/* PPADDL.com - Aquatic Calm */
/* Palette: #ECFEFF, #A5F3FC, #67E8F9, #06B6D4, #0891B2, #164E63, #FFFFFF */
/* Fonts: Lato (display/headlines, 300 weight), Inter (body/labels, 400 weight) */

:root {
    --lightest-cyan: #ECFEFF;
    --light-cyan: #A5F3FC;
    --sky-cyan: #67E8F9;
    --deep-teal: #06B6D4;
    --teal: #0891B2;
    --dark-teal: #164E63;
    --white: #FFFFFF;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background: linear-gradient(
        180deg,
        var(--lightest-cyan) 0%,
        var(--light-cyan) 15%,
        var(--sky-cyan) 35%,
        var(--deep-teal) 60%,
        var(--teal) 80%,
        var(--dark-teal) 100%
    );
    color: var(--dark-teal);
    font-family: 'Inter', sans-serif;
    font-weight: 400;
    line-height: 1.8;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ============================================
   SECTION BASE
   ============================================ */

.water-section {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
}

/* ============================================
   HERO / SURFACE (0 - 100vh)
   ============================================ */

.hero-section {
    min-height: 100vh;
    justify-content: center;
    background: linear-gradient(180deg, var(--lightest-cyan) 0%, var(--light-cyan) 60%, var(--sky-cyan) 100%);
    padding: 4rem 2rem 0;
    overflow: hidden;
}

/* Concentric ripple circles */
.ripple-circles {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
    z-index: 1;
}

.ripple {
    position: absolute;
    border: 1.5px solid rgba(22, 78, 99, 0.12);
    border-radius: 50%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80px;
    height: 80px;
    animation: rippleExpand 5s ease-out infinite;
}

.r1 { animation-delay: 0s; }
.r2 { animation-delay: 1.6s; }
.r3 { animation-delay: 3.2s; }

@keyframes rippleExpand {
    0% {
        width: 80px;
        height: 80px;
        opacity: 0.6;
        border-width: 1.5px;
    }
    100% {
        width: 500px;
        height: 500px;
        opacity: 0;
        border-width: 0.5px;
    }
}

/* Hero content */
.hero-content {
    position: relative;
    text-align: center;
    z-index: 2;
}

.brand-name {
    font-family: 'Lato', sans-serif;
    font-weight: 300;
    font-size: clamp(3.5rem, 12vw, 7rem);
    color: var(--dark-teal);
    letter-spacing: 0.1em;
    line-height: 1.1;
}

.brand-tagline {
    font-family: 'Lato', sans-serif;
    font-weight: 300;
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    color: var(--teal);
    margin-top: 1.5rem;
    opacity: 0.65;
    letter-spacing: 0.06em;
}

/* Hero wave divider */
.hero-wave {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    line-height: 0;
    z-index: 3;
}

.hero-wave .wave-svg {
    width: 100%;
    height: 80px;
    display: block;
}

/* ============================================
   WAVE DIVIDERS (shared)
   ============================================ */

.wave-divider {
    width: 100%;
    line-height: 0;
}

.wave-svg {
    width: 100%;
    display: block;
}

.wave-path {
    transform-origin: center;
}

.wave-1 {
    animation: waveShift1 7s ease-in-out infinite alternate;
}

.wave-2 {
    animation: waveShift2 9s ease-in-out infinite alternate;
}

.wave-3 {
    animation: waveShift1 8s ease-in-out infinite alternate;
}

.wave-4 {
    animation: waveShift2 6s ease-in-out infinite alternate;
}

.wave-5 {
    animation: waveShift1 10s ease-in-out infinite alternate;
}

@keyframes waveShift1 {
    0% { transform: translateX(0); }
    100% { transform: translateX(-30px); }
}

@keyframes waveShift2 {
    0% { transform: translateX(0); }
    100% { transform: translateX(25px); }
}

.section-wave .wave-svg {
    height: 70px;
}

/* ============================================
   STROKES / CONTENT (100 - 260vh)
   ============================================ */

.strokes-section {
    padding: 4rem 2rem 2rem;
    background: transparent;
}

.strokes-inner {
    max-width: 780px;
    width: 100%;
}

/* Water-drop bullet markers */
.drop-marker {
    width: 10px;
    height: 14px;
    background: var(--deep-teal);
    border-radius: 50% 50% 50% 0;
    transform: rotate(-45deg);
    margin-bottom: 1.5rem;
    opacity: 0.8;
}

/* Stroke cards: semi-transparent white */
.stroke-card {
    background: rgba(255, 255, 255, 0.50);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 16px;
    padding: 3rem 3.5rem;
    margin: 2rem 0;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.9s ease, transform 0.9s ease;
}

.stroke-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.stroke-title {
    font-family: 'Lato', sans-serif;
    font-weight: 300;
    font-size: clamp(1.75rem, 4vw, 2.8rem);
    color: var(--dark-teal);
    margin-bottom: 1rem;
    line-height: 1.2;
}

.stroke-body {
    font-family: 'Inter', sans-serif;
    font-weight: 400;
    font-size: clamp(0.95rem, 1.5vw, 1.05rem);
    line-height: 1.8;
    color: var(--dark-teal);
    opacity: 0.72;
}

/* ============================================
   CURRENT / ICON STRIP (260 - 340vh)
   ============================================ */

.current-section {
    padding: 6rem 2rem 8rem;
    background: transparent;
}

.current-title {
    font-family: 'Lato', sans-serif;
    font-weight: 300;
    font-size: clamp(1.5rem, 3vw, 2rem);
    color: var(--white);
    margin-bottom: 3rem;
    text-align: center;
    opacity: 0.85;
    letter-spacing: 0.04em;
}

.current-strip {
    display: flex;
    gap: 2.5rem;
    overflow-x: auto;
    overflow-y: hidden;
    padding: 1rem 2rem;
    max-width: 100%;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}

.current-strip::-webkit-scrollbar {
    display: none;
}

.current-icon {
    flex: 0 0 auto;
    text-align: center;
    scroll-snap-align: center;
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.current-icon.visible {
    opacity: 1;
    transform: translateY(0);
}

.icon-circle {
    width: 48px;
    height: 48px;
    border: 1px solid rgba(255, 255, 255, 0.35);
    border-radius: 50%;
    margin: 0 auto 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: border-color 0.4s ease, background-color 0.4s ease, transform 0.4s ease;
}

.current-icon:hover .icon-circle {
    border-color: var(--white);
    background-color: rgba(255, 255, 255, 0.12);
    transform: scale(1.08);
}

.icon-svg {
    width: 28px;
    height: 28px;
}

.icon-label {
    font-family: 'Inter', sans-serif;
    font-size: 11px;
    font-weight: 400;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.55);
    display: block;
}

/* ============================================
   DEPTHS / FOOTER (340vh+)
   ============================================ */

.depths-section {
    min-height: 40vh;
    padding: 8rem 2rem 6rem;
    justify-content: center;
    background: transparent;
}

.depths-content {
    text-align: center;
}

.depths-text {
    font-family: 'Lato', sans-serif;
    font-weight: 300;
    font-size: clamp(1.2rem, 2.5vw, 1.6rem);
    color: var(--white);
    opacity: 0.5;
    margin-bottom: 2.5rem;
    letter-spacing: 0.05em;
}

.sine-wave {
    width: 220px;
    margin: 0 auto 2.5rem;
}

.sine-svg {
    width: 100%;
    height: 40px;
    display: block;
}

.sine-path {
    opacity: 0.35;
    animation: sineFloat 4s ease-in-out infinite alternate;
}

@keyframes sineFloat {
    0% { transform: translateX(0); }
    100% { transform: translateX(-8px); }
}

.depths-brand {
    font-family: 'Inter', sans-serif;
    font-size: 11px;
    font-weight: 400;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.25);
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 768px) {
    .stroke-card {
        padding: 2rem 1.5rem;
    }

    .current-strip {
        gap: 2rem;
        padding: 1rem 1rem;
    }

    .hero-section {
        padding: 2rem 1.5rem 0;
    }

    .hero-wave .wave-svg {
        height: 50px;
    }

    .section-wave .wave-svg {
        height: 50px;
    }
}

@media (max-width: 480px) {
    .brand-name {
        letter-spacing: 0.06em;
    }

    .stroke-card {
        padding: 1.5rem 1.25rem;
        margin: 1.5rem 0;
    }

    .strokes-section {
        padding: 2rem 1rem 1rem;
    }

    .current-section {
        padding: 4rem 1rem 6rem;
    }

    .depths-section {
        padding: 5rem 1rem 4rem;
    }
}