/* ===== RESET & VARIABLES ===== */
:root {
    --pure-white: #ffffff;
    --off-white: #f5f5f5;
    --light-gray: #e5e5e5;
    --medium-gray: #cccccc;
    --dark-gray: #666666;
    --charcoal: #333333;
    --pure-black: #000000;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--pure-white);
    color: var(--charcoal);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== TYPOGRAPHY ===== */
h1,
h2,
h3,
h4 {
    font-weight: 600;
    line-height: 1.3;
}

h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

h2 .highlight {
    background: linear-gradient(135deg, var(--pure-black) 0%, var(--dark-gray) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-subtitle {
    display: inline-block;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 2px;
    color: var(--dark-gray);
    margin-bottom: 10px;
    text-transform: uppercase;
}

.section-header h2 {
    font-size: 2.2rem;
    color: var(--pure-black);
}

.section-header p {
    color: var(--dark-gray);
    max-width: 600px;
    margin: 0 auto;
}

/* ===== NAVBAR ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--light-gray);
    z-index: 1000;
    padding: 15px 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
}

.brand-icon {
    font-size: 1.8rem;
    color: var(--pure-black);
}

.nav-brand h1 {
    font-size: 1.5rem;
    color: var(--pure-black);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-menu a {
    text-decoration: none;
    color: var(--charcoal);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--pure-black);
    transition: var(--transition);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 100%;
}

.nav-auth {
    display: flex;
    gap: 15px;
}

.btn-outline {
    padding: 8px 20px;
    border: 1px solid var(--pure-black);
    background: transparent;
    color: var(--pure-black);
    text-decoration: none;
    border-radius: 30px;
    font-weight: 500;
    transition: var(--transition);
}

.btn-outline:hover {
    background: var(--pure-black);
    color: var(--pure-white);
}

.btn-primary {
    padding: 8px 20px;
    background: var(--pure-black);
    color: var(--pure-white);
    text-decoration: none;
    border-radius: 30px;
    font-weight: 500;
    border: 1px solid var(--pure-black);
    transition: var(--transition);
}

.btn-primary:hover {
    background: transparent;
    color: var(--pure-black);
}

.menu-toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

/* ===== HERO SECTION ===== */
.hero {
    padding: 140px 0 80px;
    background: linear-gradient(135deg, #ffffff 0%, #f5f5f5 100%);
}

.hero-content {
    display: flex;
    align-items: center;
    gap: 50px;
}

.hero-text {
    flex: 1;
}

.hero-text h2 {
    font-size: 3rem;
    line-height: 1.2;
    margin-bottom: 20px;
}

.hero-text p {
    font-size: 1.1rem;
    color: var(--dark-gray);
    margin-bottom: 30px;
    max-width: 500px;
}

.hero-buttons {
    display: flex;
    gap: 15px;
    margin-bottom: 40px;
}

.btn-large {
    padding: 12px 30px;
    font-size: 1rem;
}

.hero-stats {
    display: flex;
    gap: 40px;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--pure-black);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--dark-gray);
}

.hero-image {
    flex: 1;
    position: relative;
}

.mockup {
    background: var(--pure-white);
    border: 1px solid var(--light-gray);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.mockup:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.mockup-header {
    background: var(--off-white);
    padding: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
    border-bottom: 1px solid var(--light-gray);
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--medium-gray);
}

.dot:nth-child(1) {
    background: #ff5f56;
}

.dot:nth-child(2) {
    background: #ffbd2e;
}

.dot:nth-child(3) {
    background: #27c93f;
}

.mockup-title {
    margin-left: auto;
    font-size: 0.9rem;
    color: var(--dark-gray);
    font-weight: 500;
}

.mockup-body {
    padding: 20px;
}

.task-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 12px 0;
    border-bottom: 1px solid var(--light-gray);
}

.task-item:last-child {
    border-bottom: none;
}

.task-checkbox {
    width: 20px;
    height: 20px;
    border: 2px solid var(--pure-black);
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition);
}

.task-checkbox.checked {
    background: var(--pure-black);
    position: relative;
}

.task-checkbox.checked::after {
    content: '✓';
    color: var(--pure-white);
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 12px;
}

.task-text {
    flex: 1;
    font-size: 0.95rem;
}

.task-item.completed .task-text {
    text-decoration: line-through;
    color: var(--dark-gray);
}

.task-time {
    font-size: 0.85rem;
    color: var(--dark-gray);
}

.mockup-footer {
    padding: 15px;
    border-top: 1px solid var(--light-gray);
    background: var(--off-white);
}

.add-task {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--dark-gray);
    font-size: 0.9rem;
}

/* ===== FEATURES SECTION ===== */
.features {
    padding: 100px 0;
    background: var(--pure-white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-card {
    padding: 40px 30px;
    background: var(--pure-white);
    border: 1px solid var(--light-gray);
    border-radius: 15px;
    text-align: center;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-10px);
    border-color: var(--pure-black);
    box-shadow: var(--shadow);
}

.feature-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 25px;
    background: var(--off-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: var(--pure-black);
    transition: var(--transition);
}

.feature-card:hover .feature-icon {
    background: var(--pure-black);
    color: var(--pure-white);
}

.feature-card h3 {
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.feature-card p {
    color: var(--dark-gray);
    font-size: 0.95rem;
}

/* ===== HOW IT WORKS ===== */
.how-it-works {
    padding: 100px 0;
    background: var(--off-white);
}

.steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    position: relative;
}

.step {
    text-align: center;
    position: relative;
    z-index: 1;
}

.step-number {
    width: 60px;
    height: 60px;
    background: var(--pure-white);
    border: 2px solid var(--pure-black);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto 20px;
    color: var(--pure-black);
    transition: var(--transition);
}

.step:hover .step-number {
    background: var(--pure-black);
    color: var(--pure-white);
}

.step-icon {
    font-size: 2.5rem;
    color: var(--dark-gray);
    margin-bottom: 20px;
}

.step h3 {
    margin-bottom: 10px;
}

.step p {
    color: var(--dark-gray);
}

/* ===== LIVE DEMO ===== */
.live-demo {
    padding: 100px 0;
    background: linear-gradient(135deg, #ffffff 0%, #f5f5f5 100%);
}

.demo-container {
    max-width: 600px;
    margin: 0 auto;
}

.demo-info {
    text-align: center;
    margin-bottom: 40px;
}

.demo-info h2 {
    font-size: 2rem;
}

.demo-info p {
    color: var(--dark-gray);
}

.demo-app {
    background: var(--pure-white);
    border: 1px solid var(--light-gray);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.demo-header {
    padding: 20px;
    background: var(--off-white);
    border-bottom: 1px solid var(--light-gray);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.demo-header h3 {
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.demo-date {
    font-size: 0.9rem;
    color: var(--dark-gray);
}

.demo-tasks {
    padding: 20px;
    min-height: 200px;
}

.demo-task {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 12px 0;
    border-bottom: 1px solid var(--light-gray);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.demo-task .task-checkbox {
    flex-shrink: 0;
}

.demo-task .task-text {
    flex: 1;
    font-size: 0.95rem;
}

.demo-task .task-delete {
    color: var(--dark-gray);
    cursor: pointer;
    transition: var(--transition);
    opacity: 0;
}

.demo-task:hover .task-delete {
    opacity: 1;
}

.demo-task .task-delete:hover {
    color: var(--pure-black);
}

.demo-input {
    display: flex;
    padding: 20px;
    border-top: 1px solid var(--light-gray);
    gap: 10px;
}

.demo-input input {
    flex: 1;
    padding: 12px 15px;
    border: 1px solid var(--light-gray);
    border-radius: 30px;
    font-size: 0.95rem;
    transition: var(--transition);
}

.demo-input input:focus {
    outline: none;
    border-color: var(--pure-black);
}

.demo-input button {
    padding: 12px 25px;
    background: var(--pure-black);
    color: var(--pure-white);
    border: none;
    border-radius: 30px;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

.demo-input button:hover {
    background: var(--charcoal);
}

.demo-stats {
    padding: 15px 20px;
    border-top: 1px solid var(--light-gray);
    text-align: right;
    font-size: 0.9rem;
    color: var(--dark-gray);
}

/* ===== TESTIMONIALS ===== */
.testimonials {
    padding: 100px 0;
    background: var(--pure-white);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.testimonial-card {
    padding: 30px;
    background: var(--pure-white);
    border: 1px solid var(--light-gray);
    border-radius: 15px;
    transition: var(--transition);
}

.testimonial-card:hover {
    transform: translateY(-5px);
    border-color: var(--pure-black);
    box-shadow: var(--shadow);
}

.testimonial-content {
    margin-bottom: 20px;
    font-style: italic;
    color: var(--charcoal);
    position: relative;
}

.testimonial-content::before {
    content: '"';
    font-size: 4rem;
    position: absolute;
    top: -30px;
    left: -10px;
    color: var(--light-gray);
    opacity: 0.5;
    font-family: serif;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 15px;
}

.author-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    overflow: hidden;
    border: 2px solid var(--pure-black);
}

.author-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.author-info h4 {
    font-size: 1rem;
    margin-bottom: 5px;
}

.author-info p {
    font-size: 0.85rem;
    color: var(--dark-gray);
}

/* ===== PRICING ===== */
.pricing {
    padding: 100px 0;
    background: var(--off-white);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.pricing-card {
    background: var(--pure-white);
    border: 1px solid var(--light-gray);
    border-radius: 20px;
    padding: 40px 30px;
    transition: var(--transition);
    position: relative;
}

.pricing-card:hover {
    transform: translateY(-10px);
    border-color: var(--pure-black);
    box-shadow: var(--shadow);
}

.pricing-card.popular {
    border: 2px solid var(--pure-black);
    transform: scale(1.05);
}

.popular-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--pure-black);
    color: var(--pure-white);
    padding: 5px 15px;
    border-radius: 30px;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 1px;
}

.pricing-header {
    text-align: center;
    margin-bottom: 30px;
}

.pricing-header h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
}

.price {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--pure-black);
}

.price span {
    font-size: 0.9rem;
    font-weight: 400;
    color: var(--dark-gray);
}

.pricing-features {
    list-style: none;
    margin-bottom: 30px;
}

.pricing-features li {
    padding: 10px 0;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.95rem;
}

.pricing-features i {
    width: 20px;
    color: var(--pure-black);
}

.pricing-features .fa-times {
    color: var(--dark-gray);
}

.btn-block {
    display: block;
    text-align: center;
}

/* ===== FAQ ===== */
.faq {
    padding: 100px 0;
    background: var(--pure-white);
}

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

.faq-item {
    border-bottom: 1px solid var(--light-gray);
    padding: 20px 0;
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}

.faq-question h4 {
    font-size: 1.1rem;
    font-weight: 500;
}

.faq-toggle {
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: var(--transition);
}

.faq-item.active .faq-toggle {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    color: var(--dark-gray);
    padding-right: 30px;
}

.faq-item.active .faq-answer {
    max-height: 200px;
    margin-top: 15px;
}

/* ===== CTA ===== */
.cta {
    padding: 80px 0;
    background: var(--pure-black);
    color: var(--pure-white);
    text-align: center;
}

.cta-content {
    max-width: 600px;
    margin: 0 auto;
}

.cta h2 {
    font-size: 2.2rem;
    margin-bottom: 20px;
    color: var(--pure-white);
}

.cta p {
    margin-bottom: 30px;
    opacity: 0.9;
}

.cta .btn-primary {
    background: var(--pure-white);
    color: var(--pure-black);
    border-color: var(--pure-white);
}

.cta .btn-primary:hover {
    background: transparent;
    color: var(--pure-white);
}

/* ===== FOOTER ===== */
footer {
    background: var(--off-white);
    padding: 70px 0 20px;
    border-top: 1px solid var(--light-gray);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1.5fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
}

.footer-logo i {
    font-size: 1.8rem;
}

.footer-logo h3 {
    font-size: 1.3rem;
}

.footer-brand p {
    color: var(--dark-gray);
    margin-bottom: 20px;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-links a {
    color: var(--charcoal);
    font-size: 1.2rem;
    transition: var(--transition);
}

.social-links a:hover {
    color: var(--pure-black);
}

.footer-links h4 {
    margin-bottom: 20px;
    font-size: 1rem;
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: var(--dark-gray);
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--pure-black);
}

.footer-newsletter h4 {
    margin-bottom: 15px;
}

.footer-newsletter p {
    color: var(--dark-gray);
    margin-bottom: 15px;
}

.footer-newsletter form {
    display: flex;
    gap: 10px;
}

.footer-newsletter input {
    flex: 1;
    padding: 10px 15px;
    border: 1px solid var(--light-gray);
    border-radius: 30px;
    background: var(--pure-white);
}

.footer-newsletter input:focus {
    outline: none;
    border-color: var(--pure-black);
}

.footer-newsletter button {
    width: 40px;
    height: 40px;
    border: none;
    background: var(--pure-black);
    color: var(--pure-white);
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
}

.footer-newsletter button:hover {
    background: var(--charcoal);
}

.footer-bottom {
    text-align: center;
    padding-top: 40px;
    border-top: 1px solid var(--light-gray);
    color: var(--dark-gray);
    font-size: 0.9rem;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    h2 {
        font-size: 2rem;
    }

    .nav-menu,
    .nav-auth {
        display: none;
    }

    .menu-toggle {
        display: block;
    }

    .hero-content {
        flex-direction: column;
        text-align: center;
    }

    .hero-text h2 {
        font-size: 2.2rem;
    }

    .hero-text p {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-buttons {
        justify-content: center;
    }

    .hero-stats {
        justify-content: center;
    }

    .steps {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .pricing-card.popular {
        transform: scale(1);
    }

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

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

@media (max-width: 480px) {
    .hero-buttons {
        flex-direction: column;
    }

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

    .demo-input {
        flex-direction: column;
    }

    .demo-input button {
        width: 100%;
    }
}