/* CSS Variables for consistent theming */
:root {
    --primary-bg: #0a0c14;
    --secondary-bg: #1a1f2e;
    --accent-green: #8bc34a;
    --accent-blue: #42a5f5;
    --text-light: #ffffff;
    --text-dark: #1D263B;
    --terminal-bg: rgba(25, 40, 50, 0.3);
    --card-bg: rgba(20, 30, 40, 0.4);
    --border-color: #2a4a5a;
    --hover-color: #a5d6a5;
    --header-bg: rgba(10, 15, 25, 0.95);
    --text-primary: #ffffff;
    --skill-bg: #142235;
    --skill-border: #334f7a;
    --skill-hover: #1f3452;
    --skill-hover-border: #80a6ff;
    --table-bg: #0c1322;
    --table-header-bg: #1a2b49;
    --table-row-hover: #1b2f51;
    --office-card-bg: #142235;
    --office-card-border: #334f7a;
    --office-card-hover-border: #5f8aff;
}

/* Light theme */
[data-theme="light"] {
    --primary-bg: #f0f4f8;
    --secondary-bg: #ffffff;
    --text-light: #1a1a2e;
    --text-dark: #16213e;
    --accent-green: #2e7d32;
    --accent-blue: #1976d2;
    --border-color: #b8d4fe;
    --card-bg: rgba(255, 255, 255, 0.9);
    --header-bg: rgba(255, 255, 255, 0.98);
    --text-primary: #1a1a2e;
    --skill-bg: #ffffff;
    --skill-border: #2e7d32;
    --skill-hover: #e8f5e9;
    --skill-hover-border: #2e7d32;
    --table-bg: #ffffff;
    --table-header-bg: #e8f0fe;
    --table-row-hover: #e1f5e8;
    --office-card-bg: #ffffff;
    --office-card-border: #c8e6c9;
    --office-card-hover-border: #2e7d32;
}

/* Global Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Nunito', sans-serif;
    font-size: 16px;
    font-weight: 400;
    line-height: 1.6;
    color: var(--text-light);
    background: var(--primary-bg);
    min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4, h5 {
    font-family: 'Fira Mono', monospace;
    font-weight: 700;
    letter-spacing: 0.05em;
}

h2 {
    font-size: 2em;
    margin-bottom: 30px;
    color: var(--text-light);
}

h3 {
    font-size: 1.4em;
    margin-bottom: 15px;
    color: var(--text-light);
}

/* Links */
a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

.green {
    color: var(--accent-green);
    font-weight: 600;
}

.hyperlink {
    color: var(--accent-blue);
    text-decoration: underline;
    transition: color 0.3s ease;
}

.hyperlink:hover {
    color: var(--hover-color);
}

/* Header Styles */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 30px;
    background: var(--header-bg);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 2px solid var(--accent-green);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
}

.header-logo {
    font-size: 1.5em;
    font-weight: 700;
    letter-spacing: 0.1em;
    color: var(--accent-green);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s ease;
}

.header-logo:hover {
    transform: scale(1.05);
    color: var(--hover-color);
}

.nav {
    display: flex;
    align-items: center;
    gap: 20px;
}

.toggle {
    display: none;
    font-size: 1.8em;
    cursor: pointer;
    color: var(--text-light);
    transition: color 0.3s ease;
}

.toggle:hover {
    color: var(--accent-green);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-item a {
    color: var(--text-light);
    font-weight: 600;
    letter-spacing: 0.05em;
    padding: 8px 0;
    border-bottom: 2px solid transparent;
    transition: all 0.3s ease;
}

.nav-item a:hover {
    color: var(--accent-green);
    border-bottom-color: var(--accent-green);
}

/* Theme Preview Circles */
.theme-preview {
    display: flex;
    gap: 10px;
    margin-left: 20px;
}

.color-dot {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.color-dot:hover {
    transform: scale(1.2);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

.color-dot.active {
    border-color: var(--accent-green);
    transform: scale(1.1);
}

.dot-dark { background-color: #0a0c14; }
.dot-light { background-color: #f8f9fa; border: 2px solid #666; }

/* Main Container */
.main-container {
    max-width: 1400px;
    margin: 100px auto 50px;
    padding: 0 30px;
}

/* Sections */
section {
    margin-bottom: 80px;
}

.section-description {
    max-width: 900px;
    margin: 20px auto;
    text-align: center;
    font-size: 1.1em;
    line-height: 1.8;
    color: var(--text-light);
    opacity: 0.9;
}

/* Projects Grid */
.card-title {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 40px;
}

.card-title img {
    width: 30px;
    height: 30px;
    filter: brightness(0) invert(1);
}

[data-theme="light"] .card-title img {
    filter: brightness(0.5) invert(0);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.project-card {
    background: var(--card-bg);
    backdrop-filter: blur(5px);
    border-radius: 15px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    border-color: var(--accent-green);
}

.project-preview-img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-bottom: 2px solid var(--border-color);
    background-color: var(--secondary-bg);
}

.image-fallback {
    width: 100%;
    height: 180px;
    background: linear-gradient(135deg, var(--accent-green) 0%, var(--accent-blue) 100%);
    display: none;
    align-items: center;
    justify-content: center;
    border-bottom: 2px solid var(--border-color);
}

.image-fallback i {
    font-size: 3em;
    color: var(--text-dark);
}

.card-info {
    padding: 25px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.project-title {
    color: var(--accent-green);
    margin-bottom: 15px;
    font-size: 1.3em;
    line-height: 1.4;
}

.project-skills {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 15px;
}

.skill-tag {
    background: rgba(57, 121, 146, 0.3);
    border: 1px solid var(--border-color);
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.9em;
    color: var(--text-light);
}

[data-theme="light"] .skill-tag {
    background: rgba(46, 125, 50, 0.1);
    border-color: #2e7d32;
    color: #1a1a2e;
}

.item-details {
    margin: 15px 0;
    color: var(--text-light);
    opacity: 0.9;
    flex: 1;
}

.item-details ul {
    list-style: none;
    padding-left: 0;
}

.item-details li {
    margin-bottom: 8px;
    position: relative;
    padding-left: 20px;
}

.item-details li::before {
    content: "•";
    color: var(--accent-green);
    position: absolute;
    left: 0;
    font-size: 1.2em;
}

.project-links {
    display: flex;
    gap: 15px;
    margin-top: 20px;
    flex-wrap: wrap;
}

.project-links a {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--accent-green);
    font-weight: 600;
    padding: 8px 16px;
    border: 1px solid var(--accent-green);
    border-radius: 25px;
    transition: all 0.3s ease;
    font-size: 0.95em;
}

.project-links a:hover {
    background: var(--accent-green);
    color: var(--text-dark);
}

.project-links i {
    font-size: 1.1em;
}

/* Resume Card */
.resume-card {
    max-width: 1350px;
    width: 100%;
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(75, 120, 200, 0.25);
    border-radius: 3.5rem;
    padding: 2.8rem 2.2rem;
    box-shadow: 0 40px 70px -10px #00000080, 0 0 0 1px #2b4b82 inset;
    transition: box-shadow 0.2s ease;
    margin: 2rem auto;
}

.resume-card:hover {
    box-shadow: 0 50px 90px -5px #001d4c, 0 0 0 1px #6086cf inset;
}

[data-theme="light"] .resume-card {
    background: rgba(255, 255, 255, 0.95);
    border: 1px solid rgba(46, 125, 50, 0.3);
    box-shadow: 0 40px 70px -10px rgba(0, 0, 0, 0.1), 0 0 0 1px #c8e6c9 inset;
}

[data-theme="light"] .resume-card:hover {
    box-shadow: 0 50px 90px -5px rgba(46, 125, 50, 0.2), 0 0 0 1px #2e7d32 inset;
}

/* Headings inside resume-card */
.resume-card h2 {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    font-weight: 510;
    font-size: 2rem;
    letter-spacing: -0.02em;
    color: var(--text-light);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.7rem;
    margin: 2.8rem 0 1.8rem 0;
    transition: border-color 0.15s, padding-left 0.15s;
}

.resume-card h2:hover {
    border-bottom-color: var(--accent-green);
    padding-left: 0.5rem;
}

.resume-card h2 img {
    width: 30px;
    height: 30px;
    filter: brightness(0) invert(1);
    transition: transform 0.2s;
}

[data-theme="light"] .resume-card h2 img {
    filter: brightness(0.5) invert(0);
}

.resume-card h2:hover img {
    transform: rotate(3deg) scale(1.1);
}

/* STREAK + ICONS */
.streak-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    margin: 2rem 0;
}

.streak-section img {
    max-width: 100%;
    border-radius: 24px;
    transition: filter 0.3s, transform 0.25s, box-shadow 0.3s;
}

.streak-section img:first-child:hover {
    transform: scale(1.02) translateY(-3px);
    filter: drop-shadow(0 10px 18px var(--accent-green));
    box-shadow: 0 0 0 2px var(--accent-green);
}

.skill-icons-row img:hover {
    transform: scale(1.04);
    filter: drop-shadow(0 0 12px var(--accent-green));
}

/* SKILL TILES */
.skills-panel {
    display: flex;
    flex-wrap: wrap;
    gap: 0.9rem 1.3rem;
    justify-content: center;
    margin: 2rem 0 1.2rem 0;
}

.skill {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    background: var(--skill-bg);
    padding: 0.75rem 1.6rem;
    border-radius: 60px;
    border: 1px solid var(--skill-border);
    box-shadow: 0 12px 18px -12px #000c1e;
    font-size: 1.1rem;
    font-weight: 470;
    color: var(--text-light);
    transition: all 0.2s cubic-bezier(0.2, 0, 0, 1);
    cursor: default;
    backdrop-filter: blur(4px);
}

.skill:hover {
    background: var(--skill-hover);
    border-color: var(--skill-hover-border);
    transform: translateY(-5px) scale(1.03);
    box-shadow: 0 22px 28px -14px var(--accent-green), 0 0 0 1px var(--accent-green) inset;
}

.skill img {
    width: 26px;
    height: 26px;
    transition: transform 0.15s;
    filter: brightness(1);
}

[data-theme="light"] .skill img {
    filter: brightness(0.7);
}

.skill:hover img {
    transform: scale(1.15) rotate(1deg);
}

.material-icons {
    font-size: 26px;
    color: var(--accent-green);
    transition: color 0.2s, transform 0.2s;
}

.skill:hover .material-icons {
    color: var(--accent-green);
    transform: scale(1.15);
}

/* Skills grid with categories */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin: 1.8rem 0 3rem;
}

.skill-category {
    background: var(--skill-bg);
    border-radius: 2.5rem;
    padding: 1.6rem 1.8rem;
    border: 1px solid var(--skill-border);
    transition: all 0.25s;
}

.skill-category:hover {
    background: var(--skill-hover);
    border-color: var(--skill-hover-border);
    transform: translateY(-6px);
    box-shadow: 0 26px 30px -20px var(--accent-green);
}

.skill-category h4 {
    font-size: 1.4rem;
    font-weight: 490;
    margin-bottom: 1.3rem;
    color: var(--text-light);
    transition: color 0.2s, transform 0.2s;
}

.skill-category:hover h4 {
    color: var(--accent-green);
    transform: translateX(5px);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
}

.skill-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    background: var(--skill-bg);
    padding: 0.45rem 1.2rem;
    border-radius: 30px;
    border: 1px solid var(--skill-border);
    transition: all 0.2s;
    color: var(--text-light);
}

.skill-tag:hover {
    background: var(--skill-hover);
    border-color: var(--skill-hover-border);
    transform: scale(1.04) translateY(-2px);
    box-shadow: 0 10px 12px -10px var(--accent-green);
}

.skill-tag img {
    width: 20px;
    height: 20px;
    transition: transform 0.15s;
    filter: brightness(1);
}

[data-theme="light"] .skill-tag img {
    filter: brightness(0.7);
}

.skill-tag:hover img {
    transform: rotate(4deg) scale(1.25);
}

.skill-tag i {
    font-size: 1.2rem;
    color: var(--accent-green);
    transition: transform 0.2s;
}

.skill-tag:hover i {
    transform: scale(1.2);
    color: var(--accent-green);
}

/* Courses table */
.courses-wrapper {
    background: var(--table-bg);
    border-radius: 2.5rem;
    padding: 2rem 1.8rem;
    border: 1px solid var(--skill-border);
    transition: border 0.2s, box-shadow 0.2s;
    margin: 2.2rem 0;
}

.courses-wrapper:hover {
    border-color: var(--accent-green);
    box-shadow: 0 0 0 2px var(--accent-green), 0 25px 35px -18px var(--accent-green);
}

.courses-scroll {
    max-height: 520px;
    overflow-y: auto;
    border-radius: 1.8rem;
    scrollbar-width: thin;
    scrollbar-color: var(--accent-green) var(--table-bg);
}

.courses-scroll::-webkit-scrollbar {
    width: 8px;
}

.courses-scroll::-webkit-scrollbar-track {
    background: var(--table-bg);
}

.courses-scroll::-webkit-scrollbar-thumb {
    background: var(--accent-green);
    border-radius: 10px;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.96rem;
    background: var(--table-bg);
}

th {
    background: var(--table-header-bg);
    color: var(--text-light);
    font-weight: 530;
    padding: 1rem 0.7rem;
    position: sticky;
    top: 0;
    z-index: 5;
    border-bottom: 2px solid var(--accent-green);
    transition: background 0.15s;
}

th:hover {
    background: var(--skill-hover);
}

td {
    padding: 0.75rem 0.7rem;
    border-bottom: 1px solid var(--skill-border);
    transition: background 0.15s, color 0.1s;
    color: var(--text-light);
}

tr:hover td {
    background: var(--table-row-hover);
    color: var(--text-light);
}

/* OFFICE SKILLS SECTION */
.office-skills-section {
    margin: 3rem 0;
    padding: 1rem 0;
    width: 100%;
}

.office-skills-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.office-skill-card {
    background: var(--office-card-bg);
    border: 2px solid var(--office-card-border);
    border-radius: 16px;
    padding: 1.5rem;
    position: relative;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    cursor: pointer;
    animation: fadeInUp 0.6s ease backwards;
}

.office-skill-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-green), var(--accent-blue));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

.office-skill-card:hover {
    transform: translateY(-8px) scale(1.02);
    border-color: var(--office-card-hover-border);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
}

.office-skill-card:hover::before {
    transform: scaleX(1);
}

.office-skill-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.office-skill-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(145deg, var(--skill-bg), var(--accent-green));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: white;
    transition: all 0.4s ease;
}

.office-skill-card:hover .office-skill-icon {
    transform: rotate(360deg) scale(1.1);
    background: linear-gradient(145deg, var(--accent-green), var(--accent-blue));
    box-shadow: 0 0 20px var(--accent-green);
}

.office-skill-name {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-light);
    margin: 0;
    transition: color 0.3s ease;
}

.office-skill-card:hover .office-skill-name {
    color: var(--accent-green);
}

.office-skill-description {
    color: var(--text-light);
    font-size: 1rem;
    line-height: 1.5;
    margin: 0.8rem 0 1.2rem;
    padding-left: 0.5rem;
    border-left: 3px solid transparent;
    transition: all 0.3s ease;
    opacity: 0.8;
}

.office-skill-card:hover .office-skill-description {
    border-left-color: var(--accent-green);
    padding-left: 1rem;
    color: var(--text-light);
    opacity: 1;
}

.office-skill-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent-green);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    padding: 0.5rem 0;
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateX(-10px);
}

.office-skill-card:hover .office-skill-link {
    opacity: 1;
    transform: translateX(0);
}

.office-skill-link:hover {
    color: var(--accent-green);
    transform: translateX(5px) !important;
}

.office-skill-link i {
    font-size: 0.9rem;
    transition: transform 0.3s ease;
}

.office-skill-link:hover i {
    transform: translateX(5px);
}

/* Nav item active style */
.nav-item a.active {
    color: var(--accent-green);
    border-bottom: 2px solid var(--accent-green);
    position: relative;
}

.nav-item a.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--accent-green);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from { width: 0; }
    to { width: 100%; }
}

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

.office-skill-card:nth-child(1) { animation-delay: 0.1s; }
.office-skill-card:nth-child(2) { animation-delay: 0.2s; }
.office-skill-card:nth-child(3) { animation-delay: 0.3s; }
.office-skill-card:nth-child(4) { animation-delay: 0.4s; }
.office-skill-card:nth-child(5) { animation-delay: 0.5s; }
.office-skill-card:nth-child(6) { animation-delay: 0.6s; }

/* Footer */
.footer-container {
    margin-top: 80px;
    padding: 50px 30px 30px;
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(5px);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 30px;
    border-top: 2px solid var(--accent-green);
}

[data-theme="light"] .footer-container {
    background: rgba(255, 255, 255, 0.7);
}

.footer-column {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
}

.social-links {
    display: flex;
    gap: 25px;
    list-style: none;
    margin: 20px 0;
    flex-wrap: wrap;
    justify-content: center;
}

.social-link a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    border: 2px solid var(--accent-green);
    border-radius: 50%;
    transition: all 0.3s ease;
}

.social-link a:hover {
    background: var(--accent-green);
    transform: translateY(-3px);
}

.social-link a:hover i {
    color: var(--text-dark);
}

.social-link i {
    font-size: 1.4em;
    color: var(--text-light);
}

.copyright {
    font-size: 0.95em;
    opacity: 0.8;
    margin-top: 15px;
    color: var(--text-light);
}

.copyright i {
    margin-right: 5px;
    color: var(--accent-green);
}

.footer-note {
    text-align: center;
    opacity: 0.4;
    font-size: 0.9rem;
    margin-top: 2rem;
    transition: opacity 0.2s;
    color: var(--text-light);
}

.footer-note:hover {
    opacity: 0.9;
}

hr {
    border: 1px solid var(--border-color);
    margin: 2.2rem 0 0.2rem;
}

/* Responsive Design */
@media only screen and (max-width: 768px) {
    .header {
        padding: 12px 20px;
    }

    .header-logo {
        font-size: 1.2em;
    }

    .toggle {
        display: block;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--header-bg);
        backdrop-filter: blur(10px);
        flex-direction: column;
        align-items: center;
        justify-content: flex-start;
        padding-top: 50px;
        gap: 30px;
        transition: left 0.3s ease;
        z-index: 999;
    }

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

    .nav-item a {
        font-size: 1.3em;
    }

    .theme-preview {
        margin-left: 10px;
        gap: 5px;
    }

    .color-dot {
        width: 25px;
        height: 25px;
    }

    .main-container {
        padding: 0 15px;
        margin-top: 80px;
    }

    h2 {
        font-size: 1.5em;
    }

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

    .resume-card {
        padding: 1.5rem;
    }

    .skills-panel {
        gap: 0.6rem;
    }

    .skill {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }

    .skill img {
        width: 20px;
        height: 20px;
    }

    .material-icons {
        font-size: 20px;
    }
}

@media only screen and (min-width: 769px) and (max-width: 1024px) {
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}