/* ===== 1. CSS Custom Properties ===== */
:root {
    /* Colors */
    --color-navy: #0A1628;
    --color-navy-deep: #060F1D;
    --color-slate: #1B2D4A;
    --color-accent: #2D7FF9;
    --color-accent-hover: #1A6AE0;
    --color-teal: #00C9A7;
    --color-light: #F8F9FB;
    --color-white: #FFFFFF;
    --color-text-light: #F0F2F5;
    --color-text-muted: #94A3B8;
    --color-text-dark: #1A1A2E;
    --color-border: #2A3A5C;

    /* Typography */
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
    --font-size-hero: clamp(2.5rem, 5vw, 4rem);
    --font-size-h2: clamp(1.75rem, 3vw, 2.5rem);
    --font-size-h3: clamp(1.125rem, 2vw, 1.375rem);
    --font-size-body: clamp(1rem, 1.25vw, 1.125rem);
    --font-size-small: 0.875rem;

    /* Spacing */
    --section-padding: clamp(4rem, 8vw, 7rem);
    --container-max: 1200px;
    --container-padding: 1.5rem;

    /* Transitions */
    --transition: 0.3s ease;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.2);

    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;

    /* Header */
    --header-height: 4.5rem;
}

/* ===== 2. Reset & Base ===== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-height);
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-body);
    line-height: 1.6;
    color: var(--color-text-dark);
    background-color: var(--color-navy);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition);
}

ul[role="list"] {
    list-style: none;
}

address {
    font-style: normal;
}

/* ===== 3. Utility Classes ===== */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin-inline: auto;
    padding-inline: var(--container-padding);
}

.section-title {
    font-size: var(--font-size-h2);
    font-weight: 700;
    color: var(--color-text-dark);
    text-align: center;
    margin-bottom: 3rem;
}

.section-title--light {
    color: var(--color-text-light);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 2rem;
    font-family: var(--font-family);
    font-size: 1rem;
    font-weight: 600;
    border: 2px solid transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
    line-height: 1;
}

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

.btn--primary:hover,
.btn--primary:focus-visible {
    background-color: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn--outline {
    background-color: transparent;
    color: var(--color-text-light);
    border-color: var(--color-text-light);
}

.btn--outline:hover,
.btn--outline:focus-visible {
    background-color: var(--color-text-light);
    color: var(--color-navy);
    transform: translateY(-1px);
}

.btn--sm {
    padding: 0.625rem 1.5rem;
    font-size: var(--font-size-small);
}

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

.btn:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* Button loading state */
.btn__loading {
    display: none;
}

.btn--loading .btn__text {
    display: none;
}

.btn--loading .btn__loading {
    display: inline;
}

.btn--loading {
    opacity: 0.7;
    pointer-events: none;
}

/* ===== 4. Navigation ===== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--header-height);
    transition: background-color var(--transition), box-shadow var(--transition);
}

.site-header.nav-scrolled {
    background-color: var(--color-navy);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

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

.nav__logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text-light);
    white-space: nowrap;
}

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

.nav__menu {
    display: flex;
    align-items: center;
    gap: 2rem;
    list-style: none;
}

.nav__link {
    color: var(--color-text-muted);
    font-weight: 500;
    font-size: var(--font-size-small);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    position: relative;
    padding: 0.25rem 0;
}

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

.nav__link:hover,
.nav__link:focus-visible {
    color: var(--color-text-light);
}

.nav__link:hover::after,
.nav__link:focus-visible::after {
    width: 100%;
}

/* Hamburger */
.nav__toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 2rem;
    height: 2rem;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
}

.nav__toggle-bar {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--color-text-light);
    border-radius: 2px;
    transition: all var(--transition);
    transform-origin: center;
}

/* Mobile nav open state */
.nav-open .nav__toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav-open .nav__toggle-bar:nth-child(2) {
    opacity: 0;
}

.nav-open .nav__toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ===== 5. Hero Section ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background-color: var(--color-navy);
    background-image:
        radial-gradient(ellipse at 20% 50%, rgba(45, 127, 249, 0.08) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 20%, rgba(0, 201, 167, 0.06) 0%, transparent 50%);
    padding-top: var(--header-height);
}

.hero__content {
    text-align: center;
    max-width: 800px;
    margin-inline: auto;
    padding-block: 4rem;
}

.hero__title {
    font-size: var(--font-size-hero);
    font-weight: 700;
    color: var(--color-text-light);
    line-height: 1.15;
    margin-bottom: 1.5rem;
}

.hero__subtitle {
    font-size: clamp(1.125rem, 2vw, 1.375rem);
    color: var(--color-text-muted);
    line-height: 1.7;
    margin-bottom: 2.5rem;
    max-width: 600px;
    margin-inline: auto;
}

.hero__cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== 6. About Section ===== */
.about {
    background-color: var(--color-light);
    padding-block: var(--section-padding);
}

.about__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
}

.about__text p {
    margin-bottom: 1.25rem;
    color: #475569;
    line-height: 1.8;
}

.about__text p:last-child {
    margin-bottom: 0;
}

.about__values {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.value-card {
    background-color: var(--color-white);
    padding: 1.75rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition), box-shadow var(--transition);
}

.value-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.value-card__icon {
    width: 3rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(45, 127, 249, 0.1);
    border-radius: var(--radius-sm);
    color: var(--color-accent);
    margin-bottom: 1rem;
}

.value-card__title {
    font-size: var(--font-size-h3);
    font-weight: 600;
    color: var(--color-text-dark);
    margin-bottom: 0.5rem;
}

.value-card__text {
    font-size: var(--font-size-small);
    color: #64748B;
    line-height: 1.6;
}

/* ===== 7. Our Apps Section ===== */
.apps {
    background-color: var(--color-slate);
    padding-block: var(--section-padding);
}

.apps__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    max-width: 800px;
    margin-inline: auto;
}

.app-card {
    background-color: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    display: flex;
    gap: 2rem;
    align-items: flex-start;
    transition: transform var(--transition), box-shadow var(--transition);
}

.app-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    background-color: rgba(255, 255, 255, 0.08);
}

.app-card__icon {
    flex-shrink: 0;
    width: 5rem;
    height: 5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-accent), var(--color-teal));
    border-radius: 1.25rem;
    color: var(--color-white);
}

.app-card__name {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-light);
    margin-bottom: 0.25rem;
}

.app-card__tagline {
    font-size: 1rem;
    color: var(--color-teal);
    font-weight: 500;
    margin-bottom: 1rem;
}

.app-card__description {
    color: var(--color-text-muted);
    margin-bottom: 1.25rem;
    line-height: 1.7;
}

.app-card__badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-accent);
    background-color: rgba(45, 127, 249, 0.12);
    border-radius: 100px;
    letter-spacing: 0.02em;
}

/* ===== 8. Contact Section ===== */
.contact {
    background-color: var(--color-navy);
    padding-block: var(--section-padding);
}

.contact__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
}

.contact__info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.contact__item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    color: var(--color-text-muted);
}

.contact__item svg {
    flex-shrink: 0;
    margin-top: 0.25rem;
    color: var(--color-accent);
}

.contact__item h3 {
    font-size: var(--font-size-small);
    font-weight: 600;
    color: var(--color-text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.25rem;
}

.contact__item a {
    color: var(--color-text-muted);
}

.contact__item a:hover,
.contact__item a:focus-visible {
    color: var(--color-accent);
}

.contact__item address {
    line-height: 1.7;
}

/* Contact Form */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.contact-form__honeypot {
    position: absolute;
    left: -9999px;
    opacity: 0;
    height: 0;
    width: 0;
    overflow: hidden;
}

.contact-form__label {
    display: block;
    font-size: var(--font-size-small);
    font-weight: 600;
    color: var(--color-text-light);
    margin-bottom: 0.5rem;
}

.contact-form__input {
    width: 100%;
    padding: 0.875rem 1rem;
    font-family: var(--font-family);
    font-size: 1rem;
    color: var(--color-text-light);
    background-color: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    transition: border-color var(--transition), background-color var(--transition);
}

.contact-form__input::placeholder {
    color: #4A5A7A;
}

.contact-form__input:focus {
    outline: none;
    border-color: var(--color-accent);
    background-color: rgba(255, 255, 255, 0.1);
}

.contact-form__input:invalid:not(:placeholder-shown) {
    border-color: #EF4444;
}

.contact-form__textarea {
    resize: vertical;
    min-height: 8rem;
}

.contact-form__status {
    font-size: var(--font-size-small);
    min-height: 1.5rem;
}

.contact-form__status--success {
    color: var(--color-teal);
}

.contact-form__status--error {
    color: #EF4444;
}

/* ===== 9. Footer ===== */
.footer {
    background-color: var(--color-navy-deep);
    padding-top: 4rem;
    padding-bottom: 2rem;
    border-top: 1px solid var(--color-border);
}

.footer__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2.5rem;
    padding-bottom: 3rem;
    border-bottom: 1px solid var(--color-border);
}

.footer__logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text-light);
    display: inline-block;
    margin-bottom: 0.75rem;
}

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

.footer__tagline {
    color: var(--color-text-muted);
    font-size: var(--font-size-small);
    line-height: 1.7;
    max-width: 300px;
}

.footer__heading {
    font-size: var(--font-size-small);
    font-weight: 600;
    color: var(--color-text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
}

.footer__links ul,
.footer__contact ul {
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
}

.footer__links a,
.footer__contact a {
    color: var(--color-text-muted);
    font-size: var(--font-size-small);
}

.footer__links a:hover,
.footer__links a:focus-visible,
.footer__contact a:hover,
.footer__contact a:focus-visible {
    color: var(--color-accent);
}

.footer__contact address {
    color: var(--color-text-muted);
    font-size: var(--font-size-small);
    line-height: 1.7;
}

.footer__bottom {
    padding-top: 2rem;
    text-align: center;
}

.footer__bottom p {
    color: var(--color-text-muted);
    font-size: var(--font-size-small);
}

/* ===== 10. Animations ===== */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    html {
        scroll-behavior: auto;
    }

    .animate-on-scroll {
        opacity: 1;
        transform: none;
        transition: none;
    }
}

/* ===== 11. Legal Pages ===== */
.legal-content {
    max-width: 800px;
    margin-inline: auto;
    padding-block: var(--section-padding);
    color: #475569;
}

.legal-content h1 {
    font-size: var(--font-size-h2);
    color: var(--color-text-dark);
    margin-bottom: 0.5rem;
}

.legal-content .legal-date {
    font-size: var(--font-size-small);
    color: #64748B;
    margin-bottom: 2.5rem;
}

.legal-content h2 {
    font-size: var(--font-size-h3);
    color: var(--color-text-dark);
    margin-top: 2.5rem;
    margin-bottom: 1rem;
}

.legal-content p {
    margin-bottom: 1rem;
    line-height: 1.8;
}

.legal-content ul {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
}

.legal-content li {
    margin-bottom: 0.5rem;
    line-height: 1.7;
}

.legal-content a {
    color: var(--color-accent);
}

.legal-content a:hover {
    text-decoration: underline;
}

/* Legal page overrides */
.legal-page {
    background-color: var(--color-light);
}

.legal-page .site-header {
    background-color: var(--color-navy);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

/* ===== 12. Media Queries ===== */

/* Mobile nav */
@media (max-width: 767px) {
    .nav__toggle {
        display: flex;
    }

    .nav__menu {
        position: fixed;
        top: 0;
        right: 0;
        width: min(300px, 80vw);
        height: 100vh;
        flex-direction: column;
        justify-content: center;
        gap: 2.5rem;
        background-color: var(--color-navy-deep);
        padding: 2rem;
        transform: translateX(100%);
        transition: transform var(--transition);
        box-shadow: -10px 0 30px rgba(0, 0, 0, 0.3);
    }

    .nav-open .nav__menu {
        transform: translateX(0);
    }

    .nav__link {
        font-size: 1.125rem;
    }

    /* Overlay */
    .nav-open::after {
        content: '';
        position: fixed;
        inset: 0;
        background-color: rgba(0, 0, 0, 0.5);
        z-index: 999;
    }

    .nav__toggle {
        z-index: 1001;
    }

    .nav__menu {
        z-index: 1000;
    }
}

/* Tablet and up */
@media (min-width: 768px) {
    .about__grid {
        grid-template-columns: 1fr 1fr;
        align-items: start;
    }

    .contact__grid {
        grid-template-columns: 1fr 1fr;
        align-items: start;
    }

    .footer__grid {
        grid-template-columns: 2fr 1fr 1fr;
    }

    .app-card {
        flex-direction: row;
    }
}

/* Mobile stacking for app cards */
@media (max-width: 599px) {
    .app-card {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .app-card__badges {
        justify-content: center;
    }

    .app-card__content {
        display: flex;
        flex-direction: column;
        align-items: center;
    }
}

/* Desktop */
@media (min-width: 1024px) {
    :root {
        --container-padding: 2rem;
    }
}