:root {
    --color-cyan: #6DC9E0;
    --color-cyan-bright: #8AD7EC;
    --color-cyan-deep: #3FA3BD;
    --color-ink: #060A11;
    --color-night: #0B1320;
    --color-slate: #131C2A;
    --color-slate-2: #1B2638;
    --color-steel: #2A3445;
    --color-mist: #C7D0DC;
    --color-fog: #8895A8;
    --color-line: rgba(255, 255, 255, 0.08);
    --color-line-strong: rgba(255, 255, 255, 0.18);
    --color-white: #FFFFFF;
    --color-light-bg: #F4F6F9;
    --color-light-2: #E8ECF1;
    --color-light-text: #1A2230;
    --shadow-deep: 0 32px 80px rgba(0, 0, 0, 0.45);
    --shadow-soft: 0 18px 40px rgba(0, 0, 0, 0.28);
    --shadow-light: 0 4px 18px rgba(11, 19, 32, 0.08);
    --radius-large: 22px;
    --radius-medium: 14px;
    --radius-small: 8px;
    --site-width: min(1200px, calc(100vw - 32px));
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
    color: var(--color-mist);
    background: var(--color-night);
    background-image:
        radial-gradient(1200px 600px at 80% -10%, rgba(109, 201, 224, 0.10), transparent 60%),
        radial-gradient(800px 400px at -10% 30%, rgba(109, 201, 224, 0.06), transparent 60%),
        linear-gradient(180deg, #0B1320 0%, #060A11 100%);
    background-attachment: fixed;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    display: block;
}

a {
    color: var(--color-cyan);
    text-decoration: none;
    transition: color 0.18s ease;
}

a:hover {
    color: var(--color-cyan-bright);
}

p, ul, ol, fieldset {
    margin: 0;
}

h1, h2, h3 {
    margin: 0;
    color: var(--color-white);
    font-family: 'Barlow Condensed', 'Inter', sans-serif;
    font-weight: 700;
    line-height: 1.05;
    letter-spacing: 0.005em;
    text-transform: uppercase;
}

h1 {
    font-size: clamp(2.5rem, 6vw, 4.75rem);
    letter-spacing: -0.005em;
}

h2 {
    font-size: clamp(2rem, 4vw, 3.25rem);
}

h3 {
    font-size: 1.35rem;
    letter-spacing: 0.01em;
}

.site-shell {
    width: var(--site-width);
    margin: 0 auto;
}

/* Header — light surface so the black BDT logo is visible */
.site-header {
    position: sticky;
    top: 0;
    z-index: 30;
    background: var(--color-light-bg);
    border-bottom: 1px solid var(--color-light-2);
    box-shadow: var(--shadow-light);
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 18px 0;
}

.brand-mark {
    display: inline-flex;
    align-items: center;
    gap: 14px;
    color: var(--color-light-text);
}

.brand-mark img {
    height: 44px;
    width: auto;
    color: var(--color-light-text);
}

.site-nav {
    display: inline-flex;
    align-items: center;
    gap: 28px;
}

.site-nav a {
    color: var(--color-light-text);
    font-weight: 600;
    font-size: 0.92rem;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    position: relative;
}

.site-nav a:hover {
    color: var(--color-cyan-deep);
}

.site-nav a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -8px;
    width: 0;
    height: 2px;
    background: var(--color-cyan);
    transition: width 0.22s ease;
}

.site-nav a:hover::after {
    width: 100%;
}

/* Eyebrow */
.eyebrow {
    margin: 0 0 14px;
    color: var(--color-cyan);
    text-transform: uppercase;
    letter-spacing: 0.22em;
    font-size: 0.78rem;
    font-weight: 700;
}

.eyebrow--bright {
    color: var(--color-cyan-bright);
}

/* Buttons */
.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    min-height: 54px;
    padding: 0 28px;
    border-radius: 4px;
    font-weight: 700;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.16em;
    border: 1px solid transparent;
    cursor: pointer;
    transition: transform 0.18s ease, background-color 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease, color 0.18s ease;
    text-decoration: none;
}

.button:hover {
    transform: translateY(-1px);
}

.button--primary {
    color: var(--color-ink);
    background: var(--color-cyan);
    box-shadow: 0 12px 28px rgba(109, 201, 224, 0.28);
}

.button--primary:hover {
    background: var(--color-cyan-bright);
    color: var(--color-ink);
    box-shadow: 0 16px 36px rgba(109, 201, 224, 0.42);
}

.button--secondary {
    color: var(--color-white);
    background: transparent;
    border-color: var(--color-cyan);
}

.button--secondary:hover {
    background: rgba(109, 201, 224, 0.12);
    color: var(--color-white);
}

.button--ghost {
    color: var(--color-white);
    border-color: rgba(255, 255, 255, 0.32);
    background: rgba(255, 255, 255, 0.06);
    backdrop-filter: blur(6px);
}

.button--ghost:hover {
    border-color: var(--color-cyan);
    color: var(--color-white);
    background: rgba(109, 201, 224, 0.10);
}

.button--with-icon svg {
    display: block;
    flex-shrink: 0;
}

.button--full {
    width: 100%;
}

/* Hero — uses the photo background extracted from the BDT flyer */
.hero {
    position: relative;
    overflow: hidden;
    min-height: calc(100vh - 80px);
    display: flex;
    align-items: stretch;
    isolation: isolate;
}

.hero__image,
.hero__overlay {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.hero__image {
    background-image: url('/assets/images/hero-bg.jpg');
    background-size: cover;
    background-position: center left;
    transform: scale(1.02);
    filter: saturate(1.05);
}

.hero__overlay {
    background:
        linear-gradient(90deg, rgba(6, 10, 17, 0.92) 0%, rgba(6, 10, 17, 0.72) 38%, rgba(6, 10, 17, 0.20) 65%, rgba(6, 10, 17, 0.55) 100%),
        linear-gradient(180deg, rgba(6, 10, 17, 0.20) 0%, rgba(6, 10, 17, 0.55) 100%);
}

.hero__inner {
    position: relative;
    z-index: 1;
    display: grid;
    gap: 32px;
    align-items: center;
    padding: 112px 0 96px;
}

.hero__content {
    max-width: 820px;
}

.hero h1 {
    color: var(--color-white);
    text-shadow: 0 4px 24px rgba(0, 0, 0, 0.45);
}

.hero__lead {
    margin-top: 24px;
    font-size: 1.08rem;
    color: rgba(231, 239, 248, 0.88);
    max-width: 620px;
    text-shadow: 0 2px 12px rgba(0, 0, 0, 0.35);
}

.hero__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 32px;
}

.hero__highlights {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 32px;
    padding: 0;
}

.hero__highlights li {
    padding: 9px 16px;
    border-radius: 4px;
    background: rgba(11, 19, 32, 0.55);
    border: 1px solid rgba(109, 201, 224, 0.32);
    color: var(--color-mist);
    font-size: 0.82rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    backdrop-filter: blur(4px);
}


/* Section base */
.section {
    padding: 96px 0;
    position: relative;
}

.section--dark {
    background:
        radial-gradient(800px 400px at 90% 0%, rgba(109, 201, 224, 0.07), transparent 60%),
        linear-gradient(180deg, #0A1220 0%, #0B1320 100%);
    border-top: 1px solid var(--color-line);
    border-bottom: 1px solid var(--color-line);
}

.section--accent {
    background:
        linear-gradient(180deg, rgba(109, 201, 224, 0.04) 0%, transparent 100%),
        linear-gradient(180deg, #0B1320 0%, #0A1220 100%);
    border-top: 1px solid var(--color-line);
    border-bottom: 1px solid var(--color-line);
}

.section--download {
    padding: 80px 0;
}

.section--rules-teaser {
    padding: 80px 0 96px;
}

.section--light {
    background: transparent;
}

.section-copy {
    display: grid;
    gap: 16px;
}

.section-copy--centered {
    max-width: 720px;
    margin: 0 auto;
    text-align: center;
}

.section-copy__lead {
    color: rgba(231, 239, 248, 0.82);
    font-size: 1.05rem;
    max-width: 64ch;
}

.section-copy--centered .section-copy__lead {
    margin-left: auto;
    margin-right: auto;
}

.section-copy p {
    color: rgba(231, 239, 248, 0.78);
    max-width: 64ch;
}

/* Prize section */
.prize-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.35fr);
    gap: 56px;
    align-items: start;
}

.prize-value {
    display: inline-grid;
    gap: 4px;
    margin-top: 10px;
    padding: 18px 24px;
    border-left: 3px solid var(--color-cyan);
    background: rgba(109, 201, 224, 0.06);
    border-radius: 0 var(--radius-small) var(--radius-small) 0;
}

.prize-value__label {
    color: var(--color-fog);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    font-weight: 700;
}

.prize-value__amount {
    font-family: 'Barlow Condensed', sans-serif;
    font-size: clamp(2.25rem, 4vw, 2.75rem);
    color: var(--color-white);
    font-weight: 700;
    line-height: 1;
    letter-spacing: 0.01em;
}

.prize-grid {
    display: grid;
    gap: 18px;
}

.prize-card {
    position: relative;
    padding: 28px 28px 28px 36px;
    border-radius: var(--radius-medium);
    background: linear-gradient(160deg, rgba(27, 38, 56, 0.7), rgba(19, 28, 42, 0.7));
    border: 1px solid var(--color-line);
    box-shadow: var(--shadow-soft);
    transition: border-color 0.22s ease, transform 0.22s ease;
}

.prize-card:hover {
    border-color: rgba(109, 201, 224, 0.42);
    transform: translateY(-2px);
}

.prize-card__accent {
    position: absolute;
    top: 18px;
    bottom: 18px;
    left: 0;
    width: 3px;
    background: var(--color-cyan);
    border-radius: 0 2px 2px 0;
}

.prize-card__name {
    color: var(--color-white);
    font-size: 1.4rem;
    margin-bottom: 4px;
}

.prize-card__spec {
    margin: 0 0 12px;
    color: var(--color-cyan);
    font-weight: 700;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.prize-card__copy {
    color: rgba(231, 239, 248, 0.78);
    margin: 0;
    font-size: 0.98rem;
}

/* Requirements section */
.requirements-layout {
    display: grid;
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    gap: 56px;
    align-items: start;
}

.requirements-card {
    padding: 36px;
    border-radius: var(--radius-medium);
    background: linear-gradient(160deg, rgba(27, 38, 56, 0.85), rgba(11, 19, 32, 0.92));
    border: 1px solid var(--color-line-strong);
    box-shadow: var(--shadow-soft);
}

.requirements-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 12px;
}

.requirements-list li {
    position: relative;
    padding-left: 28px;
    color: var(--color-mist);
    font-size: 1rem;
    line-height: 1.5;
}

.requirements-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.6em;
    width: 16px;
    height: 2px;
    background: var(--color-cyan);
}

.requirements-card__footnote {
    margin: 24px 0 0;
    padding-top: 20px;
    border-top: 1px solid var(--color-line);
    color: var(--color-fog);
    font-size: 0.88rem;
    font-style: italic;
}

/* Download CTA */
.download-card {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 32px;
    align-items: center;
    padding: 36px 40px;
    border-radius: var(--radius-medium);
    background: linear-gradient(120deg, rgba(27, 38, 56, 0.88), rgba(11, 19, 32, 0.92));
    border: 1px solid rgba(109, 201, 224, 0.28);
    box-shadow: var(--shadow-soft);
    position: relative;
    overflow: hidden;
}

.download-card::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        radial-gradient(600px 200px at 100% 0%, rgba(109, 201, 224, 0.10), transparent 60%);
    pointer-events: none;
}

.download-card__copy {
    position: relative;
    display: grid;
    gap: 12px;
}

.download-card__copy .eyebrow {
    margin-bottom: 0;
}

/* Teaser card */
.teaser-card {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 32px;
    align-items: center;
    padding: 36px 40px;
    border-radius: var(--radius-medium);
    background: linear-gradient(120deg, rgba(27, 38, 56, 0.70), rgba(11, 19, 32, 0.78));
    border: 1px solid var(--color-line);
    box-shadow: var(--shadow-soft);
    position: relative;
    overflow: hidden;
}

.teaser-card > div {
    display: grid;
    gap: 12px;
    position: relative;
}

.teaser-card .eyebrow {
    margin-bottom: 0;
}

/* Entry form section */
.section--entry {
    background:
        linear-gradient(180deg, rgba(109, 201, 224, 0.04) 0%, transparent 100%),
        linear-gradient(180deg, #0B1320 0%, #0A1220 100%);
    border-top: 1px solid var(--color-line);
    border-bottom: 1px solid var(--color-line);
}

.entry-layout {
    display: grid;
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: 56px;
    align-items: start;
}

.entry-side {
    margin-top: 8px;
    padding: 22px 24px;
    border-radius: var(--radius-medium);
    background: rgba(109, 201, 224, 0.06);
    border: 1px solid rgba(109, 201, 224, 0.18);
}

.entry-side__eyebrow {
    margin: 0 0 12px;
    color: var(--color-cyan);
    text-transform: uppercase;
    letter-spacing: 0.18em;
    font-size: 0.76rem;
    font-weight: 700;
}

.entry-side__list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 10px;
}

.entry-side__list li {
    position: relative;
    padding-left: 24px;
    color: var(--color-mist);
    font-size: 0.95rem;
}

.entry-side__list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.6em;
    width: 14px;
    height: 2px;
    background: var(--color-cyan);
}

.notice {
    display: grid;
    gap: 6px;
    padding: 16px 18px;
    border-radius: var(--radius-small);
    background: rgba(11, 19, 32, 0.6);
    border: 1px solid var(--color-line-strong);
    color: var(--color-mist);
    font-size: 0.92rem;
}

.notice--info {
    border-left: 3px solid var(--color-cyan);
}

.notice--error {
    margin-bottom: 18px;
    border-left: 3px solid #FF6B5B;
    color: #FFD5D0;
}

.form-card {
    padding: 36px;
    border-radius: var(--radius-medium);
    background: linear-gradient(160deg, rgba(27, 38, 56, 0.85), rgba(11, 19, 32, 0.92));
    border: 1px solid var(--color-line-strong);
    box-shadow: var(--shadow-deep);
}

.entry-form {
    display: grid;
    gap: 28px;
}

.form-section {
    display: grid;
    gap: 16px;
    padding: 0;
    border: 0;
}

.form-section legend {
    color: var(--color-cyan);
    font-family: 'Barlow Condensed', sans-serif;
    font-weight: 700;
    font-size: 1.05rem;
    text-transform: uppercase;
    letter-spacing: 0.16em;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--color-line);
    width: 100%;
    margin-bottom: 6px;
}

.form-section__hint {
    margin: -6px 0 4px;
    color: var(--color-fog);
    font-size: 0.92rem;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
}

.field {
    display: grid;
    gap: 8px;
}

.field--full {
    grid-column: 1 / -1;
}

.field label {
    color: var(--color-mist);
    font-weight: 600;
    font-size: 0.92rem;
    letter-spacing: 0.04em;
}

.field input,
.field select {
    width: 100%;
    min-height: 52px;
    padding: 0 16px;
    border: 1px solid var(--color-line-strong);
    border-radius: var(--radius-small);
    background: rgba(6, 10, 17, 0.6);
    color: var(--color-white);
    font: inherit;
    font-size: 0.98rem;
    transition: border-color 0.18s ease, box-shadow 0.18s ease, background-color 0.18s ease;
}

.field input::placeholder {
    color: var(--color-fog);
}

.field input:hover,
.field select:hover {
    border-color: rgba(109, 201, 224, 0.42);
}

.field input:focus,
.field select:focus {
    outline: none;
    border-color: var(--color-cyan);
    box-shadow: 0 0 0 3px rgba(109, 201, 224, 0.18);
    background: rgba(11, 19, 32, 0.8);
}

.field select {
    appearance: none;
    -webkit-appearance: none;
    background-image:
        linear-gradient(45deg, transparent 50%, var(--color-cyan) 50%),
        linear-gradient(-45deg, transparent 50%, var(--color-cyan) 50%);
    background-position:
        calc(100% - 22px) calc(50% - 2px),
        calc(100% - 16px) calc(50% - 2px);
    background-size: 6px 6px, 6px 6px;
    background-repeat: no-repeat;
    padding-right: 44px;
}

.checkbox-group {
    display: grid;
    gap: 12px;
}

.checkbox {
    display: grid;
    grid-template-columns: 22px 1fr;
    gap: 14px;
    align-items: start;
    padding: 12px 14px;
    border-radius: var(--radius-small);
    background: rgba(6, 10, 17, 0.32);
    border: 1px solid var(--color-line);
    transition: border-color 0.18s ease, background-color 0.18s ease;
    cursor: pointer;
    color: var(--color-mist);
    font-size: 0.95rem;
    line-height: 1.55;
}

.checkbox:hover {
    border-color: rgba(109, 201, 224, 0.36);
    background: rgba(11, 19, 32, 0.55);
}

.checkbox input {
    appearance: none;
    -webkit-appearance: none;
    width: 22px;
    height: 22px;
    margin: 1px 0 0;
    border: 1px solid var(--color-line-strong);
    border-radius: 4px;
    background: rgba(6, 10, 17, 0.7);
    cursor: pointer;
    display: inline-grid;
    place-items: center;
    transition: border-color 0.18s ease, background-color 0.18s ease;
}

.checkbox input::after {
    content: "";
    width: 12px;
    height: 12px;
    background: var(--color-cyan);
    border-radius: 2px;
    transform: scale(0);
    transition: transform 0.16s ease;
}

.checkbox input:checked {
    border-color: var(--color-cyan);
    background: rgba(109, 201, 224, 0.08);
}

.checkbox input:checked::after {
    transform: scale(1);
}

.checkbox input:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px rgba(109, 201, 224, 0.28);
}

.checkbox--optional {
    background: transparent;
    color: var(--color-fog);
}

.checkbox a {
    color: var(--color-cyan);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.field-error {
    margin: 4px 0 0;
    color: #FF6B5B;
    font-size: 0.88rem;
    font-weight: 600;
}

/* Page banner (rules page) */
.page-banner {
    padding: 88px 0 72px;
    background:
        radial-gradient(800px 360px at 80% 0%, rgba(109, 201, 224, 0.10), transparent 60%),
        linear-gradient(180deg, #0A1220 0%, #0B1320 100%);
    border-bottom: 1px solid var(--color-line);
}

.page-banner--simple {
    min-height: calc(100vh - 174px);
    display: grid;
    align-items: center;
    padding: 96px 0;
}

.page-banner__inner {
    display: grid;
    gap: 18px;
    max-width: 820px;
}

.page-banner__inner p {
    color: rgba(231, 239, 248, 0.82);
    font-size: 1.05rem;
}

/* Rules document */
.rules-document {
    padding: 44px;
    border-radius: var(--radius-medium);
    background: linear-gradient(160deg, rgba(27, 38, 56, 0.7), rgba(19, 28, 42, 0.7));
    border: 1px solid var(--color-line);
    box-shadow: var(--shadow-soft);
}

.rules-document__section {
    display: grid;
    gap: 14px;
}

.rules-document__section + .rules-document__section {
    margin-top: 32px;
    padding-top: 32px;
    border-top: 1px solid var(--color-line);
}

.rules-document__section h2 {
    margin: 0;
    font-size: clamp(1.4rem, 2vw, 1.75rem);
    color: var(--color-cyan);
}

.rules-document__section ul {
    display: grid;
    gap: 10px;
    padding-left: 22px;
}

.rules-document__section li {
    color: rgba(231, 239, 248, 0.82);
}

.rules-document__section li::marker {
    color: var(--color-cyan);
}

/* Footer — light surface so the black BDT logo is visible */
.site-footer {
    background: var(--color-light-bg);
    border-top: 1px solid var(--color-light-2);
    padding: 36px 0;
    color: #4A5568;
}

.site-footer__inner {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 32px;
    font-size: 0.86rem;
}

.site-footer__brand {
    display: grid;
    gap: 12px;
    color: var(--color-light-text);
}

.site-footer__brand img {
    height: 40px;
    width: auto;
    color: var(--color-light-text);
}

.site-footer__brands {
    margin: 0;
    color: #6B7280;
    font-size: 0.78rem;
    letter-spacing: 0.06em;
    max-width: 360px;
}

.site-footer__legal {
    display: grid;
    gap: 6px;
    text-align: right;
    color: #4A5568;
}

.site-footer__legal p {
    margin: 0;
}

.site-footer__credit {
    color: var(--color-light-text);
    font-weight: 600;
}

.site-footer__credit a {
    color: var(--color-light-text);
}

.site-footer__credit a:hover {
    color: var(--color-cyan-deep);
}

.site-footer__meta {
    color: #6B7280;
    font-size: 0.76rem;
    max-width: 420px;
    margin-left: auto;
}

/* Responsive */
@media (max-width: 1024px) {
    .prize-layout,
    .requirements-layout,
    .entry-layout {
        grid-template-columns: 1fr;
        gap: 36px;
    }
}

@media (max-width: 720px) {
    .site-header__inner {
        flex-direction: column;
        align-items: flex-start;
        gap: 14px;
        padding: 14px 0;
    }

    .site-nav {
        gap: 18px;
        flex-wrap: wrap;
    }

    .site-nav a {
        font-size: 0.84rem;
    }

    .site-nav a::after {
        bottom: -4px;
    }

    .hero {
        min-height: auto;
    }

    .hero__inner,
    .section {
        padding-top: 64px;
        padding-bottom: 64px;
    }

    .download-card,
    .teaser-card {
        grid-template-columns: 1fr;
        padding: 28px;
    }

    .rules-document {
        padding: 28px;
    }

    .requirements-card,
    .form-card {
        padding: 24px;
    }

    .form-grid {
        grid-template-columns: 1fr;
    }

    .site-footer__inner {
        flex-direction: column;
    }

    .site-footer__legal {
        text-align: left;
    }

    .site-footer__meta {
        margin-left: 0;
    }
}