/* ==========================================================================
   Fitness Planet Design System - Dark & Orange Fitness Theme
   ========================================================================== */
:root {
    --font-heading: 'Outfit', 'Montserrat', -apple-system, sans-serif;
    --font-body: 'Plus Jakarta Sans', 'Montserrat', sans-serif;

    /* Theme Colors: Pure Black & Vibrant Electric Yellow (Logo Match) */
    --bg-dark: #0a0a0a;
    --bg-card: rgba(18, 18, 18, 0.85);
    --bg-card-hover: rgba(28, 28, 28, 0.95);

    --primary: #f1c40f;
    --primary-hover: #ffd700;
    --primary-glow: rgba(241, 196, 15, 0.35);

    --text-main: #ffffff;
    --text-muted: #b0b0b0;
    --text-dim: #707070;

    --border-card: rgba(255, 255, 255, 0.1);
    --border-card-hover: rgba(241, 196, 15, 0.4);

    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-full: 9999px;

    --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.7);
    --transition: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    width: 100%;
    min-height: 100vh;
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: var(--font-body);
    overflow-x: hidden;
    line-height: 1.5;
}

video {
    height: 100vh;
    width: 100vw;
    object-fit: cover;
    position: fixed;
    top: 0;
    left: 0;
    z-index: -1;
    filter: brightness(0.75) contrast(1.1);
}

#main {
    position: relative;
    z-index: 1;
}

/* Premium Dark Card Class */
.glass-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    transition: var(--transition);
}

/* Button Components */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 0.95rem;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    border-radius: var(--radius-full);
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    outline: none;
}

.btn-primary {
    background: var(--primary);
    color: #0a0a0a;
    box-shadow: 0 4px 20px var(--primary-glow);
}

.btn-primary:hover {
    background: var(--primary-hover);
    color: #000000;
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(241, 196, 15, 0.5);
}

.btn-outline {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-main);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: #ffffff;
    transform: translateY(-2px);
}

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    font-family: var(--font-heading);
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--primary);
    background: rgba(255, 107, 0, 0.1);
    border-radius: var(--radius-full);
    border: 1px solid rgba(255, 107, 0, 0.3);
    margin-bottom: 12px;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.page1 {
    min-height: 100vh;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 20px 60px;
    text-align: center;
}

.hero-content {
    max-width: 900px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.hero-badge {
    background: rgba(0, 0, 0, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.15);
    padding: 8px 24px;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--primary);
    backdrop-filter: blur(10px);
}

.hero-title {
    font-family: var(--font-heading);
    font-size: clamp(3rem, 7.5vw, 5.8rem);
    font-weight: 900;
    line-height: 1.05;
    letter-spacing: -1px;
    text-transform: uppercase;
    color: #ffffff;
}

.highlight-text {
    color: var(--primary);
}

.hero-subtitle {
    font-family: var(--font-heading);
    font-size: clamp(0.95rem, 2vw, 1.2rem);
    letter-spacing: 4px;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-top: 15px;
    flex-wrap: wrap;
    justify-content: center;
}

/* ==========================================================================
   AI Assistant Section
   ========================================================================== */
.chatbot-wrapper {
    width: 100%;
    display: flex;
    justify-content: center;
    padding: 0 20px 80px;
}

.chatbox {
    width: 100%;
    max-width: 750px;
    padding: 28px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Floating Modal Widget Mode for Header Icon Trigger */
.chatbox.chatbox-popup {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 380px;
    max-width: 90vw;
    z-index: 3000;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.8);
    border: 1px solid var(--border-card);
    transform: translateY(20px) scale(0.95);
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.chatbox.chatbox-popup.active {
    transform: translateY(0) scale(1);
    opacity: 1;
    pointer-events: all;
}

.chat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-card);
}

.bot-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.bot-avatar-badge {
    width: 40px;
    height: 40px;
    background: var(--primary);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
}

.bot-info h3 {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-main);
}

.status-online {
    font-size: 0.8rem;
    color: #22c55e;
    display: flex;
    align-items: center;
    gap: 6px;
}

.status-online::before {
    content: '';
    width: 6px;
    height: 6px;
    background-color: #22c55e;
    border-radius: 50%;
}

.chat-container {
    max-height: 320px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 14px;
    padding-right: 6px;
}

.chat-container .h1 {
    font-size: 1rem;
    color: var(--text-muted);
    font-weight: 500;
    text-align: center;
    margin-top: 10px;
}

.quick-prompts {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 10px;
}

.prompt-chip {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-card);
    color: var(--text-main);
    padding: 8px 18px;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.prompt-chip:hover {
    background: var(--primary);
    color: #ffffff;
    border-color: var(--primary);
}

.input-area {
    display: flex;
    gap: 12px;
    background: rgba(0, 0, 0, 0.5);
    padding: 8px 8px 8px 18px;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-card);
}

.input-area input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-main);
    font-family: var(--font-body);
    font-size: 0.95rem;
}

.input-area input::placeholder {
    color: var(--text-dim);
}

.input-area button {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: var(--primary);
    color: #ffffff;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.input-area button:hover {
    background: var(--primary-hover);
    transform: scale(1.05);
}

/* User & AI Bubble styles */
.user-chat-box, .ai-chat-box {
    padding: 12px 18px;
    border-radius: var(--radius-md);
    max-width: 80%;
    font-size: 0.95rem;
    line-height: 1.4;
    animation: fadeIn 0.3s ease;
}

.user-chat-box {
    align-self: flex-end;
    background: var(--primary);
    color: #ffffff;
    border-bottom-right-radius: 2px;
}

.ai-chat-box {
    align-self: flex-start;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--border-card);
    border-bottom-left-radius: 2px;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   BMI Diagnostic Section
   ========================================================================== */
#bmi-section {
    width: 100%;
    display: flex;
    justify-content: center;
    padding: 40px 20px 100px;
}

#calculator {
    width: 100%;
    max-width: 900px;
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 40px;
    padding: 44px;
    align-items: center;
}

#inputs {
    display: flex;
    flex-direction: column;
}

#inputs h2 {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 6px;
    text-align: left;
    color: var(--text-main);
}

.section-desc {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 24px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 18px;
}

.input-group label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-main);
}

.input-group input {
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid var(--border-card);
    color: var(--text-main);
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    outline: none;
    transition: var(--transition);
}

.input-group input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 12px var(--primary-glow);
}

/* Hide spin buttons / arrows for number inputs in BMI calculator */
.input-group input[type="number"]::-webkit-outer-spin-button,
.input-group input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.input-group input[type="number"] {
    -moz-appearance: textfield;
    appearance: textfield;
}

#calculate-btn {
    margin-top: 8px;
    width: 100%;
}

.result-card {
    margin-top: 24px;
    display: flex;
    justify-content: space-around;
    background: rgba(0, 0, 0, 0.6);
    border: 1px solid var(--border-card);
    padding: 18px;
    border-radius: var(--radius-md);
}

.res-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.res-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}

.res-val {
    font-family: var(--font-heading);
    font-size: 1.9rem;
    font-weight: 800;
    color: var(--primary);
}

.res-status {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 700;
    color: #ffffff;
}

/* SVG Gauge Container & Indicator */
#gauge {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

#gauge-container {
    position: relative;
    width: 270px;
    height: 155px;
    display: flex;
    justify-content: center;
}

.bmi-svg-gauge {
    width: 100%;
    height: 100%;
    overflow: visible;
}

#needle {
    width: 3px;
    height: 82px;
    background: linear-gradient(to top, var(--primary), #ffffff);
    position: absolute;
    bottom: 27px;
    left: 50%;
    transform-origin: bottom center;
    transform: translateX(-50%) rotate(-90deg);
    transition: transform 1s cubic-bezier(0.34, 1.56, 0.64, 1);
    border-radius: 3px;
    box-shadow: 0 0 14px var(--primary-glow);
    z-index: 2;
}

.gauge-center-pin {
    width: 18px;
    height: 18px;
    background: var(--primary);
    border: 3px solid #0a0a0a;
    border-radius: 50%;
    position: absolute;
    bottom: 18px;
    left: 50%;
    transform: translateX(-50%);
    box-shadow: 0 0 10px rgba(255, 107, 0, 0.6);
    z-index: 3;
}

.gauge-legend {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px 28px;
    margin-top: 10px;
    background: rgba(0, 0, 0, 0.4);
    padding: 12px 20px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-card);
}

.leg-item {
    font-size: 0.8rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
}

.leg-item .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
}

.leg-under .dot { background-color: #3b82f6; box-shadow: 0 0 6px rgba(59, 130, 246, 0.6); }
.leg-normal .dot { background-color: #22c55e; box-shadow: 0 0 6px rgba(34, 197, 94, 0.6); }
.leg-over .dot { background-color: var(--primary); box-shadow: 0 0 6px rgba(255, 107, 0, 0.6); }
.leg-obese .dot { background-color: #ef4444; box-shadow: 0 0 6px rgba(239, 68, 68, 0.6); }

/* ==========================================================================
   Features Stack Area
   ========================================================================== */
.stack-area {
    width: 100%;
    min-height: 300vh;
    position: relative;
    background: transparent;
    display: flex;
    padding: 40px 0;
}

.left {
    height: 100vh;
    flex-basis: 50%;
    position: sticky;
    top: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 0 60px;
}

.right {
    height: 100vh;
    flex-basis: 50%;
    position: sticky;
    top: 0;
}

.title {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    font-weight: 900;
    line-height: 1.1;
    color: var(--text-main);
    text-transform: uppercase;
}

.sub-title {
    font-size: 1.1rem;
    margin-top: 20px;
    color: var(--text-muted);
    max-width: 480px;
    line-height: 1.6;
}

.card {
    width: 360px;
    height: 340px;
    border-radius: var(--radius-lg);
    position: absolute;
    top: calc(50% - 170px);
    left: calc(50% - 180px);
    transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    padding: 36px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.card .sub {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.card .content {
    font-size: 1.05rem;
    color: var(--text-main);
    line-height: 1.5;
}

.card:hover {
    border-color: var(--border-card-hover);
    transform: translateY(-5px);
}

/* Dynamic background cards */
.card:nth-child(1) { background: rgba(18, 18, 18, 0.95); }
.card:nth-child(2) { background: rgba(24, 24, 24, 0.95); }
.card:nth-child(3) { background: rgba(30, 30, 30, 0.95); }
.card:nth-child(4) { background: rgba(36, 36, 36, 0.95); }

/* Responsive Breakpoints & Mobile Optimization */
@media (max-width: 900px) {
    #calculator {
        grid-template-columns: 1fr;
        padding: 28px;
        gap: 30px;
    }

    #inputs h2, .section-desc {
        text-align: center;
    }
}

@media (max-width: 768px) {
    .page1 {
        padding: 100px 16px 40px;
    }

    .hero-title {
        font-size: clamp(2.2rem, 9vw, 3.8rem);
    }

    .hero-subtitle {
        font-size: 0.85rem;
        letter-spacing: 2px;
    }

    .stack-area {
        flex-direction: column;
        min-height: auto;
        padding: 20px 0;
    }

    .left, .right {
        position: relative;
        height: auto;
        flex-basis: 100%;
        padding: 20px 16px;
    }

    .left {
        text-align: center;
    }

    .sub-title {
        margin-left: auto;
        margin-right: auto;
    }

    .card {
        position: relative;
        top: 0;
        left: 0;
        width: 100%;
        height: auto;
        min-height: 180px;
        margin-bottom: 20px;
        padding: 28px 24px;
    }

    #gauge-container {
        width: 100%;
        max-width: 260px;
    }
}

@media (max-width: 480px) {
    .hero-actions {
        flex-direction: column;
        width: 100%;
    }

    .hero-actions .btn {
        width: 100%;
    }

    #calculator {
        padding: 20px 16px;
    }

    .result-card {
        padding: 12px;
    }

    .res-val {
        font-size: 1.5rem;
    }

    .res-status {
        font-size: 1rem;
    }

    .gauge-legend {
        grid-template-columns: 1fr 1fr;
        padding: 10px 12px;
        gap: 8px 12px;
    }

    .leg-item {
        font-size: 0.75rem;
    }

    video {
        object-fit: cover;
    }
}

/* ==========================================================================
   Scroll-to-Top Floating Button
   ========================================================================== */
#scroll-top-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 46px;
    height: 46px;
    border-radius: 50%;
    background: rgba(18, 18, 18, 0.9);
    border: 1px solid rgba(241, 196, 15, 0.4);
    color: #f1c40f;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 2000;
    opacity: 0;
    transform: translateY(20px) scale(0.9);
    pointer-events: none;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.7);
}

#scroll-top-btn.visible {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
}

#scroll-top-btn:hover {
    background: #f1c40f;
    color: #0a0a0a;
    box-shadow: 0 0 20px rgba(241, 196, 15, 0.6);
    transform: translateY(-3px) scale(1.05);
}

@media (max-width: 480px) {
    #scroll-top-btn {
        bottom: 20px;
        right: 20px;
        width: 40px;
        height: 40px;
    }
}