/* =============================================
   Paperbak Labs - Styles
   ============================================= */

/* CSS Custom Properties */
:root {
    /* Colors */
    --primary: #4A90D9;
    --primary-dark: #3A7BC8;
    --primary-light: #6BA3E0;
    --gray-900: #111827;
    --gray-700: #374151;
    --gray-600: #4B5563;
    --gray-400: #9CA3AF;
    --gray-200: #E5E7EB;
    --gray-100: #F3F4F6;
    --gray-50: #F9FAFB;
    --white: #FFFFFF;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-base: 1rem;
    --font-size-sm: 0.875rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    /* Layout */
    --max-width: 1200px;
    --header-height: 72px;

    /* Effects */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --transition: 150ms ease-in-out;
    --border-radius: 8px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--gray-700);
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

/* Container */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* =============================================
   Header & Navigation
   ============================================= */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: var(--white);
    border-bottom: 1px solid var(--gray-200);
    z-index: 1000;
}

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

.nav__logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.nav__logo-img {
    width: 40px;
    height: 40px;
}

.nav__logo-text {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--gray-900);
}

.nav__menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav__link {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--gray-600);
    transition: color var(--transition);
}

.nav__link:hover {
    color: var(--primary);
}

.nav__toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 32px;
    height: 32px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav__toggle-bar {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--gray-700);
    border-radius: 2px;
    transition: transform var(--transition), opacity var(--transition);
}

/* Mobile Navigation */
@media (max-width: 768px) {
    .nav__toggle {
        display: flex;
    }

    .nav__menu {
        position: absolute;
        top: var(--header-height);
        left: 0;
        right: 0;
        flex-direction: column;
        background-color: var(--white);
        padding: var(--spacing-md);
        gap: 0;
        border-bottom: 1px solid var(--gray-200);
        display: none;
    }

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

    .nav__menu li {
        width: 100%;
    }

    .nav__link {
        display: block;
        padding: var(--spacing-sm) 0;
        border-bottom: 1px solid var(--gray-100);
    }

    .nav__toggle.is-open .nav__toggle-bar:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }

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

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

/* =============================================
   Buttons
   ============================================= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: 500;
    border-radius: var(--border-radius);
    border: none;
    cursor: pointer;
    transition: all var(--transition);
}

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

.btn--primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* =============================================
   Hero Section
   ============================================= */
.hero {
    position: relative;
    padding-top: calc(var(--header-height) + var(--spacing-3xl));
    padding-bottom: var(--spacing-3xl);
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--white) 100%);
    text-align: center;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('../images/hero-pattern.svg');
    background-repeat: no-repeat;
    background-position: center center;
    background-size: cover;
    opacity: 0.6;
    pointer-events: none;
}

.hero .container {
    position: relative;
    z-index: 1;
}

.hero__title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--gray-900);
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

.hero__subtitle {
    font-size: var(--font-size-lg);
    color: var(--gray-600);
    max-width: 640px;
    margin: 0 auto var(--spacing-lg);
}

@media (min-width: 768px) {
    .hero {
        padding-top: calc(var(--header-height) + var(--spacing-3xl) + var(--spacing-xl));
        padding-bottom: calc(var(--spacing-3xl) + var(--spacing-xl));
    }

    .hero__title {
        font-size: var(--font-size-5xl);
    }

    .hero__subtitle {
        font-size: var(--font-size-xl);
    }
}

/* =============================================
   Section Styles
   ============================================= */
.section__title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--gray-900);
    text-align: center;
    margin-bottom: var(--spacing-sm);
}

.section__subtitle {
    font-size: var(--font-size-lg);
    color: var(--gray-600);
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--spacing-2xl);
}

/* =============================================
   Services Section
   ============================================= */
.services {
    padding: var(--spacing-3xl) 0;
    background-color: var(--white);
}

.services__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

@media (min-width: 768px) {
    .services__grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-lg);
    }
}

.service-card {
    background-color: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    transition: all var(--transition);
}

.service-card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.service-card__icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    background-color: var(--gray-50);
    border-radius: 50%;
    margin-bottom: var(--spacing-md);
    color: var(--primary);
}

.service-card__title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
}

.service-card__description {
    font-size: var(--font-size-base);
    color: var(--gray-600);
    margin-bottom: var(--spacing-md);
}

.service-card__list {
    padding-left: var(--spacing-md);
}

.service-card__list li {
    position: relative;
    font-size: var(--font-size-sm);
    color: var(--gray-600);
    padding: var(--spacing-xs) 0;
    padding-left: var(--spacing-sm);
}

.service-card__list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    background-color: var(--primary);
    border-radius: 50%;
}

/* =============================================
   About Section
   ============================================= */
.about {
    padding: var(--spacing-3xl) 0;
    background-color: var(--gray-50);
}

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

.about__text {
    font-size: var(--font-size-lg);
    color: var(--gray-600);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

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

/* =============================================
   Founder Section
   ============================================= */
.founder {
    padding: var(--spacing-3xl) 0;
    background-color: var(--white);
}

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

.founder__headshot {
    display: block;
    width: 160px;
    height: 160px;
    border-radius: 50%;
    object-fit: cover;
    margin: 0 auto var(--spacing-lg);
    border: 4px solid var(--white);
    box-shadow: var(--shadow-lg);
}

.founder__text {
    font-size: var(--font-size-lg);
    color: var(--gray-600);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.founder__text a {
    color: var(--primary);
    text-decoration: underline;
    text-decoration-color: var(--primary-light);
    text-underline-offset: 2px;
    transition: color var(--transition);
}

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

.founder__text--label {
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: var(--spacing-sm);
}

.founder__companies {
    font-size: var(--font-size-base);
    color: var(--gray-600);
    text-align: center;
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

.founder__companies a {
    color: var(--primary);
    text-decoration: underline;
    text-decoration-color: var(--primary-light);
    text-underline-offset: 2px;
    transition: color var(--transition);
}

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

/* =============================================
   Footer
   ============================================= */
.footer {
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    background-color: var(--gray-900);
    color: var(--gray-400);
}

.footer__content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--gray-700);
    margin-bottom: var(--spacing-lg);
}

@media (min-width: 768px) {
    .footer__content {
        flex-direction: row;
        justify-content: space-between;
        align-items: flex-start;
    }
}

.footer__brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.footer__logo {
    width: 48px;
    height: 48px;
    border-radius: 50%;
}

.footer__brand-name {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--white);
}

.footer__contact {
    text-align: center;
}

@media (min-width: 768px) {
    .footer__contact {
        text-align: right;
    }
}

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

.footer__email {
    display: block;
    font-size: var(--font-size-base);
    color: var(--primary-light);
    margin-bottom: var(--spacing-sm);
    transition: color var(--transition);
}

.footer__email:hover {
    color: var(--primary);
}

.footer__social {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
}

@media (min-width: 768px) {
    .footer__social {
        justify-content: flex-end;
    }
}

.footer__social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    color: var(--gray-400);
    background-color: var(--gray-700);
    border-radius: 50%;
    transition: all var(--transition);
}

.footer__social-link:hover {
    color: var(--white);
    background-color: var(--primary);
}

.footer__bottom {
    text-align: center;
    font-size: var(--font-size-sm);
}