/* ============================================================
   style.css — Tanmoy Ghatak Portfolio
   Sections:
   1. Reset & Variables
   2. Base
   3. Navigation
   4. Hero
   5. About
   6. Skills
   7. Background (Education & Experience)
   8. Projects
   9. Contact
   10. Responsive (Tablet & Mobile)
   ============================================================ */

/* ----------------------------------------------------------
   1. Reset & Variables
   ---------------------------------------------------------- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --navy: #0a1128;
    --gold:  #ffc800;
    --white: #ffffff;
}

/* ----------------------------------------------------------
   2. Base
   ---------------------------------------------------------- */
html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--navy);
    color: var(--white);
    overflow-x: hidden;
}

/* Reusable highlight */
.highlight      { color: var(--gold); }
.highlight-text { color: var(--gold); font-weight: 600; }

/* Section wrapper */
section {
    padding: 100px 5%;
    max-width: 1400px;
    margin: 0 auto;
}

/* Section pill badge */
.section-header {
    display: inline-block;
    border: 3px solid var(--gold);
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    margin-bottom: 3rem;
    font-weight: 600;
    font-size: 1.1rem;
}

.section-header span:first-child {
    color: var(--gold);
}

/* ----------------------------------------------------------
   3. Navigation
   ---------------------------------------------------------- */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 1.5rem 5%;
    background: rgba(10, 17, 40, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 200, 0, 0.1);
}

.nav-container {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
}

.nav-links {
    display: flex;
    gap: 3rem;
    list-style: none;
}

.nav-links a {
    color: var(--white);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--gold);
}

/* ----------------------------------------------------------
   4. Hero
   ---------------------------------------------------------- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 100px 5%;
    position: relative;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    max-width: 1400px;
    width: 100%;
    align-items: center;
}

.hero-text {
    padding-right: 2rem;
}

/* Pill badge */
.badge {
    display: inline-block;
    border: 3px solid var(--gold);
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    margin-bottom: 2rem;
    font-weight: 600;
    font-size: 1.1rem;
}

.badge span:first-child {
    color: var(--gold);
}

.hero-name {
    font-size: 4.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1rem;
    text-transform: uppercase;
}

.hero-tagline {
    font-size: 1.4rem;
    margin-bottom: 2rem;
    font-weight: 400;
}

/* Scroll arrow */
.scroll-indicator {
    margin-top: 3rem;
    text-align: center;
}

.scroll-arrow {
    width: 40px;
    height: 40px;
    border: 2px solid var(--gold);
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    animation: bounce 2s infinite;
    cursor: pointer;
}

.scroll-arrow::before {
    content: '';
    width: 10px;
    height: 10px;
    border-right: 2px solid var(--gold);
    border-bottom: 2px solid var(--gold);
    transform: rotate(45deg);
    margin-top: -3px;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40%  { transform: translateY(-10px); }
    60%  { transform: translateY(-5px); }
}

/* Profile circle */
.hero-image {
    position: relative;
    display: flex;
    justify-content: center;
}

.profile-circle {
    width: 500px;
    height: 500px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--gold) 0%, #ffdb4d 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 5px solid var(--white);
    overflow: hidden;
    position: relative;
}

.profile-circle img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Initials fallback */
.profile-initials {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--gold) 0%, #ffdb4d 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 5rem;
    font-weight: 800;
    color: var(--navy);
}

/* ----------------------------------------------------------
   5. About
   ---------------------------------------------------------- */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: flex-start;
}

.about-text {
    font-size: 1.1rem;
    line-height: 1.8;
}

.about-text h2 {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    font-weight: 700;
}

.about-text p {
    margin-bottom: 1.5rem;
}

/* Social icons */
.social-links {
    display: flex;
    gap: 1.5rem;
    margin-top: 2rem;
}

.social-icon {
    width: 50px;
    height: 50px;
    border: 2px solid var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    text-decoration: none;
    font-size: 1.2rem;
    transition: all 0.3s;
}

.social-icon:hover {
    background: var(--gold);
    border-color: var(--gold);
    color: var(--navy);
}

/* CTA buttons */
.cta-buttons {
    display: flex;
    gap: 1.5rem;
    margin-top: 2rem;
}

.btn {
    padding: 1rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s;
    display: inline-block;
    border: 2px solid var(--white);
    color: var(--white);
}

.btn-primary {
    background: transparent;
    border-color: var(--white);
}

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

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

/* ----------------------------------------------------------
   6. Skills
   ---------------------------------------------------------- */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 3rem;
    margin-top: 3rem;
}

.skill-category h4 {
    color: var(--white);
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
    font-weight: 600;
}

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

.skill-item {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.skill-icon {
    width: 60px;
    height: 60px;
    background: var(--gold);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    flex-shrink: 0;
}

.skill-item span {
    font-size: 1.1rem;
    font-weight: 500;
}

.skill-list {
    list-style: none;
}

.skill-list li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.skill-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--gold);
    font-size: 1.5rem;
}

/* ----------------------------------------------------------
   7. Background — Education & Experience
   ---------------------------------------------------------- */
.background-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    margin-top: 3rem;
}

.education-section h2,
.experience-section h2 {
    color: var(--gold);
    font-size: 2rem;
    margin-bottom: 2rem;
    text-transform: uppercase;
    font-weight: 700;
}

.certifications-title {
    margin-top: 2rem;
}

.education-item,
.experience-item {
    margin-bottom: 3rem;
    display: flex;
    gap: 1.5rem;
}

.company-logo {
    width: 80px;
    height: 80px;
    background: var(--gold);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: bold;
    flex-shrink: 0;
}

.item-content h3 {
    color: var(--gold);
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.item-content h4 {
    font-size: 1rem;
    margin-bottom: 0.3rem;
    font-weight: 600;
}

.item-content p {
    font-size: 0.95rem;
    line-height: 1.6;
    margin-top: 0.5rem;
}

.item-meta {
    color: var(--gold);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

/* ----------------------------------------------------------
   8. Projects
   ---------------------------------------------------------- */
.projects-list {
    margin-top: 3rem;
}

.project-item {
    margin-bottom: 5rem;
}

.project-number {
    font-size: 5rem;
    font-weight: 900;
    color: var(--white);
    display: inline-block;
    margin-right: 2rem;
    vertical-align: top;
    line-height: 1;
}

.project-title {
    display: inline-block;
    vertical-align: top;
    margin-top: 0.5rem;
}

.project-title h3 {
    font-size: 2.5rem;
    color: var(--gold);
    font-weight: 700;
    text-transform: uppercase;
    line-height: 1.2;
}

.project-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-top: 2rem;
}

.project-images {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.project-image {
    width: 100%;
    background: #1a2b4a;
    border-radius: 10px;
    overflow: hidden;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.project-description p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.project-meta {
    margin-top: 2rem;
}

.project-meta p {
    margin-bottom: 0.5rem;
}

.project-meta strong {
    color: var(--gold);
}

.project-buttons {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.project-btn {
    padding: 0.8rem 2rem;
    border: 2px solid var(--white);
    border-radius: 50px;
    color: var(--white);
    text-decoration: none;
    font-weight: 600;
    font-family: 'Poppins', sans-serif;
    font-size: 1rem;
    transition: all 0.3s;
    display: inline-block;
    background: transparent;
    cursor: pointer;
    line-height: 1.5;
}

.project-btn:hover {
    background: var(--gold);
    border-color: var(--gold);
    color: var(--navy);
}

/* ----------------------------------------------------------
   9. Contact
   ---------------------------------------------------------- */
.contact-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.contact-content h2 {
    font-size: 3.5rem;
    margin-bottom: 3rem;
    font-weight: 700;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin-top: 3rem;
}

.contact-item {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    font-size: 1.2rem;
}

.contact-item strong {
    color: var(--gold);
    min-width: 200px;
    text-align: right;
}

.contact-item a {
    color: var(--white);
    text-decoration: underline;
}

.contact-icon {
    width: 60px;
    height: 60px;
    border: 2px solid var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

/* ----------------------------------------------------------
   10. Responsive
   ---------------------------------------------------------- */
@media (max-width: 1024px) {
    .hero-container,
    .about-content,
    .background-grid,
    .project-content {
        grid-template-columns: 1fr;
    }

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

    .hero-name {
        font-size: 3rem;
    }

    .profile-circle {
        width: 350px;
        height: 350px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        gap: 1.5rem;
        font-size: 0.9rem;
    }

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

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

    .project-images {
        grid-template-columns: 1fr;
    }

    .project-number {
        font-size: 3rem;
    }

    .project-title h3 {
        font-size: 1.8rem;
    }

    .contact-item {
        flex-direction: column;
        text-align: center;
        gap: 0.5rem;
    }

    .contact-item strong {
        min-width: unset;
        text-align: center;
    }
}

/* ----------------------------------------------------------
   Project Visual Cards (custom data visualisation previews)
   ---------------------------------------------------------- */

.project-header {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

/* Image grid: 1 tall left + 2 stacked right */
.project-images {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto;
    gap: 1rem;
}

.project-image--main {
    grid-column: 1;
    grid-row: 1 / 3;
}

.project-image--sm {
    grid-column: 2;
}

/* Shared visual container */
.project-visual {
    background: #0f1e3c;
    border: 1px solid rgba(255, 200, 0, 0.15);
    border-radius: 12px;
    padding: 1.4rem 1.2rem 1rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 100%;
    min-height: 190px;
}

.project-visual--main {
    min-height: 400px;
    gap: 1.5rem;
}

.project-visual--sm {
    min-height: 185px;
}

/* KPI row */
.pv-kpi-row {
    display: flex;
    justify-content: space-around;
    gap: 0.5rem;
}

.pv-kpi {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.2rem;
}

.pv-kpi-val {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--gold);
    line-height: 1;
}

.pv-kpi-label {
    font-size: 0.7rem;
    color: rgba(255,255,255,0.5);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Horizontal bar chart */
.pv-bars {
    display: flex;
    flex-direction: column;
    gap: 0.9rem;
    flex: 1;
    justify-content: center;
}

.pv-bar-row {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.pv-bar-label {
    font-size: 0.78rem;
    font-weight: 600;
    min-width: 38px;
    color: rgba(255,255,255,0.8);
}

.pv-bar-track {
    flex: 1;
    height: 10px;
    background: rgba(255,255,255,0.08);
    border-radius: 5px;
    overflow: hidden;
}

.pv-bar-fill {
    height: 100%;
    border-radius: 5px;
    transition: width 0.6s ease;
}

.pv-bar-pct {
    font-size: 0.72rem;
    font-weight: 700;
    min-width: 42px;
    text-align: right;
    color: rgba(255,255,255,0.7);
}

/* Gender vertical bars */
.pv-gender {
    display: flex;
    justify-content: center;
    align-items: flex-end;
    gap: 2.5rem;
    flex: 1;
}

.pv-gender-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.75rem;
    text-align: center;
    color: rgba(255,255,255,0.7);
}

.pv-gender-item strong {
    color: var(--white);
    font-size: 0.9rem;
}

.pv-gender-bar-wrap {
    width: 36px;
    height: 80px;
    background: rgba(255,255,255,0.08);
    border-radius: 4px;
    display: flex;
    align-items: flex-end;
    overflow: hidden;
}

.pv-gender-fill {
    width: 100%;
    border-radius: 4px;
}

/* Satisfaction legend */
.pv-satisfaction {
    display: flex;
    flex-direction: column;
    gap: 0.9rem;
    justify-content: center;
    flex: 1;
}

.pv-sat-row {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    font-size: 0.75rem;
}

.pv-sat-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
}

.pv-sat-red    { background: #e74c3c; }
.pv-sat-yellow { background: #f39c12; }
.pv-sat-green  { background: #2ecc71; }

/* Card bottom label */
.pv-label {
    font-size: 0.7rem;
    text-align: center;
    color: rgba(255,255,255,0.35);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-top: 0.5rem;
}

/* ----------------------------------------------------------
   Modal System
   ---------------------------------------------------------- */

/* Backdrop */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.85);
    z-index: 9000;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    backdrop-filter: blur(6px);
    animation: modalFadeIn 0.2s ease;
}

.modal.is-open {
    display: flex;
}

@keyframes modalFadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}

/* Box */
.modal-box {
    background: #0f1e3c;
    border: 1px solid rgba(255, 200, 0, 0.2);
    border-radius: 16px;
    width: 100%;
    max-width: 860px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    animation: modalSlideUp 0.25s ease;
}

.modal-box--wide {
    max-width: 1200px;
}

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

/* Header */
.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.2rem 1.5rem;
    border-bottom: 1px solid rgba(255, 200, 0, 0.12);
    flex-shrink: 0;
    gap: 1rem;
    flex-wrap: wrap;
}

.modal-header h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--gold);
    margin: 0;
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.modal-slide-counter {
    font-size: 0.85rem;
    font-weight: 400;
    color: rgba(255,255,255,0.5);
    background: rgba(255,255,255,0.06);
    padding: 0.2rem 0.7rem;
    border-radius: 20px;
}

.modal-header-actions {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.modal-download-btn {
    font-family: 'Poppins', sans-serif;
    font-size: 0.82rem;
    font-weight: 600;
    padding: 0.45rem 1rem;
    border-radius: 30px;
    border: 2px solid var(--gold);
    color: var(--gold);
    text-decoration: none;
    background: transparent;
    cursor: pointer;
    transition: all 0.25s;
    white-space: nowrap;
}

.modal-download-btn:hover {
    background: var(--gold);
    color: var(--navy);
}

.modal-close {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 2px solid rgba(255,255,255,0.25);
    background: transparent;
    color: var(--white);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.modal-close:hover {
    border-color: #e74c3c;
    color: #e74c3c;
    background: rgba(231, 76, 60, 0.1);
}

/* Body */
.modal-body {
    overflow-y: auto;
    flex: 1;
    padding: 1.2rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* Dashboard full image */
.modal-full-img {
    width: 100%;
    border-radius: 10px;
    display: block;
}

/* Slide viewer */
.slide-viewer {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.slide-display {
    flex: 1;
    background: #000;
    border-radius: 10px;
    overflow: hidden;
    aspect-ratio: 16 / 9;
    display: flex;
    align-items: center;
    justify-content: center;
}

.slide-display img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
    transition: opacity 0.15s ease;
}

.slide-nav {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 2px solid rgba(255, 200, 0, 0.4);
    background: rgba(255, 200, 0, 0.05);
    color: var(--gold);
    font-size: 1.8rem;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    line-height: 1;
}

.slide-nav:hover {
    background: var(--gold);
    color: var(--navy);
    border-color: var(--gold);
}

.slide-nav:disabled {
    opacity: 0.25;
    cursor: not-allowed;
}

/* Thumbnail strip */
.slide-thumbnails {
    display: flex;
    gap: 0.5rem;
    overflow-x: auto;
    padding: 0.3rem 0 0.5rem;
    scrollbar-width: thin;
    scrollbar-color: rgba(255,200,0,0.3) transparent;
}

.slide-thumbnails::-webkit-scrollbar { height: 4px; }
.slide-thumbnails::-webkit-scrollbar-track { background: transparent; }
.slide-thumbnails::-webkit-scrollbar-thumb { background: rgba(255,200,0,0.3); border-radius: 2px; }

.slide-thumb {
    flex-shrink: 0;
    width: 90px;
    aspect-ratio: 16 / 9;
    border-radius: 5px;
    overflow: hidden;
    cursor: pointer;
    border: 2px solid transparent;
    opacity: 0.55;
    transition: all 0.2s;
}

.slide-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    pointer-events: none;
}

.slide-thumb:hover {
    opacity: 0.85;
    border-color: rgba(255,200,0,0.4);
}

.slide-thumb.active {
    border-color: var(--gold);
    opacity: 1;
}

/* Keyboard hint */
.slide-keyboard-hint {
    text-align: center;
    font-size: 0.72rem;
    color: rgba(255,255,255,0.3);
    padding-bottom: 0.3rem;
}

/* Responsive modals */
@media (max-width: 768px) {
    .modal {
        padding: 0.8rem;
    }
    .modal-box {
        max-height: 95vh;
        border-radius: 12px;
    }
    .slide-nav {
        width: 36px;
        height: 36px;
        font-size: 1.4rem;
    }
    .slide-thumb {
        width: 65px;
    }
}