/* ==========================================================================
   PROJECT PORTFOLIO - PURE HTML & CSS THEMEFOREST DESIGN SYSTEM
   Zero JavaScript Dependency - Pure CSS Animations, Filters & Modals
   Theme: Land Surveying, Infrastructure & Engineering Corporate
   Primary Color: #F4A825 (Survey Gold / Orange)
   Dark Tone: #1E1E1E
   ========================================================================== */

/* --- Custom CSS Variables --- */
:root {
    --primary-color: #F4A825;
    --primary-gradient: linear-gradient(135deg, #F4A825 0%, #E09010 100%);
    --primary-light: rgba(244, 168, 37, 0.12);
    --primary-glow: rgba(244, 168, 37, 0.35);

    --dark-color: #1E1E1E;
    --dark-surface: #121212;
    --text-dark: #1E293B;
    --text-muted: #64748B;
    --text-light: #94A3B8;

    --bg-light: #F8FAFC;
    --bg-card: #FFFFFF;
    --border-color: #E2E8F0;
    --border-hover: #CBD5E1;

    /* --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; */
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.06), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 20px 35px -10px rgba(0, 0, 0, 0.15), 0 10px 15px -5px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 25px 45px -12px rgba(244, 168, 37, 0.28);

    --radius-sm: 8px;
    --radius-md: 30px;
    --radius-lg: 16px;
    --radius-full: 9999px;

    --transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: var(--font-body);
    background-color: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.projects-section {
    padding: 90px 20px;
    background: radial-gradient(circle at 50% 0%, rgba(244, 168, 37, 0.06) 0%, rgba(248, 250, 252, 0) 70%), var(--bg-light);
    position: relative;
    overflow: hidden;
}

.container {
    max-width: 1320px;
    margin: 0 auto;
    width: 100%;
}

/* --- Section Header --- */
.section-header {
    text-align: center;
    max-width: 750px;
    margin: 0 auto 50px auto;
    animation: fadeInUp 0.8s ease forwards;
}

.section-header .subtitle {
    display: inline-block;
    font-family: var(--font-heading);
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 12px;
    padding: 6px 16px;
    background-color: var(--primary-light);
    border-radius: var(--radius-full);
    border: 1px solid rgba(244, 168, 37, 0.25);
}

.section-header .title {
    font-family: var(--font-heading);
    font-size: 2.75rem;
    font-weight: 800;
    color: var(--dark-color);
    line-height: 1.2;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.section-header .section-description {
    font-size: 1.1rem;
    color: var(--text-muted);
    font-weight: 400;
    line-height: 1.7;
}

/* --- Statistics Row --- */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 55px;
    padding: 28px 32px;
    background: rgba(255, 255, 255, 0.88);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    animation: fadeInUp 0.9s ease forwards;
}

.stat-card {
    display: flex;
    align-items: center;
    gap: 18px;
    padding: 10px;
    border-right: 1px solid var(--border-color);
    transition: var(--transition);
}

.stat-card:last-child {
    border-right: none;
}

.stat-card:hover {
    transform: translateY(-3px);
}

.stat-icon {
    width: 56px;
    height: 56px;
    min-width: 56px;
    border-radius: var(--radius-md);
    background: var(--primary-gradient);
    color: #FFFFFF;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    box-shadow: 0 8px 16px var(--primary-glow);
}

.stat-number {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 800;
    color: var(--dark-color);
    line-height: 1.1;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-top: 4px;
}

/* --- Pure CSS Radio Inputs (Hidden) --- */
.filter-radio {
    display: none;
}

/* --- Category Filter Navigation Labels --- */
.filter-wrapper {
    display: flex;
    justify-content: center;
    margin-bottom: 50px;
    animation: fadeInUp 1s ease forwards;
}

.filter-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    padding: 8px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-full);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.filter-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 24px;
    border: radius 4px;
    border: 1px solid transparent;
    background: transparent;
    color: var(--text-dark);
    font-family: var(--font-body);
    font-size: 0.925rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    user-select: none;
    white-space: nowrap;
}

.filter-btn i {
    font-size: 0.95rem;
    color: var(--text-muted);
    transition: var(--transition);
}

.filter-btn:hover {
    color: var(--primary-color);
    background: var(--primary-light);
}

.filter-btn:hover i {
    color: var(--primary-color);
}

/* Radio Button Active State Highlights (Pure CSS) */
#filter-all:checked~.filter-wrapper .filter-label-all,
#filter-land:checked~.filter-wrapper .filter-label-land,
#filter-layout:checked~.filter-wrapper .filter-label-layout,
#filter-infra:checked~.filter-wrapper .filter-label-infra,
#filter-drone:checked~.filter-wrapper .filter-label-drone {
    background: var(--primary-gradient);
    color: #FFFFFF;
    box-shadow: 0 8px 20px var(--primary-glow);
}

#filter-all:checked~.filter-wrapper .filter-label-all i,
#filter-land:checked~.filter-wrapper .filter-label-land i,
#filter-layout:checked~.filter-wrapper .filter-label-layout i,
#filter-infra:checked~.filter-wrapper .filter-label-infra i,
#filter-drone:checked~.filter-wrapper .filter-label-drone i {
    color: #FFFFFF;
}

/* --- Pure CSS Filter Logic --- */
#filter-land:checked~.projects-grid .project-card {
    display: none;
}

#filter-land:checked~.projects-grid .project-card.category-land {
    display: flex;
    animation: fadeInCard 0.4s ease forwards;
}

#filter-layout:checked~.projects-grid .project-card {
    display: none;
}

#filter-layout:checked~.projects-grid .project-card.category-layout {
    display: flex;
    animation: fadeInCard 0.4s ease forwards;
}

#filter-infra:checked~.projects-grid .project-card {
    display: none;
}

#filter-infra:checked~.projects-grid .project-card.category-infra {
    display: flex;
    animation: fadeInCard 0.4s ease forwards;
}

#filter-drone:checked~.projects-grid .project-card {
    display: none;
}

#filter-drone:checked~.projects-grid .project-card.category-drone {
    display: flex;
    animation: fadeInCard 0.4s ease forwards;
}

/* --- Projects Grid --- */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 28px;
}

/* --- Premium Project Cards --- */
.project-card {
    background: var(--bg-card);
    border-radius: 4px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.06);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    position: relative;
    animation: fadeInCard 0.6s ease forwards;
}

.project-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 25px rgba(0,0,0,0.1);
}

/* Card Media & Image Zoom */
.card-media {
    position: relative;
    width: 100%;
    height: 250px;
    overflow: hidden;
    background-color: var(--dark-color);
}

.card-media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center 25%;
    transition: transform 0.6s cubic-bezier(0.25, 1, 0.5, 1);
}

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

/* Dark Gradient Hover Overlay - Hidden */
.card-overlay {
    display: none;
}

.overlay-badge { display: none; }
.overlay-title { display: none; }
.overlay-action { display: none; }

/* Card Body */
.card-body {
    padding: 20px 24px;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
}

.card-text {
    display: flex;
    flex-direction: column;
    gap: 6px;
    flex: 1;
    padding-right: 15px;
}

.card-title {
    font-family: 'Playfair Display', serif;
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--dark-color);
    margin: 0;
    line-height: 1.25;
}

.card-category {
    display: inline-block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--primary-color);
    margin: 0;
}

.card-category i {
    display: none;
}

.card-short-desc {
    display: none;
}

/* Metadata Placeholders */
.card-meta {
    display: none;
}

.meta-item { display: none; }

/* Premium Card Action Button */
.card-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 24px;
    border-radius: 4px;
    background: var(--primary-color);
    color: #FFFFFF;
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    flex-shrink: 0;
}

.card-btn:hover {
    background: #d88a10;
    color: #FFFFFF;
}

.card-btn span {
    display: none;
}

.card-btn i {
    display: none;
}

.card-btn::after {
    content: "Click";
}

/* --- Pure CSS Modals (Using :target pseudo-class) --- */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.78);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.modal-overlay:target {
    opacity: 1;
    visibility: visible;
}

.modal-container {
    background: var(--bg-card);
    width: 100%;
    max-width: 980px;
    max-height: 90vh;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow-y: auto;
    transform: scale(0.92);
    transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.modal-overlay:target .modal-container {
    transform: scale(1);
}

.modal-close-btn {
    position: absolute;
    top: 18px;
    right: 18px;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: #FFFFFF;
    border: 1px solid var(--border-color);
    color: var(--dark-color);
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: var(--transition);
    z-index: 10;
    box-shadow: var(--shadow-md);
}

.modal-close-btn:hover {
    background: var(--primary-color);
    color: #FFFFFF;
    border-color: var(--primary-color);
    transform: rotate(90deg);
}

.modal-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
}

/* Gallery Section in Modal */
.modal-gallery-section {
    background: #0F172A;
    padding: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-hero-wrapper {
    position: relative;
    width: 100%;
    height: 380px;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    background: #000;
}

.modal-hero-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Modal Info Section */
.modal-info-section {
    padding: 40px 36px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.modal-category-badge {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--primary-color);
    background: var(--primary-light);
    padding: 6px 14px;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 12px;
    border: 1px solid rgba(244, 168, 37, 0.2);
}

.modal-title {
    font-family: var(--font-heading);
    font-size: 1.85rem;
    font-weight: 800;
    color: var(--dark-color);
    line-height: 1.25;
    margin-bottom: 24px;
}

.modal-meta-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    margin-bottom: 24px;
}

.meta-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: var(--bg-light);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.meta-card-icon {
    width: 38px;
    height: 38px;
    min-width: 38px;
    border-radius: var(--radius-sm);
    background: var(--primary-light);
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
}

.meta-card-content {
    display: flex;
    flex-direction: column;
}

.meta-label {
    font-size: 0.725rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
}

.meta-value {
    font-size: 0.85rem;
    color: var(--dark-color);
    font-weight: 700;
}

.modal-description-box {
    margin-bottom: 10px;
}

.box-heading {
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 700;
    color: var(--dark-color);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.box-heading i {
    color: var(--primary-color);
}

.modal-description-box p {
    font-size: 0.925rem;
    color: var(--text-muted);
    line-height: 1.6;
}

/* --- Keyframe Animations --- */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInCard {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.96);
    }

    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* --- Responsive Grid Rules --- */

/* Desktop (Default): 3 Columns */
@media (min-width: 1200px) {
    .projects-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Laptop Grid: 3 Columns */
@media (max-width: 1199px) and (min-width: 992px) {
    .projects-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .stats-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 16px;
        padding: 24px;
    }
}

/* Tablet Grid: 2 Columns */
@media (max-width: 991px) and (min-width: 678px) {
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

    .section-header .title {
        font-size: 2.25rem;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

    .stat-card {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding-bottom: 16px;
    }

    .stat-card:nth-child(3),
    .stat-card:nth-child(4) {
        border-bottom: none;
    }

    .modal-content {
        grid-template-columns: 1fr;
    }

    .modal-hero-wrapper {
        height: 280px;
    }
}

/* Mobile Grid: 1 Column */
@media (max-width: 677px) {
    .projects-section {
        padding: 60px 16px;
    }

    .section-header .title {
        font-size: 1.85rem;
    }

    .stats-grid {
        grid-template-columns: 1fr;
        gap: 18px;
        padding: 20px;
    }

    .stat-card {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding-bottom: 14px;
    }

    .stat-card:last-child {
        border-bottom: none;
    }

    .filter-container {
        border-radius: var(--radius-lg);
        width: 100%;
    }

    .filter-btn {
        flex: 1 1 auto;
        justify-content: center;
        padding: 10px 16px;
        font-size: 0.85rem;
    }

    .projects-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .modal-info-section {
        padding: 24px 20px;
    }

    .modal-meta-grid {
        grid-template-columns: 1fr;
    }

    .modal-title {
        font-size: 1.4rem;
    }
}

@media (max-width: 700px) {
    .modal-content {
        display: flex;
        flex-direction: column-reverse;
    }
}