:root {
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #444444;
    --color-header-bg: #353535;

    --color-text-header: #fafafa;
    --color-text-on-dark-header: #b8b8b8;
    --color-text-on-dark-text: #6a6a6a;
    --color-text-on-light-text: #353535;
    
    --color-accent: #38ade6;
    --color-error: #ff4757;
    --color-success: #2ed573;
    --color-scrollbar-thumb: #696969;
    --color-scrollbar-thumb-hover: #696969;
    --color-overlay-dark-95: rgba(10, 10, 10, 0.95);
    --color-overlay-dark-98: rgba(10, 10, 10, 0.98);
    --color-overlay-white-02: rgba(255, 255, 255, 0.02);
    --color-overlay-white-05: rgba(255, 255, 255, 0.05);
    --color-overlay-white-10: rgba(255, 255, 255, 0.1);
    --color-overlay-white-30: rgba(255, 255, 255, 0.3);
    --color-overlay-white-50: rgba(255, 255, 255, 0.5);
    --color-overlay-white-90: rgba(255, 255, 255, 0.9);
    --color-overlay-white-95: rgba(255, 255, 255, 0.95);
    --color-overlay-white-transparent: rgba(255, 255, 255, 0);
    --color-bg-dark-98: rgba(25, 25, 30, 0.98);
    --color-bg-dark-95: rgba(30, 30, 35, 0.95);
    --color-bg-dark-100: rgba(35, 35, 40, 1);
    --color-accent-15: rgba(56, 173, 230, 0.15);
    --color-accent-20: rgba(56, 173, 230, 0.2);
    --color-accent-25: rgba(56, 173, 230, 0.25);
    --color-accent-30: rgba(56, 173, 230, 0.3);
    --color-accent-50: rgba(56, 173, 230, 0.5);
    --color-overlay-black-10: rgba(0, 0, 0, 0.1);
    --color-overlay-black-15: rgba(0, 0, 0, 0.15);
    --color-overlay-black-20: rgba(0, 0, 0, 0.2);
    --color-overlay-black-30: rgba(0, 0, 0, 0.3);
    --color-overlay-black-70: rgba(0, 0, 0, 0.7);
}

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

.brand-color {
    color: var(--color-accent);
}

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

a.brand-color:hover {
    opacity: 0.8;
    text-decoration: underline;
}

body {
    font-family: 'Noto Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--color-bg-primary);
    background-image: url("data:image/svg+xml,%3Csvg width='20' height='20' xmlns='http://www.w3.org/2000/svg'%3E%3Cline x1='10' y1='7' x2='10' y2='13' stroke='%23808080' stroke-width='1' opacity='0.3'/%3E%3Cline x1='7' y1='10' x2='13' y2='10' stroke='%23808080' stroke-width='1' opacity='0.3'/%3E%3C/svg%3E");
    background-size: 20px 20px;
    color: var(--color-text-on-light-text);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    margin: 0 auto;
    padding: 0 20px;
}

.header {
    padding: 15px 0;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    max-width: 100%;
    background-color: var(--color-header-bg);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--color-overlay-white-10);
    box-sizing: border-box;
}

.nav {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    gap: 20px;
}

.logo-link {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    transition: opacity 0.3s ease;
    max-width: 100%;
    overflow: hidden;
}

.logo-link:hover {
    opacity: 0.8;
}

.logo-img {
    height: 32px;
    width: auto;
    border-radius: 4px;
}

.logo {
    font-family: 'Russo One', sans-serif;
    font-size: 24px;
    font-weight: 400;
    color: var(--color-text-header);
    text-decoration: none;
    margin: 0;
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

.logo-link:hover .logo {
    opacity: 1;
}

.nav-left {
    display: flex;
    align-items: center;
}

.nav-center {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 30px;
}

.nav-right {
    display: flex;
    align-items: center;
    justify-content: flex-end;
}

.nav-link {
    color: var(--color-text-header);
    text-decoration: none;
    font-weight: 400;
    transition: color 0.3s ease;
    opacity: 0.8;
}

.nav-link:hover {
    color: var(--color-text-header);
    opacity: 1;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--color-text-header);
    margin: 3px 0;
    transition: 0.3s;
    border-radius: 2px;
}

.btn {
    padding: 8px 12px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    display: inline-block;
    text-align: center;
    border: none;
    cursor: pointer;
    font-size: 14px;
}

.btn-primary {
    background-color: var(--color-accent);
    color: var(--color-text-on-light-text);
}

.btn-primary:hover {
    background-color: var(--color-accent);
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    color: var(--color-text-header);
    border: 1px solid var(--color-overlay-white-30);
}

.btn-outline:hover {
    background-color: var(--color-overlay-white-10);
    border-color: var(--color-overlay-white-50);
}

.github-star-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.github-stars {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-left: 6px;
}

.github-stars svg {
    width: 20px;
    height: 20px;
    fill: #38ade6;
    stroke: #38ade6;
    stroke-width: 1.5;
    stroke-linejoin: round;
    stroke-linecap: round;
    flex-shrink: 0;
}

.star-count {
    font-size: 16px;
    color: var(--color-text-header);
    white-space: nowrap;
    line-height: 1;
}


.hero {
    padding: 120px 0 80px;
    text-align: center;
    background: linear-gradient(to right, 
        var(--color-overlay-white-transparent) 0%, 
        var(--color-bg-primary) 10%, 
        var(--color-bg-primary) 90%, 
        var(--color-overlay-white-transparent) 100%);
}

.hero .content {
    max-width: none;
    padding: 0;
}

.hero-intro {
    max-width: 1000px;
    margin: 0 auto;
    text-align: left;
    overflow: visible;
}

.hero-intro h1 {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 24px;
    color: var(--color-text-on-light-text);
}

.hero-description {
    font-size: 18px;
    line-height: 1.6;
    margin-bottom: 32px;
    color: var(--color-text-on-light-text);
    text-align: left;
    padding-left: 105px;
    max-width: 60%;
}

.hero-preview {
    margin-top: 48px;
    text-align: center;
    position: relative;
    width: 80%;
    margin-left: auto;
    margin-right: auto;
}

.hero-preview-img {
    width: 100%;
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto;
    background: transparent;
}

.hero-preview-text {
    margin-top: 16px;
    text-align: right;
    color: #000000;
    font-size: 16px;
    padding-right: 15%;
}

.content {
    max-width: 750px;
    margin: 0 auto;
    padding: 40px 20px;
    border-radius: 8px;
}

.content h1 {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 30px;
    text-align: center;
    color: var(--color-text-on-light-text);
}

.content h2 {
    font-size: 32px;
    font-weight: 600;
    margin: 150px 0 20px;
    color: var(--color-text-on-light-text);
}

.content a[id="features"] + h2 {
    color: var(--color-overlay-white-95);
    background: linear-gradient(180deg, 
        var(--color-bg-dark-98) 0%, 
        var(--color-bg-dark-95) 50%, 
        var(--color-bg-dark-98) 100%);
    padding: 20px 40px;
    margin: 150px 0 40px 0;
    border-radius: 12px;
    display: inline-block;
    font-weight: 700;
}

.content p {
    margin-bottom: 20px;
    color: var(--color-text-on-dark-text);
    line-height: 1.7;
}


.why-impulse-fullwidth {
    margin-top: 100px;
    width: 100vw;
    margin-left: calc(-50vw + 50%);
    padding: 30px 0 22px 0;
    background: var(--color-header-bg);
    overflow-x: auto;
    scrollbar-width: thin;
    scrollbar-color: transparent transparent;
}

.why-impulse-fullwidth::-webkit-scrollbar {
    height: 8px;
}

.why-impulse-fullwidth::-webkit-scrollbar-track {
    background: transparent;
}

.why-impulse-fullwidth::-webkit-scrollbar-thumb {
    background: transparent;
    border-radius: 4px;
}

.why-impulse-fullwidth:hover,
.why-impulse-fullwidth:has(.why-impulse-section:hover),
.why-impulse-fullwidth:has(.why-impulse-list:hover),
.why-impulse-fullwidth:has(.why-impulse-item:hover) {
    scrollbar-color: var(--color-scrollbar-thumb) transparent;
}

.why-impulse-fullwidth:hover::-webkit-scrollbar-thumb,
.why-impulse-fullwidth:has(.why-impulse-section:hover)::-webkit-scrollbar-thumb,
.why-impulse-fullwidth:has(.why-impulse-list:hover)::-webkit-scrollbar-thumb,
.why-impulse-fullwidth:has(.why-impulse-item:hover)::-webkit-scrollbar-thumb {
    background: var(--color-accent) transparent;
}

.why-impulse-fullwidth:hover::-webkit-scrollbar-thumb:hover,
.why-impulse-fullwidth:has(.why-impulse-section:hover)::-webkit-scrollbar-thumb:hover,
.why-impulse-fullwidth:has(.why-impulse-list:hover)::-webkit-scrollbar-thumb:hover,
.why-impulse-fullwidth:has(.why-impulse-item:hover)::-webkit-scrollbar-thumb:hover {
    background: var(--color-accent) transparent;
}

.why-impulse-section {
    margin: 0 auto;
    padding: 0;
}

.why-impulse-list {
    display: flex;
    gap: 24px;
    padding: 0 40px;
    width: max-content;
}

.why-impulse-item {
    padding: 10px;
    width: 340px;
    min-width: 340px;
    border-radius: 16px;
    border: 1px solid var(--color-overlay-white-30);
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.why-impulse-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
}

.why-impulse-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent);
    flex-shrink: 0;
}

.why-impulse-icon svg {
    width: 32px;
    height: 32px;
    stroke: currentColor;
}

.why-impulse-content {
    text-align: left;
    margin-top: auto;
}

.why-impulse-item strong {
    color: var(--color-text-header);
    font-weight: 700;
    font-size: 18px;
    text-align: right;
}

.why-impulse-item p {
    color: var(--color-text-on-dark-header);
    font-size: 16px;
    line-height: 1.6;
    margin: 0;
    text-align: left;
}




.tiles-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-auto-rows: auto;
    gap: 20px;
    justify-content: center;
    margin: 60px auto 0;
    padding: 0 20px;
    align-items: stretch;
    max-width: 60%;
}

.tile-w1 { 
    grid-column: span 1; 
    width: 100%;
    aspect-ratio: 1 / 1;
    position: relative;
}
.tile-w2 { 
    aspect-ratio: 2 / 1;
    grid-column: span 2; 
}

.tile {
    background: #e6e6e6;
    position: relative;
    overflow: hidden;
    width: 100%;
    height: 100%;
    border: 1px solid var(--color-header-bg);
    box-sizing: border-box;
}


.tile-empty {
    background: transparent;
}

.tile-feature {
    padding: 24px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 100%;
    position: relative;
}

.tile-feature-with-image {
    flex-direction: row;
    align-items: stretch;
    padding: 0;
    height: 100%;
}

.tile-feature-with-image .tile-feature-text {
    padding: 24px;
    display: flex;
    flex-direction: column;
}

.tile-feature-image {
    flex: 0 0 auto;
    width: calc(50% - 10px);
    aspect-ratio: 1;
    overflow: hidden;
    padding: 0px;
    box-sizing: border-box;
    border-radius: 16px;
    align-self: center;
    margin-right: 5px;
}

.tile-feature-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.tile-feature-icon {
    margin-bottom: 20px;
}

.tile-feature-icons-overlapping {
    position: absolute;
    bottom: 20px;
    right: 20px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    --overlap: -12px;
}

.tile-icon-overlap {
    width: 12%;
    height: 12%;
    min-width: 32px;
    min-height: 32px;
    max-width: 64px;
    max-height: 64px;
    object-fit: contain;
    position: relative;
}

.tile-icon-overlap:not(:first-child) {
    margin-left: var(--overlap);
}

.tile-icon-overlap:nth-child(1) {
    z-index: 2;
}

.tile-icon-overlap:nth-child(2) {
    z-index: 1;
}

.tile-icon-overlap:nth-child(3) {
    z-index: 0;
}

.tile-feature-icon .tile-circle {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: #8c8c8c;
    margin-bottom: 0;
}

.tile-feature-title {
    font-size: 18px;
    font-weight: 600;
    color: #000000;
    text-align: left;
    margin: 0 0 8px 0;
}

.tile-feature-description {
    font-size: 16px;
    color: #000000;
    text-align: left;
    margin: 0;
    line-height: 1.5;
}

.tile-circle {
    width: 96px;
    height: 96px;
    border-radius: 50%;
    background: #8c8c8c;
    margin-bottom: 40px;
}


.section-title {
    font-size: 36px;
    font-weight: 600;
    text-align: center;
    margin-bottom: 60px;
    color: var(--color-text-on-light-text);
}



.footer {
    padding: 40px 0 40px;
    background-color: var(--color-header-bg);
    backdrop-filter: blur(10px);
    border-top: 1px solid var(--color-overlay-white-10);
    position: relative;
    width: 100vw;
    left: 50%;
    right: 50%;
    margin-left: -50vw;
    margin-right: -50vw;
}


.footer-content {
    display: flex;
    justify-content: flex-start;
    align-items: center;
    max-width: 100%;
    margin: 0 auto;
    padding: 0 40px;
    position: relative;
}

.footer-left {
    flex: 1;
    text-align: left;
}

.footer-left p {
    color: #808080;
    font-size: 14px;
    margin: 0;
}

.footer-center {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}

.footer-link {
    color: var(--color-accent);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s ease;
}

.footer-link:hover {
    color: var(--color-accent);
    opacity: 0.8;
}

.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: var(--color-overlay-black-70);
    backdrop-filter: blur(5px);
}

.modal-content {
    background-color: var(--color-bg-primary);
    margin: 5% auto;
    padding: 40px;
    border: 1px solid var(--color-overlay-white-10);
    border-radius: 0;
    width: 90%;
    max-width: 700px;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    box-shadow: 0 10px 40px var(--color-overlay-black-30);
}

.modal-close {
    color: var(--color-text-on-dark-text);
    float: right;
    font-size: 32px;
    font-weight: 300;
    line-height: 1;
    cursor: pointer;
    position: absolute;
    top: 15px;
    right: 20px;
    transition: color 0.3s ease;
}

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

.modal-content h2 {
    color: var(--color-text-on-light-text);
    font-size: 32px;
    font-weight: 600;
    margin-bottom: 20px;
    margin-top: 0;
}

.modal-body {
    color: var(--color-text-on-dark-text);
    line-height: 1.7;
}

.modal-body h3 {
    color: var(--color-text-on-light-text);
    font-size: 20px;
    font-weight: 600;
    margin-top: 25px;
    margin-bottom: 10px;
}

.modal-body p {
    margin-bottom: 15px;
}

.modal-body ul {
    margin: 15px 0;
    padding-left: 25px;
}

.modal-body li {
    margin-bottom: 8px;
}

.modal-body a {
    color: var(--color-accent);
    text-decoration: none;
}

.modal-body a:hover {
    text-decoration: underline;
}

@media (max-width: 1024px) {
    .container {
        padding: 0 15px;
    }
    
    .why-impulse-item {
        min-width: 0;
        padding: 20px;
    }
    
    .why-impulse-icon {
        width: 48px;
        height: 48px;
    }
    
    .why-impulse-icon svg {
        width: 24px;
        height: 24px;
    }
    
}

@media (max-width: 768px) {
    .header {
        padding: 12px 0;
        overflow: visible;
    }
    
    .nav {
        padding: 0 15px;
        grid-template-columns: 1fr auto;
        gap: 10px;
        max-width: 100%;
        box-sizing: border-box;
        position: relative;
    }
    
    .nav-left {
        min-width: 0;
        overflow: hidden;
    }
    
    .mobile-menu-toggle {
        flex-shrink: 0;
    }
    
    .nav-center,
    .nav-right {
        display: none;
        position: absolute;
        top: calc(100% + 22px);
        right: 10px;
        width: 55%;
        max-width: 55%;
        background-color: var(--color-header-bg);
        flex-direction: column;
        gap: 0;
        padding: 20px;
        border-top: 1px solid var(--color-overlay-white-10);
        box-sizing: border-box;
    }
    
    .nav-center.mobile-open {
        display: flex;
    }
    
    .nav-right.mobile-open {
        display: flex;
    }
    
    .nav-center .nav-link {
        padding: 10px 5px 10px 0;
        width: 100%;
        text-align: right;
        border-bottom: 1px solid var(--color-overlay-white-05);
    }
    
    .nav-center .nav-link:last-child {
        border-bottom: 1px solid var(--color-overlay-white-05);
    }
    
    .nav-right .btn {
        padding: 10px 20px 10px 0;
        width: 100%;
        text-align: right;
        margin-top: 0;
    }
    
    .github-star-btn {
        justify-content: center;
    }
    
    .github-stars {
        margin-left: 6px;
    }
    
    .github-stars svg {
        width: 18px;
        height: 18px;
    }
    
    .star-count {
        font-size: 16px;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .logo-img {
        height: 28px;
        flex-shrink: 0;
    }
    
    .logo {
        font-size: 20px;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero-intro {
        padding: 0 10px;
    }
    
    .hero-intro h1 {
        font-size: 36px;
    }
    
    .hero-description {
        font-size: 17px;
        padding-left: 0;
        text-align: left;
        max-width: 90%;
    }
    
    .hero-intro {
        text-align: center;
    }
    
    .hero-preview {
        margin-top: 32px;
        width: 95%;
    }
    
    .hero-preview-text {
        padding-right: 10%;
        font-size: 16px;
    }
    
    .section-title {
        font-size: 28px;
        margin-bottom: 40px;
        padding: 0 10px;
    }

    .tiles-grid {
        grid-template-columns: repeat(2, 1fr);
        grid-auto-rows: auto;
        gap: 20px;
        margin: 0;
        padding: 0 15px;
        align-items: start;
        max-width: 100%;
        width: 100%;
        box-sizing: border-box;
    }

    .tile-w1 {
        grid-column: span 1;
        width: 100%;
        aspect-ratio: 1 / 1;
        min-height: 0;
    }
    
    .tile-w2 {
        aspect-ratio: 2 / 1;
    }
    
    .tile-w1.tile {
        height: auto;
    }
    
    .tile-main {
        grid-row: auto;
    }
    
    .tile-feature {
        padding: 16px;
        height: auto;
    }
    
    .tile-w2 .tile-feature-image {
        width: calc(50% - 10px);
        aspect-ratio: 1;
        overflow: hidden;
        padding: 0px;
        box-sizing: border-box;
        border-radius: 16px;
        align-self: center;
        margin-right: 5px;
        flex: 0 0 auto;
    }

    .tile-feature-with-image {
        flex-direction: row;
        align-items: stretch;
        padding: 0;
    }
    
    .tile-feature-with-image .tile-feature-text {
        padding: 24px;
        display: flex;
        flex-direction: column;
    }
    
    .tile-feature-icon .tile-circle {
        width: 56px;
        height: 56px;
    }
    
    .tile-feature-title {
        font-size: 18px;
        line-height: 1.2;
    }
    
    .tile-feature-description {
        font-size: 13px;
    }
    
    .footer {
        width: 100vw;
        margin-left: calc(-50vw + 50%);
        margin-right: calc(-50vw + 50%);
        left: 0;
        right: 0;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 15px;
        text-align: center;
        padding: 0 15px;
    }
    
    .footer-left {
        text-align: center;
        order: 2;
    }
    
    .footer-center {
        position: relative;
        left: auto;
        transform: none;
        justify-content: center;
        order: 1;
    }
    
    .content {
        padding: 30px 15px;
    }
    
    .content h1 {
        font-size: 32px;
    }
    
    .content h2 {
        font-size: 28px;
    }
    
    
    .why-impulse-fullwidth {
        margin-top: 60px;
        padding: 20px 0;
    }
    
    .why-impulse-section {
        margin: 0;
        padding: 0;
    }
    
    .why-impulse-list {
        padding: 0 15px;
    }
    
    .why-impulse-item {
        min-width: 0;
        width: 282px;
        padding: 20px;
    }
    
    .why-impulse-icon {
        width: 44px;
        height: 44px;
    }
    
    .why-impulse-icon svg {
        width: 22px;
        height: 22px;
    }
    
    .why-impulse-item strong {
        font-size: 16px;
    }
    
    .why-impulse-item p {
        font-size: 14px;
    }
    
    .modal-content {
        width: 95%;
        margin: 10% auto;
        padding: 30px 20px;
        max-height: 85vh;
    }
    
    .modal-content h2 {
        font-size: 24px;
    }
    
    .modal-body h3 {
        font-size: 18px;
    }
}