/* ========================================
   ARITHMA DIGITAL - Professional Stylesheet
   ======================================== */

:root {
    --primary: #1d4ed8;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    --primary-bg: #eff6ff;
    --text-dark: #111827;
    --text: #374151;
    --text-light: #6b7280;
    --text-lighter: #9ca3af;
    --bg-white: #ffffff;
    --bg-light: #f9fafb;
    --bg-section: #f3f4f6;
    --border: #e5e7eb;
    --border-light: #f3f4f6;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --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);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
    --radius: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --transition: 0.2s ease;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text);
    background: var(--bg-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

img { max-width: 100%; height: auto; }
a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-dark); }

/* ========================================
   NAVIGATION
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    transition: all 0.3s ease;
}

.navbar.scrolled {
    border-bottom-color: var(--border);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-dark);
}

.logo-mark {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--primary);
    color: white;
    font-weight: 700;
    font-size: 18px;
    border-radius: 8px;
}

.logo-text {
    font-weight: 600;
    font-size: 18px;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    align-items: center;
    list-style: none;
    gap: 8px;
}

.nav-links a {
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text);
    border-radius: var(--radius);
    transition: all var(--transition);
}

.nav-links a:hover {
    color: var(--primary);
    background: var(--primary-bg);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-dark);
    border-radius: 2px;
    transition: all 0.3s ease;
}

/* ========================================
   BUTTONS
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    font-size: 15px;
    font-weight: 500;
    font-family: inherit;
    border-radius: var(--radius);
    border: none;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
}

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 1px 2px rgba(29,78,216,0.3);
}

.btn-primary:hover {
    background: var(--primary-dark);
    color: white;
    box-shadow: 0 4px 12px rgba(29,78,216,0.3);
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    color: var(--text);
    border: 1px solid var(--border);
}

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

.btn-nav {
    background: var(--primary);
    color: white !important;
    padding: 8px 20px;
    font-size: 14px;
}

.btn-nav:hover {
    background: var(--primary-dark) !important;
    color: white !important;
}

.btn-full {
    width: 100%;
}

/* ========================================
   HERO
   ======================================== */
.hero {
    padding: 160px 0 120px;
    background: linear-gradient(180deg, var(--bg-white) 0%, var(--bg-light) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(29,78,216,0.06) 0%, transparent 70%);
    border-radius: 50%;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(29,78,216,0.04) 0%, transparent 70%);
    border-radius: 50%;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 720px;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background: var(--primary-bg);
    color: var(--primary);
    font-size: 13px;
    font-weight: 600;
    border-radius: 100px;
    margin-bottom: 24px;
    letter-spacing: 0.02em;
}

.hero h1 {
    font-size: 52px;
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.03em;
    color: var(--text-dark);
    margin-bottom: 20px;
}

.hero-subtitle {
    font-size: 18px;
    line-height: 1.7;
    color: var(--text-light);
    margin-bottom: 36px;
    max-width: 560px;
}

.hero-cta {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

/* ========================================
   SECTION COMMON
   ======================================== */
.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 64px;
}

.section-tag {
    display: inline-block;
    padding: 4px 14px;
    background: var(--primary-bg);
    color: var(--primary);
    font-size: 13px;
    font-weight: 600;
    border-radius: 100px;
    margin-bottom: 16px;
    letter-spacing: 0.02em;
}

.section-header h2,
.about-content h2,
.contact-info h2 {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-dark);
    letter-spacing: -0.02em;
    line-height: 1.2;
    margin-bottom: 16px;
}

.section-header p {
    font-size: 17px;
    color: var(--text-light);
    line-height: 1.7;
}

/* ========================================
   SERVICES
   ======================================== */
.services {
    padding: 100px 0;
    background: var(--bg-white);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.service-card {
    padding: 36px;
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    transition: all 0.3s ease;
}

.service-card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.service-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    height: 52px;
    background: var(--primary-bg);
    color: var(--primary);
    border-radius: var(--radius-lg);
    margin-bottom: 20px;
}

.service-card h3 {
    font-size: 19px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 10px;
    letter-spacing: -0.01em;
}

.service-card p {
    font-size: 15px;
    color: var(--text-light);
    line-height: 1.7;
}

/* ========================================
   ABOUT
   ======================================== */
.about {
    padding: 100px 0;
    background: var(--bg-light);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.about-content p {
    font-size: 16px;
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 16px;
}

.about-stats {
    display: flex;
    gap: 32px;
    margin-top: 32px;
    padding-top: 32px;
    border-top: 1px solid var(--border);
}

.stat-value {
    display: block;
    font-size: 22px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 4px;
}

.stat-label {
    font-size: 13px;
    color: var(--text-light);
    font-weight: 500;
}

.about-visual {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.founder-card {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 20px;
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    transition: all 0.3s ease;
}

.founder-card:hover {
    box-shadow: var(--shadow-md);
}

.founder-photo {
    flex-shrink: 0;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    overflow: hidden;
    border: 2px solid var(--primary-bg);
}

.founder-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.founder-info h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 2px;
}

.founder-info span {
    font-size: 13px;
    color: var(--text-light);
    font-weight: 500;
}

.about-card {
    padding: 28px;
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    transition: all 0.3s ease;
}

.about-card:hover {
    box-shadow: var(--shadow-md);
}

.about-card-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    height: 52px;
    background: var(--primary-bg);
    color: var(--primary);
    border-radius: var(--radius-lg);
    margin-bottom: 16px;
}

.about-card h4 {
    font-size: 17px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.about-card p {
    font-size: 15px;
    color: var(--text-light);
    line-height: 1.6;
}

/* ========================================
   PROCESS
   ======================================== */
.process {
    padding: 100px 0;
    background: var(--bg-white);
}

.process-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

.step {
    text-align: center;
    padding: 32px 20px;
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: var(--primary);
    color: white;
    font-size: 16px;
    font-weight: 700;
    border-radius: 50%;
    margin-bottom: 20px;
}

.step h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.step p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.7;
}

/* ========================================
   CONTACT
   ======================================== */
.contact {
    padding: 100px 0;
    background: var(--bg-light);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: start;
}

.contact-heading {
    display: flex;
    align-items: center;
    gap: 16px;
}

.contact-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
}

.contact-info p {
    font-size: 16px;
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: 32px;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 15px;
    color: var(--text);
}

.contact-item svg {
    color: var(--primary);
    flex-shrink: 0;
}

.contact-item a {
    color: var(--text);
}

.contact-item a:hover {
    color: var(--primary);
}

.contact-form-wrapper {
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 40px;
    box-shadow: var(--shadow);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-dark);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 12px 16px;
    font-size: 15px;
    font-family: inherit;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-white);
    color: var(--text-dark);
    transition: all var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(59,130,246,0.12);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-lighter);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.form-group select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 40px;
}

/* ========================================
   FOOTER
   ======================================== */
.footer {
    padding: 64px 0 0;
    background: var(--text-dark);
    color: rgba(255,255,255,0.7);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-brand .logo {
    margin-bottom: 16px;
}

.footer-brand .logo-text {
    color: white;
}

.footer-brand p {
    font-size: 14px;
    line-height: 1.7;
    color: rgba(255,255,255,0.5);
}

.footer-links h4 {
    font-size: 14px;
    font-weight: 600;
    color: white;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-links ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links a,
.footer-links span {
    font-size: 14px;
    color: rgba(255,255,255,0.5);
    transition: color var(--transition);
}

.footer-links a:hover {
    color: white;
}

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 24px 0;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-legal p {
    font-size: 13px;
    color: rgba(255,255,255,0.4);
    line-height: 1.6;
}

.footer-legal-links {
    display: flex;
    gap: 24px;
}

.footer-legal-links a {
    font-size: 13px;
    color: rgba(255,255,255,0.4);
    transition: color var(--transition);
}

.footer-legal-links a:hover {
    color: white;
}

/* ========================================
   MODALS
   ======================================== */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 2000;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(4px);
    justify-content: center;
    align-items: center;
    padding: 24px;
}

.modal-overlay.active {
    display: flex;
}

.modal {
    background: var(--bg-white);
    border-radius: var(--radius-xl);
    padding: 48px;
    max-width: 640px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    box-shadow: var(--shadow-xl);
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 20px;
    background: none;
    border: none;
    font-size: 28px;
    color: var(--text-light);
    cursor: pointer;
    padding: 4px;
    line-height: 1;
    transition: color var(--transition);
}

.modal-close:hover {
    color: var(--text-dark);
}

.modal h2 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 16px;
}

.modal h3 {
    font-size: 17px;
    font-weight: 600;
    color: var(--text-dark);
    margin-top: 24px;
    margin-bottom: 8px;
}

.modal p {
    font-size: 15px;
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: 8px;
}

/* ========================================
   FORM SUCCESS STATE
   ======================================== */
.form-success {
    text-align: center;
    padding: 40px 20px;
}

.form-success svg {
    color: #10b981;
    margin-bottom: 16px;
}

.form-success h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.form-success p {
    font-size: 15px;
    color: var(--text-light);
}

/* ========================================
   RESPONSIVE
   ======================================== */
@media (max-width: 1024px) {
    .hero h1 { font-size: 42px; }
    .services-grid { grid-template-columns: repeat(2, 1fr); }
    .process-steps { grid-template-columns: repeat(2, 1fr); gap: 24px; }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 768px) {
    .nav-toggle { display: flex; }

    .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 16px 24px 24px;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-lg);
    }

    .nav-links.active { display: flex; }

    .nav-links li { width: 100%; }
    .nav-links a { display: block; padding: 12px 0; }

    .btn-nav { text-align: center; margin-top: 8px; }

    .hero { padding: 120px 0 80px; }
    .hero h1 { font-size: 32px; }
    .hero-subtitle { font-size: 16px; }

    .section-header h2,
    .about-content h2,
    .contact-info h2 { font-size: 28px; }

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

    .about-grid,
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .about-stats { flex-wrap: wrap; gap: 24px; }

    .process-steps { grid-template-columns: 1fr; gap: 16px; }
    .step { text-align: left; display: flex; gap: 20px; align-items: flex-start; padding: 20px; }
    .step-number { flex-shrink: 0; margin-bottom: 0; }

    .footer-grid { grid-template-columns: 1fr; gap: 32px; }
    .footer-bottom { flex-direction: column; align-items: flex-start; }

    .contact-form-wrapper { padding: 24px; }
    .modal { padding: 32px; }
}

@media (max-width: 480px) {
    .hero h1 { font-size: 28px; }
    .hero-cta { flex-direction: column; }
    .hero-cta .btn { width: 100%; }
    .service-card { padding: 24px; }
}