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

body {
    font-family: 'Lato', Verdana, Helvetica, sans-serif;
    color: #1e293b;
    background: #f8fafc;
    line-height: 1.75;
    font-size: 17px
}

a {
    color: #0284c7;
    text-decoration: none;
    transition: 0.2s
}

a:hover {
    text-decoration: underline
}

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

/* ===== Layout ===== */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 32px
}

/* ===== Hero ===== */
.hero {
    text-align: center;
    padding: 48px 0 40px;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    border-bottom: 1px solid #bae6fd
}

/* Logo bar */
.logo-bar {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 40px;
    margin-bottom: 32px;
    flex-wrap: wrap
}

.logo-bar img {
    height: 45px;
    object-fit: contain
}

/* Title */
.hero h1 {
    font-size: 32px;
    font-weight: 700;
    line-height: 1.35;
    max-width: 100%;
    margin: 0 auto 24px;
    color: #0c4a6e
}

.hero h1 em {
    font-style: italic;
    color: #0284c7
}

/* Authors — uniform black style, larger */
.author-block {
    margin-bottom: 12px
}

.author-row {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px 28px;
    margin-bottom: 4px
}

.author-row a,
.author-row span {
    color: #000000;
    font-size: 18px;
    font-weight: 500;
    text-decoration: none
}

.author-row a:hover {
    color: #0284c7
}

/* Affiliation */
.affiliation {
    font-size: 16px;
    color: #475569;
    margin-bottom: 24px;
    line-height: 1.5
}

/* Buttons */
.btn-row {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
    margin-top: 12px
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 600;
    background: #0284c7;
    color: #fff;
    border: 1px solid #0284c7;
    transition: .2s
}

.btn:hover {
    background: #0369a1;
    border-color: #0369a1;
    color: #fff;
    text-decoration: none
}

.btn.btn-outline {
    background: transparent;
    color: #0284c7
}

.btn.btn-outline:hover {
    background: #f0f9ff
}

.btn svg {
    width: 18px;
    height: 18px;
    fill: currentColor
}

/* ===== Sections ===== */
section {
    padding: 56px 0;
    border-bottom: 1px solid #e2e8f0
}

section:last-child {
    border-bottom: none
}

section h2 {
    font-size: 30px;
    font-weight: 700;
    margin-bottom: 24px;
    padding-bottom: 10px;
    border-bottom: 2px solid #cbd5e1;
    color: #0c4a6e;
    display: block;
    text-align: center
}

/* Two column layout */
.split-layout {
    display: flex;
    align-items: flex-start;
    gap: 40px;
    flex-wrap: wrap
}

.split-layout>.text-content {
    flex: 1;
    min-width: 300px
}

.split-layout>.image-content {
    flex: 1;
    min-width: 300px;
    display: flex;
    flex-direction: column;
    align-items: center
}

/* Abstract box */
.abstract-box {
    font-size: 17px;
    line-height: 1.8;
    text-align: justify;
    color: #334155
}

/* Figures */
.fig-wrap {
    text-align: center;
    margin: 16px 0;
    width: 100%
}

.fig-wrap img {
    border-radius: 6px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, .06);
    margin: 0 auto
}

.fig-caption {
    font-size: 15px;
    color: #64748b;
    margin-top: 12px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.5
}

/* Experiment Block */
.exp-block {
    margin-bottom: 48px
}

.exp-block h3 {
    font-size: 20px;
    color: #0f172a;
    margin-bottom: 16px;
    font-weight: 600
}

.exp-images {
    display: flex;
    gap: 24px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 20px
}

.exp-images img {
    max-height: 400px;
    object-fit: contain;
    border-radius: 6px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, .05)
}

/* Conclusion Box */
.conclusion-box {
    background: #f0f9ff;
    border-left: 4px solid #0284c7;
    padding: 16px 24px;
    border-radius: 0 8px 8px 0;
    font-size: 17px;
    color: #0f172a
}

.conclusion-box strong {
    color: #0c4a6e
}

/* Contribution list */
.contrib-list {
    list-style: none;
    padding: 0
}

.contrib-list li {
    padding: 12px 0 12px 32px;
    position: relative;
    font-size: 17px;
    color: #334155
}

.contrib-list li::before {
    content: "▶";
    position: absolute;
    left: 0;
    color: #0284c7;
    font-size: 14px;
    top: 14px
}

.contrib-list li strong {
    color: #0f172a
}

/* Method steps */
.method-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-top: 32px
}

.step {
    background: #fff;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    padding: 24px;
    font-size: 17px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, .02)
}

.step-a {
    background-color: #f1f8f3;
    /* Light green */
    border-color: #2e7948;
}

.step-b {
    background-color: #f2f6fc;
    /* Light blue */
    border-color: #27558c;
}

.step-c {
    background-color: #fae3cb;
    /* Light peach/flesh */
    border-color: #f58e66e9;
}

.step-title {
    font-weight: 700;
    color: #0284c7;
    margin-bottom: 12px;
    font-size: 20px
}

/* Footer */
footer {
    text-align: center;
    padding: 40px 0;
    color: #64748b;
    font-size: 14px;
    background: #f1f5f9
}