:root {
    --accent: #00b4d8;
    --accent2: #4cc9f0;
    --text: #222;
    --sub: #666;
    --bg: #f7f8fb;
    --card: rgba(255, 255, 255, 0.72);
    --border: rgba(255, 255, 255, 0.45);
    --shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
    --radius: 20px;
    --transition: 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: "Inter", "Noto Sans JP", sans-serif;
    background: var(--bg);
    color: var(--text);
    overflow-x: hidden;
    transition: background 0.3s ease, color 0.3s ease;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    background:
        radial-gradient(circle at top right,
            rgba(0, 180, 216, 0.12),
            transparent 45%),
        radial-gradient(circle at bottom left,
            rgba(76, 201, 240, 0.08),
            transparent 45%),
        url("background.png") center / 70% no-repeat;
    opacity: 0.18;
    z-index: -2;
}

#light {
    position: fixed;
    width: 240px;
    height: 240px;
    border-radius: 50%;
    pointer-events: none;
    transform: translate(-50%, -50%);
    background: radial-gradient(
        circle,
        rgba(0, 180, 216, 0.18),
        transparent 72%
    );
    z-index: 999;
}

/* ================= HEADER ================= */

header {
    position: sticky;
    top: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 40px;
    backdrop-filter: blur(18px);
    background: rgba(255, 255, 255, 0.65);
    border-bottom: 1px solid rgba(255, 255, 255, 0.45);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

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

    color: inherit;
    text-decoration: none;

    font-size: 24px;
    font-weight: 800;
}

.logo img {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    padding: 1.5px;
    background: rgba(255,255,255,.7);
    box-shadow:
        0 8px 20px rgba(0,0,0,.12);
}

.dark .logo img {
    background: rgba(255,255,255,.1);
}

/* ================= NAV ================= */

nav {
    display: flex;
    align-items: center;
    gap: 24px;
}

nav a {
    position: relative;
    color: var(--sub);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--transition);
}

nav a:hover {
    color: var(--accent);
}

nav a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -6px;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width 0.25s ease;
}

nav a:hover::after {
    width: 100%;
}

/* ================= ACTION BUTTONS ================= */

.actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.lang-btn,
.theme-btn,
.menu-btn {
    width: 46px;
    height: 46px;
    border: none;
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(16px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
    cursor: pointer;
    font-size: 18px;
    transition:
        transform var(--transition),
        background var(--transition),
        color var(--transition),
        box-shadow var(--transition);
}

.lang-btn:hover,
.theme-btn:hover,
.menu-btn:hover {
    transform: translateY(-3px);
    background: var(--accent);
    color: white;
    box-shadow: 0 14px 35px rgba(0, 180, 216, 0.28);
}

.menu-btn {
    display: none;
}

/* ================= COMMON ================= */

section {
    scroll-margin-top: 100px;
    width: min(1100px, 92%);
    margin: 0 auto;
    padding: 40px 0;
}

h1 {
    font-size: clamp(52px, 9vw, 82px);
    line-height: 1;
    font-weight: 900;
    margin-bottom: 18px;
}

h2 {
    font-size: 38px;
    margin-bottom: 28px;
}

h3 {
    font-size: 24px;
    margin: 50px 0 24px;
}

p {
    color: var(--sub);
    line-height: 1.8;
}

/* ================= HERO ================= */

.hero {
    min-height: calc(100vh - 80px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 28px;
}

.hero-title {
    display:flex;
    align-items:center;
    gap:50px;
}

.hero-text {
    max-width: 720px;
    font-size: clamp(18px, 2vw, 24px);
}

.hero h1 {
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-image{
    width:240px;
    height:240px;
    flex-shrink:0;
    border-radius:50%;
    display:flex;
    align-items:center;
    justify-content:center;
     background:
        radial-gradient(
            circle,
            rgba(0,180,216,.18),
            transparent 70%
        );
    order: 2;        
}


.hero-image img{
    width:80%;
    height:80%;
    border-radius:50%;
    object-fit:contain;
    filter:
        drop-shadow(
            0 20px 30px rgba(0,0,0,.15)
        );
}

.hero-title-text {
    order:1;
}


/* ================= CARDS ================= */

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 18px;
    margin-top: 12px;
}

.card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 22px;
    background: var(--card);
    backdrop-filter: blur(18px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition:
        transform var(--transition),
        box-shadow var(--transition),
        border-color var(--transition);
}

.card:hover {
    transform: translateY(-8px);
    border-color: rgba(0, 180, 216, 0.35);
    box-shadow: 0 18px 45px rgba(0, 180, 216, 0.18);
}

.card i:not(.arrow) {
    width: 48px;
    height: 48px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(
        135deg,
        rgba(0, 180, 216, 0.15),
        rgba(76, 201, 240, 0.25)
    );
    color: var(--accent);
    font-size: 20px;
    flex-shrink: 0;
}

.card span {
    font-weight: 500;
}

.card .arrow {
    margin-left: auto;
    opacity: .45;
    transition: transform .25s ease, opacity .25s ease;
}

.card:hover .arrow {
    opacity: 1;
    transform: translate(4px, -4px);
}

.teamhowls-link{
  display:flex;
  align-items:center;
  gap:10px;
  text-decoration:none;
  color:inherit;
  transition:.3s;
}

.teamhowls-link:hover{
  transform:translateY(-3px);
  opacity:.8;
}

.teamhowls-link img{
  width:40px;
  height:40px;
  object-fit:contain;
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(
      135deg,
      rgba(0, 180, 216, 0.15),
      rgba(76, 201, 240, 0.25)
  );
  color: var(--accent);
  font-size: 20px;
  flex-shrink: 0;
}

.teamhowls-link:hover span {
  text-decoration: underline;
}

/* ================= TIMELINE ================= */

.timeline {
    position: relative;
    margin-top: 28px;
    padding-left: 40px;
}

.timeline::before {
    content: "";
    position: absolute;
    left: 10px;
    top: 0;
    bottom: 0;
    width: 3px;
    border-radius: 999px;
    background: linear-gradient(
        to bottom,
        var(--accent),
        var(--accent2)
    );
}

.year {
    position: relative;
    margin-bottom: 42px;
}

.year:last-child {
    margin-bottom: 0;
}

.year::before {
    content: "";
    position: absolute;
    left: -39px;
    top: 8px;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 0 6px rgba(0, 180, 216, 0.15);
}

.year-title {
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 12px;
}

.year ul {
    margin-left: 18px;
}

.year li {
    margin-bottom: 10px;
    line-height: 1.8;
}

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

/* ================= FADE ANIMATION ================= */

.fade {
    opacity: 0;
    transform: translateY(40px);
    transition:
        opacity 0.8s ease,
        transform 0.8s ease;
}

.fade.show {
    opacity: 1;
    transform: translateY(0);
}

/* ================= LINKS ================= */

.link-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 22px;
    margin-top: 20px;
}

.link-card {
    position: relative;
    display: flex;
    align-items: center;
    gap: 18px;
    padding: 22px;
    text-decoration: none;
    color: inherit;
    background: var(--card);
    backdrop-filter: blur(18px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition:
        transform var(--transition),
        box-shadow var(--transition),
        border-color var(--transition);
}

.link-card::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(
        120deg,
        transparent,
        rgba(255, 255, 255, 0.28),
        transparent
    );
    transform: translateX(-120%);
    transition: transform 0.8s ease;
}

.link-card:hover::before {
    transform: translateX(120%);
}

.link-card:hover {
    transform: translateY(-8px);
    border-color: rgba(0, 180, 216, 0.4);
    box-shadow: 0 18px 45px rgba(0, 180, 216, 0.18);
}

.link-card .icon {
    width: 60px;
    height: 60px;
    border-radius: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    background: linear-gradient(
        135deg,
        rgba(0, 180, 216, 0.12),
        rgba(76, 201, 240, 0.24)
    );
    color: var(--accent);
    font-size: 28px;
}

.link-card h4 {
    margin-bottom: 4px;
    font-size: 20px;
}

.link-card p {
    margin: 0;
    font-size: 14px;
    color: var(--sub);
}

.arrow {
    margin-left: auto;
    opacity: .45;
    transition: transform .25s ease, opacity .25s ease;
}

.link-card:hover .arrow {
    opacity: 1;
    transform: translate(4px, -4px);
}

/* ================= DARK MODE ================= */

.dark {
    --bg: #101114;
    --text: #f5f5f5;
    --sub: #bcbcbc;
    --card: rgba(28, 28, 32, 0.82);
    --border: rgba(255, 255, 255, 0.08);
    --shadow: 0 16px 45px rgba(0, 0, 0, 0.45);
}

.dark header {
    background: rgba(18, 18, 18, 0.68);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.dark .lang-btn,
.dark .theme-btn,
.dark .menu-btn {
    background: #1d1d22;
    color: #fff;
}

.dark nav a {
    color: #ddd;
}

.dark nav a:hover {
    color: var(--accent2);
}

.dark .card i,
.dark .link-card .icon {
    color: var(--accent2);
}

/* ================= SCROLL BAR ================= */

::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: #b8b8b8;
    border-radius: 999px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent);
}

/* ================= FOOTER ================= */

footer {
    margin-top: 50px;
    padding: 30px 20px;
    text-align: center;

    background: rgba(255, 255, 255, 0.06);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);

    border-top: 1px solid rgba(255,255,255,0.12);

    color: rgba(255,255,255,0.7);
    font-size: 0.9rem;
}

footer p {
    margin: 6px 0;
}

/* ================= RESPONSIVE ================= */

@media (max-width: 900px) {
    header {
        padding: 18px 24px;
    }

    section {
        width: 94%;
    }

    nav {
        gap: 16px;
    }
}

@media (max-width: 768px) {
    header {
        flex-wrap: wrap;
        gap: 16px;
    }

    .menu-btn {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    nav {
        display: none;
        flex-direction: column;
        width: 100%;
        margin-top: 8px;
        gap: 0;
        background: rgba(255, 255, 255, 0.92);
        backdrop-filter: blur(18px);
        border-radius: 18px;
        overflow: hidden;
        box-shadow: 0 12px 35px rgba(0, 0, 0, 0.08);
    }

    .dark nav {
        background: #1b1b1f;
    }

    nav.open {
        display: flex;
    }

    nav a {
        padding: 16px 20px;
        border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    }

    .dark nav a {
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }

    .hero {
        min-height: auto;
        flex-direction:column;
        align-items:center;
        text-align:center;
        padding-top: 40px;
    }

    .hero-title{
        flex-direction:column;
        gap:25px;
        text-align:center;
    }

    .hero-title-text{
        order:2;
    }

    .hero-image{
        width:140px;
        height:140px;
        flex-shrink:0;
        display:flex;
        align-items:center;
        justify-content:center;
        position:relative;
        order:1;
    }

    .cards,
    .link-grid {
        grid-template-columns: 1fr;
    }

    .timeline {
        padding-left: 24px;
    }

    .timeline::before {
        left: 4px;
    }

    .year::before {
        left: -24px;
    }

    .link-card {
        padding: 20px;
    }

    .link-card .icon {
        width: 54px;
        height: 54px;
        font-size: 24px;
    }

    h1 {
        font-size: 48px;
    }

    h2 {
        font-size: 32px;
    }
}

@media (max-width: 480px) {
    header {
        padding: 14px 16px;
    }

    .logo {
        font-size: 22px;
    }

    .actions {
        gap: 8px;
    }

    .lang-btn,
    .theme-btn,
    .menu-btn {
        width: 42px;
        height: 42px;
        border-radius: 12px;
        font-size: 16px;
    }

    section {
        padding: 70px 0;
    }

    .hero-text {
        font-size: 17px;
    }

    .card {
        padding: 18px;
    }

    .year-title {
        font-size: 22px;
    }

    h3 {
        font-size: 20px;
    }
}

/* ================= GLOBAL TRANSITIONS ================= */

body,
header,
nav,
.card,
.link-card,
button {
    transition:
        background .3s ease,
        color .3s ease,
        border-color .3s ease,
        box-shadow .3s ease,
        transform .3s ease;
}