:root {
    --bg-color: #f2f2f2;
    --border-color: #dddddd;
    --text-main: #1a1a1a;
    --text-sub: #666666;
    --color-pink: #FFB3AD;
    --color-green: #ADEBB3;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    min-height: 100vh;
    color: var(--text-main);
}

/* Navigation bar */
.nav-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-color);
}

.nav-bar a {
    font-size: 0.75rem;
    color: var(--text-sub);
    text-decoration: none;
}

.nav-bar a:hover {
    color: var(--text-main);
}

.nav-label {
    font-size: 0.75rem;
    color: var(--text-sub);
}

/* Language switcher */
.nav-right {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.lang-switcher {
    display: flex;
    gap: 0.1rem;
}

.lang-btn {
    background: none;
    border: none;
    padding: 0.1rem 0.25rem;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    font-size: 0.75rem;
    color: var(--text-sub);
    cursor: pointer;
    letter-spacing: 0.03em;
}

.lang-btn:hover { color: var(--text-main); }

.lang-btn.active {
    color: var(--text-main);
    font-weight: 700;
}

/* Offer label inside a square */
.offer-num {
    font-size: 0.6rem;
    font-weight: 600;
    color: var(--text-sub);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin: 0 0 0.4rem 0;
}

.offer-label {
    font-size: 1rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin: 0;
    color: var(--text-main);
}

/* Grid */
.grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1px;
    background-color: var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

@media (min-width: 768px) {
    .grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* Square cells */
.square {
    aspect-ratio: 1 / 1;
    background-color: #ffffff;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    padding: 10%;
    position: relative;
    opacity: 0;
    transform: translateY(15px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.square.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Full-width cells spanning all columns */
.span-2 {
    grid-column: span 2;
    aspect-ratio: auto;
}

.span-4 {
    grid-column: 1 / -1;
    aspect-ratio: auto;
}

/* Flip card */
.flip-card {
    perspective: 1000px;
    cursor: pointer;
}

.flip-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
    transition: transform 0.8s ease;
}

.flip-card.flipped .flip-card-inner {
    transform: rotateY(180deg);
}

.flip-card-front,
.flip-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    padding: 10%;
}

.flip-card-back {
    transform: rotateY(180deg);
    background-color: #ffffff;
}

/* Typography */
.text-main {
    color: var(--text-main);
}

.text-sub {
    color: var(--text-sub);
}

.label {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--text-main);
    margin-bottom: 0.5rem;
}

.label-stack {
    font-size: 0.85rem;
    font-weight: 700;
    line-height: 1.6;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.desc-en {
    font-size: 0.8rem;
    font-weight: 600;
    line-height: 1.5;
    color: var(--text-main);
    margin-bottom: 0.5rem;
}

.desc-other {
    font-size: 0.7rem;
    font-weight: 400;
    line-height: 1.5;
    color: var(--text-sub);
}

/* Links */
a {
    color: var(--text-main);
}

.link-plain {
    color: var(--text-main);
    text-decoration: underline;
    font-size: 0.8rem;
}

.link-plain:hover {
    color: var(--text-sub);
}

.arrow-link {
    display: block;
    font-size: 0.8rem;
    color: var(--text-main);
    text-decoration: none;
    margin-bottom: 0.4rem;
    line-height: 1.4;
}

.arrow-link:hover {
    text-decoration: underline;
}

/* Contact form */
.contact-form {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    background-color: var(--bg-color);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    font-size: 0.8rem;
    color: var(--text-main);
    outline: none;
    border-radius: 0;
    -webkit-appearance: none;
    appearance: none;
}

.contact-form textarea {
    resize: vertical;
    min-height: 80px;
}

.contact-form input:focus,
.contact-form textarea:focus {
    border-color: var(--text-main);
}

.contact-form button {
    width: 100%;
    padding: 0.6rem;
    background-color: var(--text-main);
    color: #ffffff;
    border: none;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: 0;
    -webkit-appearance: none;
    appearance: none;
}

.contact-form button:hover {
    background-color: var(--text-sub);
}

/* Square with contact form — no aspect ratio constraint */
.square-form {
    aspect-ratio: auto;
    min-height: 0;
    padding: 10%;
}

/* Section section separators */
.section-gap {
    grid-column: 1 / -1;
    height: 1px;
    background-color: var(--border-color);
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.75rem;
}

th {
    text-align: left;
    font-weight: 600;
    font-size: 0.7rem;
    color: var(--text-sub);
    border-bottom: 1px solid var(--border-color);
    padding: 0.4rem 0.5rem 0.4rem 0;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

td {
    padding: 0.4rem 0.5rem 0.4rem 0;
    border-bottom: 1px solid var(--border-color);
    vertical-align: top;
    line-height: 1.4;
    color: var(--text-main);
}

tr:last-child td {
    border-bottom: none;
}

/* Stat grid for report metrics */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1px;
    background-color: var(--border-color);
    width: 100%;
}

.stat-cell {
    background-color: #ffffff;
    padding: 0.75rem;
}

.stat-value {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-main);
    line-height: 1;
}

.stat-label {
    font-size: 0.65rem;
    color: var(--text-sub);
    margin-top: 0.25rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

/* Full-width content row (no aspect ratio) */
.row-full {
    grid-column: 1 / -1;
    background-color: #ffffff;
    padding: 2rem;
    aspect-ratio: auto;
}

.row-full h2 {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin: 0 0 1rem 0;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.row-full p {
    font-size: 0.8rem;
    line-height: 1.7;
    color: var(--text-main);
    margin: 0 0 0.75rem 0;
}

.row-full ul {
    font-size: 0.8rem;
    line-height: 1.7;
    color: var(--text-main);
    margin: 0 0 0.75rem 0;
    padding-left: 1.2rem;
}

.row-full li {
    margin-bottom: 0.5rem;
}

/* Chart containers */
.chart-container {
    position: relative;
    width: 100%;
    height: 200px;
}

@media (min-width: 768px) {
    .chart-container {
        height: 260px;
    }
}

/* Report header */
.report-header {
    grid-column: 1 / -1;
    background-color: var(--text-main);
    color: #ffffff;
    padding: 2rem;
    aspect-ratio: auto;
}

.report-header h1 {
    font-size: 1rem;
    font-weight: 700;
    margin: 0 0 0.25rem 0;
    letter-spacing: 0.02em;
}

.report-header .subtitle {
    font-size: 0.75rem;
    color: rgba(255,255,255,0.6);
}

/* Badge / pill */
.badge {
    display: inline-block;
    font-size: 0.6rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 0.15rem 0.4rem;
    background-color: var(--bg-color);
    color: var(--text-sub);
}

.badge-active { background-color: var(--color-green); color: var(--text-main); }
.badge-slow   { background-color: #FFF5CC; color: var(--text-main); }
.badge-stale  { background-color: var(--color-pink); color: var(--text-main); }
.badge-flag   { background-color: var(--color-pink); color: var(--text-main); }