/* ===================================
   Bluetooth DAS Landing Page Styles
   デザインシステム: クリーンUI / 物流DX
   =================================== */

/* ===== CSS Variables ===== */
:root {
    /* Colors */
    --base-bg: #F5F8FC;
    --panel-bg: #FFFFFF;
    --primary-blue: #1F4FD8;
    --secondary-blue: #4B7BFF;
    --light-blue: #EAF0FF;
    --border-gray: #D8DFEA;
    --text-primary: #1B2430;
    --text-secondary: #5B6B82;
    --success: #1FBF75;
    --alert: #E5533D;
    
    /* Typography */
    --font-primary: 'Roboto', sans-serif;
    --font-jp: 'Noto Sans JP', sans-serif;
    
    /* Layout */
    --max-width: 1200px;
    --section-spacing: 96px;
    --card-radius: 14px;
    
    /* Animation */
    --transition-duration: 500ms;
    --transition-easing: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

body {
    font-family: var(--font-jp), var(--font-primary);
    font-size: 16px;
    line-height: 1.75;
    color: var(--text-primary);
    background-color: var(--base-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== Typography ===== */
h1 {
    font-size: 64px;
    line-height: 1.2;
    font-weight: 700;
    margin-bottom: 24px;
}

h2 {
    font-size: 36px;
    line-height: 1.33;
    font-weight: 700;
    margin-bottom: 48px;
}

h3 {
    font-size: 22px;
    line-height: 1.45;
    font-weight: 700;
}

p {
    font-size: 16px;
    line-height: 1.75;
}

/* ===== Container ===== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Section Styles ===== */
.section {
    padding: var(--section-spacing) 0;
}

.section-headline {
    text-align: center;
    color: var(--text-primary);
}

.section-note,
.section-footer {
    text-align: center;
    margin-top: 32px;
    color: var(--text-secondary);
    font-size: 15px;
}

/* ===== Hero Section ===== */
.hero {
    background: linear-gradient(135deg, var(--light-blue) 0%, var(--base-bg) 100%);
    padding: 120px 0 96px;
    position: relative;
    overflow: hidden;
}

/* Hero Video Container */
.hero-video-container {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    border-radius: 14px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(31, 79, 216, 0.12);
    background: #000000;
}

.hero-video {
    width: 100%;
    height: 100%;
    object-fit: contain;
    object-position: center;
    display: block;
}

/* Hero Canvas Animation (Fallback) */
.hero-canvas-container {
    position: relative;
    width: 100%;
    height: 500px;
    border-radius: 14px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(31, 79, 216, 0.12);
}

#hero-canvas,
#hero-workflow-canvas {
    width: 100%;
    height: 100%;
    display: block;
    background: linear-gradient(135deg, #ffffff 0%, #f5f8fc 100%);
}

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

.hero-headline {
    color: var(--text-primary);
    margin-bottom: 20px;
}

.hero-subheadline {
    font-size: 22px;
    color: var(--text-secondary);
    margin-bottom: 48px;
}

.hero-support-points {
    display: flex;
    gap: 32px;
    margin-bottom: 48px;
}

.support-point {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 12px;
}

.support-point i {
    font-size: 36px;
    color: var(--primary-blue);
}

.support-point span {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.hero-cta {
    display: flex;
    gap: 16px;
}

/* Hero Visual (Device Mockup) */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.device-mockup {
    animation: float 3s ease-in-out infinite;
}

.device-body {
    width: 300px;
    height: 400px;
    background: var(--panel-bg);
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(31, 79, 216, 0.15);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 24px;
    padding: 40px;
    border: 2px solid var(--border-gray);
}

.led-indicator {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--primary-blue);
    box-shadow: 0 0 20px rgba(75, 123, 255, 0.6);
    animation: ledPulse 2s ease-in-out infinite;
}

.led-indicator:nth-child(2) {
    animation-delay: 0.3s;
}

.led-indicator:nth-child(3) {
    animation-delay: 0.6s;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-20px);
    }
}

@keyframes ledPulse {
    0%, 100% {
        opacity: 0.3;
    }
    50% {
        opacity: 1;
    }
}

/* ===== Hero with Background Video ===== */
.hero-with-bg-video {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0;
    overflow: hidden;
    background: transparent;
}

.hero-bg-video-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    overflow: hidden;
}

.hero-bg-video {
    position: absolute;
    top: 50%;
    left: 50%;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    transform: translate(-50%, -50%);
    object-fit: cover;
}

.hero-bg-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        135deg,
        rgba(31, 79, 216, 0.75) 0%,
        rgba(75, 123, 255, 0.6) 50%,
        rgba(234, 240, 255, 0.85) 100%
    );
    z-index: 1;
}

.hero-with-bg-video .container {
    position: relative;
    z-index: 2;
    display: block;
}

.hero-content-centered {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.hero-with-bg-video .hero-headline {
    color: #ffffff;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    font-size: 3rem;
    line-height: 1.3;
}

.hero-with-bg-video .hero-subheadline {
    color: #ffffff;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
    font-size: 1.25rem;
    margin-bottom: 48px;
}

.hero-with-bg-video .hero-support-points {
    justify-content: center;
    flex-wrap: wrap;
}

.hero-with-bg-video .support-point {
    background: rgba(255, 255, 255, 0.95);
    padding: 20px 16px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    min-width: 140px;
}

.hero-with-bg-video .support-point i {
    font-size: 36px;
    color: var(--primary-blue);
}

.hero-with-bg-video .support-point span {
    color: var(--text-primary);
    font-weight: 500;
}

.hero-with-bg-video .hero-cta {
    justify-content: center;
}

.hero-with-bg-video .btn {
    font-size: 18px;
    padding: 18px 40px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.hero-with-bg-video .btn-primary {
    background-color: #ffffff;
    color: var(--primary-blue);
    font-weight: 700;
}

.hero-with-bg-video .btn-primary:hover {
    background-color: #f0f4ff;
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.hero-with-bg-video .btn-secondary {
    background-color: transparent;
    color: #ffffff;
    border: 2px solid #ffffff;
}

.hero-with-bg-video .btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

/* ===== Buttons ===== */
.btn {
    padding: 16px 32px;
    font-size: 16px;
    font-weight: 500;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-duration) var(--transition-easing);
    font-family: var(--font-jp);
}

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

.btn-primary:hover {
    background-color: var(--secondary-blue);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(31, 79, 216, 0.3);
}

.btn-secondary {
    background-color: transparent;
    color: var(--primary-blue);
    border: 2px solid var(--primary-blue);
}

.btn-secondary:hover {
    background-color: var(--light-blue);
}

.btn-large {
    padding: 20px 48px;
    font-size: 18px;
}

/* ===== Card Styles ===== */
.card {
    background: var(--panel-bg);
    border-radius: var(--card-radius);
    padding: 32px;
    border: 1px solid var(--border-gray);
    transition: all var(--transition-duration) var(--transition-easing);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(31, 79, 216, 0.12);
}

.card-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--light-blue);
    border-radius: 12px;
    margin-bottom: 20px;
}

.card-icon i {
    font-size: 28px;
    color: var(--primary-blue);
}

.card-title {
    color: var(--text-primary);
    margin-bottom: 12px;
}

.card-desc {
    color: var(--text-secondary);
    font-size: 15px;
}

/* ===== Quad Cards (4 Cards Layout) ===== */
.quad-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

/* ===== Three Cards Layout ===== */
.three-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

/* ===== Use Case Cards ===== */
.usecase-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 28px;
}

.usecase-visual-card {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.card-visual-container {
    width: 100%;
    height: 200px;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    background: #E8ECF1;
}

.card-visual-container canvas {
    width: 100%;
    height: 100%;
    display: block;
}

.usecase-visual-card .card-title {
    text-align: center;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    line-height: 1.4;
}

.usecase-cards .card-caption {
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-align: center;
    margin-top: 8px;
    line-height: 1.5;
}

/* ===== Benefit Cards ===== */
.benefit-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

/* ===== System Diagram ===== */
.section-offline-model {
    background: var(--panel-bg);
}

.system-diagram {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
    margin-bottom: 64px;
}

.diagram-layer {
    display: flex;
    justify-content: center;
}

.diagram-item {
    background: var(--light-blue);
    border: 2px solid var(--primary-blue);
    border-radius: 16px;
    padding: 32px 48px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    text-align: center;
}

.diagram-item i {
    font-size: 48px;
    color: var(--primary-blue);
}

.diagram-item span {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-primary);
}

.diagram-arrow {
    font-size: 32px;
    color: var(--primary-blue);
}

/* Steps Flow */
.steps-flow {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 24px;
    flex-wrap: wrap;
}

.step-item {
    background: var(--panel-bg);
    border: 2px solid var(--border-gray);
    border-radius: var(--card-radius);
    padding: 24px;
    text-align: center;
    min-width: 200px;
}

.step-number {
    width: 48px;
    height: 48px;
    background: var(--primary-blue);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 700;
    margin: 0 auto 16px;
}

.step-item p {
    font-size: 15px;
    color: var(--text-secondary);
}

.step-arrow {
    font-size: 24px;
    color: var(--text-secondary);
}

/* ===== Workflow Section ===== */
.workflow {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 24px;
    flex-wrap: wrap;
}

.workflow-step {
    background: var(--panel-bg);
    border: 2px solid var(--border-gray);
    border-radius: var(--card-radius);
    padding: 32px;
    text-align: center;
    min-width: 200px;
    transition: all var(--transition-duration) var(--transition-easing);
}

.workflow-step:hover {
    border-color: var(--primary-blue);
    box-shadow: 0 8px 24px rgba(31, 79, 216, 0.12);
}

.workflow-icon {
    width: 80px;
    height: 80px;
    background: var(--light-blue);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.workflow-icon i {
    font-size: 32px;
    color: var(--primary-blue);
}

.workflow-title {
    color: var(--primary-blue);
    margin-bottom: 8px;
}

.workflow-desc {
    color: var(--text-secondary);
    font-size: 14px;
}

.workflow-arrow {
    font-size: 32px;
    color: var(--text-secondary);
}

/* ===== Closing CTA Section ===== */
.section-closing {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    text-align: center;
    padding: 120px 0;
}

.closing-headline {
    color: white;
    font-size: 48px;
    margin-bottom: 16px;
}

.closing-subheadline {
    color: rgba(255, 255, 255, 0.9);
    font-size: 20px;
    margin-bottom: 48px;
}

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

.section-closing .btn-primary:hover {
    background: var(--light-blue);
    transform: translateY(-4px);
}

/* ===== Footer ===== */
.footer {
    background: var(--text-primary);
    color: white;
    text-align: center;
    padding: 48px 0;
}

.footer p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
}

/* ===== Animation Classes ===== */
.fade-in {
    opacity: 0;
    animation: fadeIn var(--transition-duration) var(--transition-easing) forwards;
}

.fade-slide {
    opacity: 0;
    transform: translateY(30px);
}

.fade-slide.in-view {
    animation: fadeSlideIn var(--transition-duration) var(--transition-easing) forwards;
}

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}

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

/* ===== Responsive Design ===== */
@media (max-width: 1024px) {
    h1 {
        font-size: 42px;
    }
    
    h2 {
        font-size: 32px;
    }
    
    .hero .container {
        grid-template-columns: 1fr;
        gap: 48px;
    }
    
    .hero-visual {
        order: -1;
    }
    
    .hero-canvas-container {
        height: 400px;
    }
    
    .hero-video-container {
        aspect-ratio: 16 / 9;
    }
    
    .quad-cards {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .three-cards,
    .usecase-cards {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .benefit-cards {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --section-spacing: 64px;
    }
    
    h1 {
        font-size: 36px;
    }
    
    h2 {
        font-size: 28px;
    }
    
    h3 {
        font-size: 18px;
    }
    
    .hero {
        padding: 80px 0 64px;
    }
    
    .hero-with-bg-video {
        min-height: auto;
        padding: 80px 0;
    }
    
    .hero-with-bg-video .hero-headline {
        font-size: 2.25rem;
    }
    
    .hero-with-bg-video .hero-subheadline {
        font-size: 1.125rem;
        margin-bottom: 32px;
    }
    
    .hero-with-bg-video .support-point {
        min-width: 100px;
        padding: 16px 12px;
    }
    
    .hero-with-bg-video .support-point i {
        font-size: 32px;
    }
    
    .hero-with-bg-video .support-point span {
        font-size: 14px;
    }
    
    .hero-with-bg-video .btn {
        font-size: 16px;
        padding: 14px 32px;
    }
    
    .hero-canvas-container {
        height: 300px;
    }
    
    .hero-video-container {
        aspect-ratio: 16 / 9;
    }
    
    .hero-support-points {
        flex-direction: column;
        gap: 20px;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .quad-cards,
    .three-cards,
    .usecase-cards,
    .benefit-cards {
        grid-template-columns: 1fr;
    }
    
    .workflow,
    .steps-flow {
        flex-direction: column;
    }
    
    .workflow-arrow,
    .step-arrow {
        transform: rotate(90deg);
    }
    
    .device-body {
        width: 200px;
        height: 300px;
    }
    
    .led-indicator {
        width: 50px;
        height: 50px;
    }
    
    .closing-headline {
        font-size: 32px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    h1 {
        font-size: 28px;
    }
    
    h2 {
        font-size: 24px;
    }
    
    .card {
        padding: 24px;
    }
    
    .diagram-item {
        padding: 24px 32px;
    }
}