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

/* Modern Mobile UI Theme with Neumorphism */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: linear-gradient(135deg, #e0eafc 0%, #cfdef3 100%);
    background-attachment: fixed;
    color: #2c3e50;
    line-height: 1.85;
    padding: 30px 15px;
    position: relative;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    position: relative;
}

/* iPhone-Style Interface Mockup */
.phone-frame {
    background: #1c1c1e;
    padding: 25px 15px;
    border-radius: 45px;
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.4),
                inset 0 0 0 8px #2c2c2e,
                inset 0 0 0 10px #1c1c1e;
    position: relative;
    margin-bottom: 40px;
}

/* Phone Notch */
.phone-notch {
    position: absolute;
    top: 12px;
    left: 50%;
    transform: translateX(-50%);
    width: 150px;
    height: 28px;
    background: #1c1c1e;
    border-radius: 0 0 20px 20px;
    z-index: 10;
}

.phone-notch::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 6px;
    background: #3a3a3c;
    border-radius: 3px;
}

.phone-screen {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 35px;
    padding: 50px 30px 30px 30px;
    position: relative;
    overflow: hidden;
}

h1 {
    font-size: 2.2em;
    color: #fff;
    text-align: center;
    margin-bottom: 15px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.tagline {
    text-align: center;
    font-size: 1.1em;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 500;
}

/* Gesture Swipe Indicators */
.swipe-hint {
    position: absolute;
    bottom: 15px;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255, 255, 255, 0.7);
    font-size: 2em;
    animation: swipeAnim 2s ease-in-out infinite;
}

@keyframes swipeAnim {
    0%, 100% { transform: translateX(-50%) translateY(0); opacity: 1; }
    50% { transform: translateX(-50%) translateY(-15px); opacity: 0.5; }
}

/* Neumorphism Cards */
.neuro-section {
    background: #e0eafc;
    border-radius: 25px;
    padding: 40px;
    margin-bottom: 35px;
    box-shadow: 12px 12px 24px #bcc5d9,
                -12px -12px 24px #ffffff;
}

h2 {
    font-size: 2.3em;
    color: #667eea;
    margin-bottom: 25px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

h2::before {
    content: '📱 ';
    font-size: 0.9em;
}

h3 {
    font-size: 1.7em;
    color: #764ba2;
    margin: 30px 0 18px 0;
    font-weight: 600;
}

p {
    margin-bottom: 20px;
    font-size: 1.08em;
    color: #2c3e50;
    line-height: 1.9;
}

/* Touch Ripple Effect Cards */
.touch-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 25px;
    margin: 35px 0;
}

.touch-card {
    background: #e0eafc;
    padding: 35px 25px;
    border-radius: 20px;
    text-align: center;
    box-shadow: 8px 8px 16px #bcc5d9,
                -8px -8px 16px #ffffff;
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
    cursor: pointer;
}

.touch-card::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(102, 126, 234, 0.3) 0%, transparent 70%);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.touch-card:hover {
    transform: scale(1.05);
    box-shadow: 12px 12px 24px #bcc5d9,
                -12px -12px 24px #ffffff;
}

.touch-card:active::before {
    width: 300px;
    height: 300px;
}

.card-emoji {
    font-size: 3.5em;
    margin-bottom: 15px;
    display: block;
}

.card-label {
    font-size: 1.2em;
    color: #667eea;
    font-weight: 700;
    margin-bottom: 10px;
}

.card-detail {
    font-size: 0.95em;
    color: #555;
    line-height: 1.6;
}

/* Soft Shadow Box */
.soft-box {
    background: linear-gradient(145deg, #d5dfef, #ffffff);
    padding: 30px;
    margin: 30px 0;
    border-radius: 20px;
    box-shadow: 8px 8px 16px #bcc5d9,
                -8px -8px 16px #ffffff;
    border-left: 5px solid #667eea;
}

.soft-title {
    font-size: 1.3em;
    color: #667eea;
    font-weight: 700;
    margin-bottom: 12px;
}

.soft-text {
    color: #2c3e50;
    font-size: 1.05em;
    line-height: 1.8;
}

ul {
    margin: 25px 0 25px 35px;
    list-style: none;
}

li {
    margin-bottom: 16px;
    padding-left: 30px;
    position: relative;
    font-size: 1.05em;
    color: #2c3e50;
}

li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #667eea;
    font-weight: 900;
    font-size: 1.3em;
}

/* 3D Button with Transform */
.transform-button {
    background: linear-gradient(145deg, #7189f0, #5f73d8);
    color: #fff;
    padding: 20px 40px;
    border-radius: 15px;
    text-align: center;
    margin: 40px auto;
    max-width: 400px;
    box-shadow: 8px 8px 16px #bcc5d9,
                -8px -8px 16px #ffffff;
    transition: all 0.3s ease;
    cursor: pointer;
}

.transform-button:hover {
    transform: translateY(-5px);
    box-shadow: 12px 12px 24px #bcc5d9,
                -12px -12px 24px #ffffff;
}

.transform-button:active {
    transform: translateY(2px) scale(0.98);
    box-shadow: 4px 4px 8px #bcc5d9,
                -4px -4px 8px #ffffff;
}

.button-icon {
    font-size: 3em;
    margin-bottom: 15px;
}

.button-text {
    font-size: 1.5em;
    font-weight: 700;
}

/* Haptic Feedback Visual Cue */
.haptic-pulse {
    width: 100px;
    height: 100px;
    margin: 30px auto;
    background: #667eea;
    border-radius: 50%;
    position: relative;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(102, 126, 234, 0.7);
    }
    50% {
        transform: scale(1.1);
        box-shadow: 0 0 0 20px rgba(102, 126, 234, 0);
    }
}

a {
    color: #667eea;
    text-decoration: none;
    font-weight: 700;
    transition: all 0.3s;
}

a:hover {
    color: #764ba2;
}

footer {
    text-align: center;
    padding: 35px;
    color: #667eea;
    font-size: 0.95em;
    margin-top: 50px;
    border-top: 2px solid #bcc5d9;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 20px;
    box-shadow: 8px 8px 16px #bcc5d9,
                -8px -8px 16px #ffffff;
}

@media (max-width: 768px) {
    h1 { font-size: 1.9em; }
    h2 { font-size: 2em; }
    .neuro-section { padding: 30px 25px; }
    .phone-frame { padding: 20px 10px; }
}