/* Reset & layout basics */
html, body {
    overflow-x: hidden;
    margin: 0;
    padding: 0;
    width: 100vw;
    min-height: 100%;
    font-family: 'Noto Sans JP', sans-serif;
}

    body.home-lock-scroll {
        overflow: hidden;
    }

/* Gradient text (for "Sekai") */
.gradient-text {
    background: linear-gradient(270deg, #DD2931, #F5365C, #FFFFFF);
    background-size: 600% 600%;
    animation: moveGradient 5s ease infinite;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

@keyframes moveGradient {
    0% {
        background-position: 0% 50%;
    }

    50% {
        background-position: 100% 50%;
    }

    100% {
        background-position: 0% 50%;
    }
}

/* Buttons */
.gradient-btn {
    background-color: white;
    color: #333;
    border: 1px solid white;
    border-radius: 30px;
    padding: 0.6rem 1.6rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.4s ease;
    box-shadow: 0 0 0 rgba(0, 0, 0, 0);
}

    .gradient-btn:hover {
        background: linear-gradient(90deg, #DD2931, #F5365C);
        color: white;
        transform: scale(1.05);
    }

/* Hero video background */
.hero-video-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    object-fit: cover;
    z-index: 0;
}
/* === BRANDING === */
.brand-icon {
    font-size: 2rem;
    font-weight: bold;
    color: #d9232e;
}
.brand-link {
    text-decoration: none !important;
}

.navbar a {
    text-decoration: none !important;
}


.brand-nihongo {
    font-weight: 700;
    color: #d9232e;
    font-size: 1.5rem;
}

.brand-sekai {
    font-weight: 700;
    color: #111;
    font-size: 1.5rem;
}

/* === HEADER LAYOUT === */
.header {
    background-color: #ffffff;
    padding: 1.2rem 0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-list {
    display: flex;
    gap: 2rem;
    list-style: none;
    margin: 0;
    padding: 0;
    align-items: center;
    font-size: 1.1rem;
}

.nav-link:hover,
.nav-link.active-tab {
    color: #d9232e;
}

.nav-link.active-tab::after {
    content: "";
    position: absolute;
    bottom: -6px;
    left: 0;
    height: 2px;
    width: 100%;
    background-color: #d9232e;
}

/* === SEARCH === */
.nav-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.nav-actions input[type="text"] {
    max-width: 130px;
    border: 1px solid #d9232e;
    color: #d9232e;
    border-radius: 6px;
    padding: 4px 8px;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.nav-actions input[type="text"]:focus {
    outline: none;
    box-shadow: 0 0 5px rgba(217, 35, 46, 0.5);
    border-color: #d9232e;
}

.nav-actions button {
    color: #d9232e;
    font-size: 1.25rem;
    padding: 0 0.25rem;
}

/* === DROPDOWN OVERRIDE === */
.dropdown-menu .dropdown-item.text-danger:hover {
    background-color: #f8d7da;
    color: #a71d2a;
}

/* ACTION BUTTONS */
.nav-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.btn {
    padding: 0.5rem 1.25rem;
    font-weight: 500;
    border-radius: 6px;
    font-size: 0.95rem;
    border: 2px solid transparent;
    transition: all 0.3s ease;
    cursor: pointer;
    text-decoration: none;
}

.btn-primary {
    background-color: #d9232e;
    color: #fff;
    border-color: #d9232e;
}

    .btn-primary:hover {
        background-color: #b81e26;
        border-color: #b81e26;
    }

.btn-outline-primary {
    background-color: #0d6efd;
    color: #fff;
}

    .btn-outline-primary:hover {
        background-color: #0b5ed7; /* màu hover */
        color: #fff;
    }


/* ====== FOOTER STYLES ====== */
.footer {
    background-color: #0f0f1d;
    color: #ffffff;
    padding: 4rem 0 2rem;
    margin-top: 4rem;
}

    .footer .container {
        max-width: 1280px;
        margin: auto;
        padding: 0 1.5rem;
    }

.footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 2rem;
}

.footer-section {
    flex: 1 1 200px;
}

.footer-brand {
    display: flex;
    align-items: center;
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.footer-description {
    font-size: 0.95rem;
    line-height: 1.6;
    color: #ccc;
}

.footer-title {
    color:white !important;
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

    .footer-links li {
        margin-bottom: 0.5rem;
    }

    .footer-links a {
        text-decoration: none;
        color: #aaa;
        font-size: 0.95rem;
        transition: color 0.3s ease;
    }

        .footer-links a:hover {
            color: #fff;
        }

.footer-bottom {
    margin-top: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    font-size: 0.85rem;
    color: #888;
    gap: 0.5rem;
}

.footer-bottom-links a {
    margin: 0 0.5rem;
    text-decoration: none;
    color: #aaa;
}

    .footer-bottom-links a:hover {
        color: #fff;
    }

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
    font-size: 1.25rem;
}

.hero {
    background: linear-gradient(to right, #de2e33, #ef4c8a);
    color: #fff;
    padding: 6rem 2rem;
    position: relative;
}

.hero-content {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    max-width: 1280px;
    margin: auto;
}

.hero-text {
    max-width: 600px;
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
    color: #111;
}

.highlight-yellow {
    color: #f5b800;
}

.hero-subtitle {
    font-size: 1.125rem;
    line-height: 1.6;
    margin-bottom: 2rem;
    color: #f3f3f3;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.hero-stats {
    display: flex;
    flex-wrap: nowrap; /* ❌ Không cho xuống dòng */
    justify-content: center;
    gap: 2.5rem;
    font-size: 1.125rem;
    font-weight: 500;
    color: #fff;
    margin-top: 2rem;
    white-space: nowrap; /* ❌ Không cho label xuống dòng */
    margin-left: 2rem; /* Thêm khoảng cách từ bên trái */
}

.stat-item {
    display: inline-flex;
    align-items: baseline;
    gap: 0.35rem;
    font-size: 1.1rem;
}

    .stat-item strong {
        font-weight: 700;
        color: #ffffff;
    }

.stat-label {
    font-weight: 400;
    color: #ffffffb3;
}


.stat-item:hover .stat-number,
.stat-item:hover .stat-label {
    color: #ffffff;
    transform: scale(1.05);
    transition: all 0.2s ease;
}


.hero-image-wrapper {
    position: relative;
    z-index: 2;
    display: inline-block;
    animation: floatUpDown 3s ease-in-out infinite;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.25); 
    border-radius: 16px;
    overflow: hidden;
}
    .hero-image-wrapper::after {
        content: '';
        position: absolute;
        bottom: -10px;
        left: 50%;
        transform: translateX(-50%);
        width: 60%;
        height: 15px;
        background: radial-gradient(rgba(0,0,0,0.3), transparent);
        border-radius: 50%;
        z-index: -1;
        filter: blur(5px);
    }

.hero-img {
    display: block;
    max-width: 100%;
    height: auto;
    border-radius: 16px;
    z-index: 2;
    position: relative;
}

@keyframes floatUpDown {
    0%, 100% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-10px);
    }
}

.hero-image-wrapper {
    animation: floatUpDown 3s ease-in-out infinite;
}

.kanji-overlay {
    position: absolute;
    right: 4rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 12rem;
    color: rgba(255, 255, 255, 0.08);
    pointer-events: none;
    user-select: none;
    font-weight: bold;
}

/* RED BACKGROUND, WHITE BORDER + TEXT */
.btn-red-white {
    background-color: #d9232e;
    color: #ffffff;
    border: 2px solid #ffffff;
    font-weight: 600;
    padding: 0.6rem 1.5rem;
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    text-decoration: none;
    transition: all 0.3s ease;
}

    .btn-red-white:hover {
        background-color: #b81e26;
        color: #fff;
    }

/* Tuỳ chỉnh lại .btn-outline theo đúng giao diện */
.btn-outline {
    background-color: transparent;
    color: #fff; /* 👈 chữ trắng tĩnh */
    border: 2px solid #d9232e;
    font-weight: 600;
    padding: 0.6rem 1.5rem;
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    text-decoration: none;
    transition: all 0.3s ease;
}

    .btn-outline:hover {
        background-color: #d9232e;
        color: #fff;
    }

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.dropdown-menu .dropdown-item.text-danger:hover {
    background-color: #f8d7da;
    color: #a71d2a;
}

.feature-card {
    border-radius: 1rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

    .feature-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
    }

.transition-hover {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

    .transition-hover:hover {
        transform: translateY(-6px);
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    }

.btn {
    transition: all 0.3s ease;
}

    .btn:hover {
        transform: translateY(-3px);
        box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
    }

footer.footer {
    margin-top: 0 !important;
}

.nav-link.active-tab {
    color: #dc3545 !important;
    font-weight: bold;
    position: relative;
}

    .nav-link.active-tab::after {
        content: "";
        position: absolute;
        bottom: 0;
        left: 0;
        height: 2px;
        width: 100%;
        background-color: #dc3545;
    }

/* loading */
.loader-container {
    text-align: center;
    color: white;
}

.spinner {
    width: 80px;
    height: 80px;
    border: 8px solid rgba(255, 255, 255, 0.2);
    border-top-color: #ffffff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: auto;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}


.card .card-body p {
    font-size: 15px;
}

.badge {
    font-size: 13px;
    padding: 5px 10px;
    border-radius: 6px;
}


/*Change password*/
.change-password-wrapper {
    background: linear-gradient(135deg, #f43f5e, #f9a8d4, #fdf2f8);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
}

.change-password-card {
    background-color: white;
    border-radius: 1rem;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
    padding: 2rem;
    width: 100%;
    max-width: 480px;
}

.change-password-bg {
    background: linear-gradient(135deg, #ffe0ec, #ffeaf3); /* Hồng phấn nhạt */
    min-height: 100vh;
    padding-top: 80px;
    padding-bottom: 80px;
}
/* ===== Change Password Styling ===== */
.change-password-bg {
    background: linear-gradient(135deg, #fce4ec, #f8bbd0); /* Nền hồng nhạt */
    min-height: 100vh;
    padding-top: 100px;
    padding-bottom: 100px;
}

.change-password-card {
    background-color: rgba(255, 255, 255, 0.92); /* Form trắng dịu */
    border-radius: 16px;
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.1);
    padding: 2.5rem;
    width: 100%;
    max-width: 460px;
    backdrop-filter: blur(2px);
}

/* Button styles */
.btn-danger {
    background-color: #e63946;
    border-color: #e63946;
}

    .btn-danger:hover {
        background-color: #d62839;
        border-color: #d62839;
    }

.btn-outline-danger {
    color: #e63946;
    border-color: #e63946;
}

    .btn-outline-danger:hover {
        background-color: #e63946;
        color: #fff;
    }

/* change pass Sakura petals animation */
.sakura-petal {
    position: fixed;
    top: -40px;
    width: 20px;
    height: 20px;
    background-image: url('/images/sakura.png');
    background-size: cover;
    background-repeat: no-repeat;
    opacity: 0.8;
    pointer-events: none;
    z-index: 1000;
    animation-name: fall;
    animation-timing-function: linear;
    animation-iteration-count: infinite;
}

@keyframes fall {
    0% {
        transform: translateY(0) rotate(0deg);
        opacity: 1;
    }

    100% {
        transform: translateY(100vh) rotate(360deg);
        opacity: 0;
    }
}
/* My Profile*/
.my-profile-container {
    padding: 60px 40px;
    background-color: #ffffff; /* Nền trắng */
    min-height: 100vh;
}


.avatar-box {
    background-color: #ffffff;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.profile-image {
    width: 150px;
    height: 150px;
    object-fit: cover;
}

.info-wrapper {
    background-color: white;
    border: none;
    border-radius: 20px; 
    padding: 20px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.action-buttons {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.action-link {
    display: inline-block;
    width: 220px;
    padding: 12px 12px;
    background-color: #e5424d;
    border: none;
    border-radius: 8px;
    text-decoration: none;
    color: #ffffff;
    font-weight: 500;
    font-size: 16px;
    transition: background-color 0.3s, transform 0.2s;
    text-align: center;
    margin: 0 auto;
}


    .action-link:hover {
        background-color: #c83741; /* Hover đỏ đậm hơn */
        transform: translateY(-2px);
    }

    .action-link,
    .action-link:visited,
    .action-link:hover,
    .action-link:focus {
        color: #ffffff !important;
        text-decoration: none;
    }


.user-info {
    font-family: 'Poppins', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: #333;
}

    .user-info strong {
        font-weight: 600;
        color: #be123c; /* đỏ pastel đậm nhẹ */
    }

/* Loading spinner styles */
.loader-container {
    text-align: center;
    color: white;
}

.spinner {
    width: 80px;
    height: 80px;
    border: 8px solid #DD2931;
    border-top-color: #ffffff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: auto;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.loading-text {
    margin-top: 20px;
    font-size: 24px;
    font-weight: bold;
    animation: colorShift 3s ease-in-out infinite;
    color: #DD2931;
    text-align: center;
}

@keyframes colorShift {
    0% {
        color: #DD2931;
    }

    50% {
        color: #F5365C;
    }

    100% {
        color: #aaa;
    }
}

/*My purchase course*/
.course-card {
    background-color: #fff;
    border-radius: 1rem;
    transition: transform 0.2s ease-in-out;
    box-shadow: 0 4px 10px rgba(255, 0, 0, 0.05);
}

    .course-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 6px 18px rgba(255, 0, 0, 0.15);
    }

.course-thumbnail {
    height: 220px;
    object-fit: cover;
    border-top-left-radius: 1rem;
    border-top-right-radius: 1rem;

.card .card-body p {
    font-size: 15px;
}

.badge {
    font-size: 13px;
    padding: 5px 10px;
    border-radius: 6px;

}

/*.bg-gradient-danger {
    background: linear-gradient(87deg, #f5365c 0, #f56036 100%) !important;
}*/

#sidenav-main .nav-link.active {
    background-color: rgba(255,255,255,0.15);
    border-radius: 0.5rem;
    font-weight: 600;
}

    .navbar-nav .nav-link:hover,
    .navbar-nav .nav-link.active {
        background-color: rgba(255, 255, 255, 0.2);
        font-weight: 600;
    }

.daily-word-modal {
    display: none;
    position: fixed;
    z-index: 2000;
    padding-top: 100px;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.6);
}

    .daily-word-modal .modal-content {
        margin: auto;
        background: white;
        border-radius: 20px;
        padding: 30px;
        width: 80%;
        max-width: 500px;
        text-align: center;
        animation: fadeIn 0.3s ease-in-out;
    }

    .daily-word-modal .close {
        color: #aaa;
        float: right;
        font-size: 30px;
        font-weight: bold;
        cursor: pointer;
    }

/* Center file input + upload button */
.custom-upload-input {
    width: 240px;
    text-align: center;
}

/* Chỉnh lại kích thước nút */
.custom-upload-btn {
    width: 240px;
}

/* Center Quick Action buttons */
.centered-actions {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.edit-profile-wrapper {
    padding: 60px 20px;
    max-width: 1000px;
    margin: auto;
}

.form-box {
    background-color: #fff;
    border-radius: 16px;
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.12);
    padding: 40px;
}

.form-title {
    font-weight: 700;
    font-size: 1.4rem;
    margin-bottom: 30px;
    color: #d9232e;
}

.avatar-section img {
    width: 160px;
    height: 160px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid #eee;
}

.custom-upload-btn {
    margin-top: 12px;
}

.social-group input {
    width: 100%;
}

form .form-label {
    font-weight: 500;
}

form .form-control {
    border-radius: 6px;
}

.shadow-box {
    background-color: #fff;
    border: 1px solid rgba(0, 0, 0, 0.05);
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
    padding: 2rem;
    margin-top: 2rem;
}

.btn-back-profile {
    background-color: #6c757d; /* xám đậm hơn */
    color: white;
    border: none;
    border-radius: 6px;
    padding: 8px 16px;
    font-weight: 500;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transition: background-color 0.2s ease;
}

    .btn-back-profile:hover {
        background-color: #343a40;
        color: white;
    }

.profile-box {
    max-width: 600px;
    background: #fff;
    border-radius: 12px;
}

.info-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.card {
    border: none;
    border-radius: 10px;
}

/* Nút chính màu đỏ */
.btn-danger {
    background-color: #b30000;
    border-color: #b30000;
}

    .btn-danger:hover {
        background-color: #a00000;
    }

/* Nút viền đỏ */
.btn-outline-danger {
    color: #b30000;
    border-color: #b30000;
}

    .btn-outline-danger:hover {
        background-color: #b30000;
        color: #fff;
    }

/* Social Buttons */
.social-btn {
    font-weight: 600;
    text-align: center;
}

.profile-container {
    margin-bottom: 120px !important; /* Đảm bảo khoảng cách dưới */
}

    .profile-container .card.text-center {
        text-align: center;
    }

    .profile-container .badge {
        display: inline-block;
        margin: 0 auto;
        font-size: 0.95rem;
    }

    .profile-container .btn {
        text-align: center;
    }

.btn-change-pass {
    background-color: #f7f7f7;
    border: 1px solid #f0f0f0;
    color: #b30000;
}

    .btn-change-pass:hover {
        background-color: #e6e6e6;
        color: #b30000;
    }

.btn-back-simple {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background-color: #dc3545; /* Màu đỏ */
    color: white;
    padding: 8px 16px;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 500;
    transition: background-color 0.3s ease;
}

    .btn-back-simple:hover {
        background-color: #bb2d3b; /* Màu đỏ đậm khi hover */
        color: white;

.result-container {
    max-width: 900px;
}

.text-gradient {
    background: linear-gradient(to right, #f5365c, #ff7e5f);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.result-card {
    background: #fffdfc;
}

.score-section .score-circle {
    background: linear-gradient(to bottom right, #f5365c, #ff7e5f);
    color: #fff;
    border-radius: 50%;
    width: 120px;
    height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: bold;
    margin: 0 auto;
}

.option-item {
    transition: transform 0.2s ease;
}

    .option-item:hover {
        transform: scale(1.02);
    }

.btn-gradient {
    background: linear-gradient(to right, #f5365c, #ff7e5f);
    color: white;
    border: none;
    border-radius: 25px;
    transition: 0.3s ease;
}

    .btn-gradient:hover {
        opacity: 0.9;
        transform: translateY(-2px);

.btn-change-pass {
    background-color: #f7f7f7;
    border: 1px solid #f0f0f0;
    color: #b30000;
}

    .btn-change-pass:hover {
        background-color: #e6e6e6;
        color: #b30000;
    }

.btn-back-simple {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background-color: #dc3545; /* Màu đỏ */
    color: white;
    padding: 8px 16px;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 500;
    transition: background-color 0.3s ease;
}

    .btn-back-simple:hover {
        background-color: #bb2d3b; /* Màu đỏ đậm khi hover */
        color: white;
    }
#word-popup-button {
    position: fixed !important;
    bottom: 1rem !important;
    right: 1rem !important;
    margin: 0 !important;
    transform: none !important;
    z-index: 9999 !important;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--color-primary-600);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

    #word-popup-button:hover {
        transform: scale(1.1) !important;
        box-shadow: 0 6px 16px rgba(0,0,0,0.3) !important;
    }