/* 
  Supralux Responsive Design System
  Mobile-First Approach
  Breakpoints: 768px (Tablet), 1024px (Desktop)
*/

/* ==========================================================================
   MOBILE DEFAULT (< 768px)
   ========================================================================== */

/* Layout & Grid */
.container {
    width: 100%;
    max-width: none;
    padding: 0 var(--spacing-md);
}

.grid {
    grid-template-columns: 1fr !important;
    gap: var(--spacing-lg);
}

section {
    padding: var(--spacing-2xl) 0;
}

/* Typography Fluidity */
:root {
    --fs-h1: clamp(2.5rem, 10vw, 3.5rem);
    --fs-h2: clamp(1.75rem, 6vw, 2.5rem);
    --fs-h3: clamp(1.25rem, 4vw, 1.75rem);
}

/* Navigation - Hamburger Menu */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 0;
        left: -100%;
        width: 100%;
        height: 100vh;
        background: var(--primary-dark);
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: left 0.4s cubic-bezier(0.77, 0, 0.175, 1);
        z-index: 999;
        gap: var(--spacing-xl);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-links {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-xl);
    }

    .nav-links a {
        font-size: 1.5rem;
        font-weight: 600;
    }

    .hamburger {
        display: block !important;
        background: none;
        border: none;
        color: var(--text-light);
        cursor: pointer;
        z-index: 1001;
        width: 48px;
        height: 48px;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .nav-cta {
        display: none;
        /* Hide main CTA in header on mobile if needed, or move to menu */
    }
}

/* Touch Targets */
button,
.btn,
.nav-links a,
.faq-question {
    min-height: 48px;
    display: flex;
    align-items: center;
}

.service-card,
.project-card,
.benefit-card {
    padding: var(--spacing-lg);
}

/* Animations on Mobile */
.circuit-node {
    animation-duration: 6s !important;
    /* Slower pulse */
}

/* ==========================================================================
   TABLET (768px - 1024px)
   ========================================================================== */
@media (min-width: 768px) {
    .container {
        padding: 0 var(--spacing-xl);
    }

    .grid-cols-2-tablet {
        grid-template-columns: repeat(2, 1fr) !important;
    }

    section {
        padding: var(--spacing-3xl) 0;
    }

    .hamburger {
        display: none !important;
    }

    .nav-menu {
        position: static;
        height: auto;
        width: auto;
        background: none;
        flex-direction: row;
        display: flex !important;
        left: 0;
    }

    .nav-links {
        flex-direction: row;
        gap: var(--spacing-xl);
    }

    .nav-links a {
        font-size: var(--fs-small);
    }
}

/* ==========================================================================
   DESKTOP (1024px+)
   ========================================================================== */
@media (min-width: 1024px) {
    .container {
        max-width: 1200px;
        margin: 0 auto;
    }

    .grid-cols-3 {
        grid-template-columns: repeat(3, 1fr) !important;
    }

    .grid-cols-4 {
        grid-template-columns: repeat(4, 1fr) !important;
    }

    /* Full intensity animations */
}

/* ==========================================================================
   ACCESSIBILITY & UTILITIES
   ========================================================================== */

/* Focus visible only for keyboard navigation */
:focus-visible {
    outline: 3px solid var(--accent-cyan);
    outline-offset: 2px;
}

/* Skip to main content link */
.skip-to-main {
    position: absolute;
    top: -100px;
    left: 0;
    background: var(--accent-cyan);
    color: var(--primary-dark);
    padding: var(--spacing-sm) var(--spacing-md);
    z-index: 2000;
    transition: top 0.3s ease;
    font-weight: bold;
    border-radius: 0 0 var(--radius-sm) 0;
}

.skip-to-main:focus {
    top: 0;
}

/* Performance: Aspect Ratios */
img,
video {
    aspect-ratio: 16 / 9;
    width: 100%;
    height: auto;
    object-fit: cover;
}

/* Avoid layout shift for icons */
.lucide {
    width: 24px;
    height: 24px;
    display: inline-block;
}