.container {
    width: min(calc(100% - 40px), var(--container-width));
    margin: 0 auto;
}

.section {
    padding: var(--space-11) 0;
}

/* =========================================================
   Button
========================================================= */

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 0 22px;
    color: inherit;
    border: 1px solid transparent;
    border-radius: var(--radius-pill);
    font-weight: 700;
    letter-spacing: 0.01em;
    cursor: pointer;
    transition:
        transform var(--transition-fast),
        box-shadow var(--transition-fast),
        border-color var(--transition-fast),
        background var(--transition-fast),
        opacity var(--transition-fast);
}

.button:hover {
    transform: translateY(-2px);
}

.button:active {
    transform: translateY(0);
}

.button:disabled {
    cursor: not-allowed;
    opacity: 0.65;
    transform: none;
}

.button--primary {
    color: var(--color-text-dark);
    background: var(--gradient-primary);
    box-shadow: var(--shadow-primary);
}

.button--primary:hover {
    background: var(--gradient-primary-hover);
    box-shadow: var(--shadow-primary-strong);
}

.button--outline {
    color: var(--color-primary-light);
    border-color: var(--color-border-strong);
    background: rgba(245, 196, 81, 0.04);
}

.button--outline:hover {
    border-color: var(--color-primary);
    background: rgba(245, 196, 81, 0.10);
}

.button--glass {
    color: var(--color-text);
    border-color: var(--color-border-light);
    background: rgba(255, 255, 255, 0.06);
    backdrop-filter: blur(10px);
}

.button--glass:hover {
    border-color: var(--color-border-strong);
    background: rgba(255, 255, 255, 0.10);
}

.button--large {
    min-height: 52px;
    padding: 0 30px;
    font-size: var(--font-size-lg);
}

.button--full {
    width: 100%;
}

/* =========================================================
   Brand
========================================================= */

.brand {
    display: inline-flex;
    align-items: center;
    gap: var(--space-3);
    flex-shrink: 0;
}

.brand__mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 46px;
    height: 46px;
    color: var(--color-text-dark);
    background: var(--gradient-primary);
    border-radius: 14px;
    box-shadow: var(--shadow-primary);
    font-size: 26px;
    font-weight: 900;
}

.brand__text {
    display: flex;
    flex-direction: column;
    line-height: 1;
}

.brand__text strong {
    color: var(--color-primary-light);
    font-size: 24px;
    letter-spacing: 0.08em;
}

.brand__text small {
    margin-top: 5px;
    color: var(--color-text-muted);
    font-size: 10px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
}

/* =========================================================
   Trạng thái backend
========================================================= */

.server-status {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-left: auto;
    padding: 7px 12px;
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-pill);
    color: var(--color-text-soft);
    background: rgba(255, 255, 255, 0.04);
    font-size: var(--font-size-xs);
    white-space: nowrap;
}

.server-status__dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-warning);
    box-shadow: 0 0 12px currentColor;
}

.server-status--online .server-status__dot {
    background: var(--color-success);
}

.server-status--offline .server-status__dot {
    background: var(--color-danger);
}

/* =========================================================
   Tiêu đề section
========================================================= */

.section-heading {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: var(--space-7);
    margin-bottom: var(--space-8);
}

.section-heading--center {
    justify-content: center;
    text-align: center;
}

.section-heading__eyebrow {
    display: inline-block;
    margin-bottom: var(--space-3);
    color: var(--color-primary);
    font-size: var(--font-size-sm);
    font-weight: 800;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

.section-heading__title {
    margin-bottom: var(--space-3);
    color: var(--color-text);
    font-size: clamp(32px, 4vw, 48px);
}

.section-heading__description {
    max-width: 650px;
    color: var(--color-text-soft);
}

.text-link {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--color-primary-light);
    font-weight: 700;
    white-space: nowrap;
}

.text-link span {
    transition: transform var(--transition-fast);
}

.text-link:hover span {
    transform: translateX(5px);
}

/* =========================================================
   Form
========================================================= */

.form-field {
    display: grid;
    gap: 9px;
}

.form-field > span {
    color: var(--color-text-soft);
    font-size: var(--font-size-sm);
    font-weight: 700;
}

.form-field input {
    width: 100%;
    height: 48px;
    padding: 0 15px;
    color: var(--color-text);
    outline: none;
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-medium);
    background: rgba(255, 255, 255, 0.05);
    transition:
        border-color var(--transition-fast),
        box-shadow var(--transition-fast),
        background var(--transition-fast);
}

.form-field input:hover {
    border-color: var(--color-border);
}

.form-field input:focus {
    border-color: var(--color-primary);
    background: rgba(245, 196, 81, 0.05);
    box-shadow: 0 0 0 4px rgba(245, 196, 81, 0.10);
}

.form-field input:disabled {
    cursor: not-allowed;
    opacity: 0.65;
}

/* =========================================================
   Modal
========================================================= */

.modal {
    position: fixed;
    inset: 0;
    z-index: var(--z-modal);
    display: grid;
    place-items: center;
    padding: 20px;
    visibility: hidden;
    opacity: 0;
    transition:
        opacity var(--transition-normal),
        visibility var(--transition-normal);
}

.modal.is-open {
    visibility: visible;
    opacity: 1;
}

.modal__overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.78);
    backdrop-filter: blur(8px);
}

.modal__dialog {
    position: relative;
    z-index: 1;
    width: min(100%, 440px);
    padding: 38px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-large);
    background:
        radial-gradient(
            circle at 50% 0%,
            rgba(245, 196, 81, 0.16),
            transparent 35%
        ),
        var(--gradient-card);
    box-shadow: var(--shadow-large);
    transform: translateY(20px) scale(0.98);
    transition: transform var(--transition-normal);
}

.modal.is-open .modal__dialog {
    transform: translateY(0) scale(1);
}

.modal__close {
    position: absolute;
    top: 14px;
    right: 16px;
    display: grid;
    place-items: center;
    width: 34px;
    height: 34px;
    color: var(--color-text-muted);
    border-radius: 50%;
    font-size: 28px;
    transition:
        color var(--transition-fast),
        background var(--transition-fast);
}

.modal__close:hover {
    color: var(--color-text);
    background: rgba(255, 255, 255, 0.08);
}

.modal__header {
    margin-bottom: var(--space-7);
    text-align: center;
}

.modal__icon {
    display: grid;
    place-items: center;
    width: 62px;
    height: 62px;
    margin: 0 auto var(--space-4);
    color: var(--color-text-dark);
    background: var(--gradient-primary);
    border-radius: 20px;
    box-shadow: var(--shadow-primary);
    font-size: 32px;
    font-weight: 900;
}

.modal__header h2 {
    margin-bottom: 10px;
    font-size: 30px;
}

.modal__header p {
    color: var(--color-text-soft);
}

.auth-form {
    display: grid;
    gap: var(--space-5);
}

/* =========================================================
   Toast
========================================================= */

.toast-container {
    position: fixed;
    right: 22px;
    bottom: 22px;
    z-index: var(--z-toast);
    display: grid;
    gap: 12px;
    width: min(380px, calc(100% - 44px));
}

.toast {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 16px 18px;
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-medium);
    background: rgba(22, 21, 16, 0.96);
    box-shadow: var(--shadow-medium);
    backdrop-filter: blur(14px);
    animation: toast-enter 260ms ease both;
    transition:
        opacity var(--transition-normal),
        transform var(--transition-normal);
}

.toast--success {
    border-color: rgba(55, 214, 122, 0.35);
}

.toast--error {
    border-color: rgba(255, 95, 104, 0.42);
}

.toast--info {
    border-color: rgba(84, 169, 255, 0.35);
}

.toast__icon {
    flex: 0 0 auto;
    display: grid;
    place-items: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: rgba(245, 196, 81, 0.12);
}

.toast--success .toast__icon {
    color: var(--color-success);
    background: rgba(55, 214, 122, 0.12);
}

.toast--error .toast__icon {
    color: var(--color-danger);
    background: rgba(255, 95, 104, 0.12);
}

.toast--info .toast__icon {
    color: var(--color-info);
    background: rgba(84, 169, 255, 0.12);
}

.toast__content {
    min-width: 0;
}

.toast__content strong {
    display: block;
    margin-bottom: 3px;
    color: var(--color-text);
}

.toast__content p {
    color: var(--color-text-soft);
    font-size: var(--font-size-sm);
    overflow-wrap: anywhere;
}

/* =========================================================
   Khu vực tài khoản trên header
========================================================= */

.guest-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.guest-actions[hidden],
.user-account[hidden],
.user-account__menu[hidden] {
    display: none !important;
}

.user-account {
    position: relative;
    flex-shrink: 0;
}

.user-account__button {
    display: flex;
    align-items: center;
    gap: 11px;
    min-height: 52px;
    padding: 6px 14px 6px 7px;
    color: var(--color-text);
    border: 1px solid var(--color-border-strong);
    border-radius: var(--radius-pill);
    background:
        linear-gradient(
            135deg,
            rgba(245, 196, 81, 0.12),
            rgba(255, 255, 255, 0.035)
        );
    box-shadow: var(--shadow-small);
    transition:
        border-color var(--transition-fast),
        background var(--transition-fast),
        box-shadow var(--transition-fast),
        transform var(--transition-fast);
}

.user-account__button:hover {
    transform: translateY(-2px);
    border-color: var(--color-primary);
    background:
        linear-gradient(
            135deg,
            rgba(245, 196, 81, 0.20),
            rgba(255, 255, 255, 0.06)
        );
    box-shadow: var(--shadow-primary);
}

.user-account__button:focus-visible {
    outline: none;
    border-color: var(--color-primary);
    box-shadow:
        var(--shadow-primary),
        0 0 0 4px rgba(245, 196, 81, 0.12);
}

.user-account__avatar {
    display: grid;
    place-items: center;
    width: 38px;
    height: 38px;
    flex: 0 0 38px;
    color: var(--color-text-dark);
    background: var(--gradient-primary);
    border-radius: 50%;
    box-shadow: var(--shadow-primary);
    font-size: 18px;
    font-weight: 900;
    text-transform: uppercase;
}

.user-account__summary {
    display: flex;
    min-width: 0;
    flex-direction: column;
    align-items: flex-start;
    line-height: 1.2;
}

.user-account__summary strong {
    max-width: 130px;
    overflow: hidden;
    color: var(--color-text);
    font-size: var(--font-size-sm);
    text-overflow: ellipsis;
    white-space: nowrap;
}

.user-account__summary small {
    margin-top: 3px;
    color: var(--color-primary-light);
    font-size: var(--font-size-xs);
    font-weight: 700;
}

.user-account__arrow {
    color: var(--color-primary-light);
    font-size: 13px;
    transition: transform var(--transition-fast);
}

.user-account__button[aria-expanded="true"]
.user-account__arrow {
    transform: rotate(180deg);
}

.user-account__menu {
    position: absolute;
    top: calc(100% + 12px);
    right: 0;
    z-index: calc(var(--z-header) + 10);
    width: 280px;
    padding: 18px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-large);
    background:
        radial-gradient(
            circle at 50% 0%,
            rgba(245, 196, 81, 0.13),
            transparent 36%
        ),
        rgba(16, 15, 11, 0.98);
    box-shadow: var(--shadow-large);
    backdrop-filter: blur(18px);
    animation: account-menu-enter 180ms ease both;
}

.user-account__menu::before {
    position: absolute;
    top: -7px;
    right: 28px;
    width: 13px;
    height: 13px;
    content: "";
    border-top: 1px solid var(--color-border);
    border-left: 1px solid var(--color-border);
    background: rgba(24, 22, 15, 0.98);
    transform: rotate(45deg);
}

.user-account__info {
    display: flex;
    min-width: 0;
    flex-direction: column;
    gap: 4px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--color-border-light);
}

.user-account__info strong {
    overflow: hidden;
    color: var(--color-text);
    font-size: var(--font-size-md);
    text-overflow: ellipsis;
    white-space: nowrap;
}

.user-account__info span {
    overflow: hidden;
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    text-overflow: ellipsis;
    white-space: nowrap;
}

.user-account__balance {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    margin: 14px 0;
    padding: 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-medium);
    background: rgba(245, 196, 81, 0.07);
}

.user-account__balance span {
    color: var(--color-text-soft);
    font-size: var(--font-size-sm);
}

.user-account__balance strong {
    color: var(--color-primary-light);
    font-size: var(--font-size-lg);
    white-space: nowrap;
}

.user-account__logout {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    min-height: 42px;
    color: var(--color-danger);
    border: 1px solid rgba(255, 95, 104, 0.28);
    border-radius: var(--radius-medium);
    background: rgba(255, 95, 104, 0.06);
    font-weight: 700;
    transition:
        color var(--transition-fast),
        border-color var(--transition-fast),
        background var(--transition-fast),
        transform var(--transition-fast);
}

.user-account__logout:hover {
    color: #ffffff;
    border-color: var(--color-danger);
    background: rgba(255, 95, 104, 0.18);
    transform: translateY(-1px);
}

.user-account__logout:focus-visible {
    outline: none;
    box-shadow: 0 0 0 4px rgba(255, 95, 104, 0.12);
}

/* =========================================================
   Animation
========================================================= */

@keyframes toast-enter {
    from {
        opacity: 0;
        transform: translateX(25px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes account-menu-enter {
    from {
        opacity: 0;
        transform: translateY(-7px) scale(0.98);
    }

    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* =========================================================
   Responsive cho component tài khoản
========================================================= */

@media (max-width: 900px) {
    .guest-actions {
        display: none;
    }

    .user-account__summary {
        display: none;
    }

    .user-account__button {
        min-width: 48px;
        min-height: 48px;
        padding: 5px;
    }

    .user-account__arrow {
        display: none;
    }

    .user-account__menu {
        right: 0;
    }
}

@media (max-width: 680px) {
    .modal__dialog {
        padding: 34px 22px 26px;
    }

    .toast-container {
        right: 14px;
        bottom: 14px;
        width: calc(100% - 28px);
    }

    .user-account__menu {
        width: min(280px, calc(100vw - 28px));
    }
}

@media (max-width: 420px) {
    .user-account__menu {
        position: fixed;
        top: 118px;
        right: 14px;
        left: 14px;
        width: auto;
    }

    .user-account__menu::before {
        display: none;
    }
}