/* ==========================================================================
   Kalpana Mistry Portfolio Design System (CSS)
   Design Concept: Architectural precision, technical minimal grids, dark mode
   ========================================================================== */

/* --- Custom Properties / Design Tokens --- */
:root {
    /* Color Palette — Areia (Sand) warm architectural tones */
    --color-bg: #D3C7AD;                     /* Areia sand background */
    --color-panel: #C9BDA3;                  /* Slightly deeper sand panel */
    --color-panel-border: rgba(43, 55, 74, 0.12); /* Subtle Azul division line */
    --color-text-main: #2B374A;              /* Azul deep blue text */
    --color-text-muted: rgba(43, 55, 74, 0.6);   /* Azul muted auxiliary text */
    --color-accent: #754437;                 /* Terra Queimada burnt earth accent */
    --color-accent-hover: #8B5545;           /* Lighter burnt earth hover */
    --color-grid-overlay: rgba(43, 55, 74, 0.03);
    
    /* Typography */
    --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: 'Space Mono', monospace;
    
    /* Spacing & Layout */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;
    --max-width: 1400px;
    --header-height: 80px;
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    
    /* Animations */
    --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-fast: all 0.2s ease;
}

/* --- Document & Global Resets --- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    background-color: var(--color-bg);
    color: var(--color-text-main);
    font-family: var(--font-sans);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
    text-decoration: none;
}

body {
    position: relative;
    overflow-x: hidden;
    min-height: 100vh;
}

/* Technical Monospace Font Helper */
.font-mono {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-accent);
}

/* --- Background Gridlines (Architectural overlay) --- */
.grid-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    background-image: 
        linear-gradient(to right, var(--color-grid-overlay) 1px, transparent 1px),
        linear-gradient(to bottom, var(--color-grid-overlay) 1px, transparent 1px);
    background-size: 80px 80px;
}

/* --- Layout Container & Section Base --- */
main {
    position: relative;
    z-index: 1;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

section {
    padding: var(--spacing-lg) 0;
    border-bottom: 1px solid var(--color-panel-border);
    scroll-margin-top: calc(var(--header-height) + 20px);
}

/* --- Header / Navigation --- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: var(--header-height);
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    background-color: rgba(211, 199, 173, 0.9); /* Glassmorphism background */
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-panel-border);
    transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.6s ease;
}

.site-header.header-hidden {
    transform: translateY(-100%);
    opacity: 0;
}

.header-trigger {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 35px; /* invisible hover zone at top of viewport */
    z-index: 99;
    pointer-events: auto;
}

.header-trigger:hover + .site-header,
.site-header:hover {
    transform: translateY(0) !important;
    opacity: 1 !important;
}

.logo {
    display: flex;
    flex-direction: column;
    opacity: 0;
    transition: opacity 0.5s ease;
}

.logo.logo-visible {
    opacity: 1;
}

.logo-name {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    color: var(--color-text-main);
}

.logo-title {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.2em;
    color: var(--color-accent);
}

.nav-menu ul {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.nav-link {
    color: var(--color-text-muted);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
    color: var(--color-text-main);
}

/* Mobile Nav Toggle Menu Button */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    gap: 6px;
}

.nav-toggle .bar {
    width: 24px;
    height: 2px;
    background-color: var(--color-text-main);
    transition: var(--transition-fast);
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-md);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: var(--border-radius-sm);
    transition: var(--transition-smooth);
    cursor: pointer;
}

.btn-primary {
    background-color: var(--color-accent);
    color: var(--color-bg);
    border: 1px solid var(--color-accent);
}

.btn-primary:hover {
    background-color: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-text-main);
    border: 1px solid var(--color-panel-border);
}

.btn-secondary:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

/* --- Hero Section --- */
.hero-section {
    height: calc(100vh - var(--header-height));
    min-height: calc(100vh - var(--header-height));
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    width: 100%;
    padding: 0;
}

/* Background Slideshow */
.hero-slideshow {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    overflow: hidden;
}

.hero-slideshow-track {
    display: flex;
    width: 1000%; /* 10 slides */
    height: 100%;
    transition: transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: transform;
}

.hero-slide {
    width: 10%;
    height: 100%;
    background-size: cover;
    background-position: center;
    flex-shrink: 0;
}

.hero-slideshow-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        to bottom,
        rgba(43, 55, 74, 0.2) 0%,
        rgba(43, 55, 74, 0.1) 70%,
        rgba(43, 55, 74, 0.35) 100%
    );
    pointer-events: none;
    z-index: 1;
}

/* Manual Navigation Controls */
.hero-slideshow-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(211, 199, 173, 0.7);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid rgba(43, 55, 74, 0.15);
    color: var(--color-text-main);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 2;
    font-size: 1.2rem;
    transition: var(--transition-smooth);
}

.hero-slideshow-arrow:hover {
    background: var(--color-text-main);
    color: var(--color-bg);
    border-color: var(--color-text-main);
}

.prev-arrow {
    left: clamp(16px, 3vw, 48px);
}

.next-arrow {
    right: clamp(16px, 3vw, 48px);
}

.hero-slideshow-dots {
    position: absolute;
    bottom: 24px;
    right: clamp(24px, 4vw, 64px);
    display: flex;
    gap: 8px;
    z-index: 2;
}

.hero-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(43, 55, 74, 0.25);
    border: none;
    cursor: pointer;
    transition: var(--transition-smooth);
    padding: 0;
}

.hero-dot.active {
    background: var(--color-text-main);
    transform: scale(1.4);
}

@media (max-width: 768px) {
    .hero-slideshow-arrow {
        display: none;
    }
    .hero-slideshow-dots {
        right: 50%;
        transform: translateX(50%);
    }
}

/* Floating Glassmorphism Hero Content Panel */
.hero-content {
    max-width: calc(720px + (50vw - 50%));
    width: auto;
    position: relative;
    z-index: 2;
    margin-left: calc(50% - 50vw);
    padding: clamp(24px, 5vw, 48px) var(--spacing-md) clamp(24px, 5vw, 48px) calc(50vw - 50% + var(--spacing-md));
    background: rgba(211, 199, 173, 0.60); /* 60% opacity as requested */
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(43, 55, 74, 0.15);
    border-left: none;
    border-radius: 0 var(--border-radius-md) var(--border-radius-md) 0;
    box-shadow: 0 20px 50px rgba(43, 55, 74, 0.12);
}

.hero-tagline {
    display: block;
    margin-bottom: var(--spacing-xs);
}

.hero-title {
    font-size: clamp(2.2rem, 4.5vw, 4rem);
    font-weight: 300;
    line-height: 1.1;
    margin-bottom: var(--spacing-xs);
    letter-spacing: -0.02em;
}

.hero-lead {
    font-size: clamp(1rem, 1.8vw, 1.25rem);
    color: var(--color-text-muted);
    font-weight: 300;
    margin-bottom: var(--spacing-md);
    max-width: 650px;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* --- Work Section --- */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-panel-border);
    padding-bottom: var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.section-title-wrap {
    display: flex;
    align-items: baseline;
    gap: var(--spacing-xs);
}

.section-num {
    font-weight: bold;
}

.section-title {
    font-size: 2rem;
    font-weight: 500;
    letter-spacing: -0.01em;
}

.filter-controls {
    display: flex;
    gap: var(--spacing-xs);
}

.filter-btn {
    background: none;
    border: 1px solid transparent;
    color: var(--color-text-muted);
    padding: var(--spacing-xs) var(--spacing-sm);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    cursor: pointer;
    border-radius: var(--border-radius-sm);
    transition: var(--transition-fast);
}

.filter-btn.active, .filter-btn:hover {
    color: var(--color-accent);
    border-color: var(--color-accent);
    background-color: rgba(194, 151, 112, 0.05);
}

/* --- Project Grid / Cards --- */
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-md);
}

.project-card {
    background-color: var(--color-panel);
    border: 1px solid var(--color-panel-border);
    border-radius: var(--border-radius-md);
    overflow: hidden;
    transition: var(--transition-smooth);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-8px);
    border-color: var(--color-accent);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.3);
}

.project-media {
    position: relative;
    width: 100%;
    padding-top: 56.25%; /* 16:9 Aspect Ratio */
    overflow: hidden;
}

.project-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-smooth);
}

.project-card:hover .project-placeholder {
    transform: scale(1.05);
}

/* Stylized placeholder gradients representing architectural materialities */
.bg-gradient-1 { background: linear-gradient(135deg, #C9BDA3, #B8A88E); } /* Sand tone */
.bg-gradient-2 { background: linear-gradient(135deg, #2B374A, #3D4F66); } /* Azul tone */
.bg-gradient-3 { background: linear-gradient(135deg, #6B6751, #7D7963); } /* Verde Opaco tone */
.bg-gradient-4 { background: linear-gradient(135deg, #754437, #8B5545); } /* Terra Queimada tone */
.bg-gradient-5 { background: linear-gradient(135deg, #4A5568, #5A6578); } /* Slate tone */

.placeholder-icon {
    font-size: 1.5rem;
    font-weight: 700;
    color: rgba(43, 55, 74, 0.15);
}

.project-info {
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.project-title {
    font-size: 1.35rem;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-main);
}

.project-meta {
    font-size: 0.75rem;
    margin-bottom: var(--spacing-sm);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
}

.project-location-row {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 500;
    letter-spacing: 0.05em;
    color: var(--color-accent);
}

.project-type {
    color: var(--color-accent);
}

.project-category {
    color: var(--color-accent);
    text-align: left;
}

.separator {
    opacity: 0.5;
}

.project-desc {
    font-size: 0.95rem;
    color: var(--color-accent);
    font-weight: 300;
    margin-bottom: var(--spacing-md);
    flex-grow: 1;
}

.project-link {
    font-size: 0.8rem;
    color: var(--color-text-main);
    transition: var(--transition-fast);
}

.project-card:hover .project-link {
    color: var(--color-accent);
    padding-left: var(--spacing-xs);
}

/* --- About Section --- */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-lg);
}

.about-header-wrap {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-xs);
}

.profile-image-wrap {
    position: relative;       /* stacking context for the absolute overlay */
    margin-top: var(--spacing-md);
    width: 100%;
    max-width: 280px;
    border-radius: var(--border-radius-md);
    overflow: hidden;
    border: 1px solid var(--color-panel-border);
    background-color: var(--color-panel);
    aspect-ratio: 4 / 5;     /* standard ID photo proportions */
    cursor: pointer;
}

.profile-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1),
                filter 0.4s ease;
    will-change: transform, filter;
}

/* Dark scrim overlay — hidden by default, dims image on hover */
.profile-cv-overlay {
    position: absolute;
    inset: 0;                 /* top/right/bottom/left: 0 */
    background: rgba(43, 55, 74, 0.55);  /* Azul deep blue tint */
    backdrop-filter: blur(1px);
    -webkit-backdrop-filter: blur(1px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;     /* never intercept clicks while invisible */
    transition: opacity 0.35s ease, visibility 0.35s ease;
}

/* CV button — centered inside the overlay */
.profile-cv-btn {
    display: inline-block;
    padding: 0.55rem 1.1rem;
    font-size: 0.72rem;
    letter-spacing: 0.18em;
    color: var(--color-bg);           /* sand text on dark overlay */
    text-decoration: none;
    border: 1px solid rgba(211, 199, 173, 0.65); /* faint sand border */
    border-radius: var(--border-radius-sm);
    background: rgba(43, 55, 74, 0.3);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    transition: background 0.25s ease, border-color 0.25s ease,
                color 0.25s ease, transform 0.25s ease;
    transform: translateY(6px);       /* subtle lift-in on reveal */
    white-space: nowrap;
}

/* Hover states — trigger on the wrapper */
.profile-image-wrap:hover .profile-cv-overlay {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;     /* re-enable clicks so the CV link works */
}

.profile-image-wrap:hover .profile-image {
    transform: scale(1.04);
}

.profile-image-wrap:hover .profile-cv-btn {
    transform: translateY(0);         /* settle into position */
}

/* CV button own hover — deepens on direct mouse-over */
.profile-cv-btn:hover {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: #fff;
}

.about-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.about-body-lead {
    font-size: 1.5rem;
    font-weight: 300;
    line-height: 1.4;
    color: var(--color-text-main);
}

.about-body {
    font-size: 1.05rem;
    color: var(--color-text-muted);
    font-weight: 300;
}

.technical-stats {
    display: flex;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-md);
    border-top: 1px solid var(--color-panel-border);
    padding-top: var(--spacing-md);
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-item.stat-link {
    text-decoration: none;
    color: inherit;
    cursor: pointer;
    transition: var(--transition-fast);
}

.stat-item.stat-link:hover .stat-num {
    color: var(--color-accent-hover);
}

.stat-item.stat-link:hover .stat-label {
    color: var(--color-accent);
}

.stat-num {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-accent);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* --- Contact Section --- */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.contact-lead {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    font-weight: 300;
    margin-bottom: var(--spacing-md);
}

.contact-links p {
    margin-bottom: var(--spacing-xs);
}

.contact-links a {
    color: var(--color-text-main);
    text-decoration: none;
    transition: var(--transition-fast);
}

.contact-links a:hover {
    color: var(--color-accent);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-group label {
    font-size: 0.75rem;
}

.form-group input, .form-group textarea {
    background-color: var(--color-panel);
    border: 1px solid var(--color-panel-border);
    color: var(--color-text-main);
    padding: var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    font-family: var(--font-sans);
    font-size: 0.95rem;
    transition: var(--transition-fast);
}

.form-group input:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    background-color: #DACEBC;
}

/* --- Footer --- */
.site-footer {
    padding: var(--spacing-md) 0;
    border-top: 1px solid var(--color-panel-border);
    margin-top: var(--spacing-lg);
}

.footer-wrap {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--color-text-muted);
    font-size: 0.75rem;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* --- Responsive Breakpoints --- */
@media (max-width: 992px) {
    .about-grid, .contact-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    .hero-section {
        padding: var(--spacing-lg) 0;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none; /* Mobile menu support can be handled dynamically in JS */
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* ==========================================================================
   Intro Loading Screen (BIG-inspired)
   ========================================================================== */

.intro-loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-color: var(--color-bg);
    z-index: 99999; /* Higher than header and all layers */
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 1.2s ease-in-out;
    pointer-events: all;
}

/* Background fades away by becoming transparent */
.intro-loader.loader-finished {
    background-color: transparent;
    pointer-events: none;
}

.loader-content-wrap {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    max-width: 600px;
    width: 90%;
    gap: 24px;
}

.loader-logo-wrap {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
    /* Move to corner over 1.2s using ease-in-out when triggered */
    transition: transform 1.2s ease-in-out, opacity 0.4s ease;
    will-change: transform, opacity;
}

.loader-logo-name {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    line-height: 1.6;
    color: var(--color-accent);
    animation: nameColorMorph 6.0s ease-in-out forwards;
}

.loader-logo-title {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.2em;
    line-height: 1.6;
    color: var(--color-text-muted);
    animation: titleColorMorph 6.0s ease-in-out forwards;
}

/* Translate from center to exact header coordinates */
.loader-logo-wrap.move-to-corner {
    transform: translate(var(--logo-dest-x, 0), var(--logo-dest-y, 0));
}

.loader-logo-wrap.fade-out {
    opacity: 0;
}

/* Loader progress bar and percentage styles */
.loader-progress-wrap {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 16px;
    transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: opacity, transform;
}

.loader-progress-bar {
    flex-grow: 1;
    height: 2px;
    background: rgba(43, 55, 74, 0.1);
    position: relative;
    overflow: hidden;
}

.loader-progress-fill {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 0%;
    background: var(--color-accent);
    transition: width 0.1s linear;
}

.loader-progress-text {
    font-size: 0.8rem;
    color: var(--color-text-main);
    min-width: 45px;
    text-align: right;
}

.loader-statement {
    font-family: var(--font-sans);
    font-size: 1.1rem;
    font-weight: 300;
    line-height: 1.6;
    color: var(--color-text-muted);
    font-style: italic;
    transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: opacity, transform;
    margin-top: 8px;
}

/* Class to fade out the extra content */
.loader-content-wrap.fade-out-content .loader-progress-wrap {
    opacity: 0;
    transform: translateY(12px);
}

.loader-content-wrap.fade-out-content .loader-statement {
    opacity: 0;
    transform: translateY(12px);
}

/* Color morph keyframes running over exactly 6 seconds */
@keyframes nameColorMorph {
    0% {
        color: #754437;
    }
    100% {
        color: #2B374A;
    }
}

@keyframes titleColorMorph {
    0% {
        color: rgba(43, 55, 74, 0.5);
    }
    100% {
        color: #754437;
    }
}

/* ==========================================================================
   Project Cards Image Thumbnails
   ========================================================================== */
.project-thumbnail {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-smooth);
}

.project-card:hover .project-thumbnail {
    transform: scale(1.05);
}