/* =========================================================
   1. COLOR PALETTE
   ========================================================= */

:root {

    --primary-color: #507DBC;
    --header-color: #6F98CC;
    --secondary-color: #507DBC;

    --accent-color: #A1C6EA;
    --soft-accent-color: #BBD1EA;
    --pale-color: #DAE3E5;

    --light-bg-color: #F8FAFB;
    --white-color: #FFFFFF;
    --card-bg-color: #FFFFFF;

    --dark-text-color: #1F2933;
    --light-text-color: #5F6B76;

    --font-heading: 'Playfair Display', serif;
    --font-body: 'Lato', sans-serif;
}


/* =========================================================
   2. RESET
   ========================================================= */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}


html {
    scroll-behavior: smooth;
}


body {

    font-family: var(--font-body);

    font-weight: 400;

    line-height: 1.8;

    background-color: var(--light-bg-color);

    color: var(--dark-text-color);

    overflow-x: hidden;
}


.container {

    width: 90%;

    max-width: 1100px;

    margin: 0 auto;

    padding: 0 20px;
}


a {

    text-decoration: none;

    color: var(--primary-color);

    transition: all 0.3s ease;
}


a:hover {
    opacity: 0.9;
}


img {

    max-width: 100%;

    display: block;
}


/* =========================================================
   3. HEADER
   ========================================================= */

header {

    background-color: var(--header-color);

    color: var(--white-color);

    padding: 70px 0;

    text-align: center;
}


header h1 {

    font-family: var(--font-heading);

    font-size: 4rem;

    font-weight: 700;

    margin-bottom: 15px;

    letter-spacing: 1px;

    color: var(--white-color);
}


header p {

    font-size: 1.3rem;

    font-weight: 300;

    color: var(--white-color);

    opacity: 0.95;

    margin-bottom: 35px;
}


/* =========================================================
   4. SOCIAL LINKS
   ========================================================= */

.social-links a {

    color: var(--white-color);

    font-size: 1.6rem;

    margin: 0 15px;

    display: inline-block;

    transition:
        transform 0.3s ease,
        color 0.3s ease;
}


.social-links a:hover {

    color: var(--pale-color);

    transform: translateY(-3px);
}


/* =========================================================
   5. NAVIGATION
   ========================================================= */

nav {

    background-color: var(--secondary-color);

    position: sticky;

    top: 0;

    z-index: 1000;

    border-bottom: 1px solid var(--accent-color);
}


nav ul {

    display: flex;

    justify-content: center;

    align-items: center;

    list-style: none;

    padding: 10px 0;

    flex-wrap: wrap;
}


nav ul li a {

    color: var(--white-color);

    font-weight: 400;

    padding: 15px 25px;

    font-size: 1rem;

    letter-spacing: 0.5px;

    position: relative;
}


nav ul li a::after {

    content: '';

    position: absolute;

    bottom: 10px;

    left: 50%;

    transform: translateX(-50%);

    width: 0;

    height: 2px;

    background-color: var(--accent-color);

    transition: width 0.4s ease;
}


nav ul li a:hover::after {
    width: 50%;
}


/* =========================================================
   6. SECTIONS
   ========================================================= */

.section {
    padding: 100px 0;
}


.section:nth-of-type(even) {
    background-color: #F3F7FA;
}


.section h2 {

    text-align: center;

    font-family: var(--font-heading);

    font-size: 3rem;

    font-weight: 700;

    margin-bottom: 70px;

    position: relative;

    color: var(--dark-text-color);
}


.section h2::after {

    content: '';

    position: absolute;

    bottom: -20px;

    left: 50%;

    transform: translateX(-50%);

    width: 70px;

    height: 3px;

    background-color: var(--primary-color);
}


/* =========================================================
   7. ABOUT
   ========================================================= */

.about-content {

    display: flex;

    align-items: center;

    gap: 60px;

    max-width: 960px;

    margin: 0 auto;

    text-align: left;
}


.profile-photo {

    width: 280px;

    height: 280px;

    border-radius: 50%;

    object-fit: cover;

    flex-shrink: 0;

    border: 7px solid var(--white-color);

    box-shadow:
        0 10px 30px rgba(31, 41, 51, 0.12);
}


.about-text {
    flex: 1;
}


.about-text p {

    font-size: 1.1rem;

    margin-bottom: 15px;

    line-height: 1.9;
}


/* =========================================================
   8. PROJECTS
   ========================================================= */

.projects-container {

    width: 92%;

    max-width: 1100px;
}


/*
   IMPORTANT:
   Two columns are forced here.

   Project 1 | Project 2
   Project 3 | Project 4
*/

.projects-grid {

    display: grid !important;

    grid-template-columns:
        minmax(0, 1fr)
        minmax(0, 1fr) !important;

    gap: 40px;

    width: 100%;

    align-items: stretch;
}


/* Individual card */

.project-card {

    width: 100%;

    min-width: 0;

    background-color: var(--card-bg-color);

    border-radius: 8px;

    overflow: hidden;

    border: 1px solid #E2E8EE;

    box-shadow:
        0 8px 25px rgba(31, 41, 51, 0.06);

    transition:
        transform 0.4s ease,
        box-shadow 0.4s ease;

    display: flex;

    flex-direction: column;
}


.project-card:hover {

    transform: translateY(-8px);

    box-shadow:
        0 20px 40px rgba(31, 41, 51, 0.13);
}


/* =========================================================
   PROJECT IMAGES
   ========================================================= */

/* Base project image style */
.project-image {
    width: 100%;
    max-width: 100%;
    display: block;
    background-color: #FFFFFF;
}

/* Project 1 and Project 2 */
.project-card:not(.project-card-three):not(.project-card-four) .project-image {
    height: 250px;
    object-fit: cover;
    object-position: center;
}

/* Project 3 Power BI dashboard */
.project-card-three .project-3-image {
    width: 100% !important;
    height: auto !important;
    max-height: none !important;
    object-fit: contain !important;
    object-position: center !important;
    margin: 0;
    padding: 0;
}

/* Project 4 infographic */
.project-card-four .project-4-image {
    width: 100% !important;
    height: auto !important;
    max-height: none !important;
    object-fit: contain !important;
    object-position: center !important;
    margin: 0;
    padding: 0;
}


/* =========================================================
   PROJECT CONTENT
   ========================================================= */

.project-card-content {

    padding: 30px;

    flex: 1;

    display: flex;

    flex-direction: column;
}


.project-card-content h3 {

    font-family: var(--font-heading);

    font-size: 1.8rem;

    line-height: 1.4;

    margin-bottom: 15px;

    color: var(--dark-text-color);
}


.project-card-content p {

    color: var(--light-text-color);

    margin-bottom: 30px;

    flex-grow: 1;

    line-height: 1.8;
}


/* =========================================================
   PROJECT BUTTONS
   ========================================================= */

.project-buttons {

    display: flex;

    gap: 15px;

    margin-top: auto;
}


/* =========================================================
   9. BUTTONS
   ========================================================= */

.btn {

    display: inline-flex;

    align-items: center;

    justify-content: center;

    background-color: var(--primary-color);

    color: var(--white-color);

    padding: 12px 20px;

    border-radius: 5px;

    font-weight: 700;

    text-align: center;

    transition: all 0.3s ease;

    flex: 1;

    letter-spacing: 0.3px;

    border: 2px solid var(--primary-color);

    cursor: pointer;
}


.btn:hover {

    background-color: #3F669E;

    border-color: #3F669E;

    color: var(--white-color);

    transform: translateY(-2px);
}


.btn-secondary {

    background-color: transparent;

    color: var(--primary-color);

    border: 2px solid var(--primary-color);
}


.btn-secondary:hover {

    background-color: var(--accent-color);

    border-color: var(--accent-color);

    color: var(--dark-text-color);
}


/* =========================================================
   10. SKILLS
   ========================================================= */

#skills .container {
    max-width: 1100px;
}


.skills-table {

    display: grid;

    grid-template-columns: repeat(3, 1fr);

    gap: 20px;

    margin-top: 50px;

    background-color: var(--card-bg-color);

    padding: 40px;

    border-radius: 8px;

    border: 1px solid #E2E8EE;

    box-shadow:
        0 10px 40px rgba(31, 41, 51, 0.07);
}


.skill-column {
    padding: 0 20px;
}


.skill-column:not(:last-child) {
    border-right: 1px solid var(--soft-accent-color);
}


.skill-header {

    display: flex;

    align-items: center;

    margin-bottom: 25px;
}


.skill-header i {

    font-size: 2rem;

    color: var(--primary-color);

    margin-right: 15px;

    width: 40px;
}


.skill-header h3 {

    font-family: var(--font-heading);

    font-size: 1.7rem;

    color: var(--dark-text-color);
}


.skill-list {

    list-style: none;

    padding-left: 0;
}


.skill-list li {

    padding: 12px 0 12px 25px;

    font-size: 1.05rem;

    color: var(--dark-text-color);

    border-bottom: 1px solid #E6EDF3;

    position: relative;
}


.skill-list li::before {

    content: '›';

    position: absolute;

    left: 0;

    top: 12px;

    color: var(--primary-color);

    font-weight: 700;

    font-size: 1.2rem;
}


.skill-list li:last-child {
    border-bottom: none;
}


/* =========================================================
   11. CONTACT FORM
   ========================================================= */

#contact .container {
    max-width: 800px;
}


.contact-form {

    max-width: 700px;

    margin: 0 auto;

    background-color: var(--card-bg-color);

    padding: 40px;

    border-radius: 8px;

    border: 1px solid #E2E8EE;

    box-shadow:
        0 10px 40px rgba(31, 41, 51, 0.07);
}


.contact-form > p {

    margin-bottom: 30px;

    color: var(--light-text-color);
}


.form-group {
    margin-bottom: 25px;
}


.contact-form label {

    display: block;

    margin-bottom: 8px;

    font-weight: 500;

    font-size: 1rem;

    color: var(--dark-text-color);
}


.contact-form input,
.contact-form textarea {

    width: 100%;

    padding: 15px;

    border: 1px solid var(--soft-accent-color);

    border-radius: 5px;

    font-family: var(--font-body);

    font-size: 1rem;

    background-color: var(--white-color);

    transition:
        border-color 0.3s ease,
        box-shadow 0.3s ease;
}


.contact-form input:focus,
.contact-form textarea:focus {

    outline: none;

    border-color: var(--primary-color);

    box-shadow:
        0 0 0 3px rgba(80, 125, 188, 0.18);
}


.contact-form button.btn {

    width: 100%;

    padding: 15px;

    font-size: 1.1rem;

    border: none;
}


/* =========================================================
   12. FOOTER
   ========================================================= */

footer {

    background-color: var(--primary-color);

    color: var(--white-color);

    text-align: center;

    padding: 40px 0;

    margin-top: 80px;
}


footer p {
    opacity: 0.85;
}


/* =========================================================
   13. TABLET
   ========================================================= */

@media (max-width: 992px) {

    .container {
        width: 94%;
    }


    /*
       KEEP PROJECTS AT TWO COLUMNS
       even on tablets.
    */

    .projects-grid {

        grid-template-columns:
            minmax(0, 1fr)
            minmax(0, 1fr) !important;

        gap: 24px;
    }


    .project-card-content {
        padding: 24px;
    }


    .project-card-content h3 {
        font-size: 1.6rem;
    }


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


    .skill-column:nth-child(2) {
        border-right: none;
    }
}


/* =========================================================
   14. SMALL TABLET
   ========================================================= */

@media (max-width: 768px) {

    header h1 {
        font-size: 2.8rem;
    }


    .about-content {

        flex-direction: column;

        text-align: center;
    }


    /*
       STILL TWO COLUMNS HERE.
       This prevents premature stacking.
    */

    .projects-grid {

        grid-template-columns:
            minmax(0, 1fr)
            minmax(0, 1fr) !important;

        gap: 18px;
    }


    .project-card-content {
        padding: 20px;
    }


    .project-card-content h3 {
        font-size: 1.4rem;
    }


    .project-buttons {

        gap: 10px;

        flex-direction: column;
    }


    .project-card:not(.project-card-three):not(.project-card-four) .project-image {
        height: 200px;
    }


    .skills-table {

        grid-template-columns: 1fr;

        padding: 20px;

        gap: 40px;
    }


    .skill-column:not(:last-child) {

        border-right: none;

        border-bottom:
            1px solid var(--soft-accent-color);

        padding-bottom: 30px;
    }
}


/* =========================================================
   15. MOBILE
   ========================================================= */

/*
   Cards only stack when the screen is actually small.
*/

@media (max-width: 520px) {

    header {

        padding: 50px 0;
    }


    header h1 {
        font-size: 2.4rem;
    }


    header p {
        font-size: 1.05rem;
    }


    nav ul li a {

        padding: 12px 10px;

        font-size: 0.9rem;
    }


    .section {
        padding: 70px 0;
    }


    .section h2 {

        font-size: 2.3rem;

        margin-bottom: 55px;
    }


    /*
       Only here do projects stack.
    */

    .projects-grid {

        grid-template-columns: 1fr !important;

        gap: 30px;
    }


    .project-card-content {

        padding: 25px;
    }


    .project-buttons {

        flex-direction: column;
    }


    .project-card:not(.project-card-three):not(.project-card-four) .project-image {
        height: 220px;
    }


    .profile-photo {

        width: 220px;

        height: 220px;
    }


    .contact-form {

        padding: 25px;
    }
}