:root {
    --primary-color: #10a37f;
    --primary-hover: #0d8f70;
    --primary-soft: rgba(16, 163, 127, 0.10);
    --primary-softer: rgba(16, 163, 127, 0.06);
    --secondary-color: #0d7a60;

    --text-color: #202123;
    --heading-color: #111827;
    --light-text: #6b7280;
    --muted-text: #8a8f98;

    --background-color: #ffffff;
    --light-background: #f7fbfa;
    --surface-color: #ffffff;
    --surface-muted: #f3f7f5;

    --border-color: #ddebe7;
    --border-strong: #c8ded7;

    --success-color: #10a37f;
    --warning-color: #f4b400;
    --danger-color: #d93025;

    --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.04);
    --shadow-sm: 0 4px 12px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 10px 30px rgba(15, 23, 42, 0.08);
    --shadow-lg: 0 20px 50px rgba(15, 23, 42, 0.12);

    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 22px;
    --radius-pill: 999px;

    --container-width: 1180px;
    --header-height: 78px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: "Roboto", sans-serif;
    line-height: 1.7;
    color: var(--text-color);
    background: var(--background-color);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

body,
button,
input,
textarea {
    font-family: "Roboto", sans-serif;
}

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

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s ease, opacity 0.2s ease;
}

a:hover {
    color: var(--primary-hover);
}

.container {
    width: min(var(--container-width), calc(100% - 40px));
    margin: 0 auto;
}

section {
    position: relative;
    padding: 96px 0;
    scroll-margin-top: calc(var(--header-height) + 24px);
}

section:nth-of-type(even):not(.hero) {
    background: var(--light-background);
}

section h2 {
    margin-bottom: 18px;
    color: var(--heading-color);
    text-align: center;
    font-size: clamp(2rem, 4vw, 3rem);
    line-height: 1.15;
    letter-spacing: -0.035em;
    font-weight: 700;
}

section h2::after {
    content: "";
    display: block;
    width: 56px;
    height: 4px;
    margin: 18px auto 0;
    border-radius: var(--radius-pill);
    background: linear-gradient(90deg, var(--primary-color), #62d5b7);
}

section:not(.hero) > .container > p,
section:not(.hero) > p {
    max-width: 780px;
    margin: 0 auto 42px;
    text-align: center;
    color: var(--light-text);
    font-size: 1.05rem;
}

/* ---------- Header ---------- */
.fixed-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    min-height: var(--header-height);
    background: rgba(255, 255, 255, 0.88);
    border-bottom: 1px solid rgba(221, 235, 231, 0.85);
    box-shadow: 0 6px 24px rgba(15, 23, 42, 0.04);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    z-index: 1000;
}

.fixed-header .container {
    min-height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-image {
    width: 44px;
    height: 44px;
    object-fit: cover;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
}

.logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1.15;
}

.logo h1 {
    margin: 0;
    color: var(--heading-color);
    font-size: 1.15rem;
    letter-spacing: -0.025em;
}

.logo p {
    margin-top: 4px;
    color: var(--light-text);
    font-size: 0.75rem;
}

nav ul {
    display: flex;
    align-items: center;
    gap: 8px;
    list-style: none;
}

nav ul li {
    margin: 0;
}

nav ul li a {
    display: inline-flex;
    align-items: center;
    padding: 10px 12px;
    color: #3f444c;
    border-radius: 10px;
    font-size: 0.88rem;
    font-weight: 500;
    transition: color 0.2s ease, background-color 0.2s ease;
}

nav ul li a:hover,
nav ul li a.active {
    color: var(--primary-color);
    background: var(--primary-softer);
}

nav ul li a.active::after {
    display: none;
}

.hamburger {
    display: none;
    width: 42px;
    height: 42px;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 5px;
    border-radius: 10px;
    cursor: pointer;
    background: var(--surface-muted);
}

.hamburger span {
    width: 22px;
    height: 2px;
    margin: 0;
    background: var(--text-color);
    border-radius: var(--radius-pill);
}

/* ---------- Hero ---------- */
.hero {
    min-height: 760px;
    padding: calc(var(--header-height) + 110px) 0 120px;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: #063f34;
}

#hero-background {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: 1;
    background:
        radial-gradient(circle at 20% 15%, rgba(118, 230, 197, 0.18), transparent 34%),
        radial-gradient(circle at 80% 20%, rgba(16, 163, 127, 0.16), transparent 32%),
        linear-gradient(180deg, rgba(1, 24, 20, 0.08), rgba(1, 24, 20, 0.35));
    pointer-events: none;
}

.hero .container {
    position: relative;
    z-index: 2;
    max-width: 980px;
    text-align: center;
}

.hero-logo {
    margin: 0 auto 28px;
}

.hero-logo-image {
    width: 180px;
    height: 180px;
    margin: 0 auto;
    object-fit: cover;
    mix-blend-mode: screen;
    filter: drop-shadow(0 0 15px rgba(255, 255, 255, 0.6));
    border-radius: 28px;
    transition: transform 0.3s ease, filter 0.3s ease;
}

.hero-logo-image:hover {
    transform: scale(1.05);
    filter: drop-shadow(0 0 20px rgba(255, 255, 255, 0.8));
}

.hero h2 {
    color: white;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.4);
    font-size: 42px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
    letter-spacing: normal;
}

.hero h2::after {
    display: none;
}

.centered-subtitle,
.hero p {
    color: rgba(255, 255, 255, 0.9);
    text-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
    font-size: 22px;
    font-weight: 400;
    line-height: 1.6;
    margin-bottom: 40px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    letter-spacing: normal;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 14px;
    flex-wrap: wrap;
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    min-height: 48px;
    align-items: center;
    justify-content: center;
    padding: 12px 22px;
    border: 1px solid transparent;
    border-radius: 12px;
    font-weight: 600;
    line-height: 1;
    cursor: pointer;
    transition:
        transform 0.2s ease,
        box-shadow 0.2s ease,
        background-color 0.2s ease,
        border-color 0.2s ease;
}

.btn:hover {
    transform: translateY(-2px);
}

.primary {
    color: #ffffff;
    background: var(--primary-color);
    box-shadow: 0 10px 24px rgba(16, 163, 127, 0.24);
}

.primary:hover {
    color: #ffffff;
    background: var(--primary-hover);
    box-shadow: 0 14px 30px rgba(16, 163, 127, 0.30);
}

.secondary {
    color: var(--primary-color);
    background: #ffffff;
    border-color: var(--border-color);
}

.secondary:hover {
    background: var(--light-background);
    border-color: var(--border-strong);
}

.hero .btn.primary {
    color: #0b5f4d;
    background: #ffffff;
    border-color: rgba(255, 255, 255, 0.95);
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.18);
}

.hero .btn.primary:hover {
    background: #f7fffc;
}

.hero .btn.secondary {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.58);
    backdrop-filter: blur(10px);
}

.hero .btn.secondary:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.8);
}

.center-btn {
    margin-top: 34px;
    text-align: center;
}

.previous-edition-link{
    padding:8px 14px !important;
    border-radius:999px;
    background:var(--primary-soft);
    border:1px solid rgba(16,163,127,.18);
    color:var(--primary-color) !important;
    font-weight:600;
}

.previous-edition-link:hover{
    background:var(--primary-color);
    color:white !important;
}
/* ---------- Overview ---------- */
.overview-content {
    display: block;
    margin-top: 42px;
}

.overview-text {
    max-width: 900px;
    margin: 0 auto;
    padding: 36px 40px;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.overview-text p {
    margin-bottom: 18px;
    color: #40444b;
    font-size: 1.02rem;
}

.overview-text p:last-child {
    margin-bottom: 0;
}

/* ---------- Workshop Overview Cards ---------- */

.overview-intro {
    max-width: 820px;
    margin: 0 auto 48px;
    color: var(--light-text);
    text-align: center;
    font-size: 1.08rem;
    line-height: 1.75;
}

.overview-cards {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
    max-width: 1120px;
    margin: 0 auto;
}

.overview-card {
    position: relative;
    display: flex;
    flex-direction: column;
    min-height: 100%;
    padding: 32px 28px 28px;
    overflow: hidden;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition:
        transform 0.25s ease,
        box-shadow 0.25s ease,
        border-color 0.25s ease;
}

.overview-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(
        90deg,
        var(--primary-color),
        #69d7b9
    );
}

.overview-card:hover {
    transform: translateY(-7px);
    border-color: var(--border-strong);
    box-shadow: var(--shadow-lg);
}

.overview-icon {
    width: 58px;
    height: 58px;
    margin-bottom: 22px;
    display: grid;
    place-items: center;
    color: var(--primary-color);
    background: var(--primary-soft);
    border-radius: 18px;
    font-size: 1.4rem;
    transition:
        transform 0.25s ease,
        background-color 0.25s ease;
}

.overview-card:hover .overview-icon {
    transform: scale(1.06);
    background: rgba(16, 163, 127, 0.15);
}

.overview-card h3 {
    margin-bottom: 14px;
    color: var(--heading-color);
    font-size: 1.28rem;
    line-height: 1.3;
    letter-spacing: -0.02em;
}

.overview-card > p {
    flex-grow: 1;
    margin-bottom: 24px;
    color: var(--light-text);
    font-size: 0.98rem;
    line-height: 1.7;
}

.overview-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: auto;
}

.overview-tags span {
    display: inline-flex;
    align-items: center;
    min-height: 30px;
    padding: 6px 10px;
    color: var(--secondary-color);
    background: var(--primary-softer);
    border: 1px solid rgba(16, 163, 127, 0.14);
    border-radius: var(--radius-pill);
    font-size: 0.78rem;
    font-weight: 500;
    line-height: 1;
}

/* Tablet */
@media (max-width: 900px) {
    .overview-cards {
        grid-template-columns: 1fr;
        max-width: 720px;
    }

    .overview-card {
        padding: 28px;
    }
}

/* Mobile */
@media (max-width: 640px) {
    .overview-intro {
        margin-bottom: 34px;
        font-size: 1rem;
        text-align: left;
    }

    .overview-card {
        padding: 26px 22px 24px;
        border-radius: 18px;
    }

    .overview-icon {
        width: 52px;
        height: 52px;
        border-radius: 16px;
    }

    .overview-card h3 {
        font-size: 1.18rem;
    }
}

/* ---------- Call for Papers ---------- */
.call-section .paper-info {
    max-width: 960px;
    margin: 42px auto 0;
    padding: 38px 42px;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.paper-info h3,
.topics h3 {
    margin-bottom: 8px;
    color: var(--heading-color);
    font-size: 1.35rem;
    letter-spacing: -0.02em;
}

.paper-info p {
    color: #43474f;
}

.paper-info ul,
.topics ul,
.submission-box ul {
    list-style: none;
    padding: 0;
    margin: 18px 0 28px;
}

.paper-info ul li,
.topics ul li,
.submission-box ul li {
    position: relative;
    margin-bottom: 13px;
    padding-left: 28px;
    color: #3f444c;
    line-height: 1.65;
}

.paper-info ul li::before,
.topics ul li::before,
.submission-box ul li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.72em;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), #5ed2b2);
    box-shadow: 0 0 0 4px var(--primary-soft);
}

.submission-box {
    margin: 28px 0;
    padding: 24px 26px;
    background: var(--light-background);
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--primary-color);
    border-radius: var(--radius-md);
}

.submission-box h4 {
    margin-bottom: 12px;
    color: var(--primary-color);
    font-size: 1.1rem;
}

/* =========================================================
   Call for Papers — Two-column layout
   ========================================================= */

.call-section {
    padding: 96px 0;
}

.cfp-layout {
    width: 100%;
    max-width: 1200px;
    margin: 48px auto 0;
    display: grid;
    grid-template-columns: 45% 55%;
    gap: 32px;
    align-items: start;
}

/* Left side */

.cfp-left {
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.cfp-box {
    padding: 32px;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.cfp-box h3,
.cfp-right h3 {
    margin: 0 0 20px;
    color: var(--heading-color);
    font-size: 1.35rem;
    line-height: 1.3;
    letter-spacing: -0.02em;
}

.cfp-box p {
    margin: 0 0 16px;
    color: #43474f;
    font-size: 0.98rem;
    line-height: 1.75;
    text-align: left;
}

.cfp-box p:last-child {
    margin-bottom: 0;
}

/* Submission guidelines */

.cfp-guidelines {
    margin: 0;
    padding: 0;
    list-style: none;
}

.cfp-guidelines li {
    position: relative;
    margin: 0 0 18px;
    padding: 0 0 0 26px;
    color: #43474f;
    font-size: 0.96rem;
    line-height: 1.7;
}

.cfp-guidelines li:last-child {
    margin-bottom: 0;
}

.cfp-guidelines li::before {
    content: "";
    position: absolute;
    top: 0.7em;
    left: 0;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--primary-color);
    box-shadow: 0 0 0 4px var(--primary-soft);
}

.cfp-guidelines strong {
    color: var(--heading-color);
}

/* Right topics panel */

.cfp-right {
    min-width: 0;
    padding: 30px;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.cfp-topics {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* Horizontal topic boxes */

.cfp-topic {
    width: 100%;
    min-height: 58px;
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 16px;
    color: #31544b;
    background: var(--light-background);
    border: 1px solid var(--border-color);
    border-radius: 13px;
    font-size: 0.91rem;
    font-weight: 500;
    line-height: 1.4;
    transition:
        transform 0.2s ease,
        border-color 0.2s ease,
        background-color 0.2s ease,
        box-shadow 0.2s ease;
}

.cfp-topic i {
    width: 34px;
    height: 34px;
    flex: 0 0 34px;
    display: grid;
    place-items: center;
    color: var(--primary-color);
    background: var(--primary-soft);
    border-radius: 10px;
    font-size: 0.95rem;
}

.cfp-topic:hover {
    transform: translateX(4px);
    background: #ffffff;
    border-color: var(--border-strong);
    box-shadow: var(--shadow-sm);
}

/* Tablet and mobile */

@media (max-width: 900px) {
    .cfp-layout {
        grid-template-columns: 1fr;
        max-width: 760px;
    }

    .cfp-right {
        order: 2;
    }
}

@media (max-width: 640px) {
    .cfp-layout {
        margin-top: 34px;
        gap: 20px;
    }

    .cfp-box,
    .cfp-right {
        padding: 24px 20px;
        border-radius: 18px;
    }

    .cfp-topic {
        min-height: 54px;
        padding: 12px 14px;
    }
}
/* ---------- Important Dates ---------- */
.dates-container {
    max-width: 1100px;
    margin: 44px auto 0;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 22px;
}

.date-item {
    position: relative;
    min-width: 0;
    padding: 28px 22px;
    text-align: center;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.date-item::before {
    content: "";
    position: absolute;
    inset: 0 0 auto 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), #70dabb);
}

.date-item:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.date-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 18px;
    display: grid;
    place-items: center;
    border-radius: 18px;
    background: var(--primary-soft);
    color: var(--primary-color);
}

.date-icon i {
    color: var(--primary-color);
    font-size: 1.45rem;
}

.date-info h3 {
    margin-bottom: 8px;
    color: var(--heading-color);
    font-size: 1rem;
}

.date-info p {
    color: var(--primary-color);
    font-size: 1rem;
    font-weight: 700;
}

/* ---------- Speakers / Organizers ---------- */
.speakers-grid,
.organizers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
    margin-top: 42px;
}

.speaker-card,
.organizer-card {
    overflow: hidden;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.speaker-card:hover,
.organizer-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.speaker-card a,
.organizer-card a {
    display: block;
    color: inherit;
}

.speaker-card a:hover,
.organizer-card a:hover {
    transform: none;
}

.speaker-card img,
.organizer-card img {
    width: 100%;
    aspect-ratio: 1 / 1;
    object-fit: cover;
    background: var(--surface-muted);
}

.speaker-card h3,
.organizer-card h3 {
    margin: 18px 18px 6px;
    color: var(--heading-color);
    font-size: 1.05rem;
    letter-spacing: -0.015em;
}

.speaker-card p,
.organizer-card .affiliation,
.organizer-card .role {
    padding: 0 18px 20px;
    color: var(--light-text);
    font-size: 0.9rem;
    line-height: 1.5;
}

.organizer-card .role {
    color: var(--primary-color);
    font-weight: 600;
}

.speaker-status,
.speaker-links,
.organizer-links,
.speaker-card .bio,
.organizer-card .bio {
    display: none;
}

/* ---------- Schedule ---------- */
.schedule-section {
    background: var(--light-background);
}

.schedule-note {
    max-width: 920px;
    margin: 28px auto;
    padding: 18px 20px;
    background: var(--primary-soft);
    border: 1px solid rgba(16, 163, 127, 0.18);
    border-left: 4px solid var(--primary-color);
    border-radius: var(--radius-md);
    color: #31544b;
}

.timeline {
    position: relative;
    max-width: 960px;
    margin: 46px auto 0;
}

.timeline::before {
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    left: 52px;
    width: 2px;
    background: linear-gradient(var(--primary-color), rgba(16, 163, 127, 0.18));
}

.timeline-item {
    position: relative;
    display: flex;
    margin-bottom: 18px;
    overflow: hidden;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.timeline-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.time {
    min-width: 112px;
    padding: 18px 12px;
    display: grid;
    place-items: center;
    color: #ffffff;
    background: linear-gradient(180deg, var(--primary-color), var(--secondary-color));
    font-size: 0.86rem;
    font-weight: 700;
    text-align: center;
}

.event {
    flex: 1;
    padding: 18px 22px;
}

.event h3 {
    margin-bottom: 6px;
    color: var(--heading-color);
    font-size: 1rem;
}

.event p {
    margin-bottom: 5px;
    color: var(--light-text);
    font-size: 0.9rem;
}

.talk-title {
    color: var(--primary-color) !important;
    font-weight: 500;
}

.event-with-photo {
    display: flex;
    align-items: center;
    gap: 16px;
}

.speaker-thumbnail {
    width: 54px;
    height: 54px;
    object-fit: cover;
    border: 3px solid rgba(16, 163, 127, 0.22);
    border-radius: 50%;
}

/* ---------- Papers ---------- */
.papers-section {
    background: var(--light-background);
}

.papers-list {
    margin-top: 42px;
}

.paper-item {
    margin-bottom: 18px;
    padding: 24px;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: transform 0.22s ease, box-shadow 0.22s ease;
}

.paper-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.paper-title {
    margin-bottom: 10px;
    color: var(--heading-color);
    font-size: 1.08rem;
    font-weight: 700;
    line-height: 1.4;
}

.paper-authors,
.paper-info {
    color: var(--light-text);
}

.paper-links {
    margin-top: 14px;
}

.paper-links a {
    display: inline-flex;
    margin-right: 14px;
    color: var(--primary-color);
    font-weight: 600;
}

.papers-section .papers-list.compact {
    max-width: 1100px;
    margin: 42px auto 0;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
}

/* ---------- Contact ---------- */
.contact-info {
    max-width: 1280px;
    margin: 42px auto 0;
}

.contact-methods {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 22px;
}

.contact-method {
    display: block;
    min-height: 100%;
    padding: 28px;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.contact-method .icon {
    width: 52px;
    height: 52px;
    margin: 0 0 18px;
    display: grid;
    place-items: center;
    border-radius: 16px;
    background: var(--primary-soft);
    color: var(--primary-color);
    font-size: 1.2rem;
}

.contact-method h3 {
    margin-bottom: 10px;
    color: var(--heading-color);
}

.contact-method p {
    color: var(--light-text);
    line-height: 1.6;
}

/* ---------- FAQ ---------- */
.faq {
    max-width: 980px;
    margin: 64px auto 0;
}

.faq h3 {
    margin-bottom: 22px;
    color: var(--heading-color);
    font-size: 1.5rem;
    text-align: center;
}

.accordion-item {
    margin-bottom: 14px;
    overflow: hidden;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xs);
}

.accordion-header {
    padding: 18px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    cursor: pointer;
    background: #ffffff;
}

.accordion-header h4 {
    color: var(--heading-color);
    font-size: 1rem;
    font-weight: 600;
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    padding: 0 20px;
    color: var(--light-text);
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.accordion-item.active .accordion-content {
    max-height: 500px;
    padding: 0 20px 20px;
}

.toggle i {
    color: var(--primary-color);
    transition: transform 0.25s ease;
}

.accordion-item.active .toggle i {
    transform: rotate(45deg);
}

/* ---------- Sponsor ---------- */
.sponsors-wrapper {
    max-width: 1040px;
    margin: 42px auto 0;
}

.sponsor-card {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 28px;
    padding: 30px 34px;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.sponsor-logo {
    flex: 0 0 auto;
    max-width: 280px;
    text-align: center;
}

.sponsor-logo img {
    width: auto;
    max-height: 140px;
    object-fit: contain;
}

.sponsor-text {
    flex: 1;
    min-width: 220px;
}

.sponsor-label {
    margin-bottom: 6px;
    color: var(--muted-text);
    font-size: 0.72rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.sponsor-name {
    margin-bottom: 8px;
    color: var(--heading-color);
    font-size: 1.25rem;
    font-weight: 700;
}

.sponsor-description {
    color: var(--light-text);
}

/* ---------- Footer ---------- */
footer {
    padding: 64px 0 24px;
    color: rgba(255, 255, 255, 0.82);
    background:
        radial-gradient(circle at 20% 0%, rgba(16, 163, 127, 0.20), transparent 32%),
        #10211d;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr 1fr;
    gap: 48px;
    margin-bottom: 42px;
}

.footer-logo h3 {
    margin-bottom: 8px;
    color: #ffffff;
    font-size: 1.2rem;
}

.footer-logo p,
.footer-contact p {
    color: rgba(255, 255, 255, 0.66);
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a,
.footer-contact a {
    color: rgba(255, 255, 255, 0.74);
}

.footer-links a:hover,
.footer-contact a:hover {
    color: #ffffff;
}

.copyright {
    padding-top: 22px;
    border-top: 1px solid rgba(255, 255, 255, 0.10);
    text-align: center;
    color: rgba(255, 255, 255, 0.48);
    font-size: 0.85rem;
}

/* ---------- Deadline Notice ---------- */
.deadline-notice {
    position: fixed;
    inset: 0 0 auto 0;
    z-index: 2000;
    padding: 12px 20px;
    color: #19352d;
    background: #dff8ef;
    border-bottom: 1px solid #b9eadb;
    box-shadow: var(--shadow-sm);
    text-align: center;
}

.deadline-notice p {
    margin: 0;
    font-weight: 600;
}

.deadline-notice strong {
    color: var(--danger-color);
}

del {
    color: var(--muted-text);
}

/* ---------- Responsive ---------- */
@media (max-width: 1100px) {
    nav ul {
        gap: 2px;
    }

    nav ul li a {
        padding: 9px 8px;
        font-size: 0.82rem;
    }

    .dates-container {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .contact-methods {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 900px) {
    :root {
        --header-height: 70px;
    }

    .hamburger {
        display: flex;
    }

    nav ul {
        display: none;
        position: absolute;
        top: calc(100% + 1px);
        left: 20px;
        right: 20px;
        padding: 14px;
        flex-direction: column;
        align-items: stretch;
        gap: 4px;
        background: rgba(255, 255, 255, 0.98);
        border: 1px solid var(--border-color);
        border-radius: 0 0 16px 16px;
        box-shadow: var(--shadow-lg);
        backdrop-filter: blur(18px);
    }

    nav ul.active {
        display: flex;
    }

    nav ul li a {
        width: 100%;
        padding: 12px 14px;
        font-size: 0.95rem;
    }

    .hero {
        min-height: 680px;
        padding-top: calc(var(--header-height) + 84px);
    }

    .hero h2 {
        font-size: 36px;
    }

    .centered-subtitle,
    .hero p {
        font-size: 18px;
    }

    .hero-logo-image {
        width: 150px;
        height: 150px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .papers-section .papers-list.compact {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .container {
        width: min(100% - 28px, var(--container-width));
    }

    section {
        padding: 76px 0;
    }

    .fixed-header .container {
        min-height: 68px;
    }

    .logo-image {
        width: 38px;
        height: 38px;
        border-radius: 10px;
    }

    .logo p {
        display: none;
    }

    .hero {
        min-height: 640px;
        padding-bottom: 86px;
    }

    .hero h2 {
        font-size: 32px;
    }

    .centered-subtitle,
    .hero p {
        font-size: 17px;
    }

    .hero-logo-image {
        width: 124px;
        height: 124px;
        border-radius: 24px;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: stretch;
    }

    .btn {
        width: 100%;
    }

    .overview-text,
    .call-section .paper-info {
        padding: 28px 22px;
        border-radius: 18px;
    }

    .dates-container {
        grid-template-columns: 1fr;
    }

    .speakers-grid,
    .organizers-grid {
        grid-template-columns: 1fr;
    }

    .timeline::before {
        display: none;
    }

    .timeline-item {
        flex-direction: column;
    }

    .time {
        min-width: 100%;
        padding: 12px 16px;
    }

    .event-with-photo {
        align-items: flex-start;
    }

    .contact-method {
        padding: 24px 22px;
    }

    .sponsor-card {
        flex-direction: column;
        text-align: center;
        padding: 28px 22px;
    }
}