
.kicker{display:inline-flex;align-items:center;gap:14px;font-size:15px;font-weight:700;letter-spacing:5px;text-transform:uppercase;color:var(--red-ink)}
.kicker::before{content:"";width:40px;height:4px;background:var(--red);border-radius:2px}
h1{margin-top:22px;font-size:clamp(44px,8vw,92px);font-weight:800;line-height:.98;letter-spacing:-.03em;text-wrap:balance}
.year{font-size:clamp(150px,31vw,340px);font-weight:800;line-height:.82;letter-spacing:-.05em;color:var(--red);margin-left:-.04em;margin-top:6px}
.invite{margin-top:34px;font-size:clamp(20px,2.6vw,28px);line-height:1.35;color:var(--soft);max-width:30ch}
.invite b{color:var(--white)}
.cta-row{margin-top:34px;display:flex;flex-wrap:wrap;gap:16px;align-items:center}
.btn{appearance:none;border:0;cursor:pointer;font:inherit;font-weight:800;font-size:18px;letter-spacing:.2px;background:var(--red);color:var(--white);padding:18px 30px;border-radius:999px;text-decoration:none;display:inline-flex;align-items:center;gap:10px}
.btn:hover{filter:brightness(1.08)}
.btn:focus-visible,.btn-ghost:focus-visible,input:focus-visible,nav a:focus-visible,.check input:focus-visible+span{outline:3px solid var(--white);outline-offset:3px}
.btn-ghost{appearance:none;cursor:pointer;font:inherit;font-weight:700;font-size:16px;background:transparent;color:var(--white);border:2px solid var(--line);padding:15px 24px;border-radius:999px;text-decoration:none;display:inline-flex;align-items:center;gap:10px}
.btn-ghost:hover{border-color:var(--mute)}
.btn[disabled]{opacity:.6;cursor:progress}

/* Details */
.details{margin-top:56px;border-top:1px solid var(--line);padding-top:32px;display:grid;grid-template-columns:1fr .8fr 1.4fr;gap:28px}
@media (max-width:720px){.details{grid-template-columns:1fr 1fr}.details .where{grid-column:1/-1}}
.label{font-size:13px;font-weight:700;letter-spacing:4px;text-transform:uppercase;color:var(--red-ink);margin-bottom:8px}
.value{font-size:clamp(22px,2.6vw,30px);font-weight:700;line-height:1.15}
.value small{display:block;font-size:17px;font-weight:400;color:var(--soft);margin-top:8px;line-height:1.4}

/* Countdown */
.countdown{margin-top:40px;display:flex;flex-wrap:wrap;gap:12px;align-items:stretch}
.cd-cell{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:14px 18px;min-width:86px;text-align:center}
.cd-num{font-size:34px;font-weight:800;font-variant-numeric:tabular-nums;line-height:1}
.cd-unit{font-size:11px;letter-spacing:2.5px;text-transform:uppercase;color:var(--mute);margin-top:6px}
.cd-note{align-self:center;color:var(--mute);font-size:15px;margin-left:4px}

/* RSVP */
section.block{padding-block:72px;border-top:1px solid var(--line)}
h2{font-size:clamp(34px,5vw,56px);font-weight:800;letter-spacing:-.02em;line-height:1.02;text-wrap:balance}
.lede{margin-top:14px;color:var(--soft);font-size:19px;max-width:56ch}
form{margin-top:36px;display:grid;gap:22px;max-width:760px}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:22px}
@media (max-width:640px){.row2{grid-template-columns:1fr}}
.field{display:grid;gap:8px;min-width:0}
.field label{font-size:14px;font-weight:700;letter-spacing:.3px}
.field label .opt{color:var(--mute);font-weight:400}
input[type=text],input[type=email],input[type=tel]{width:100%;font:inherit;font-size:18px;color:var(--white);background:var(--panel);border:1.5px solid var(--line);border-radius:12px;padding:15px 16px}
input::placeholder{color:#666}
input:hover{border-color:#3a3a3a}
input[aria-invalid=true]{border-color:var(--red)}
.err{color:var(--red-ink);font-size:14px;min-height:0}
fieldset{border:0;display:grid;gap:12px}
legend{font-size:14px;font-weight:700;letter-spacing:.3px;margin-bottom:12px}
.choices{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
@media (max-width:640px){.choices{grid-template-columns:1fr}}
.check{position:relative;display:flex;gap:14px;align-items:flex-start;background:var(--panel);border:1.5px solid var(--line);border-radius:14px;padding:16px;cursor:pointer}
.check:hover{border-color:#3a3a3a}
.check input{position:absolute;opacity:0;width:1px;height:1px}
.check .box{flex:none;width:22px;height:22px;border-radius:6px;border:2px solid #555;display:grid;place-items:center;margin-top:1px}
.check input:checked ~ .box{background:var(--red);border-color:var(--red)}
.check input:checked ~ .box::after{content:"";width:10px;height:6px;border-left:3px solid #fff;border-bottom:3px solid #fff;transform:rotate(-45deg) translate(1px,-1px)}
.check input:focus-visible ~ .box{outline:3px solid var(--white);outline-offset:2px}
.check:has(input:checked){border-color:var(--red)}
.check b{display:block;font-size:17px}
.check span.t{font-size:14px;color:var(--mute);line-height:1.4}
.rule-note{font-size:14px;color:var(--soft);background:#1d1012;border:1px solid #4a1820;border-radius:12px;padding:12px 14px}
.consent{background:transparent}
.consent span.t{color:var(--soft);font-size:15px}
.fine{font-size:13px;color:var(--mute);line-height:1.5}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.form-error{color:var(--red-ink);font-weight:700}

/* Success */
#done{margin-top:36px}
.done-grid{display:grid;grid-template-columns:minmax(0,380px) minmax(0,1fr);gap:40px;align-items:start}
@media (max-width:820px){.done-grid{grid-template-columns:1fr}}
#passImg{width:100%;max-width:380px;border-radius:16px;border:1px solid var(--line);display:block}
.done-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
.done-copy h3{font-size:clamp(30px,4vw,44px);font-weight:800;letter-spacing:-.02em;line-height:1.05}
.done-copy p{color:var(--soft);margin-top:12px;max-width:52ch}
.code{display:inline-block;margin-top:14px;font-variant-numeric:tabular-nums;font-weight:800;letter-spacing:2px;background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:8px 12px}
.demo{margin-top:18px;font-size:14px;color:#ffcc66}
.ios-tip{font-size:14px;color:var(--mute);margin-top:12px}

/* About */
.about-grid{margin-top:28px;display:grid;grid-template-columns:1fr 1fr;gap:40px}
@media (max-width:760px){.about-grid{grid-template-columns:1fr}}
.about-grid h3{font-size:20px;font-weight:800;margin-bottom:10px}
.about-grid p{color:var(--soft);max-width:60ch}
.about-grid a{color:var(--red-ink);font-weight:700}

footer{border-top:1px solid var(--line);padding-block:36px 48px;color:var(--mute);font-size:14px}
footer .wrap{display:grid;gap:10px}
footer .rx{color:var(--red);font-weight:800}

/* ---- Shared by the form pages (Speak, Nominate, Sponsor, Volunteer) ---- */
nav .navlinks{display:flex;gap:20px;align-items:center}
nav a[aria-current=page]{color:var(--white)}
@media (max-width:760px){nav .navlinks{display:none}}
.page-hero{padding-block:64px 8px}
.page-hero h1{font-size:clamp(40px,7vw,76px)}
.page-hero .lede{font-size:clamp(18px,2.2vw,22px)}
select,textarea{width:100%;font:inherit;font-size:18px;color:var(--white);background:var(--panel);border:1.5px solid var(--line);border-radius:12px;padding:15px 16px}
select{appearance:none;background-image:linear-gradient(45deg,transparent 50%,var(--mute) 50%),linear-gradient(135deg,var(--mute) 50%,transparent 50%);background-position:calc(100% - 22px) 50%,calc(100% - 16px) 50%;background-size:6px 6px;background-repeat:no-repeat;padding-right:44px}
textarea{min-height:120px;resize:vertical;line-height:1.45}
select:hover,textarea:hover{border-color:#3a3a3a}
select:focus-visible,textarea:focus-visible{outline:3px solid var(--white);outline-offset:3px}
select[aria-invalid=true],textarea[aria-invalid=true]{border-color:var(--red)}
.hint{font-size:14px;color:var(--mute)}
.form-section{font-size:13px;font-weight:700;letter-spacing:4px;text-transform:uppercase;color:var(--red-ink);margin-top:10px;border-top:1px solid var(--line);padding-top:26px}
.choices.one{grid-template-columns:1fr}
.success{max-width:760px;margin-top:36px;background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:32px}
.success h2{font-size:clamp(30px,4vw,44px)}
.success p{color:var(--soft);margin-top:12px}
.get-involved{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;margin-top:32px}
@media (max-width:900px){.get-involved{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:520px){.get-involved{grid-template-columns:1fr}}
.gi-card{display:flex;flex-direction:column;gap:8px;background:var(--panel);border:1.5px solid var(--line);border-radius:16px;padding:22px;text-decoration:none;color:var(--white);min-width:0}
.gi-card:hover{border-color:var(--red)}
.gi-card b{font-size:20px}
.gi-card span{color:var(--mute);font-size:15px}
.gi-card em{font-style:normal;color:var(--red-ink);font-weight:700;font-size:14px;margin-top:auto;padding-top:8px}
.closed{color:var(--soft);font-size:19px;margin-top:24px}

/* ---- Bilingual labels, section notes, theme intro, "Other" box ---- */
.es{display:block;font-weight:400;color:var(--mute);font-size:14px;letter-spacing:0;text-transform:none;margin-top:2px}
.form-section .es{display:inline;margin-left:8px;color:var(--mute)}
.section-note{color:var(--soft);font-size:16px;max-width:64ch;margin-top:-6px}
.section-note .es{display:inline;font-size:15px}
.intro{max-width:760px;margin-top:28px;background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:26px 28px}
.intro p{color:var(--soft);margin-top:12px;font-size:17px;line-height:1.6}
.intro-theme{font-size:clamp(26px,3.4vw,36px);font-weight:800;letter-spacing:.01em;color:var(--white)}
.intro details{margin-top:18px;border-top:1px solid var(--line);padding-top:14px}
.intro summary{cursor:pointer;font-weight:700;color:var(--red-ink)}
.intro details .intro-theme{margin-top:14px}
.other-field{margin-top:12px;max-width:420px}