/* ══════════════════════════════════════
   ATL ARQUITECTOS — Sistema de Diseño
   ══════════════════════════════════════ */

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

:root {
    --bg: #080808;
    --white: #ffffff;
    --lilac: #c4b5d4;
    --amber: #d4845a;
    --gray: #666666;
    --font-title: 'Barlow Condensed', sans-serif;
    --font-body: 'Inter', sans-serif;
}

html { scroll-behavior: smooth; }
body {
    background: var(--bg);
    color: var(--white);
    font-family: var(--font-body);
    overflow-x: hidden;
}

/* ── CURSOR ── */
.cursor {
    width: 6px; height: 6px;
    background: var(--white);
    border-radius: 50%;
    position: fixed;
    pointer-events: none;
    z-index: 9999;
    mix-blend-mode: difference;
}
.cursor-ring {
    width: 32px; height: 32px;
    border: 1px solid rgba(255,255,255,0.4);
    border-radius: 50%;
    position: fixed;
    pointer-events: none;
    z-index: 9998;
    transition: all 0.12s ease;
}

/* ── NAV ── */
nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    padding: 2rem 3rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.5s ease, backdrop-filter 0.5s ease, padding 0.4s ease;
    border-bottom: 1px solid transparent;
}
nav.scrolled {
    background: rgba(8,8,8,0.6);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-bottom: 1px solid rgba(255,255,255,0.06);
    padding: 1.2rem 3rem;
}
.nav-logo {
    font-family: var(--font-title);
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--white);
    text-decoration: none;
    display: inline-flex;
    align-items: baseline;
}
.nav-logo span { font-weight: 200; opacity: 0.75; margin-left: 5px; letter-spacing: 0.1em; text-transform: none; }
.nav-links { display: flex; gap: 2.5rem; list-style: none; }
.nav-links a {
    font-size: 0.65rem;
    font-weight: 300;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: rgba(255,255,255,0.65);
    text-decoration: none;
    transition: color 0.3s;
}
.nav-links a:hover, .nav-links a.active { color: var(--white); }
.nav-social {
    display: flex;
    gap: 1.2rem;
    margin-left: 2rem;
    padding-left: 2rem;
    border-left: 1px solid rgba(255,255,255,0.12);
}
.nav-social a {
    color: rgba(255,255,255,0.45);
    text-decoration: none;
    font-size: 1rem;
    transition: color 0.3s;
    line-height: 1;
    display: flex;
    align-items: center;
}
.nav-social a:hover { color: var(--white); }

/* ── SECTION LABEL ── */
.section-label {
    font-size: 0.6rem;
    font-weight: 300;
    letter-spacing: 0.4em;
    text-transform: uppercase;
    color: var(--lilac);
    margin-bottom: 3rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
}
.section-label::before {
    content: '';
    width: 3rem; height: 1px;
    background: var(--lilac);
    flex-shrink: 0;
}

/* ── PAGE HERO (páginas internas) ── */
.page-hero {
    position: relative;
    width: 100vw;
    height: 55vh;
    overflow: hidden;
    display: flex;
    align-items: flex-end;
    padding: 5rem;
}
.page-hero-bg {
    position: absolute;
    inset: -10%;
    background-size: cover;
    background-position: center;
    filter: brightness(0.3);
}
.page-hero-fade {
    position: absolute;
    bottom: 0; left: 0; right: 0;
    height: 60%;
    background: linear-gradient(to top, var(--bg) 0%, transparent 100%);
}
.page-hero-bg    { z-index: 0; }
.page-hero-fade  { z-index: 1; }
.page-hero-content { position: relative; z-index: 2; }
.page-hero h1 {
    font-family: var(--font-title);
    font-size: clamp(3rem, 7vw, 6rem);
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    line-height: 0.9;
}
.page-hero p {
    font-size: 0.7rem;
    font-weight: 300;
    letter-spacing: 0.2em;
    color: rgba(255,255,255,0.5);
    text-transform: uppercase;
    margin-top: 1rem;
}

/* ── BOTONES ── */
.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
    padding: 1rem 2.5rem;
    background: var(--white);
    color: var(--bg);
    font-size: 0.65rem;
    font-weight: 500;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    text-decoration: none;
    transition: background 0.3s;
    font-family: var(--font-body);
}
.btn-primary:hover { background: var(--lilac); }
.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
    padding: 1rem 2.5rem;
    border: 1px solid rgba(255,255,255,0.3);
    color: var(--white);
    font-size: 0.65rem;
    font-weight: 300;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    text-decoration: none;
    transition: border-color 0.3s, background 0.3s;
    font-family: var(--font-body);
}
.btn-secondary:hover { border-color: var(--white); background: rgba(255,255,255,0.04); }

/* ── FOOTER ── */
footer {
    padding: 5rem;
    border-top: 1px solid rgba(255,255,255,0.06);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.footer-logo {
    font-family: var(--font-title);
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--white);
    text-decoration: none;
    display: inline-flex;
    align-items: baseline;
}
.footer-logo span { font-weight: 200; opacity: 0.6; margin-left: 5px; letter-spacing: 0.1em; text-transform: none; }
.footer-links { display: flex; gap: 2rem; list-style: none; }
.footer-links a {
    font-size: 0.6rem;
    font-weight: 400;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: rgba(255,255,255,0.60);
    text-decoration: none;
    transition: color 0.3s;
}
.footer-links a:hover { color: var(--white); }
.footer-copy {
    font-size: 0.55rem;
    font-weight: 400;
    letter-spacing: 0.1em;
    color: rgba(255,255,255,0.50);
}

/* ── SCROLL REVEAL ── */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.9s ease, transform 0.9s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ══════════════════════════════════════
   SCROLL INDICATOR (hero de subpáginas)
   ══════════════════════════════════════ */
.page-scroll-hint {
    position: absolute;
    bottom: 2.5rem;
    left: 0;
    right: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    z-index: 5;
    pointer-events: none;
    animation: atlFadeUp 1s ease 0.8s both;
}
.page-scroll-hint span {
    font-size: 0.48rem;
    font-weight: 300;
    letter-spacing: 0.35em;
    text-transform: uppercase;
    color: rgba(255,255,255,0.35);
}
.page-scroll-hint-line {
    width: 1px;
    height: 3rem;
    background: linear-gradient(to bottom, rgba(255,255,255,0.35), transparent);
    animation: atlScrollPulse 2s ease-in-out infinite;
}

@keyframes atlFadeUp {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
}
@keyframes atlScrollPulse {
    0%,100% { opacity: 0.2; transform: scaleY(0.85); }
    50%      { opacity: 1;   transform: scaleY(1); }
}

/* ══════════════════════════════════════
   SECTION DOTS (navegación lateral fija)
   ══════════════════════════════════════ */
.section-dots {
    position: fixed;
    right: 2rem;
    top: 50%;
    transform: translateY(-50%);
    z-index: 900;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    align-items: center;
    background: rgba(8, 8, 8, 0.45);
    padding: 0.8rem 0.55rem;
    border-radius: 20px;
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
}
.section-dot {
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: rgba(255,255,255,0.2);
    border: 1px solid rgba(255,255,255,0.25);
    cursor: pointer;
    transition: background 0.35s ease, transform 0.35s ease, border-color 0.35s ease;
    position: relative;
}
.section-dot:hover {
    background: rgba(255,255,255,0.5);
    transform: scale(1.3);
}
.section-dot.active {
    background: var(--white);
    border-color: var(--white);
    transform: scale(1.4);
}
/* Tooltip al hover */
.section-dot::before {
    content: attr(data-label);
    position: absolute;
    right: calc(100% + 0.8rem);
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.48rem;
    font-weight: 300;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: rgba(255,255,255,0.5);
    white-space: nowrap;
    opacity: 0;
    transition: opacity 0.25s ease;
    pointer-events: none;
}
.section-dot:hover::before { opacity: 1; }

@media (max-width: 900px) {
    .section-dots { display: none; }
    .page-scroll-hint { display: none; }
}

/* ── RESPONSIVE ── */
@media (max-width: 900px) {
    nav { padding: 1.5rem 2rem; }
    .nav-links { display: none; }
    .page-hero { padding: 3rem 2rem; height: 45vh; }
    footer { padding: 3rem 2rem; flex-direction: column; gap: 2rem; text-align: center; align-items: center; }
}