/*
 * style.css - Dipesh Kharel Portfolio Stylesheet (FINAL VERBOSE RE-AUDIT)
 * ----------------------------------------------------------------------
 * Re-validated against the original structure. All features, variables, 
 * and media queries are present and optimized for cross-theme resilience.
 */

/* 1. Global Reset & Variables */
:root {
    --primary-color: #007bff; /* Professional Blue */
    --primary-hover: #0056b3;
    --secondary-color: #6c757d; /* Grey/Accent */
    
    /* Light Theme Base */
    --background-light: #f4f7f6;
    --text-color-light: #333;
    --card-bg-light: #ffffff;
    --hero-gradient-start: #f4f7f6; /* Used by Hero */
    --hero-gradient-end: #e0eafc;   /* Used by Hero */
    
    /* Dark Theme Base */
    --background-dark: #2c3e50;
    --text-color-dark: #ecf0f1;
    --card-bg-dark: #34495e;
    --hero-gradient-start-dark: #2c3e50; /* Used by Dark Hero */
    --hero-gradient-end-dark: #1c2a37;   /* Used by Dark Hero */
    
    --shadow-soft: 0 4px 12px rgba(0, 0, 0, 0.1);
    --radius-lg: 12px;
    --transition-speed: 0.3s;
    --font-family: 'Poppins', sans-serif;
}

/* Dark Mode Overrides (FIX: Centralizing variables to ensure all components transition) */
.dark-mode {
    /* Main Backgrounds */
    --background-light: var(--background-dark);
    /* Text Color */
    --text-color-light: var(--text-color-dark);
    /* Card/Header Backgrounds */
    --card-bg-light: var(--card-bg-dark);
    /* Hero Gradient Colors (They now use the dark values) */
    --hero-gradient-start: var(--hero-gradient-start-dark); 
    --hero-gradient-end: var(--hero-gradient-end-dark);     
    /* Shadow adjustment for contrast */
    --shadow-soft: 0 4px 12px rgba(0, 0, 0, 0.3);
}

/* 2. Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-color-light); /* Will be dark or light based on .dark-mode */
    background-color: var(--background-light); /* Will be dark or light based on .dark-mode */
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

h1, h2, h3 {
    margin-bottom: 0.5em;
    font-weight: 600;
    transition: color var(--transition-speed); /* Ensure smooth color transition */
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-speed);
}

a:hover {
    color: var(--primary-hover);
}

/* 3. Header and Navigation */
header {
    background-color: var(--card-bg-light);
    box-shadow: var(--shadow-soft);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: background-color var(--transition-speed), box-shadow var(--transition-speed);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.nav-menu ul {
    list-style: none;
    display: flex;
}
.nav-menu ul li {
    margin-left: 25px;
}

.nav-menu ul li a {
    font-weight: 500;
    padding: 5px 0;
    position: relative;
    color: var(--text-color-light);
}

/* Active link/Scroll spy indicator */
.nav-menu ul li a.active-link::after {
    width: 100%;
}

.nav-menu ul li a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width var(--transition-speed);
}

.nav-menu ul li a:hover::after {
    width: 100%;
}

.hamburger, .dark-mode-toggle {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-color-light);
    cursor: pointer;
    transition: color 0.2s;
}

/* A11y: Focus and hover state for controls */
.dark-mode-toggle:hover, .hamburger:hover {
    color: var(--primary-color);
}
.dark-mode-toggle:focus-visible, .hamburger:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.5); 
    border-radius: 4px;
}

.nav-controls {
    display: flex;
    align-items: center;
}
.dark-mode-toggle {
    margin-right: 15px;
}

.hamburger {
    display: none; /* Hidden on desktop */
}

/* 4. Hero Section */
.hero-section {
    min-height: 90vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--hero-gradient-start) 0%, var(--hero-gradient-end) 100%);
    transition: background var(--transition-speed);
}

/* REMOVED: Redundant dark mode override because variables now handle it:
.dark-mode .hero-section {
    background: linear-gradient(135deg, var(--background-dark) 0%, #1c2a37 100%);
}
*/

.hero-content-grid {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 40px 0;
}

.hero-text {
    flex: 1;
    padding-right: 40px; 
    text-align: left; 
}

.hero-content-grid h1 {
    font-size: 3.5rem;
    margin-bottom: 0.25em;
}

.hero-text h2 { /* Targeting the new H2 headline element */
    font-size: 1.5rem;
    color: var(--secondary-color);
    margin-bottom: 2em;
    font-weight: 500;
}

.cta-button {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 12px 30px;
    border-radius: 50px;
    font-weight: 600;
    transition: background-color var(--transition-speed), transform var(--transition-speed);
    box-shadow: 0 4px 8px rgba(0, 123, 255, 0.4);
}

.cta-button:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(0, 123, 255, 0.6);
}

.hero-image-container {
    flex: 1;
    max-width: 450px;
    display: flex;
    justify-content: flex-end; 
    align-items: center;
}

.profile-image {
    width: 350px;
    height: 350px;
    object-fit: cover; 
    border-radius: 50%;
    /* FIX: Use variable for border color to ensure it flips in dark mode */
    border: 8px solid var(--card-bg-light); 
    box-shadow: 0 10px 30px rgba(0, 123, 255, 0.4);
    
    /* Initial state for the cool animation (JS controlled) */
    opacity: 0; 
    transform: scale(0.8) rotate(15deg); 
    transition: all 0.8s cubic-bezier(0.68, -0.55, 0.27, 1.55); 
}

.is-visible .profile-image {
    opacity: 1;
    transform: scale(1) rotate(0deg);
}


/* 5. General Section Styles */
.section {
    padding: 80px 0;
    transition: background-color var(--transition-speed);
}

/* REMOVED: Original section style with redundant .bg-light class: 
.bg-light { 
    background-color: var(--background-light); 
}
*/

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 40px;
    position: relative;
    padding-bottom: 10px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 5px;
}

/* 6. Experience Section Styling (Timeline) */
.timeline-container {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px 0;
}

/* Timeline Line */
.timeline-container::after {
    content: '';
    position: absolute;
    width: 4px;
    background-color: var(--primary-color);
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -2px; 
    z-index: 0;
}

.timeline-item {
    padding: 10px 40px;
    position: relative;
    width: 50%;
    margin: 20px 0;
}

/* Timeline Dot */
.timeline-dot {
    height: 15px;
    width: 15px;
    background-color: var(--primary-color);
    position: absolute;
    top: 30px;
    border-radius: 50%;
    z-index: 1;
}

/* Year Label (Desktop only) */
.timeline-year {
    position: absolute;
    top: 25px; 
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--primary-color);
    background-color: var(--background-light); /* Uses background var that flips in dark mode */
    padding: 2px 8px; 
    border-radius: 4px;
    z-index: 10; 
    transition: background-color var(--transition-speed), color var(--transition-speed); 
}

/* REMOVED: Original redundant dark mode override: 
.dark-mode .timeline-year {
    background-color: var(--background-dark); 
}
*/

/* Position Year for Left Items (Odd) */
.timeline-item:nth-child(odd) .timeline-year {
    right: -10px; 
    transform: translateX(100%); 
}

/* Position Year for Right Items (Even) */
.timeline-item:nth-child(even) .timeline-year {
    left: -10px; 
    transform: translateX(-100%); 
}

/* Content on the Right Side (Even items) */
.timeline-item:nth-child(even) {
    left: 50%;
    padding-left: 60px;
}
.timeline-item:nth-child(even) .timeline-dot {
    left: -7.5px;
}

/* Content on the Left Side (Odd items) */
.timeline-item:nth-child(odd) {
    left: 0;
    padding-right: 60px;
    text-align: right; 
}
.timeline-item:nth-child(odd) .timeline-dot {
    right: -7.5px;
}

/* Arrow */
.timeline-content::after {
    content: '';
    position: absolute;
    width: 0;
    height: 0;
    border: 10px solid transparent;
    top: 30px;
}

/* Arrow for Left Item (Odd) - Pointing right */
.timeline-item:nth-child(odd) .timeline-content::after {
    border-left-color: var(--card-bg-light);
    right: -20px;
}
/* Removed original redundant dark mode override: 
.dark-mode .timeline-item:nth-child(odd) .timeline-content::after {
    border-left-color: var(--card-bg-dark);
}
*/

/* Arrow for Right Item (Even) - Pointing left */
.timeline-item:nth-child(even) .timeline-content::after {
    border-right-color: var(--card-bg-light);
    left: -20px;
}
/* Removed original redundant dark mode override: 
.dark-mode .timeline-item:nth-child(even) .timeline-content::after {
    border-right-color: var(--card-bg-dark);
}
*/

/* Styling for the content box */
.timeline-content {
    padding: 20px;
    background-color: var(--card-bg-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-soft);
    position: relative;
    transition: transform 0.3s ease, box-shadow 0.3s ease, background-color var(--transition-speed);
    text-align: left; 
}

.timeline-content:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.timeline-content h3 {
    color: var(--primary-color);
    margin-top: 0;
    margin-bottom: 5px;
    font-size: 1.25rem; 
}

.timeline-content .duration-info {
    font-style: italic;
    color: var(--secondary-color);
    margin-bottom: 15px;
    display: block; 
}

.timeline-content .mobile-year {
    display: none; 
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 5px;
    font-size: 1.1rem;
}

.timeline-content ul {
    list-style-type: none;
    padding-left: 0; 
}

.timeline-content ul li {
    margin-bottom: 8px;
    position: relative;
    padding-left: 15px;
}

.timeline-content ul li::before {
    content: "\f058"; 
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    color: var(--primary-color);
    position: absolute;
    left: 0;
    top: 0.25rem; /* Adjusted for better text alignment */
    font-size: 0.8em;
}

/* 7. Skills Section */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.skill-card {
    background-color: var(--card-bg-light);
    padding: 30px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-soft);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease, background-color var(--transition-speed);
}

.skill-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.icon-lg {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.soft-skills {
    max-width: 900px;
    margin: 40px auto 0;
    padding: 30px;
    border: 2px solid var(--primary-color);
    border-radius: var(--radius-lg);
    text-align: center;
    background-color: var(--card-bg-light);
    box-shadow: var(--shadow-soft);
    transition: background-color var(--transition-speed), box-shadow var(--transition-speed);
}

.soft-skills h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.5rem;
}

.soft-skills p {
    font-weight: 400;
    font-size: 1.1rem;
    color: var(--text-color-light);
}

/* 8. Projects Section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.project-card {
    background-color: var(--card-bg-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-soft);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease, background-color var(--transition-speed);
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.project-image-placeholder {
    height: 200px;
    /* Generic placeholder image/styling for now. Replace with actual images later. */
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><text x="50%" y="50%" dominant-baseline="middle" text-anchor="middle" font-size="10" fill="white">Project Image</text></svg>');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    transition: background-color var(--transition-speed);
}

/* 9. Research Section (NEW) */
.research-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.research-card {
    background-color: var(--card-bg-light);
    padding: 30px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-soft);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease, background-color var(--transition-speed);
}

.research-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.research-card h3 {
    color: var(--primary-color);
}

.research-card .icon-lg {
    margin-bottom: 20px;
}

.research-card .project-link {
    margin-top: 15px;
    display: inline-block;
}

/* 10. Learn With Me Section (NEW) */
.section-subtitle {
    font-size: 1.15rem;
    color: var(--secondary-color);
}
.learn-grid {
    /* Overrides .skills-grid default to allow 4 smaller cards */
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}


/* 11. Contact Section */
.contact-form {
    max-width: 600px;
    margin: 0 auto;
    background-color: var(--card-bg-light);
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-soft);
    transition: background-color var(--transition-speed), box-shadow var(--transition-speed);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #ccc;
    border-radius: 8px; 
    background-color: var(--background-light); /* Light background for inputs even in light mode */
    color: var(--text-color-light);
    transition: border-color var(--transition-speed), box-shadow var(--transition-speed), background-color var(--transition-speed), color var(--transition-speed);
    font-family: var(--font-family);
    font-size: 1rem;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.2);
}

/* Dark Mode Input Fix (FIX: Ensuring high contrast and appropriate border) */
.dark-mode .form-group input,
.dark-mode .form-group textarea {
    background-color: #3f5168; 
    border: 1px solid #4a6078;
    color: var(--text-color-dark);
}

.submit-button {
    width: 100%;
    border: none;
    cursor: pointer;
}

.form-note {
    text-align: center;
    margin-top: 25px;
    font-size: 0.9rem;
    color: var(--secondary-color);
    line-height: 1.5;
}

/* 12. Footer */
footer {
    background-color: var(--card-bg-dark); /* Uses card-bg-dark for better consistency */
    color: white;
    padding: 25px 0;
    transition: background-color var(--transition-speed);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    text-align: center;
}

.social-links a {
    color: white;
    font-size: 1.2rem;
    margin-left: 15px;
    transition: color 0.2s;
}

.social-links a:hover {
    color: var(--primary-color);
}

/* 13. Subtle Animations (JS controlled) */
.animate-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* 14. Responsive Design (Media Queries) */
@media (max-width: 992px) {
    /* Larger tablets/small desktops adjustments */
    .hero-content-grid h1 {
        font-size: 3rem;
    }
    .hero-text h2 {
        font-size: 1.3rem;
    }
    .profile-image {
        width: 300px;
        height: 300px;
    }
}

@media (max-width: 768px) {
    
    /* General Mobile */
    .section {
        padding: 60px 0;
    }
    .hero-section {
        min-height: 70vh;
    }

    /* Navigation (FIX: Using 'fixed' ensures full coverage and stability on mobile) */
    .nav-menu {
        position: fixed; 
        top: 60px; /* Placeholder, rely on JS to calculate header height for robust solution */
        left: 0;
        width: 100%;
        background-color: var(--card-bg-light);
        box-shadow: var(--shadow-soft);
        transform: translateX(-100%);
        transition: transform 0.3s ease-in-out, background-color var(--transition-speed), box-shadow var(--transition-speed);
        flex-direction: column;
        z-index: 1001; /* Ensure it's above the sticky header (z-index: 1000) */
        height: 100vh;
        overflow-y: auto;
    }

    .nav-menu.active {
        transform: translateX(0);
    }

    .nav-menu ul {
        flex-direction: column;
        padding: 20px 0;
        width: 100%;
    }

    .nav-menu ul li {
        margin: 0;
        border-bottom: 1px solid #eee;
    }

    .dark-mode .nav-menu ul li {
        border-bottom-color: #4a6078;
    }

    .nav-menu ul li a {
        display: block;
        padding: 15px 25px;
    }
    
    .nav-menu ul li a::after {
        content: none;
    }

    .hamburger {
        display: block;
    }

    /* Hero */
    .hero-content-grid {
        flex-direction: column;
        text-align: center;
        padding-top: 60px;
    }

    .hero-image-container {
        order: -1;
        margin-bottom: 30px;
        justify-content: center;
    }

    .hero-text {
        padding-right: 0;
    }

    .hero-content-grid h1 {
        font-size: 2.5rem;
    }

    .profile-image {
        width: 250px;
        height: 250px;
    }

    /* Timeline Mobile Adjustments (All content is now correctly consolidated on the right of the line) */
    .timeline-container::after {
        left: 20px; 
    }

    .timeline-item {
        width: 100%;
        padding-left: 60px;
        padding-right: 15px;
    }

    /* Reset positioning for all items on mobile to be on the right of the line */
    .timeline-item:nth-child(odd),
    .timeline-item:nth-child(even) {
        left: 0;
        padding-left: 60px;
        padding-right: 15px;
        text-align: left;
    }

    /* Align dots to the new left line position */
    .timeline-item:nth-child(odd) .timeline-dot,
    .timeline-item:nth-child(even) .timeline-dot {
        left: 12.5px;
        right: auto;
    }
    
    .timeline-year {
        display: none; 
    }
    
    /* Hide the arrow on mobile (since all content is on one side) */
    .timeline-content::after {
        border: none;
    }
    
    /* Show the mobile year element instead */
    .timeline-content .mobile-year {
        display: block; 
    }
    
    /* Footer */
    .footer-content {
        flex-direction: column;
    }

    .social-links {
        margin-top: 15px;
    }

    .social-links a {
        margin: 0 10px;
    }
}