/* ===================================================================
   TABLE OF CONTENTS
   -------------------------------------------------------------------
   01. CSS Variables & Root Styles
   02. Base & Typography
   03. Layout & Utilities
   04. Buttons
   05. Header & Navigation
   06. Footer
   07. Animations & Effects
   08. Hero Section
   09. Philosophy Section
   10. Services Section
   11. Approach Section (Tabs)
   12. Industries Section
   13. Testimonials Section
   14. FAQ Section (Accordion)
   15. CTA Section
   16. Inner Pages (Contact, Legal)
   17. Media Queries (Responsiveness)
=================================================================== */

/* ===================================================================
   01. CSS Variables & Root Styles
=================================================================== */
:root {
    --color-bg: #F8F9FA;
    --color-white: #FFFFFF;
    --color-dark: #212529;
    --color-grey: #6C757D;
    --color-accent: #005A9C;
    /* A sophisticated, muted blue */
    --color-border: #DEE2E6;

    --font-heading: 'Poppins', sans-serif;
    --font-body: 'Inter', sans-serif;

    --header-height: 80px;
    --border-radius: 6px;
    --transition-speed: 0.3s ease-in-out;
    --container-width: 1140px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--color-bg);
    color: var(--color-dark);
    font-family: var(--font-body);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

/* ===================================================================
   02. Base & Typography
=================================================================== */
h1,
h2,
h3,
h4 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
}

h2 {
    font-size: clamp(2rem, 4vw, 2.75rem);
}

h3 {
    font-size: clamp(1.2rem, 3vw, 1.4rem);
}

p {
    color: var(--color-grey);
    margin-bottom: 1.5rem;
    max-width: 65ch;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color 0.3s;
}

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

ul {
    list-style: none;
}

/* ===================================================================
   03. Layout & Utilities
=================================================================== */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 100px 0;
}

.section:nth-of-type(odd) {
    background-color: var(--color-white);
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 60px;
}

.section-tag {
    display: block;
    color: var(--color-accent);
    font-weight: 600;
    font-size: 0.9rem;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}

/* ===================================================================
   04. Buttons
=================================================================== */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-speed);
    border: 2px solid transparent;
}

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

.btn--primary:hover {
    background-color: var(--color-dark);
    border-color: var(--color-dark);
}

.btn--secondary {
    background-color: transparent;
    color: var(--color-dark);
    border-color: var(--color-dark);
}

.btn--secondary:hover {
    background-color: var(--color-dark);
    color: var(--color-white);
}

.btn--large {
    padding: 16px 40px;
}

.btn--full {
    width: 100%;
}

/* ===================================================================
   05. Header & Navigation
=================================================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    height: var(--header-height);
    background-color: var(--color-white);
    border-bottom: 1px solid transparent;
    transition: background-color 0.4s, border-color 0.4s, box-shadow 0.4s;
}

.header.scrolled,
.header--solid {
    border-color: var(--color-border);
    box-shadow: var(--shadow-sm);
}

.header__container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.header__logo img {
    height: 45px;
    filter: invert(1);
}

.header__nav-list {
    display: flex;
    gap: 40px;
}

.header__nav-link {
    font-weight: 500;
    color: var(--color-dark);
    position: relative;
    padding: 5px 0;
}

.header__nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: width var(--transition-speed);
}

.header__nav-link:hover::after,
.header__nav-link.active::after {
    width: 100%;
}

.header__menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
}

.header__menu-toggle span {
    display: block;
    width: 25px;
    height: 2px;
    background-color: var(--color-dark);
    margin: 5px 0;
    transition: all 0.3s;
}

/* ===================================================================
   06. Footer
=================================================================== */
.footer {
    background-color: var(--color-white);
    border-top: 1px solid var(--color-border);
    padding: 80px 0 30px;
}

.footer p,
.footer li,
.footer a {
    color: var(--color-grey);
}

.footer a:hover {
    color: var(--color-dark);
}

.footer h4 {
    margin-bottom: 1.5rem;
    font-weight: 600;
}

.footer__main {
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: 50px;
    margin-bottom: 60px;
}

.footer__logo {
    margin-bottom: 1rem;
}

.footer__links ul {
    list-style: none;
}

.footer__links li {
    margin-bottom: 1rem;
}

.footer__bottom {
    border-top: 1px solid var(--color-border);
    padding-top: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
}

.footer__socials {
    display: flex;
    gap: 20px;
}

.footer__socials svg {
    width: 20px;
    height: 20px;
    fill: var(--color-grey);
    transition: fill 0.3s;
}

.footer__socials a:hover svg {
    fill: var(--color-dark);
}

/* ===================================================================
   07. Animations & Effects
=================================================================== */
.reveal-up {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
    transition-delay: var(--delay, 0s);
}

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

/* ===================================================================
   08. Hero Section
=================================================================== */
.hero {
    padding-top: var(--header-height);
    background: var(--color-white);
}

.hero__container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    min-height: calc(90vh - var(--header-height));
}

.hero__subtitle {
    font-size: 1.1rem;
    margin: 1.5rem 0 2.5rem;
}

.hero__actions {
    display: flex;
    gap: 20px;
}

.hero__image-wrapper img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--border-radius);
}

/* ===================================================================
   09. Philosophy Section
=================================================================== */
.philosophy {
    background-color: var(--color-bg);
}

.philosophy__container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
}

.philosophy-item h3 {
    margin-bottom: 0.5rem;
}

/* ===================================================================
   10. Services Section
=================================================================== */
.services__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.service-card {
    background-color: var(--color-bg);
    padding: 40px;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    transition: all var(--transition-speed);
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-accent);
}

.service-card__icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-accent);
    color: var(--color-white);
    border-radius: 50%;
    margin-bottom: 1.5rem;
}

.service-card__icon svg {
    width: 24px;
    height: 24px;
}

/* ===================================================================
   11. Approach Section (Tabs)
=================================================================== */
.approach-tabs__nav {
    display: flex;
    gap: 20px;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 40px;
}

.approach-tabs__btn {
    background: none;
    border: none;
    padding: 15px 0;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-grey);
    cursor: pointer;
    position: relative;
}

.approach-tabs__btn::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width var(--transition-speed);
}

.approach-tabs__btn.active {
    color: var(--color-dark);
}

.approach-tabs__btn.active::after {
    width: 100%;
}

.approach-tabs__panel {
    display: none;
}

.approach-tabs__panel.active {
    display: block;
    animation: fadeIn 0.5s;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

/* ===================================================================
   12. Industries Section
=================================================================== */
.industries {
    background-color: var(--color-white);
}

.industries__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    text-align: center;
}

.industry-item {
    background: var(--color-bg);
    padding: 30px;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    font-weight: 600;
}

/* ===================================================================
   13. Testimonials Section
=================================================================== */
.testimonials {
    background-color: var(--color-bg);
}

.testimonials__container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.testimonial-quote {
    font-size: 1.5rem;
    font-family: var(--font-heading);
    line-height: 1.5;
    margin-bottom: 2rem;
}

.author-name {
    display: block;
    font-weight: 700;
}

.author-title {
    font-size: 0.9rem;
    color: var(--color-grey);
}

.testimonial-image img {
    width: 100%;
    display: block;
    border-radius: var(--border-radius);
}

/* ===================================================================
   14. FAQ Section (Accordion)
=================================================================== */
.faq {
    background-color: var(--color-white);
}

.faq__accordion {
    max-width: 800px;
    margin: 0 auto;
}

.accordion-item {
    border-bottom: 1px solid var(--color-border);
}

.accordion-question {
    width: 100%;
    background: none;
    border: none;
    padding: 25px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    text-align: left;
}

.accordion-question span {
    font-size: 1.1rem;
    font-weight: 600;
}

.accordion-question .icon {
    width: 20px;
    height: 20px;
    position: relative;
    transition: transform var(--transition-speed);
}

.accordion-question .icon::before,
.accordion-question .icon::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 14px;
    height: 2px;
    background: var(--color-dark);
    transform: translate(-50%, -50%);
}

.accordion-question .icon::after {
    transform: translate(-50%, -50%) rotate(90deg);
}

.accordion-item.active .accordion-question .icon {
    transform: rotate(135deg);
}

.accordion-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-out;
}

.accordion-answer p {
    padding-bottom: 25px;
}

/* ===================================================================
   15. CTA Section
=================================================================== */
.cta__container {
    background: var(--color-white);
    padding: 60px;
    text-align: center;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
}

.cta__text {
    max-width: 60ch;
    margin-left: auto;
    margin-right: auto;
}

/* ===================================================================
   16. Inner Pages (Contact, Legal)
=================================================================== */
.page-header {
    background: var(--color-white);
    text-align: center;
    padding-top: calc(var(--header-height) + 60px);
    padding-bottom: 60px;
    border-bottom: 1px solid var(--color-border);
}

.contact-page,
.legal-page {
    background-color: var(--color-white);
}

.contact-page__container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 50px;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
}

.contact-info__wrapper ul {
    list-style: none;
}

.contact-info__wrapper li {
    margin-bottom: 1.5rem;
}

.contact-info__wrapper strong {
    display: block;
}

.legal-page h2 {
    margin-top: 2rem;
}

.legal-page ul {
    list-style-type: disc;
    padding-left: 20px;
}

/* ===================================================================
   17. Media Queries (Responsiveness)
=================================================================== */
@media (max-width: 992px) {
    .header__nav {
        position: fixed;
        top: var(--header-height);
        left: -100%;
        width: 100%;
        height: calc(100vh - var(--header-height));
        background-color: var(--color-white);
        flex-direction: column;
        justify-content: center;
        transition: left var(--transition-speed);
    }

    .header__nav.active {
        left: 0;
    }

    .header__nav-list {
        flex-direction: column;
        text-align: center;
        gap: 40px;
    }

    .header__nav-link {
        font-size: 1.5rem;
    }

    .header__menu-toggle {
        display: block;
    }

    .header .btn {
        display: none;
    }

    .hero__container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero__content {
        order: 2;
    }

    .hero__image-wrapper {
        order: 1;
        margin-bottom: 40px;
    }

    .hero__actions {
        justify-content: center;
    }

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

    .testimonial-image {
        display: none;
    }

    .testimonial-content {
        text-align: center;
    }

    .contact-page__container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .footer__main {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer__bottom {
        flex-direction: column;
        gap: 20px;
    }
}