/* Light theme (default) - Paper & Ink */
:root {
    --bg-color: #ffffff;
    --bg-secondary: #f2f2f7;
    --primary-color: #000000;
    --secondary-color: #8e8e93;
    --card-bg: rgba(0, 0, 0, 0.03);
    --card-bg-center: rgba(255, 255, 255, 0.8);
    --card-bg-edge: rgba(0, 0, 0, 0.08);
    --border-color: rgba(0, 0, 0, 0.1);
    --hover-bg: rgba(0, 0, 0, 0.05);
}

/* Dark theme colors - White ink on black paper */
.dark-theme {
    --bg-color: #000000;
    --bg-secondary: #1c1c1e;
    --primary-color: #ffffff;
    --secondary-color: #8e8e93;
    --card-bg: rgba(255, 255, 255, 0.05);
    --card-bg-center: rgba(255, 255, 255, 0.05);
    --card-bg-edge: rgba(255, 255, 255, 0.05);
    --border-color: rgba(255, 255, 255, 0.1);
    --hover-bg: rgba(255, 255, 255, 0.08);
}

/* System theme - follows OS preference */
@media (prefers-color-scheme: dark) {
    :root:not(.light-theme):not(.dark-theme) {
        --bg-color: #000000;
        --bg-secondary: #1c1c1e;
        --primary-color: #ffffff;
        --secondary-color: #8e8e93;
        --card-bg: rgba(255, 255, 255, 0.05);
        --card-bg-center: rgba(255, 255, 255, 0.05);
        --card-bg-edge: rgba(255, 255, 255, 0.05);
        --border-color: rgba(255, 255, 255, 0.1);
        --hover-bg: rgba(255, 255, 255, 0.08);
    }
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-color);
    color: var(--primary-color);
    line-height: 1.7;
    font-weight: 300;
    transition: background-color 0.4s ease, color 0.4s ease;
}

h1, h2, h3 {
    font-family: 'Crimson Pro', Georgia, serif;
    font-weight: 500;
    letter-spacing: -0.02em;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

@media (max-width: 767px) {
    .container {
        padding: 0 12px;
    }
}

/* Theme Switcher */
.theme-switcher {
    position: fixed;
    top: 20px;
    right: 20px;
    display: flex;
    gap: 8px;
    background-color: var(--card-bg);
    padding: 8px;
    border-radius: 999px;
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: opacity 0.3s ease, transform 0.3s ease;
    opacity: 1;
    transform: translateY(0);
}

.theme-switcher.hidden {
    opacity: 0;
    transform: translateY(-10px);
    pointer-events: none;
}

.theme-button {
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    cursor: pointer;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    color: var(--primary-color);
    opacity: 0.5;
}

.theme-button:hover {
    opacity: 0.8;
    background-color: var(--hover-bg);
}

.theme-button.active {
    opacity: 1;
    background-color: var(--primary-color);
    color: var(--bg-color);
}

.theme-button svg {
    width: 18px;
    height: 18px;
}

/* Hide theme switcher on mobile */
@media (max-width: 767px) {
    .theme-switcher {
        display: none;
    }
}

/* Hero Section */
.hero {
    padding: 100px 0 80px;
}

@media (max-width: 767px) {
    .hero {
        padding: 60px 0 30px;
    }
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
    align-items: end;
}

@media (max-width: 767px) {
    .hero-content {
        gap: 20px;
    }
}

@media (min-width: 768px) {
    .hero-content {
        grid-template-columns: 1fr 1fr;
    }
}

.hero-text {
    text-align: left;
}

@media (max-width: 767px) {
    .hero-text {
        text-align: center;
    }
}

.hero h1 {
    font-size: clamp(48px, 8vw, 96px);
    margin-bottom: 20px;
    line-height: 1;
}

/* App Icon */
.app-icon-wrapper {
    display: inline-block;
    margin-bottom: 20px;
}

.app-icon {
    width: 80px;
    height: 80px;
    border-radius: 22.5%;
    border: 1px solid var(--border-color);
    display: block;
}

@media (max-width: 767px) {
    .app-icon {
        width: 100px;
        height: 100px;
    }
}

.hero .subtitle {
    font-size: clamp(16px, 2.5vw, 20px);
    opacity: 0.85;
    margin-bottom: 25px;
    line-height: 1.6;
}

/* Platform Badges */
.platform-badges {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

@media (max-width: 767px) {
    .platform-badges {
        justify-content: center;
    }
}

.platform-badge {
    display: inline-block;
    background-color: transparent;
    color: var(--secondary-color);
    border: 1px solid var(--border-color);
    padding: 6px 16px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 400;
}

/* App Store Button */
.app-store-button {
    display: inline-block;
    width: 355px;
    height: auto;
    cursor: pointer;
    transition: opacity 0.2s ease;
}

.app-store-button:hover {
    opacity: 0.85;
}

.app-store-button svg {
    width: 100%;
    height: auto;
}

.app-store-mobile {
    display: none;
}

@media (max-width: 767px) {
    .app-store-desktop {
        display: none;
    }
    .app-store-mobile {
        display: inline-block;
        margin: 10px auto 0;
        max-width: 100%;
    }
}

/* Hero Visual - Hero Image */
.hero-visual {
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-image {
    max-width: 100%;
    height: auto;
    max-height: 600px;
    object-fit: contain;
}

@media (max-width: 767px) {
    .hero-image {
        max-width: 85%;
        max-height: 500px;
    }
}

/* Light/Dark hero image switching */
.hero-image-dark {
    display: none;
}

.hero-mobile {
    display: none;
}

.dark-theme .hero-image-light {
    display: none;
}

.dark-theme .hero-image-dark.hero-desktop {
    display: block;
}

/* System theme - follows OS preference */
@media (prefers-color-scheme: dark) {
    :root:not(.light-theme):not(.dark-theme) .hero-image-light {
        display: none;
    }
    :root:not(.light-theme):not(.dark-theme) .hero-image-dark.hero-desktop {
        display: block;
    }
}

/* Mobile: Use mobile hero images when layout stacks */
@media (max-width: 767px) {
    .hero-desktop {
        display: none !important;
    }

    .hero-mobile.hero-image-light {
        display: block;
    }

    .hero-mobile.hero-image-dark {
        display: none;
    }

    .dark-theme .hero-mobile.hero-image-light {
        display: none;
    }

    .dark-theme .hero-mobile.hero-image-dark {
        display: block;
    }
}

@media (max-width: 767px) and (prefers-color-scheme: dark) {
    :root:not(.light-theme):not(.dark-theme) .hero-mobile.hero-image-light {
        display: none;
    }
    :root:not(.light-theme):not(.dark-theme) .hero-mobile.hero-image-dark {
        display: block;
    }
}

/* Card Sections */
.section {
    padding: 60px 0;
}

@media (max-width: 767px) {
    .section {
        padding: 30px 0;
    }
}

#features {
    padding-top: 0;
}

#faq {
    padding-top: 0;
}

.section-title {
    font-size: clamp(36px, 5vw, 56px);
    text-align: center;
    margin-bottom: 60px;
}

@media (max-width: 767px) {
    .section-title {
        margin-bottom: 30px;
    }
}

.card {
    background: radial-gradient(ellipse at center, var(--card-bg-center) 0%, var(--card-bg-center) 50%, var(--card-bg-edge) 100%);
    border-radius: 30px;
    padding: 40px;
    margin-bottom: 40px;
    backdrop-filter: blur(10px);
    transition: background 0.4s ease-in-out;
    position: relative;
}

@media (max-width: 767px) {
    .card {
        padding: 20px 12px;
    }
}

.card-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
    align-items: end;
}

.card-content.reverse {
    direction: ltr;
}

@media (min-width: 768px) {
    .card-content {
        grid-template-columns: 1fr 1fr;
    }

    .card-content.reverse {
        direction: rtl;
    }

    .card-content.reverse > * {
        direction: ltr;
    }
}

.card-image {
    width: 100%;
    height: auto;
    object-fit: contain;
    border-radius: 20px;
}

.phone-mockup {
    width: 100%;
    border-radius: 20px;
    overflow: hidden;
}

.phone-mockup img {
    width: 100%;
    height: auto;
    display: block;
}

.card-text h3 {
    font-size: clamp(28px, 4vw, 36px);
    margin-bottom: 20px;
}

.card-text p {
    font-size: clamp(14px, 2vw, 16px);
    opacity: 0.9;
}

.card-text p strong {
    font-weight: 600;
    opacity: 1;
}

/* Card Row Layouts */
.card-row-50 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 40px;
}

.card-row-70-30 {
    display: grid;
    grid-template-columns: 7fr 3fr;
    gap: 20px;
    margin-bottom: 40px;
}

.card-row-50 .card,
.card-row-70-30 .card {
    min-height: 300px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin-bottom: 0;
}

.card-row-50 .card h3,
.card-row-70-30 .card h3 {
    font-size: clamp(28px, 4vw, 36px);
    text-align: center;
    margin: 0;
}

/* Card Title & Subtitle */
.card-title {
    font-size: clamp(28px, 4vw, 36px);
    margin: 0 0 10px 0;
    line-height: 1.1;
}

.card-subtitle {
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    color: var(--primary-color);
    margin: 0;
    line-height: 1.5;
}

.card-hint {
    font-family: 'Inter', sans-serif;
    font-size: 12px;
    color: var(--secondary-color);
    margin: 12px 0 0 0;
    line-height: 1.4;
}

.card-hint code {
    background-color: var(--hover-bg);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Inter', sans-serif;
    font-size: 11px;
}

/* Widgets Card */
.widgets-card {
    padding: 0;
    overflow: hidden;
    min-height: 400px;
}

.widgets-showcase {
    position: relative;
    width: 100%;
    height: 100%;
    min-height: 400px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.widget-img {
    position: absolute;
}

.widget-big {
    width: 55%;
    max-width: 220px;
}

.widget-small {
    width: 40%;
    max-width: 160px;
}

.widget-top-left {
    top: 5%;
    left: -5%;
    transform: rotate(-12deg);
}

.widget-top-right {
    top: 8%;
    right: -5%;
    transform: rotate(10deg);
}

.widget-bottom-left {
    bottom: 8%;
    left: 0%;
    transform: rotate(-8deg);
}

.widget-bottom-right {
    bottom: 5%;
    right: -8%;
    transform: rotate(15deg);
}

.widgets-text {
    text-align: center;
    z-index: 10;
    padding: 0 20px;
}

.widgets-text .card-subtitle {
    max-width: 160px;
}

@media (max-width: 767px) {
    .widgets-card {
        min-height: 350px;
    }

    .widgets-showcase {
        min-height: 350px;
    }

    .widget-big {
        width: 45%;
    }

    .widget-small {
        width: 35%;
    }
}

/* Action Button Card */
.action-button-card {
    padding: 0;
    overflow: hidden;
}

.action-button-content {
    display: flex;
    align-items: flex-end;
    height: 100%;
}

.action-button-text {
    flex: 1;
    padding: 30px;
}

.action-button-text .card-subtitle {
    margin: 0 0 10px 0;
}

.action-button-card h3.card-title {
    margin: 0;
    text-align: left;
}

.action-button-image {
    height: 85%;
    width: auto;
    object-fit: contain;
    padding: 2px 10px;
    align-self: center;
}

@media (max-width: 767px) {
    .action-button-text {
        padding: 20px;
    }

    .action-button-image {
        height: 90%;
    }
}

/* Ecosystem Image Card */
.ecosystem-image-card {
    padding: 30px 30px 0 30px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.ecosystem-image {
    width: 100%;
    flex: 1;
    object-fit: contain;
    display: block;
    border-radius: 12px;
}

/* Light/Dark ecosystem image switching */
.ecosystem-image-dark {
    display: none;
}

.dark-theme .ecosystem-image-light {
    display: none;
}

.dark-theme .ecosystem-image-dark {
    display: block;
}

@media (prefers-color-scheme: dark) {
    :root:not(.light-theme):not(.dark-theme) .ecosystem-image-light {
        display: none;
    }
    :root:not(.light-theme):not(.dark-theme) .ecosystem-image-dark {
        display: block;
    }
}

.ecosystem-image-text {
    padding: 25px 30px;
}

.ecosystem-image-text .card-title,
.ecosystem-image-text .card-subtitle {
    text-align: center;
}

/* Ecosystem Card */
.ecosystem-card {
    padding: 0;
    display: flex;
    flex-direction: column;
}

.ecosystem-card-top {
    flex: 1;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding: 30px 20px;
}

.ecosystem-card-bottom {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 30px 20px;
}

.ecosystem-card .card-title {
    margin-top: 0;
    margin-bottom: 12px;
}

.ecosystem-card .card-subtitle {
    text-align: center;
    max-width: 280px;
    margin: 0 auto;
}

.ecosystem-icons {
    display: flex;
    justify-content: center;
    align-items: flex-end;
    gap: 0;
    position: relative;
}

.ecosystem-icon-wrapper {
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.ecosystem-icon-wrapper.ecosystem-icon-main {
    width: 90px;
    height: 90px;
    z-index: 2;
    margin: 0 -8px;
}

.ecosystem-icon {
    width: 100%;
    height: 100%;
    object-fit: contain;
    filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.15));
}

.ecosystem-icon-siri .ecosystem-icon {
    border: 3px solid white;
    border-radius: 50%;
}

@media (max-width: 767px) {
    .card-row-50,
    .card-row-70-30 {
        grid-template-columns: 1fr;
    }

    .card-row-50 .card,
    .card-row-70-30 .card {
        min-height: 200px;
    }
}

/* Perfect For - Marquee */
.perfect-for-card {
    padding: 50px 0;
    overflow: hidden;
}

.perfect-for-title {
    font-family: 'Crimson Pro', Georgia, serif;
    font-size: clamp(36px, 5vw, 56px);
    color: var(--primary-color);
    margin: 0 0 30px 0;
    text-align: center;
}

.marquee-wrapper {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.marquee {
    display: flex;
    overflow: hidden;
    mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
    -webkit-mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
}

.marquee-content {
    display: flex;
    gap: 60px;
    padding-right: 60px;
    animation: marquee 50s linear infinite;
}

.marquee-reverse .marquee-content {
    animation: marquee-reverse 55s linear infinite;
}

.marquee-item {
    font-family: 'Inter', sans-serif;
    font-size: clamp(15px, 2vw, 18px);
    color: var(--secondary-color);
    font-weight: 400;
    white-space: nowrap;
}

@keyframes marquee {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(-100%);
    }
}

@keyframes marquee-reverse {
    0% {
        transform: translateX(-100%);
    }
    100% {
        transform: translateX(0);
    }
}


@media (max-width: 767px) {
    .perfect-for-card {
        padding: 30px 0;
    }

    .marquee-wrapper {
        gap: 15px;
    }

    .marquee-content {
        gap: 40px;
        padding-right: 40px;
    }
}

/* Date Divider */
.date-divider {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 24px;
}

.dashed-line {
    flex: 1;
    height: 1px;
    background-image: repeating-linear-gradient(
        to right,
        var(--border-color) 0,
        var(--border-color) 8px,
        transparent 8px,
        transparent 16px
    );
}

.current-date {
    font-family: 'Crimson Pro', Georgia, serif;
    font-size: 14px;
    color: var(--primary-color);
    opacity: 0.5;
    white-space: nowrap;
}

/* Philosophy Grid */
.philosophy-card {
    padding: 60px 40px;
}

@media (max-width: 767px) {
    .philosophy-card {
        padding: 30px 20px;
    }
}

.philosophy-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-top: 40px;
}

@media (max-width: 767px) {
    .philosophy-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

.philosophy-item {
    text-align: center;
}

.philosophy-item h4 {
    font-family: 'Crimson Pro', Georgia, serif;
    font-size: 20px;
    margin-bottom: 10px;
    font-weight: 600;
}

.philosophy-item p {
    font-size: 14px;
    opacity: 0.8;
}

/* Feature Cards Row */
.card-row-thirds {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 0;
}

.card-row-thirds .card {
    margin-bottom: 0;
}

.feature-card {
    padding: 30px;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    min-height: 220px;
    background: transparent;
}

.feature-icon {
    width: 44px;
    height: 44px;
    margin-bottom: 20px;
    color: var(--primary-color);
    opacity: 0.25;
}

.feature-icon svg {
    width: 100%;
    height: 100%;
}

.feature-title {
    font-family: 'Inter', sans-serif;
    font-size: 17px;
    font-weight: 700;
    color: var(--primary-color);
    margin: 0 0 12px 0;
    letter-spacing: -0.01em;
}

.feature-description {
    font-family: 'Inter', sans-serif;
    font-size: 15px;
    line-height: 1.5;
    color: var(--secondary-color);
    margin: 0;
}

@media (max-width: 767px) {
    .card-row-thirds {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .feature-card {
        padding: 24px 20px;
        min-height: auto;
    }

    .feature-icon {
        width: 36px;
        height: 36px;
        margin-bottom: 16px;
    }

    .feature-title {
        font-size: 16px;
    }

    .feature-description {
        font-size: 14px;
    }
}

/* FAQ Section - Apple-style Accordion */
.faq-accordion {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--border-color);
}

.faq-item:first-child {
    border-top: 1px solid var(--border-color);
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 0;
    cursor: pointer;
    list-style: none;
    font-family: 'Inter', sans-serif;
    font-size: 17px;
    font-weight: 600;
    color: var(--primary-color);
    transition: color 0.2s ease;
}

.faq-question::-webkit-details-marker {
    display: none;
}

.faq-question::marker {
    display: none;
    content: '';
}


.faq-icon {
    position: relative;
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    margin-left: 20px;
    transition: transform 0.3s ease;
}

.faq-icon::after {
    content: '';
    position: absolute;
    width: 10px;
    height: 10px;
    border-right: 2px solid var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -70%) rotate(45deg);
}

.faq-item[open] .faq-icon {
    transform: scaleY(-1);
}

.faq-answer {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 0.3s ease-out;
    overflow: hidden;
}

.faq-item[open] .faq-answer {
    grid-template-rows: 1fr;
}

.faq-answer-inner {
    overflow: hidden;
    padding-bottom: 0;
    transition: padding-bottom 0.3s ease-out;
}

.faq-item[open] .faq-answer-inner {
    padding-bottom: 24px;
}

.faq-answer p {
    font-family: 'Inter', sans-serif;
    font-size: 15px;
    line-height: 1.6;
    color: var(--primary-color);
    margin: 0;
    opacity: 0;
    transform: translateY(-8px);
    transition: opacity 0.25s ease-out 0.05s, transform 0.25s ease-out 0.05s;
}

.faq-item[open] .faq-answer p {
    opacity: 1;
    transform: translateY(0);
}

/* Closing animation */
.faq-item.closing .faq-answer {
    grid-template-rows: 0fr;
}

.faq-item.closing .faq-answer-inner {
    padding-bottom: 0;
}

.faq-item.closing .faq-answer p {
    opacity: 0;
    transform: translateY(-8px);
    transition: opacity 0.15s ease-out, transform 0.15s ease-out;
}

.faq-item.closing .faq-icon {
    transform: scaleY(1);
}

@media (max-width: 767px) {
    .faq-question {
        padding: 20px 0;
        font-size: 16px;
    }

    .faq-item[open] .faq-answer-inner {
        padding-bottom: 20px;
    }

    .faq-answer p {
        font-size: 14px;
    }
}

/* Footer */
footer {
    text-align: center;
    padding: 60px 20px 40px;
    opacity: 0.6;
    font-size: 14px;
}

@media (max-width: 767px) {
    footer {
        padding: 30px 0 30px;
    }
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}