/* ── Reset & Base ── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --color-obsidian: #FAFAFA;
    --color-surface: #FFFFFF;
    --color-platinum: #111827;
    --color-ashen: #6B7280;
    --color-border: #D1D5DB;
    --font-serif: 'Cormorant Garamond', serif;
    --font-sans: 'Inter', sans-serif;
    --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

.dark {
    --color-obsidian: #0A0A0A;
    --color-surface: #121212;
    --color-platinum: #E5E7EB;
    --color-ashen: #9CA3AF;
    --color-border: #374151;
}

html, body {
    height: 100%;
    font-family: var(--font-sans);
    background: var(--color-obsidian);
    color: var(--color-platinum);
    transition: background-color 0.2s ease, color 0.2s ease;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ── Layout ── */
.page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding: 2rem 1.5rem;
}

/* ── Background ── */
.bg-gradient {
    position: absolute;
    inset: 0;
    z-index: 0;
    opacity: 0.25;
    pointer-events: none;
}
.bg-gradient::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at center, rgba(75, 85, 99, 0.15) 0%, transparent 70%);
}
.bg-gradient::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image: radial-gradient(rgba(75, 85, 99, 0.4) 1px, transparent 1px);
    background-size: clamp(40px, 2.5vw, 80px) clamp(40px, 2.5vw, 80px);
    opacity: 0.2;
}

.content {
    position: relative;
    z-index: 10;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    max-width: clamp(640px, 45vw, 960px);
    width: 100%;
}

/* ── Logo ── */
.logo {
    margin-bottom: 2.5rem;
    opacity: 0;
    animation: fadeUp 0.8s var(--ease) forwards;
}
.logo-brand {
    font-family: var(--font-serif);
    font-size: clamp(1.5rem, 1.2vw, 2.4rem);
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-platinum);
}
.logo-diamond {
    margin: 0 0.5rem;
    font-size: clamp(0.6rem, 0.5vw, 1rem);
    vertical-align: middle;
    color: var(--color-ashen);
}
.logo-product {
    font-family: var(--font-sans);
    font-size: clamp(0.85rem, 0.7vw, 1.35rem);
    font-weight: 300;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--color-ashen);
}

/* ── Coming Soon Label ── */
.label {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
    opacity: 0;
    animation: fadeUp 0.8s var(--ease) 0.15s forwards;
}
.label-line {
    width: 3rem;
    height: 1px;
    background: var(--color-ashen);
    opacity: 0.3;
}
.label-text {
    font-family: var(--font-sans);
    font-size: clamp(0.7rem, 0.55vw, 1.1rem);
    font-weight: 400;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--color-ashen);
}

/* ── Tagline ── */
.tagline {
    font-family: var(--font-serif);
    font-size: clamp(2.25rem, 2.2vw, 4rem);
    font-weight: 300;
    line-height: 1.3;
    color: var(--color-platinum);
    margin-bottom: 1.25rem;
    opacity: 0;
    animation: fadeUp 0.8s var(--ease) 0.3s forwards;
}

/* ── Subline ── */
.subline {
    font-family: var(--font-sans);
    font-size: clamp(1rem, 0.85vw, 1.6rem);
    font-weight: 300;
    line-height: 1.6;
    color: var(--color-ashen);
    margin-bottom: 2.5rem;
    opacity: 0;
    animation: fadeUp 0.8s var(--ease) 0.45s forwards;
}

/* ── Link Buttons ── */
.link-buttons {
    display: flex;
    align-items: stretch;
    gap: 0;
    width: 100%;
    max-width: clamp(500px, 38vw, 740px);
    margin-bottom: 2.5rem;
    opacity: 0;
    animation: fadeUp 0.8s var(--ease) 0.6s forwards;
}

.link-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: transparent;
    border: 1px solid var(--color-border);
    padding: clamp(0.75rem, 0.6vw, 1.2rem) clamp(0.75rem, 0.6vw, 1.4rem);
    font-family: var(--font-sans);
    font-size: clamp(0.7rem, 0.55vw, 1rem);
    font-weight: 400;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-platinum);
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.link-btn + .link-btn {
    border-left: none;
}

.link-btn:hover {
    background: var(--color-platinum);
    color: var(--color-obsidian);
    border-color: var(--color-platinum);
}

.link-btn:active {
    transform: scale(0.98);
}

.link-icon {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

/* ── Controls ── */
.controls {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    opacity: 0;
    animation: fadeUp 0.8s var(--ease) 0.75s forwards;
}

/* Language dropdown */
.lang-dropdown {
    position: relative;
    display: inline-block;
}
.lang-trigger {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    background: transparent;
    border: none;
    color: var(--color-ashen);
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 400;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    cursor: pointer;
    padding: 0.25rem 0;
    transition: color 0.2s ease;
}
.lang-trigger:hover {
    color: var(--color-platinum);
}
.lang-chevron {
    width: 16px;
    height: 16px;
    transition: transform 0.2s ease;
}
.lang-dropdown.open .lang-chevron {
    transform: rotate(180deg);
}
.lang-panel {
    display: none;
    position: absolute;
    bottom: calc(100% + 0.5rem);
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 0.5rem;
    box-shadow: 0 8px 30px rgba(0,0,0,0.12);
    min-width: 180px;
    max-height: 260px;
    overflow-y: auto;
    z-index: 100;
    padding: 0.375rem 0;
}
.lang-dropdown.open .lang-panel {
    display: block;
}
.lang-option {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    width: 100%;
    padding: 0.5rem 1rem;
    background: transparent;
    border: none;
    cursor: pointer;
    text-align: left;
    transition: background 0.15s ease;
    color: inherit;
}
.lang-option:hover {
    background: var(--color-obsidian);
}
.lang-option-code {
    font-family: var(--font-sans);
    font-size: 0.65rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-ashen);
    width: 1.75rem;
    flex-shrink: 0;
}
.lang-option-name {
    font-family: var(--font-sans);
    font-size: 0.8rem;
    font-weight: 400;
    color: var(--color-platinum);
    flex: 1;
}
.lang-option-check {
    font-size: 0.75rem;
    color: var(--color-platinum);
    opacity: 0;
    margin-left: auto;
}
.lang-option.active .lang-option-check {
    opacity: 1;
}

/* Scrollbar */
.lang-panel::-webkit-scrollbar { width: 6px; }
.lang-panel::-webkit-scrollbar-track { background: transparent; border-radius: 4px; }
.lang-panel::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: 4px; }
.lang-panel::-webkit-scrollbar-thumb:hover { background: var(--color-ashen); }

/* Separator */
.ctrl-sep {
    width: 1px;
    height: 1rem;
    background: var(--color-ashen);
    opacity: 0.3;
}

/* Theme toggle */
.theme-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--color-ashen);
    transition: color 0.2s ease;
    padding: 0.25rem;
    display: flex;
    align-items: center;
}
.theme-btn:hover {
    color: var(--color-platinum);
}
.theme-btn svg {
    width: 18px;
    height: 18px;
}
.theme-btn .icon-sun { display: none; }
.theme-btn .icon-moon { display: block; }
.dark .theme-btn .icon-sun { display: block; }
.dark .theme-btn .icon-moon { display: none; }

/* ── Footer ── */
.footer {
    position: absolute;
    bottom: 1.5rem;
    left: 0;
    right: 0;
    text-align: center;
    font-family: var(--font-sans);
    font-size: clamp(0.7rem, 0.5vw, 1rem);
    font-weight: 300;
    color: var(--color-ashen);
    opacity: 0.6;
    z-index: 10;
}
.footer a {
    color: var(--color-ashen);
    text-decoration: none;
    transition: color 0.2s ease;
}
.footer a:hover {
    color: var(--color-platinum);
}

html:not(.dark) .footer {
    opacity: 1;
}

/* ── Animations ── */
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(16px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ── Responsive — Small ── */
@media (max-width: 640px) {
    .tagline {
        font-size: 1.65rem;
    }
    .subline {
        font-size: 0.9rem;
    }
    .link-buttons {
        flex-wrap: wrap;
        max-width: 100%;
    }
    .link-btn {
        flex: 1 1 calc(50% - 0px);
        border: 1px solid var(--color-border);
    }
    .link-btn + .link-btn {
        border-left: 1px solid var(--color-border);
    }
    /* top row */
    .link-btn:nth-child(1),
    .link-btn:nth-child(2) {
        border-bottom: none;
    }
    /* remove inner borders for grid effect */
    .link-btn:nth-child(1) { border-right: none; }
    .link-btn:nth-child(3) { border-right: none; }
}

/* ── Responsive — Large (2K+) ── */
@media (min-width: 1800px) {
    .page { padding: 4rem 2rem; }
    .logo { margin-bottom: 3.5rem; }
    .label { margin-bottom: 2.75rem; gap: 1.5rem; }
    .label-line { width: 5rem; }
    .tagline { margin-bottom: 1.75rem; }
    .subline { margin-bottom: 3.5rem; }
    .link-buttons { margin-bottom: 3.5rem; }
    .controls { gap: 2rem; }
    .theme-btn svg { width: 24px; height: 24px; }
}

/* ── Responsive — Extra-large (3K+) ── */
@media (min-width: 2400px) {
    .page { padding: 6rem 3rem; }
    .logo { margin-bottom: 4.5rem; }
    .label { margin-bottom: 3.5rem; gap: 2rem; }
    .label-line { width: 6rem; }
    .tagline { margin-bottom: 2.25rem; }
    .subline { margin-bottom: 4.5rem; }
    .link-buttons { margin-bottom: 4.5rem; }
    .controls { gap: 2.5rem; }
    .theme-btn svg { width: 28px; height: 28px; }
    .footer { bottom: 2.5rem; }
}