:root {
    --bg: #f5f5f7;
    --surface: rgba(255, 255, 255, 0.72);
    --surface-strong: rgba(255, 255, 255, 0.88);
    --stroke: rgba(0, 0, 0, 0.08);
    --stroke-strong: rgba(0, 0, 0, 0.12);
    --text: #0b0b0f;
    --muted: rgba(11, 11, 15, 0.62);
    --shadow: 0 18px 60px rgba(0, 0, 0, 0.12);
    --shadow-soft: 0 10px 40px rgba(0, 0, 0, 0.08);
    --radius: 22px;
    --radius-sm: 16px;
    --accent: #007aff;
    --accent-2: #5856d6;
    --focus: rgba(0, 122, 255, 0.28);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Segoe UI', Roboto, Arial, sans-serif;
    line-height: 1.5;
    color: var(--text);
    background: var(--bg);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    position: relative;
    isolation: isolate;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    z-index: -1;
    background-image: url('assets/background.png?v=20260304-1');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    filter: blur(6px) saturate(1.08);
    opacity: 0.78;
    transform: scale(1.04);
    pointer-events: none;
}

main {
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    max-width: 100%;
    height: auto;
}

.container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: linear-gradient(135deg, rgba(88, 86, 214, 0.92), rgba(0, 122, 255, 0.70));
    backdrop-filter: blur(12px) saturate(140%);
    -webkit-backdrop-filter: blur(12px) saturate(140%);
    border-bottom: 1px solid rgba(255, 255, 255, 0.16);
    color: rgba(255, 255, 255, 0.92);
}

header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 4px;
    padding-bottom: 4px;
}

header .cta-button {
    padding: 9px 12px;
    border-radius: 12px;
    box-shadow: 0 10px 24px rgba(0,0,0,0.18);
    background: rgba(255, 255, 255, 0.16);
    border-color: rgba(255, 255, 255, 0.22);
    color: rgba(255, 255, 255, 0.96);
}

.logo {
    width: 112px;
    height: 112px;
    object-fit: contain;
}

/* Hero */
.hero {
    position: relative;
    padding: 28px 0 56px;
    min-height: auto;
    display: flex;
    align-items: center;
}

.hero::before {
    content: none;
}

.hero-content {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
    width: 100%;
}

.hero-text {
    background: transparent;
    border: none;
    border-radius: var(--radius);
    padding: 0;
    box-shadow: none;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    display: flex;
    flex-direction: column;
    gap: 16px;
    justify-content: center;
    align-items: center;
    padding-top: 0;
}

.hero-speaker-card,
.hero-teaser-card {
    width: 100%;
    max-width: 500px;
    background: var(--surface);
    border: 1px solid var(--stroke);
    border-radius: var(--radius);
    padding: 24px 26px;
    box-shadow: var(--shadow-soft);
    backdrop-filter: blur(14px) saturate(140%);
    -webkit-backdrop-filter: blur(14px) saturate(140%);
}

.hero-eyebrow,
.hero-teaser-label {
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--muted);
    margin: 0 0 8px;
}

.hero-speaker-name {
    font-size: 32px;
    line-height: 1.1;
    letter-spacing: -0.03em;
    font-weight: 800;
    margin: 0 0 10px;
}

.hero-speaker-bio,
.hero-teaser-sub {
    font-size: 16px;
    line-height: 1.55;
    color: rgba(11, 11, 15, 0.78);
    margin: 0;
}

.hero-teaser-title {
    font-size: 22px;
    line-height: 1.25;
    letter-spacing: -0.02em;
    font-weight: 800;
    margin: 0 0 8px;
}

.hero-top-title {
    width: 100%;
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
}

.hero-top-title img {
    width: 100%;
    max-width: 540px;
    height: auto;
    display: block;
    object-fit: contain;
    filter: drop-shadow(0 12px 28px rgba(0,0,0,0.12));
}

.hero-speaker-text-art {
    width: 100%;
    max-width: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-speaker-text-art img {
    width: 100%;
    height: auto;
    display: block;
    object-fit: contain;
}

.hero h1 {
    font-size: 54px;
    line-height: 1.05;
    letter-spacing: -0.03em;
    font-weight: 800;
    margin-bottom: 14px;
}

.subtitle {
    font-size: 18px;
    color: var(--muted);
    margin-bottom: 18px;
}

.hero-text > .cta-button {
    width: min(360px, 100%);
    min-height: 58px;
    border-radius: 16px;
    font-size: 18px;
    padding-left: 22px;
    padding-right: 22px;
    align-self: flex-start;
}

.hero-image {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 16px;
    position: relative;
    padding-right: 0;
}

.hero-image img:not(.hero-speaker-art) {
    width: 100%;
    max-width: 540px;
    height: auto;
    display: block;
    object-fit: cover;
    aspect-ratio: 2 / 3;
    border-radius: calc(var(--radius) + 4px);
    box-shadow: 0 36px 70px rgba(0,0,0,0.28);
}

.hero-speaker-art {
    width: 100%;
    max-width: 420px;
    height: auto;
    display: block;
    object-fit: contain;
    filter: drop-shadow(0 16px 40px rgba(0,0,0,0.18));
    margin-top: 0;
}

/* Buttons */
.cta-button {
    appearance: none;
    border: 1px solid rgba(0, 0, 0, 0.06);
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: #fff;
    padding: 14px 18px;
    border-radius: 14px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease;
    box-shadow: 0 14px 34px rgba(0,0,0,0.18);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    -webkit-tap-highlight-color: transparent;
}

.cta-button:hover {
    transform: translateY(-1px);
    border-color: rgba(0, 0, 0, 0.10);
    box-shadow: 0 18px 46px rgba(0,0,0,0.22);
}

.cta-button:active {
    transform: translateY(0);
}

.cta-button:focus {
    outline: none;
}

.cta-button:focus-visible {
    box-shadow: 0 18px 46px rgba(0,0,0,0.22), 0 0 0 6px var(--focus);
}

/* Registration Form */
.registration-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
    max-width: 400px;
    margin: 0 auto;
    width: 100%;
}

.registration-form input[type="tel"] {
    appearance: none;
    border: 1px solid var(--stroke-strong);
    background: var(--surface-strong);
    backdrop-filter: blur(10px);
    color: var(--text);
    padding: 16px 20px;
    border-radius: 14px;
    font-size: 16px;
    font-family: inherit;
    transition: border-color 160ms ease, box-shadow 160ms ease;
    outline: none;
}

.registration-form input[type="tel"]:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px var(--focus);
}

.registration-form input[type="tel"]::placeholder {
    color: var(--muted);
}

.registration-form .cta-button {
    width: 100%;
}

/* Program */
.program {
    padding: 40px 0 50px;
}

.program h2 {
    font-size: 36px;
    letter-spacing: -0.02em;
    font-weight: 800;
    margin-bottom: 24px;
}

.section-title-spaced {
    margin-top: 60px;
}

/* Speaker Info */
.speaker-info {
    background: var(--surface);
    border: 1px solid var(--stroke);
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: 0 10px 28px rgba(0,0,0,0.08);
    backdrop-filter: blur(16px) saturate(140%);
    -webkit-backdrop-filter: blur(16px) saturate(140%);
    margin-bottom: 40px;
}

.speaker-info p {
    font-size: 16px;
    line-height: 1.65;
    margin-bottom: 16px;
    color: var(--text);
}

.speaker-info ul {
    margin: 12px 0 20px 20px;
    padding: 0;
}

.speaker-info ul li {
    font-size: 15px;
    line-height: 1.6;
    margin-bottom: 8px;
    color: var(--muted);
}

/* Q&A Topics */
.qa-topics {
    background: linear-gradient(135deg, rgba(88, 86, 214, 0.06), rgba(0, 122, 255, 0.06)), var(--surface);
    border: 1px solid var(--stroke);
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: 0 10px 28px rgba(0,0,0,0.08);
    backdrop-filter: blur(16px) saturate(140%);
    -webkit-backdrop-filter: blur(16px) saturate(140%);
}

.qa-intro {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text);
}

.qa-list {
    list-style: none;
    padding: 0;
    margin: 0 0 24px 0;
}

.qa-list li {
    font-size: 16px;
    line-height: 1.6;
    margin-bottom: 12px;
    padding-left: 8px;
    color: var(--text);
}

.qa-note {
    font-size: 17px;
    font-weight: 600;
    margin-top: 24px;
    margin-bottom: 0;
    padding-top: 24px;
    border-top: 1px solid var(--stroke);
    color: var(--text);
}

/* CTA section */
.cta-section {
    padding: 50px 0 60px;
}

.cta-content {
    background: linear-gradient(135deg, rgba(88, 86, 214, 0.10), rgba(0, 122, 255, 0.10)), var(--surface-strong);
    border: 1px solid var(--stroke-strong);
    border-radius: calc(var(--radius) + 6px);
    padding: 34px;
    box-shadow: var(--shadow), inset 0 0 0 1px rgba(255, 255, 255, 0.35);
    text-align: center;
    backdrop-filter: blur(18px) saturate(140%);
    -webkit-backdrop-filter: blur(18px) saturate(140%);
    color: var(--text);
    max-width: 920px;
    margin: 0 auto;
}

.cta-content h2 {
    font-size: 34px;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 10px;
}

.cta-content p {
    color: rgba(11, 11, 15, 0.78);
    font-size: 16px;
    margin-bottom: 18px;
}


/* Footer */
footer {
    padding: 28px 0 46px;
    border-top: 1px solid rgba(0, 0, 0, 0.06);
    color: rgba(11, 11, 15, 0.55);
    text-align: center;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
        scroll-behavior: auto !important;
    }
}

/* Responsive */
@media (max-width: 980px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .hero-text {
        padding-top: 0;
    }

    .hero-top-title {
        margin-bottom: 16px;
    }

    .hero h1 {
        font-size: 44px;
    }

}

@media (max-width: 560px) {
    .hero {
        padding: 40px 0 60px;
        min-height: auto;
    }

    .hero-content {
        gap: 40px;
    }

    .hero-text {
        padding: 0;
        gap: 14px;
    }

    .hero-speaker-name {
        font-size: 26px;
    }

    .hero-teaser-title {
        font-size: 18px;
    }

    .logo {
        width: 84px;
        height: 84px;
    }

    header .cta-button {
        padding: 7px 10px;
        font-size: 13px;
        border-radius: 10px;
    }

    header .container {
        padding-top: 8px;
        padding-bottom: 8px;
    }

    .hero-text > .cta-button {
        width: 100%;
        min-height: 56px;
        font-size: 16px;
        border-radius: 14px;
    }

    .hero-image {
        gap: 12px;
        padding-right: 0;
    }

    .hero-speaker-art {
        margin-top: 0;
    }

    .hero-top-title img {
        max-width: 100%;
    }

    .hero h1 {
        font-size: 34px;
    }

    .program h2 {
        font-size: 28px;
    }

    .cta-content {
        padding: 22px;
    }

    .cta-content h2 {
        font-size: 26px;
    }
}