/* ============================================
   RESET & VARIABLES
   ============================================ */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --soft-yellow: #FFF9E6;
    --soft-green: #E8F5E9;
    --soft-blue: #E3F2FD;
    --soft-peach: #FFF3E0;
    --primary: #F9A825;
    --primary-dark: #F57F17;
    --secondary: #43A047;
    --secondary-dark: #2E7D32;
    --accent: #1E88E5;
    --text: #2D2D2D;
    --text-light: #6B6B6B;
    --white: #FFFFFF;
    --card-bg: #FFFFFF;
    --border-radius: 18px;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    --shadow-hover: 0 12px 36px rgba(0, 0, 0, 0.12);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font);
    color: var(--text);
    background: linear-gradient(135deg, var(--soft-yellow) 0%, var(--soft-green) 50%, var(--soft-blue) 100%);
    min-height: 100vh;
    line-height: 1.6;
}

/* ============================================
   CONTAINER
   ============================================ */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ============================================
   TOP BAR
   ============================================ */
.top-bar {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    padding: 12px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.top-bar__inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    font-size: 0.9rem;
}

.top-bar__left {
    display: flex;
    gap: 16px;
    color: var(--text-light);
}

.top-bar__time {
    font-weight: 600;
    color: var(--text);
}

.top-bar__right {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
}

.top-bar__right i {
    color: var(--primary);
}

#banPrice {
    color: var(--secondary);
    font-weight: 700;
}

.top-bar__change {
    font-size: 0.8rem;
    font-weight: 600;
}

.top-bar__change.up { color: var(--secondary); }
.top-bar__change.down { color: #E53935; }

/* ============================================
   HERO - BIGGER TITLE & SLOGAN
   ============================================ */
.hero {
    text-align: center;
    padding: 80px 0 60px;
    position: relative;
}

.hero__logo {
    color: var(--primary);
    margin-bottom: 20px;
    animation: float 4s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.hero__title {
    font-size: clamp(3rem, 10vw, 6.5rem);
    font-weight: 900;
    letter-spacing: -0.035em;
    line-height: 1;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 40%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 24px;
    text-shadow: 0 0 60px rgba(249, 168, 37, 0.15);
}

.hero__slogan {
    font-size: clamp(1.25rem, 3.5vw, 1.9rem);
    color: var(--text-light);
    font-weight: 500;
    max-width: 780px;
    margin: 0 auto;
    line-height: 1.4;
}

.hero__slogan strong {
    color: var(--primary-dark);
    font-weight: 800;
}

/* ============================================
   MAIN GRID
   ============================================ */
.main {
    padding: 20px 0 80px;
}

.main__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 28px;
}

@media (max-width: 768px) {
    .main__grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   CARD
   ============================================ */
.card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 28px 24px;
    transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

.card__title {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text);
}

.card__title i {
    color: var(--primary);
}

/* ============================================
   CALCULATOR
   ============================================ */
.calculator__field {
    margin-bottom: 18px;
}

.calculator__field label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text-light);
}

.calculator__field input {
    width: 100%;
    padding: 12px 14px;
    border: 2px solid #E0E0E0;
    border-radius: 10px;
    font-size: 1rem;
    font-family: var(--font);
    transition: border-color 0.2s, background 0.2s;
    background: #FAFAFA;
}

.calculator__field input:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--white);
}

.calculator__hint {
    display: block;
    font-size: 0.75rem;
    color: var(--text-light);
    margin-top: 4px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: 10px;
    font-family: var(--font);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn--primary {
    background: var(--primary);
    color: var(--white);
    margin-right: 8px;
    margin-bottom: 8px;
}

.btn--primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.btn--ghost {
    background: transparent;
    color: var(--text-light);
    border: 2px solid #E0E0E0;
    margin-bottom: 8px;
}

.btn--ghost:hover {
    border-color: var(--primary);
    color: var(--primary);
}

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

.btn--secondary:hover {
    background: var(--secondary-dark);
    transform: translateY(-2px);
}

.btn--small {
    padding: 8px 16px;
    font-size: 0.85rem;
    margin-top: 12px;
    align-self: flex-start;
}

.calculator__result {
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid #EEE;
}

.calculator__result.hidden {
    display: none;
}

.calculator__result h3 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text);
}

.result__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

@media (max-width: 480px) {
    .result__grid {
        grid-template-columns: 1fr;
    }
}

.result__item {
    background: var(--soft-green);
    border-radius: 12px;
    padding: 14px;
    text-align: center;
}

.result__label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.result__value {
    display: block;
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--primary-dark);
    margin: 4px 0 2px;
}

.result__usd {
    display: block;
    font-size: 0.8rem;
    color: var(--text-light);
}

/* ============================================
   CHART
   ============================================ */
.chart-card {
    display: flex;
    flex-direction: column;
}

.chart-container {
    position: relative;
    width: 100%;
    height: 260px;
    flex: 1;
}

.chart-container canvas {
    max-width: 100%;
}

/* ============================================
   SECTIONS
   ============================================ */
.section {
    padding: 90px 0;
    position: relative;
}

.section--about {
    background: rgba(255, 255, 255, 0.65);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
}

.section--contact {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.4) 0%, rgba(255, 249, 230, 0.7) 100%);
}

/* Section header with badge icon */
.section__header {
    text-align: center;
    margin-bottom: 50px;
}

.section__icon-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 72px;
    height: 72px;
    border-radius: 22px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    font-size: 1.9rem;
    margin-bottom: 20px;
    box-shadow: 0 12px 28px rgba(249, 168, 37, 0.35);
    transform: rotate(-4deg);
    transition: transform 0.3s ease;
}

.section__icon-badge:hover {
    transform: rotate(0deg) scale(1.05);
}

.section__icon-badge--contact {
    background: linear-gradient(135deg, var(--secondary) 0%, var(--secondary-dark) 100%);
    box-shadow: 0 12px 28px rgba(67, 160, 71, 0.35);
}

.section__title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 900;
    letter-spacing: -0.025em;
    margin-bottom: 12px;
    color: var(--text);
}

.section__subtitle {
    font-size: clamp(1rem, 2vw, 1.15rem);
    color: var(--text-light);
    max-width: 620px;
    margin: 0 auto;
}

/* ============================================
   ABOUT GRID
   ============================================ */
.about__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

@media (max-width: 900px) {
    .about__grid {
        grid-template-columns: 1fr;
    }
}

.about__card {
    background: var(--white);
    border-radius: 20px;
    padding: 32px 28px;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid rgba(0, 0, 0, 0.03);
    display: flex;
    flex-direction: column;
}

.about__card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
}

.about__card-icon {
    width: 56px;
    height: 56px;
    border-radius: 16px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 18px;
    color: var(--white);
}

.about__card-icon--yellow {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    box-shadow: 0 8px 20px rgba(249, 168, 37, 0.3);
}

.about__card-icon--green {
    background: linear-gradient(135deg, var(--secondary) 0%, var(--secondary-dark) 100%);
    box-shadow: 0 8px 20px rgba(67, 160, 71, 0.3);
}

.about__card-icon--blue {
    background: linear-gradient(135deg, var(--accent) 0%, #1565C0 100%);
    box-shadow: 0 8px 20px rgba(30, 136, 229, 0.3);
}

.about__card h3 {
    font-size: 1.25rem;
    font-weight: 800;
    margin-bottom: 12px;
    color: var(--text);
    letter-spacing: -0.01em;
}

.about__card p {
    color: var(--text-light);
    font-size: 0.95rem;
    margin-bottom: 12px;
}

.about__card p strong {
    color: var(--text);
}

.about__links {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: auto;
    padding-top: 16px;
}

.link-icon {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 9px 16px;
    background: var(--soft-yellow);
    border-radius: 10px;
    text-decoration: none;
    color: var(--text);
    font-weight: 600;
    font-size: 0.85rem;
    transition: transform 0.2s, background 0.2s, color 0.2s;
}

.link-icon:hover {
    transform: translateY(-2px);
    background: var(--primary);
    color: var(--white);
}

.link-icon i {
    color: var(--primary);
    transition: color 0.2s;
}

.link-icon:hover i {
    color: var(--white);
}

.link-icon--highlight {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
}

.link-icon--highlight i {
    color: var(--white);
}

.link-icon--highlight:hover {
    transform: translateY(-2px) scale(1.03);
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
}

/* ============================================
   CONTACT GRID
   ============================================ */
.contact__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

@media (max-width: 900px) {
    .contact__grid {
        grid-template-columns: 1fr;
    }
}

.contact__card {
    background: var(--white);
    border-radius: 20px;
    padding: 32px 28px;
    text-decoration: none;
    color: var(--text);
    box-shadow: var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid rgba(0, 0, 0, 0.03);
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.contact__card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

.contact__card:hover::before {
    transform: scaleX(1);
}

.contact__card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
}

.contact__card--featured {
    background: linear-gradient(160deg, #FFFDF5 0%, #FFF3E0 100%);
    border: 2px solid rgba(249, 168, 37, 0.3);
}

.contact__card-icon {
    width: 56px;
    height: 56px;
    border-radius: 16px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 18px;
    color: var(--white);
    background: linear-gradient(135deg, #FF5722 0%, #D84315 100%);
    box-shadow: 0 8px 20px rgba(255, 87, 34, 0.3);
}

.contact__card-icon--green {
    background: linear-gradient(135deg, var(--secondary) 0%, var(--secondary-dark) 100%);
    box-shadow: 0 8px 20px rgba(67, 160, 71, 0.3);
}

.contact__card-icon--yellow {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    box-shadow: 0 8px 20px rgba(249, 168, 37, 0.3);
}

.contact__card h3 {
    font-size: 1.25rem;
    font-weight: 800;
    margin-bottom: 10px;
    color: var(--text);
    letter-spacing: -0.01em;
}

.contact__card p {
    color: var(--text-light);
    font-size: 0.95rem;
    margin-bottom: 20px;
    flex: 1;
}

.contact__card-cta {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--primary-dark);
    margin-top: auto;
}

.contact__card-cta i {
    transition: transform 0.3s ease;
}

.contact__card:hover .contact__card-cta i {
    transform: translateX(4px);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-top: 1px solid rgba(0, 0, 0, 0.05);
    padding: 40px 0 30px;
    text-align: center;
    color: var(--text-light);
}

.footer__credit {
    margin-bottom: 20px;
}

.footer__credit-label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--text-light);
    margin-bottom: 18px;
}

.footer__icons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 28px;
}

.footer__icon {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    transition: transform 0.25s ease;
}

.footer__icon:hover {
    transform: translateY(-4px);
}

.footer__icon i {
    font-size: 2.8rem;
    line-height: 1;
    transition: transform 0.25s ease;
}

.footer__icon:hover i {
    transform: scale(1.1);
}

.footer__icon-name {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-light);
    letter-spacing: 0.02em;
}

/* Individual brand colors */
.footer__icon--html i { color: #E44D26; }
.footer__icon--css i { color: #264DE4; }
.footer__icon--js i { color: #F7DF1E; }
.footer__icon--chart i { color: var(--primary-dark); }
.footer__icon--fa i { color: #528DD7; }

.footer__small {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-top: 8px;
}

.footer__small strong {
    color: var(--text);
    font-weight: 700;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 600px) {
    .top-bar__inner {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }

    .hero {
        padding: 50px 0 40px;
    }

    .hero__logo svg {
        width: 80px;
        height: 80px;
    }

    .card {
        padding: 20px 16px;
    }

    .section {
        padding: 60px 0;
    }

    .about__card,
    .contact__card {
        padding: 24px 20px;
    }

    .btn {
        width: 100%;
    }

    .footer__icons {
        gap: 20px;
    }

    .footer__icon i {
        font-size: 2.2rem;
    }

    .footer__icon-name {
        font-size: 0.75rem;
    }
}