/* ============================================================
   7mo CONCURSO DE ROBÓTICA ITSA — style.css
   Estilo: Moderno-dinámico · Navy + Verde + Blanco
   Fuentes: Barlow Condensed (display) + DM Sans (cuerpo)
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Barlow+Condensed:ital,wght@0,300;0,600;0,700;0,800;0,900;1,700&family=DM+Sans:wght@300;400;500;600;700&display=swap');

/* ============================================================
   1. VARIABLES
   ============================================================ */
:root {
    /* Paleta principal */
    --navy:         #081428;
    --navy-mid:     #0d2044;
    --navy-light:   #122a5a;
    --green:        #16a34a;
    --green-light:  #22c55e;
    --green-bright: #4ade80;
    --green-dim:    rgba(22, 163, 74, 0.12);
    --green-glow:   0 0 24px rgba(34, 197, 94, 0.40);
    --sky:          #0ea5e9;
    --sky-dim:      rgba(14, 165, 233, 0.12);
    --white:        #ffffff;
    --off-white:    #f0f6ff;
    --surface:      #f8fafc;

    /* Texto */
    --text-dark:    #081428;
    --text-mid:     #334155;
    --text-muted:   #64748b;
    --text-light:   #94a3b8;

    /* Gradientes */
    --grad-hero:    linear-gradient(135deg, #081428 0%, #0d2044 45%, #0a2a1a 100%);
    --grad-green:   linear-gradient(90deg, #16a34a 0%, #0ea5e9 100%);
    --grad-card:    linear-gradient(145deg, #ffffff 0%, #f0f6ff 100%);
    --grad-dark:    linear-gradient(135deg, #081428 0%, #0d2044 100%);

    /* Bordes */
    --border-light: rgba(22, 163, 74, 0.20);
    --border-mid:   rgba(22, 163, 74, 0.45);
    --border-card:  #e2e8f0;

    /* Tipografía */
    --font-display: 'Barlow Condensed', sans-serif;
    --font-body:    'DM Sans', sans-serif;

    /* Layout */
    --nav-height:   72px;
    --radius-sm:    6px;
    --radius-md:    14px;
    --radius-lg:    24px;
    --radius-pill:  999px;

    /* Espaciado */
    --gap-xs:  0.5rem;
    --gap-sm:  1rem;
    --gap-md:  1.75rem;
    --gap-lg:  3.5rem;
    --gap-xl:  6rem;

    --transition: 0.22s cubic-bezier(0.4,0,0.2,1);
}

/* ============================================================
   2. RESET Y BASE
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
    background: var(--white);
    color: var(--text-dark);
    font-family: var(--font-body);
    font-weight: 400;
    line-height: 1.65;
    overflow-x: hidden;
}

::-webkit-scrollbar       { width: 5px; }
::-webkit-scrollbar-track { background: var(--navy); }
::-webkit-scrollbar-thumb { background: var(--green); border-radius: 3px; }

img { max-width: 100%; height: auto; display: block; }
a   { color: var(--green); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--green-light); }
ul, ol { list-style: none; }

/* ============================================================
   3. CONTENEDOR Y SECCIONES
   ============================================================ */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Sección clara (fondo blanco/gris) */
.section {
    padding: var(--gap-xl) 0;
}
.section--dark {
    background: var(--grad-dark);
    color: var(--white);
}
.section--tinted {
    background: var(--off-white);
}

/* Divisor diagonal entre secciones */
.section-wave {
    width: 100%;
    overflow: hidden;
    line-height: 0;
}
.section-wave svg { display: block; width: 100%; }

/* Encabezados de sección */
.section-header {
    text-align: center;
    margin-bottom: var(--gap-lg);
}

.section-eyebrow {
    display: inline-block;
    font-family: var(--font-display);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--green);
    background: var(--green-dim);
    border: 1px solid var(--border-light);
    padding: 0.3rem 1rem;
    border-radius: var(--radius-pill);
    margin-bottom: 0.85rem;
}
.section--dark .section-eyebrow {
    color: var(--green-bright);
    background: rgba(74, 222, 128, 0.10);
    border-color: rgba(74, 222, 128, 0.30);
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    line-height: 1.05;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    color: var(--text-dark);
}
.section--dark .section-title { color: var(--white); }

.section-title span {
    background: var(--grad-green);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-desc {
    margin-top: 0.75rem;
    font-size: 1.05rem;
    color: var(--text-muted);
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
}
.section--dark .section-desc { color: #94a3b8; }

/* Línea decorativa */
.title-bar {
    display: block;
    width: 56px;
    height: 4px;
    background: var(--grad-green);
    border-radius: 2px;
    margin: 1rem auto 0;
}

/* ============================================================
   4. NAVBAR
   ============================================================ */
.navbar {
    position: fixed;
    top: 0; left: 0;
    width: 100%;
    height: var(--nav-height);
    z-index: 1000;
    background: rgba(8, 20, 40, 0.96);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border-light);
    transition: background var(--transition), box-shadow var(--transition);
}
.navbar.scrolled {
    background: rgba(8, 20, 40, 1);
    box-shadow: 0 4px 30px rgba(0,0,0,0.35);
}

.navbar .container {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

/* Marca */
.navbar-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    flex-shrink: 0;
}
.navbar-brand img {
    height: 42px;
    width: auto;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-sigla {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 900;
    letter-spacing: 0.06em;
    color: var(--white);
}
.brand-sigla em {
    font-style: normal;
    background: var(--grad-green);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.brand-sub {
    font-size: 0.62rem;
    font-weight: 500;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: #64748b;
}

/* Links nav */
.navbar-nav {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}
.navbar-nav a {
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: #94a3b8;
    padding: 0.45rem 0.85rem;
    border-radius: var(--radius-sm);
    transition: color var(--transition), background var(--transition);
}
.navbar-nav a:hover,
.navbar-nav a.active {
    color: var(--white);
    background: rgba(255,255,255,0.07);
}
.navbar-nav a.active { color: var(--green-bright); }

/* Botón login */
.btn-nav-cta {
    font-family: var(--font-display) !important;
    font-size: 0.78rem !important;
    font-weight: 800 !important;
    letter-spacing: 0.1em !important;
    color: var(--white) !important;
    background: var(--green) !important;
    padding: 0.5rem 1.2rem !important;
    border-radius: var(--radius-sm) !important;
    transition: background var(--transition), box-shadow var(--transition) !important;
}
.btn-nav-cta:hover {
    background: var(--green-light) !important;
    box-shadow: var(--green-glow) !important;
    color: var(--white) !important;
}

/* Hamburger */
.navbar-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}
.navbar-toggle span {
    display: block;
    width: 24px; height: 2px;
    background: var(--green-bright);
    border-radius: 2px;
    transition: transform var(--transition), opacity var(--transition);
}

/* ============================================================
   5. BOTONES
   ============================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    padding: 0.85rem 2rem;
    border-radius: var(--radius-sm);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
    white-space: nowrap;
    line-height: 1;
}

.btn-green {
    background: var(--green);
    color: var(--white);
    border-color: var(--green);
}
.btn-green:hover {
    background: var(--green-light);
    border-color: var(--green-light);
    box-shadow: var(--green-glow);
    color: var(--white);
    transform: translateY(-2px);
}

.btn-outline-white {
    background: transparent;
    color: var(--white);
    border-color: rgba(255,255,255,0.4);
}
.btn-outline-white:hover {
    background: rgba(255,255,255,0.08);
    border-color: var(--white);
    color: var(--white);
    transform: translateY(-2px);
}

.btn-outline-green {
    background: transparent;
    color: var(--green);
    border-color: var(--green);
}
.btn-outline-green:hover {
    background: var(--green-dim);
    box-shadow: var(--green-glow);
    transform: translateY(-2px);
}

.btn-sky {
    background: var(--sky);
    color: var(--white);
    border-color: var(--sky);
}
.btn-sky:hover {
    background: #38bdf8;
    box-shadow: 0 0 20px rgba(14,165,233,0.45);
    color: var(--white);
    transform: translateY(-2px);
}

.btn-sm {
    font-size: 0.72rem;
    padding: 0.55rem 1.2rem;
}

/* ============================================================
   6. TARJETAS
   ============================================================ */
.card {
    background: var(--white);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 16px 48px rgba(8,20,40,0.14);
    border-color: var(--border-light);
}

.card--dark {
    background: var(--navy-light);
    border-color: var(--border-light);
    color: var(--white);
}
.card--dark:hover {
    box-shadow: var(--green-glow);
    border-color: var(--border-mid);
}

/* ============================================================
   7. TAGS / BADGES
   ============================================================ */
.tag {
    display: inline-block;
    font-family: var(--font-display);
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    padding: 0.25rem 0.7rem;
    border-radius: var(--radius-pill);
}
.tag-green {
    background: var(--green-dim);
    color: var(--green);
    border: 1px solid var(--border-light);
}
.tag-sky {
    background: var(--sky-dim);
    color: var(--sky);
    border: 1px solid rgba(14,165,233,0.25);
}
.tag-white {
    background: rgba(255,255,255,0.12);
    color: var(--white);
    border: 1px solid rgba(255,255,255,0.22);
}
.tag-navy {
    background: var(--navy);
    color: var(--green-bright);
    border: 1px solid var(--border-light);
}

/* ============================================================
   8. STAT / NÚMERO DESTACADO
   ============================================================ */
.stat-block {
    text-align: center;
    padding: var(--gap-md);
}
.stat-number {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 900;
    line-height: 1;
    background: var(--grad-green);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.stat-label {
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-top: 0.4rem;
}
.section--dark .stat-label { color: #94a3b8; }

/* ============================================================
   9. FOOTER
   ============================================================ */
.footer {
    background: var(--navy);
    color: var(--white);
    padding: var(--gap-lg) 0 var(--gap-md);
    border-top: 3px solid var(--green);
    position: relative;
    overflow: hidden;
}

/* Franja decorativa superior */
.footer::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--grad-green);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--gap-lg);
    margin-bottom: var(--gap-lg);
}

.footer-brand-name {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 900;
    color: var(--white);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}
.footer-brand-name span {
    background: var(--grad-green);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-desc {
    font-size: 0.88rem;
    color: #64748b;
    line-height: 1.7;
    margin-top: 0.6rem;
}

.footer-col-title {
    font-family: var(--font-display);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--green-bright);
    margin-bottom: 0.85rem;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.footer-links a {
    font-size: 0.88rem;
    color: #64748b;
    transition: color var(--transition);
}
.footer-links a:hover { color: var(--green-bright); }

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.07);
    padding-top: var(--gap-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.5rem;
}
.footer-copy {
    font-size: 0.80rem;
    color: #475569;
}
.footer-copy a { color: var(--green); }
.footer-copy a:hover { color: var(--green-bright); }

/* ============================================================
   10. UTILIDADES
   ============================================================ */
.page-top    { padding-top: var(--nav-height); }
.text-green  { color: var(--green); }
.text-sky    { color: var(--sky); }
.text-muted  { color: var(--text-muted); }
.text-center { text-align: center; }
.text-white  { color: var(--white); }

.divider {
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-card), transparent);
    margin: var(--gap-lg) 0;
}

/* Franja de acento izquierda */
.accent-left {
    border-left: 4px solid var(--green);
    padding-left: 1rem;
}

/* Grid helpers */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--gap-md); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--gap-md); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--gap-md); }
.grid-auto { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: var(--gap-md); }

/* ============================================================
   11. ANIMACIONES
   ============================================================ */
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(28px); }
    to   { opacity: 1; transform: translateY(0); }
}
@keyframes pulse-green {
    0%, 100% { box-shadow: 0 0 0 0 rgba(34,197,94,0.4); }
    50%       { box-shadow: 0 0 0 10px rgba(34,197,94,0); }
}
@keyframes gradientShift {
    0%   { background-position: 0% 50%; }
    50%  { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.animate-up {
    animation: fadeUp 0.6s cubic-bezier(0.4,0,0.2,1) both;
}
.delay-1 { animation-delay: 0.10s; }
.delay-2 { animation-delay: 0.20s; }
.delay-3 { animation-delay: 0.30s; }
.delay-4 { animation-delay: 0.40s; }
.delay-5 { animation-delay: 0.55s; }

/* ============================================================
   12. RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--gap-md); }
}

@media (max-width: 768px) {
    .navbar-nav {
        display: none;
        position: fixed;
        top: var(--nav-height); left: 0; right: 0;
        background: rgba(8,20,40,0.99);
        flex-direction: column;
        align-items: flex-start;
        padding: var(--gap-md);
        gap: 0.25rem;
        border-bottom: 1px solid var(--border-light);
        backdrop-filter: blur(14px);
    }
    .navbar-nav.open { display: flex; }
    .navbar-nav a { font-size: 1.1rem; padding: 0.7rem 0.5rem; width: 100%; }
    .navbar-toggle { display: flex; }

    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
    :root { --nav-height: 62px; }
    .container { padding: 0 1rem; }
    .section { padding: var(--gap-lg) 0; }
    .btn { padding: 0.75rem 1.5rem; }
}