/* ================================
   Variables CSS
   ================================ */
:root {
    /* Dark Theme */
    --color-primary: #818cf8;
    --color-primary-dark: #6366f1;
    --color-secondary: #a78bfa;
    --color-accent: #c084fc;
    --color-text: #e2e8f0;
    --color-text-light: #94a3b8;
    --color-bg: #0f172a;
    --color-bg-alt: #1e293b;
    --color-border: #334155;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.6);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --border-radius: 12px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    overflow-x: hidden;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
}

/* ================================
   Container
   ================================ */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ================================
   Navigation
   ================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.navbar.hidden {
    transform: translateY(-100%);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 20px;
}

.brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    transition: var(--transition);
}

.nav-links a:hover::after {
    width: 100%;
}

.social-icons {
    display: flex;
    gap: 1rem;
}

.social-icons a {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--color-bg-alt);
    transition: var(--transition);
}

.social-icons a:hover {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    transform: translateY(-3px);
}

.social-icons a:hover svg {
    fill: white;
}

.social-icons svg {
    fill: var(--color-text);
    transition: var(--transition);
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 10px;
}

.mobile-toggle span {
    width: 25px;
    height: 2px;
    background: var(--color-text);
    transition: var(--transition);
}

/* ================================
   Hero Section
   ================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    overflow: hidden;
    padding-top: 80px;
}

.hero-content {
    text-align: center;
    color: white;
    z-index: 2;
    position: relative;
}

.hero-title {
    font-size: clamp(3rem, 8vw, 5rem);
    font-weight: 800;
    margin-bottom: 1rem;
    animation: fadeInUp 0.8s ease-out;
}

.hero-subtitle {
    font-size: clamp(1.5rem, 3vw, 2rem);
    margin-bottom: 1rem;
    opacity: 0.9;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-description {
    font-size: clamp(1rem, 2vw, 1.2rem);
    margin-bottom: 2rem;
    opacity: 0.8;
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

.hero-animation {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: var(--color-primary);
    border-radius: 50%;
    opacity: 0.2;
    animation: float 10s infinite ease-in-out;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(50px, -50px); }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ================================
   Buttons
   ================================ */
.btn-primary {
    display: inline-block;
    padding: 1rem 2rem;
    background: var(--color-primary);
    color: white;
    font-weight: 600;
    border-radius: var(--border-radius);
    transition: var(--transition);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    display: inline-block;
    padding: 1rem 2rem;
    background: var(--color-bg-alt);
    color: var(--color-text);
    font-weight: 600;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

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

/* ================================
   Filter Section
   ================================ */
.filters {
    padding: 6rem 0 2rem;
    background: var(--color-bg-alt);
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    text-align: center;
    margin-bottom: 2rem;
    color: white;
}

.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
}

.filter-btn {
    padding: 0.75rem 1.5rem;
    background: var(--color-bg-alt);
    border-radius: var(--border-radius);
    font-weight: 500;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.filter-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.filter-btn.active {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    box-shadow: var(--shadow-md);
}

/* ================================
   Projects Grid
   ================================ */
.projects-section {
    padding: 4rem 0;
    background: var(--color-bg-alt);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.project-card {
    background: var(--color-bg-alt);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    opacity: 0;
    transform: translateY(20px);
}

.project-card.fade-in {
    animation: fadeInUp 0.5s ease-out forwards;
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.project-image {
    position: relative;
    padding-top: 60%;
    overflow: hidden;
    background: var(--color-bg-alt);
}

.project-image img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.project-card:hover .project-image img {
    transform: scale(1.1);
}

.project-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.9), rgba(118, 75, 162, 0.9));
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.btn-view {
    padding: 0.75rem 1.5rem;
    background: var(--color-primary);
    color: white;
    font-weight: 600;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.btn-view:hover {
    transform: scale(1.05);
}

.project-info {
    padding: 1.5rem;
}

.project-title {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--color-text);
}

.project-description {
    color: var(--color-text-light);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.tag {
    padding: 0.25rem 0.75rem;
    background: var(--color-bg-alt);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--color-text-light);
}

.project-actions {
    display: flex;
    gap: 0.75rem;
}

.btn-icon {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-alt);
    border-radius: 50%;
    transition: var(--transition);
}

.btn-icon:hover {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    transform: translateY(-2px);
}

.btn-icon:hover svg {
    fill: white;
    stroke: white;
}

.btn-icon svg {
    fill: none;
    stroke: var(--color-text);
    stroke-width: 2;
    transition: var(--transition);
}

/* ================================
   Modal
   ================================ */
.modal {
    position: fixed;
    inset: 0;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
}

.modal.active {
    opacity: 1;
    pointer-events: all;
}

.modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
}

.modal-content {
    position: relative;
    max-width: 900px;
    max-height: 90vh;
    width: 90%;
    background: var(--color-bg-alt);
    border-radius: var(--border-radius);
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    transform: scale(0.9);
    transition: var(--transition);
}

.modal.active .modal-content {
    transform: scale(1);
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.1);
    border-radius: 50%;
    font-size: 1.5rem;
    transition: var(--transition);
    z-index: 1;
}

.modal-close:hover {
    background: rgba(0, 0, 0, 0.2);
    transform: rotate(90deg);
}

.modal-body {
    padding: 2rem;
}

.modal-header h2 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    color: var(--color-text);
}

.modal-subtitle {
    color: var(--color-text-light);
    margin-bottom: 1.5rem;
}

.modal-content-body {
    margin: 2rem 0;
    line-height: 1.8;
}

.modal-content-body img,
.modal-content-body video {
    border-radius: var(--border-radius);
    margin: 1rem 0;
}

.modal-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-border);
}

/* ================================
   About Section
   ================================ */
.about-section {
    padding: 6rem 0;
    background: var(--color-bg);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin-top: 3rem;
}

.about-text p {
    margin-bottom: 1rem;
    line-height: 1.8;
    color: var(--color-text-light);
}

.skills {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.skill-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.skill-name {
    font-weight: 600;
    color: var(--color-text);
}

.skill-bar {
    height: 10px;
    background: var(--color-bg-alt);
    border-radius: 10px;
    overflow: hidden;
}

.skill-level {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    border-radius: 10px;
    transition: width 1s ease-out;
}

/* ================================
   Contact Section
   ================================ */
.contact-section {
    padding: 6rem 0;
    background: var(--color-bg-alt);
}

.contact-content {
    text-align: center;
    max-width: 600px;
    margin: 3rem auto 0;
}

.contact-content p {
    margin-bottom: 2rem;
    font-size: 1.1rem;
    color: var(--color-text-light);
}

/* ================================
   Footer
   ================================ */
.footer {
    padding: 2rem 0;
    background: var(--color-text);
    color: white;
    text-align: center;
}

/* ================================
   Scroll to Top
   ================================ */
.scroll-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
    z-index: 999;
}

.scroll-top.visible {
    opacity: 1;
    pointer-events: all;
}

.scroll-top:hover {
    transform: translateY(-5px);
}

.scroll-top svg {
    stroke: white;
    fill: none;
    stroke-width: 2;
}

/* ================================
   Responsive Design
   ================================ */
@media (max-width: 768px) {
    .mobile-toggle {
        display: flex;
    }

    .nav-links {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-bg);
        flex-direction: column;
        padding: 2rem;
        box-shadow: var(--shadow-md);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: var(--transition);
    }

    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .filter-buttons {
        justify-content: flex-start;
    }

    .hero-title {
        font-size: 2.5rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .section-title {
        font-size: 2rem;
    }

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

    .modal-content {
        width: 95%;
    }

    .modal-body {
        padding: 1.5rem;
    }
}

/* ================================
   Project Detail Page
   ================================ */
.project-detail-section {
    padding: 8rem 0 4rem;
    min-height: 100vh;
    background: var(--color-bg);
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-primary);
    font-weight: 500;
    margin-bottom: 2rem;
    transition: var(--transition);
}

.back-link:hover {
    gap: 0.75rem;
    color: var(--color-primary-dark);
}

.back-link svg {
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
}

.project-detail {
    max-width: 900px;
    margin: 0 auto;
}

.project-detail-content {
    background: var(--color-bg-alt);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    animation: fadeInUp 0.6s ease-out;
}

.project-detail-header {
    padding: 3rem;
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    color: white;
}

.project-detail-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.project-detail-subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    margin-bottom: 1.5rem;
}

.project-detail-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1.5rem;
}

.project-date {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    opacity: 0.9;
}

.project-date svg {
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
}

.project-detail-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.project-detail-tags .tag {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.project-detail-image {
    width: 100%;
    overflow: hidden;
    background: var(--color-bg-alt);
}

.project-detail-image img {
    width: 100%;
    height: auto;
    display: block;
}

.project-detail-body {
    padding: 3rem;
    line-height: 1.8;
    color: var(--color-text);
}

.project-detail-body h1,
.project-detail-body h2,
.project-detail-body h3 {
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--color-text);
}

.project-detail-body h1 {
    font-size: 2rem;
}

.project-detail-body h2 {
    font-size: 1.5rem;
}

.project-detail-body h3 {
    font-size: 1.25rem;
}

.project-detail-body p {
    margin-bottom: 1rem;
}

.project-detail-body ul,
.project-detail-body ol {
    margin-left: 2rem;
    margin-bottom: 1rem;
}

.project-detail-body img,
.project-detail-body video {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    margin: 2rem auto;
    box-shadow: var(--shadow-md);
}

.project-detail-body a {
    color: var(--color-primary);
    text-decoration: underline;
}

.project-detail-body a:hover {
    color: var(--color-primary-dark);
}

.project-detail-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    padding: 2rem 3rem 3rem;
    background: var(--color-bg-alt);
}

.project-detail-actions .btn-primary,
.project-detail-actions .btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.project-detail-actions svg {
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
}

.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
    text-align: center;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-bottom: 1rem;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.error-message {
    text-align: center;
    padding: 4rem 2rem;
}

.error-message svg {
    stroke: var(--color-text-light);
    fill: none;
    stroke-width: 2;
    margin: 0 auto 1rem;
}

.error-message h2 {
    color: var(--color-text);
    margin-bottom: 2rem;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive adjustments for project detail page */
@media (max-width: 768px) {
    .project-detail-section {
        padding: 6rem 0 2rem;
    }

    .project-detail-header {
        padding: 2rem 1.5rem;
    }

    .project-detail-title {
        font-size: 1.75rem;
    }

    .project-detail-subtitle {
        font-size: 1rem;
    }

    .project-detail-body {
        padding: 2rem 1.5rem;
    }

    .project-detail-actions {
        padding: 1.5rem;
    }
}

/* ================================
   Edit Mode (Localhost only)
   ================================ */
.edit-button-container {
    padding: 1rem 3rem 0;
    display: flex;
    justify-content: flex-end;
}

.btn-edit {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-edit:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
}

.btn-edit svg {
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
}

.edit-mode {
    padding: 2rem 3rem;
}

.edit-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding: 1rem;
    background: var(--color-bg-alt);
    border-radius: var(--border-radius);
}

.edit-label {
    font-weight: 600;
    color: var(--color-primary);
}

.edit-actions {
    display: flex;
    gap: 1rem;
}

.btn-edit-save,
.btn-edit-cancel {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-edit-save {
    background: #22c55e;
    color: white;
}

.btn-edit-save:hover {
    background: #16a34a;
}

.btn-edit-cancel {
    background: #ef4444;
    color: white;
}

.btn-edit-cancel:hover {
    background: #dc2626;
}

.edit-textarea {
    width: 100%;
    min-height: 400px;
    padding: 1rem;
    background: var(--color-bg);
    color: var(--color-text);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    font-family: 'Courier New', monospace;
    font-size: 0.95rem;
    line-height: 1.6;
    resize: vertical;
}

.edit-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
}

.notification {
    position: fixed;
    top: 100px;
    right: 2rem;
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    z-index: 10000;
    opacity: 0;
    transform: translateX(400px);
    transition: all 0.3s ease;
}

.notification.show {
    opacity: 1;
    transform: translateX(0);
}

.notification-success {
    background: #22c55e;
    color: white;
}

.notification-error {
    background: #ef4444;
    color: white;
}

@media (max-width: 768px) {
    .edit-button-container {
        padding: 1rem 1.5rem 0;
    }

    .edit-mode {
        padding: 1.5rem;
    }

    .edit-toolbar {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }

    .notification {
        right: 1rem;
        left: 1rem;
    }
}