@import url("https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700&display=swap");
@import url("https://fonts.googleapis.com/css2?family=Montserrat:wght@400;500;600;700&display=swap");

/* ============================================================
   CSS VARIABLES
   ============================================================ */
:root {
    --header-height: 4.8rem;
    --z-fixed: 100;

    /* Dark theme (default) */
    --body-color:     #080d1a;
    --card-color:     #0f1629;
    --card-hover:     #152040;
    --accent:         #4f8ef7;
    --accent-alt:     #38bdf8;
    --accent-glow:    rgba(79, 142, 247, 0.22);
    --text:           #cbd5e1;
    --text-light:     #64748b;
    --title:          #f1f5f9;
    --border:         rgba(255, 255, 255, 0.07);
    --shadow:         0 8px 32px rgba(0, 0, 0, 0.45);
    --shadow-card:    0 4px 20px rgba(0, 0, 0, 0.35);
    --header-bg:      rgba(8, 13, 26, 0.88);
    --footer-bg:      #050810;

    /* Typography */
    --font-main: 'Poppins', sans-serif;
    --font-sec:  'Montserrat', sans-serif;

    --fs-hero:  clamp(3rem, 7vw, 5.2rem);
    --fs-h1:    clamp(2rem, 4vw, 3rem);
    --fs-h2:    clamp(1.8rem, 3vw, 2.4rem);
    --fs-h3:    1.8rem;
    --fs-body:  1.6rem;
    --fs-sm:    1.4rem;
    --fs-xs:    1.2rem;

    --fw-normal: 400;
    --fw-medium: 500;
    --fw-semi:   600;
    --fw-bold:   700;

    --section-py: 7rem;
}

/* Light theme overrides */
.light-theme {
    --body-color:   #f0f4fc;
    --card-color:   #ffffff;
    --card-hover:   #f5f8ff;
    --accent:       #2563eb;
    --accent-alt:   #0ea5e9;
    --accent-glow:  rgba(37, 99, 235, 0.15);
    --text:         #374151;
    --text-light:   #6b7280;
    --title:        #111827;
    --border:       rgba(0, 0, 0, 0.08);
    --shadow:       0 8px 32px rgba(0, 0, 0, 0.08);
    --shadow-card:  0 4px 16px rgba(0, 0, 0, 0.07);
    --header-bg:    rgba(240, 244, 252, 0.92);
    --footer-bg:    #1e293b;
}

/* ============================================================
   RESET & BASE
   ============================================================ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 62.5%;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    font-size: var(--fs-body);
    background-color: var(--body-color);
    color: var(--text);
    line-height: 1.7;
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

ul  { list-style: none; }
a   { text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }

h1, h2, h3, h4 {
    color: var(--title);
    font-weight: var(--fw-semi);
    line-height: 1.3;
}

section {
    padding: var(--section-py) 0;
    scroll-margin-top: var(--header-height);
}

/* ============================================================
   LAYOUT
   ============================================================ */
.container {
    max-width: 1100px;
    margin-inline: auto;
    padding-inline: 2.4rem;
}

.section_title {
    font-size: var(--fs-h2);
    color: var(--title);
    text-align: center;
    margin-bottom: 0.6rem;
}

.section_subtitle {
    display: block;
    font-size: var(--fs-sm);
    color: var(--text-light);
    text-align: center;
    margin-bottom: 4.5rem;
}

/* ============================================================
   HEADER / NAV
   ============================================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: var(--z-fixed);
    background: var(--header-bg);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--border);
    transition: background 0.3s;
}

.nav {
    height: var(--header-height);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.nav_logo {
    font-family: var(--font-sec);
    font-weight: var(--fw-bold);
    font-size: 1.7rem;
    color: var(--title);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    transition: color 0.2s;
}
.nav_logo:hover { color: var(--accent); }

.nav_list {
    display: flex;
    align-items: center;
    gap: 2.8rem;
}

.nav_link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: var(--fs-xs);
    font-weight: var(--fw-medium);
    color: var(--text);
    white-space: nowrap;
    transition: color 0.2s;
    position: relative;
    padding-bottom: 0.2rem;
}
.nav_link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    border-radius: 2px;
    transition: width 0.25s ease;
}
.nav_link:hover,
.nav_link.active-link { color: var(--accent); }
.nav_link:hover::after,
.nav_link.active-link::after { width: 100%; }

.nav_icon { font-size: 1rem; }

.nav_btns {
    display: flex;
    align-items: center;
    gap: 1.2rem;
}

.change-theme {
    background: none;
    border: none;
    font-size: 1.8rem;
    color: var(--text);
    cursor: pointer;
    padding: 0.4rem;
    transition: color 0.2s, transform 0.2s;
}
.change-theme:hover {
    color: var(--accent);
    transform: rotate(20deg);
}

.nav_toggle {
    display: none;
    font-size: 2.2rem;
    color: var(--title);
    cursor: pointer;
}

.nav_close {
    display: none;
    position: absolute;
    top: 1.5rem;
    right: 2rem;
    font-size: 2.2rem;
    cursor: pointer;
    color: var(--title);
    transition: color 0.2s;
}
.nav_close:hover { color: var(--accent); }

/* ============================================================
   HERO
   ============================================================ */
.home.section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: calc(var(--header-height) + 4rem);
    position: relative;
    overflow: hidden;
}

/* Ambient glow */
.home.section::before {
    content: '';
    position: absolute;
    top: -15%;
    right: -8%;
    width: 700px;
    height: 700px;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 68%);
    pointer-events: none;
    z-index: 0;
}
.home.section::after {
    content: '';
    position: absolute;
    bottom: -10%;
    left: -5%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(56, 189, 248, 0.1) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

.home_container {
    position: relative;
    z-index: 1;
}

.home_greeting {
    display: inline-block;
    font-size: var(--fs-xs);
    color: var(--accent);
    font-weight: var(--fw-medium);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin-bottom: 1.2rem;
}

.home_title {
    font-size: var(--fs-hero);
    color: var(--title);
    font-weight: var(--fw-bold);
    line-height: 1.15;
    margin-bottom: 1rem;
}

.home_subtitle {
    font-size: var(--fs-h3);
    color: var(--accent);
    font-weight: var(--fw-medium);
    margin-bottom: 2.5rem;
}

.home_description {
    font-size: var(--fs-sm);
    color: var(--text);
    max-width: 600px;
    line-height: 1.85;
    margin-bottom: 3.5rem;
}

.home_actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

/* ============================================================
   BUTTON
   ============================================================ */
.button {
    display: inline-flex;
    align-items: center;
    gap: 0.7rem;
    background: var(--accent);
    color: #fff;
    padding: 1.2rem 2.8rem;
    border-radius: 0.7rem;
    font-size: var(--fs-sm);
    font-weight: var(--fw-semi);
    letter-spacing: 0.03em;
    border: none;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s, filter 0.2s;
    box-shadow: 0 4px 24px var(--accent-glow);
}
.button:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 32px var(--accent-glow);
    filter: brightness(1.08);
    color: #fff;
}
.button_icon { font-size: 1.4rem; }

/* Social icon buttons */
.home_social-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 4.8rem;
    height: 4.8rem;
    border-radius: 0.8rem;
    background: var(--card-color);
    border: 1px solid var(--border);
    color: var(--title);
    font-size: 2rem;
    transition: transform 0.2s, box-shadow 0.2s, color 0.2s, border-color 0.2s;
    box-shadow: var(--shadow-card);
}
.home_social-icon:hover {
    transform: translateY(-4px);
    color: var(--accent);
    border-color: var(--accent);
    box-shadow: 0 8px 28px var(--accent-glow);
}

/* ============================================================
   SERVICES
   ============================================================ */
.services.section {
    padding-top: 0;
}

.services_container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.8rem;
}

.service_card {
    background: var(--card-color);
    border: 1px solid var(--border);
    border-radius: 1.4rem;
    padding: 3rem 2.2rem;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
    box-shadow: var(--shadow-card);
    display: flex;
    flex-direction: column;
    align-items: center;
}
.service_card:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 40px var(--accent-glow);
    border-color: var(--accent);
}

.service_icon {
    font-size: 3.2rem;
    color: var(--accent);
    margin-bottom: 1.8rem;
}

.service_card h3 {
    font-size: var(--fs-sm);
    font-weight: var(--fw-semi);
    margin-bottom: 1rem;
    color: var(--title);
}

.service_card p {
    font-size: var(--fs-xs);
    color: var(--text-light);
    line-height: 1.65;
    flex: 1;
}

.service_tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin-top: 1.8rem;
}
.service_tags span {
    font-size: 1.05rem;
    font-weight: var(--fw-medium);
    padding: 0.3rem 1rem;
    border-radius: 100px;
    background: var(--accent-glow);
    color: var(--accent);
    border: 1px solid rgba(79, 142, 247, 0.2);
}

/* ============================================================
   SKILLS CAROUSEL
   ============================================================ */
.skills_carousel {
    position: relative;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.carousel_track_wrapper {
    overflow: hidden;
    flex: 1;
}

.carousel_track {
    display: flex;
    gap: 1.6rem;
    transition: transform 0.45s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: transform;
}

.skill_item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.2rem;
    background: var(--card-color);
    border: 1px solid var(--border);
    border-radius: 1.2rem;
    padding: 2.5rem 1.5rem;
    min-width: 130px;
    flex-shrink: 0;
    transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
    box-shadow: var(--shadow-card);
    cursor: default;
}
.skill_item:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 32px var(--accent-glow);
    border-color: var(--accent);
}

.skill_logo {
    width: 56px;
    height: 56px;
    object-fit: contain;
    filter: drop-shadow(0 2px 6px rgba(0,0,0,0.3));
    transition: transform 0.3s;
}
.skill_item:hover .skill_logo { transform: scale(1.1); }

.dark-theme .skill_logo_adaptive {
    filter: invert(1) brightness(1.8);
}
.light-theme .skill_logo_adaptive {
    filter: none;
}

.skill_item span {
    font-size: var(--fs-xs);
    font-weight: var(--fw-medium);
    color: var(--text);
    white-space: nowrap;
}

.carousel_btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 3.8rem;
    height: 3.8rem;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: var(--card-color);
    color: var(--title);
    font-size: 1.4rem;
    cursor: pointer;
    flex-shrink: 0;
    transition: background 0.2s, color 0.2s, border-color 0.2s, transform 0.2s;
    box-shadow: var(--shadow-card);
}
.carousel_btn:hover {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
    transform: scale(1.08);
}
.carousel_btn:disabled {
    opacity: 0.3;
    cursor: default;
    transform: none;
}

/* ============================================================
   TIMELINE — EXPÉRIENCES
   ============================================================ */
.timeline_wrapper {
    padding-block: 1rem;
}

.timeline {
    position: relative;
    max-width: 820px;
    margin: 0 auto;
}

/* Vertical center line */
.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--accent), var(--accent-alt));
    transform: translateX(-50%);
    opacity: 0.25;
}

.timeline_item {
    position: relative;
    width: 46%;
    margin-bottom: 3.5rem;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.timeline_item.left  { left: 0;    padding-right: 3.5rem; text-align: right; }
.timeline_item.right { left: 54%;  padding-left:  3.5rem; text-align: left;  }

.timeline_item.left  { transform: translateX(-40px); }
.timeline_item.right { transform: translateX(40px);  }

.timeline_item.left.visible,
.timeline_item.right.visible { transform: translateX(0); }

/* Dot on the line */
.timeline_item::after {
    content: '';
    position: absolute;
    top: 2rem;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 12px var(--accent-glow);
}
.timeline_item.left::after  { right: -7px; }
.timeline_item.right::after { left:  -7px; }

.timeline_content {
    background: var(--card-color);
    border: 1px solid var(--border);
    border-radius: 1.2rem;
    padding: 2rem 2.2rem;
    transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
    box-shadow: var(--shadow-card);
}
.timeline_content:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 30px var(--accent-glow);
    border-color: var(--accent);
}

.timeline_tag {
    display: inline-block;
    font-size: 1rem;
    font-weight: var(--fw-semi);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    padding: 0.35rem 1.1rem;
    border-radius: 100px;
    margin-bottom: 1rem;
}
.timeline_tag.edu {
    background: rgba(79, 142, 247, 0.12);
    color: var(--accent);
    border: 1px solid rgba(79, 142, 247, 0.3);
}
.timeline_tag.work {
    background: rgba(56, 189, 248, 0.12);
    color: var(--accent-alt);
    border: 1px solid rgba(56, 189, 248, 0.3);
}

.timeline_content h3 {
    font-size: var(--fs-sm);
    color: var(--title);
    margin-bottom: 0.4rem;
}

.timeline_content p {
    font-size: var(--fs-xs);
    color: var(--text-light);
    margin-bottom: 1rem;
}

.timeline_date {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.1rem;
    color: var(--text-light);
}
.timeline_item.left .timeline_date { justify-content: flex-end; }

/* ============================================================
   PROJETS
   ============================================================ */
.project_grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
}

.project_card {
    display: block;
    background: var(--card-color);
    border: 1px solid var(--border);
    border-radius: 1.4rem;
    overflow: hidden;
    transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
    box-shadow: var(--shadow-card);
    color: var(--text);
}
.project_card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 50px var(--accent-glow);
    border-color: var(--accent);
}

.project_thumb {
    height: 200px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1.8rem;
    position: relative;
    overflow: hidden;
}
.project_thumb--java   { background: linear-gradient(135deg, #0d1b2a 0%, #1a3a5c 100%); }
.project_thumb--web    { background: linear-gradient(135deg, #0d1f1a 0%, #1a4a35 100%); }
.project_thumb--slides { background: #000; padding: 0; overflow: hidden; }

.project_slides {
    display: flex;
    width: 100%;
    height: 100%;
    transition: transform 0.6s ease;
}
.project_slides img {
    min-width: 100%;
    height: 200px;
    object-fit: cover;
    object-position: top;
}

.project_thumb::before {
    content: '';
    position: absolute;
    width: 180px;
    height: 180px;
    border-radius: 50%;
    background: rgba(255,255,255,0.04);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.project_thumb_icons {
    display: flex;
    align-items: center;
    gap: 1.6rem;
    position: relative;
    z-index: 1;
}
.project_thumb_icons img {
    width: 52px;
    height: 52px;
    object-fit: contain;
    filter: drop-shadow(0 4px 10px rgba(0,0,0,0.5));
    transition: transform 0.3s;
}
.project_card:hover .project_thumb_icons img { transform: translateY(-4px); }

.project_thumb_label {
    font-size: 1.1rem;
    font-weight: var(--fw-medium);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: rgba(255,255,255,0.45);
    position: relative;
    z-index: 1;
}

.project_info { padding: 2.2rem; }

.project_info_top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 0.8rem;
}
.project_info_top h3 {
    font-size: var(--fs-h3);
    color: var(--title);
}
.project_badge {
    font-size: 1rem;
    font-weight: var(--fw-semi);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    padding: 0.3rem 1rem;
    border-radius: 100px;
    background: var(--accent-glow);
    color: var(--accent);
    border: 1px solid rgba(79, 142, 247, 0.3);
    white-space: nowrap;
    flex-shrink: 0;
}
.project_info p {
    font-size: var(--fs-xs);
    color: var(--text-light);
    margin-bottom: 1.8rem;
    line-height: 1.6;
}
.project_link {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    font-size: var(--fs-xs);
    color: var(--accent);
    font-weight: var(--fw-medium);
    transition: gap 0.2s;
}
.project_card:hover .project_link { gap: 1rem; }

/* ============================================================
   CONTACT
   ============================================================ */
.contact_container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 2rem;
}

.contact_card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 1.2rem;
    background: var(--card-color);
    border: 1px solid var(--border);
    border-radius: 1.4rem;
    padding: 3.5rem 2.5rem;
    box-shadow: var(--shadow-card);
    transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
}
.contact_card:hover {
    transform: translateY(-5px);
    box-shadow: 0 14px 36px var(--accent-glow);
    border-color: var(--accent);
}

.contact_icon {
    font-size: 3rem;
    color: var(--accent);
}
.contact_card h3 {
    font-size: var(--fs-sm);
    font-weight: var(--fw-semi);
    color: var(--title);
}
.contact_card span {
    font-size: var(--fs-xs);
    color: var(--text-light);
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
    background: var(--footer-bg);
    border-top: 1px solid rgba(255,255,255,0.05);
    padding: 5rem 0 2.5rem;
}

.footer_inner {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 2rem;
    margin-bottom: 3.5rem;
    flex-wrap: wrap;
}

.footer_title {
    font-size: var(--fs-h3);
    color: #f1f5f9;
    margin-bottom: 0.4rem;
}
.footer_subtitle {
    font-size: var(--fs-xs);
    color: #64748b;
}

.footer_links {
    display: flex;
    gap: 2.5rem;
    flex-wrap: wrap;
    align-items: center;
}
.footer_link {
    font-size: var(--fs-xs);
    color: #94a3b8;
    transition: color 0.2s;
}
.footer_link:hover { color: var(--accent); }

.footer_copy {
    text-align: center;
    font-size: var(--fs-xs);
    color: #475569;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.05);
}

/* ============================================================
   RESPONSIVE — Mobile first
   ============================================================ */

/* ---- Mobile nav (< 768px) ---- */
@media screen and (max-width: 767px) {
    .nav_toggle { display: block; }
    .nav_close  { display: block; }

    .nav_menu {
        position: fixed;
        bottom: -100%;
        left: 0;
        width: 100%;
        background: var(--card-color);
        border-top: 1px solid var(--border);
        padding: 3rem 2.5rem 4.5rem;
        border-radius: 2rem 2rem 0 0;
        box-shadow: 0 -8px 32px rgba(0,0,0,0.25);
        transition: bottom 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
        z-index: var(--z-fixed);
    }
    .nav_menu.show-menu { bottom: 0; }

    .nav_list {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 2rem;
        text-align: center;
    }
    .nav_link {
        flex-direction: column;
        font-size: 1.1rem;
        gap: 0.4rem;
    }
    .nav_icon { font-size: 1.6rem; }
    .nav_link::after { display: none; }

    /* Hero */
    .home.section {
        min-height: auto;
        padding-top: calc(var(--header-height) + 3rem);
        padding-bottom: 5rem;
    }

    /* Timeline → single column */
    .timeline::before { left: 1.5rem; transform: none; }

    .timeline_item {
        width: 100%;
        left: 0 !important;
        padding-left: 4.5rem;
        padding-right: 0;
        text-align: left;
        transform: translateX(-30px);
    }
    .timeline_item.visible { transform: translateX(0); }
    .timeline_item::after {
        left: 0.72rem !important;
        right: auto !important;
    }
    .timeline_item.left .timeline_date { justify-content: flex-start; }

    /* Services 2 cols on small screens */
    .services_container {
        grid-template-columns: 1fr 1fr;
    }
}

/* ---- Tablet ---- */
@media screen and (min-width: 768px) {
    body { margin: 0; }
}

/* ---- Small mobile adjustments ---- */
@media screen and (max-width: 480px) {
    :root { --section-py: 5rem; }

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

    .skills_grid { grid-template-columns: repeat(3, 1fr); }

    .home_actions { gap: 1.2rem; }
}