/* 💙 HeartTime - Material Design 3 Top App Bar Component */

/* ===== Top App Bar Container ===== */

.m3-top-app-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--m3-top-app-bar-height);
    background-color: var(--m3-surface);
    border-bottom: 1px solid var(--m3-outline-variant);
    z-index: 1000;
    box-shadow: var(--m3-elevation-level1);
    
    /* Safe area support for devices with notch */
    padding-top: env(safe-area-inset-top, 0px);
    height: calc(var(--m3-top-app-bar-height) + env(safe-area-inset-top, 0px));
}

/* Add visual spacer below top app bar */
.m3-top-app-bar::after {
    content: '';
    position: fixed;
    top: calc(var(--m3-top-app-bar-height) + env(safe-area-inset-top, 0px));
    left: 0;
    right: 0;
    height: var(--m3-space-4);
    background-color: var(--m3-background);
    z-index: 999; /* Just below the top app bar */
    pointer-events: none;
}

.m3-top-app-bar-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--m3-top-app-bar-height);
    padding: 0 var(--m3-space-2);
    position: relative;
}

/* ===== Leading Section (App Icon / Back Button) ===== */

.m3-top-app-bar-leading {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    width: 48px;
    height: 48px;
}

.m3-top-app-bar-back-button,
.m3-top-app-bar-app-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border: none;
    background: none;
    border-radius: var(--m3-shape-corner-full);
    color: var(--m3-on-surface);
    cursor: pointer;
    transition: background-color var(--m3-motion-duration-short2) var(--m3-motion-easing-standard);
    position: relative;
    overflow: hidden;
}

.m3-top-app-bar-back-button:hover,
.m3-top-app-bar-app-icon:hover {
    background-color: rgba(31, 41, 55, 0.08); /* On-surface with 8% opacity */
}

.m3-top-app-bar-back-button:active,
.m3-top-app-bar-app-icon:active {
    background-color: rgba(31, 41, 55, 0.12); /* On-surface with 12% opacity */
    transform: scale(0.95);
}

.m3-top-app-bar-back-button:focus,
.m3-top-app-bar-app-icon:focus {
    outline: 2px solid var(--m3-primary);
    outline-offset: 2px;
}

.m3-top-app-bar-back-button i,
.m3-top-app-bar-app-icon i {
    font-size: 20px;
}

.m3-top-app-bar-app-icon i {
    color: var(--m3-primary);
}

/* Hide app icon when back button is visible */
.m3-top-app-bar-content:has(.m3-top-app-bar-back-button:not([style*="display: none"])) .m3-top-app-bar-app-icon {
    display: none;
}

/* ===== Title Section ===== */

.m3-top-app-bar-title {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 var(--m3-space-2);
    overflow: hidden;
}

.m3-top-app-bar-title-text {
    font-size: var(--m3-title-large-font);
    font-weight: var(--m3-title-large-weight);
    line-height: var(--m3-title-large-line-height);
    letter-spacing: var(--m3-title-large-tracking);
    color: var(--m3-on-surface);
    margin: 0;
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-weight: 600;
}

/* Responsive title adjustments */
@media (max-width: 359px) {
    .m3-top-app-bar-title-text {
        font-size: var(--m3-title-medium-font);
        font-weight: var(--m3-title-medium-weight);
    }
}

/* Title animation for page transitions */
.m3-top-app-bar-title-text {
    transition: opacity var(--m3-motion-duration-short2) var(--m3-motion-easing-standard);
}

.m3-top-app-bar.loading .m3-top-app-bar-title-text {
    opacity: 0.6;
}

/* ===== Actions Container ===== */

.m3-top-app-bar-actions {
    position: absolute;
    top: 50%;
    right: var(--m3-space-2);
    transform: translateY(-50%);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
}

/* ===== Profile Avatar Button ===== */

.m3-top-app-bar-avatar {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border: none;
    background: none;
    border-radius: var(--m3-shape-corner-full);
    cursor: pointer;
    transition: transform var(--m3-motion-duration-short2) var(--m3-motion-easing-standard);
    position: relative;
    overflow: hidden;
}

.m3-top-app-bar-avatar:hover {
    transform: scale(1.05);
}

.m3-top-app-bar-avatar:active {
    transform: scale(0.95);
}

.m3-top-app-bar-avatar:focus {
    outline: 2px solid var(--m3-primary);
    outline-offset: 2px;
}

.m3-avatar-image {
    width: 32px;
    height: 32px;
    border-radius: var(--m3-shape-corner-full);
    object-fit: cover;
    border: 2px solid var(--m3-outline-variant);
    transition: border-color var(--m3-motion-duration-short2) var(--m3-motion-easing-standard);
}

.m3-top-app-bar-avatar:hover .m3-avatar-image {
    border-color: var(--m3-primary);
}

/* ===== Menu Button (for non-authenticated users) ===== */

.m3-top-app-bar-menu-button {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border: none;
    background: none;
    border-radius: var(--m3-shape-corner-full);
    color: var(--m3-on-surface);
    cursor: pointer;
    transition: background-color var(--m3-motion-duration-short2) var(--m3-motion-easing-standard);
    position: relative;
    overflow: hidden;
}

.m3-top-app-bar-menu-button:hover {
    background-color: rgba(31, 41, 55, 0.08);
}

.m3-top-app-bar-menu-button:active {
    background-color: rgba(31, 41, 55, 0.12);
    transform: scale(0.95);
}

.m3-top-app-bar-menu-button:focus {
    outline: 2px solid var(--m3-primary);
    outline-offset: 2px;
}

.m3-top-app-bar-menu-button i {
    font-size: 20px;
}

/* ===== Progress Indicator ===== */

.m3-top-app-bar-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    opacity: 0;
    transition: opacity var(--m3-motion-duration-short2) var(--m3-motion-easing-standard);
}

.m3-top-app-bar-progress.visible {
    opacity: 1;
}

.m3-progress-bar {
    width: 100%;
    height: 100%;
    background-color: rgba(14, 165, 233, 0.2);
    overflow: hidden;
}

.m3-progress-bar-fill {
    height: 100%;
    background-color: var(--m3-primary);
    width: 0%;
    animation: m3-progress-indeterminate 2s infinite linear;
}

@keyframes m3-progress-indeterminate {
    0% {
        width: 0%;
        margin-left: 0%;
    }
    50% {
        width: 100%;
        margin-left: 0%;
    }
    100% {
        width: 0%;
        margin-left: 100%;
    }
}

/* ===== Ripple Effects ===== */

.m3-top-app-bar-back-button::before,
.m3-top-app-bar-app-icon::before,
.m3-top-app-bar-avatar::before,
.m3-top-app-bar-menu-button::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background-color: currentColor;
    opacity: 0.2;
    transform: translate(-50%, -50%);
    transition: width var(--m3-motion-duration-medium1) var(--m3-motion-easing-standard),
                height var(--m3-motion-duration-medium1) var(--m3-motion-easing-standard);
}

.m3-top-app-bar-back-button:active::before,
.m3-top-app-bar-app-icon:active::before,
.m3-top-app-bar-avatar:active::before,
.m3-top-app-bar-menu-button:active::before {
    width: 48px;
    height: 48px;
}

/* ===== Touch-specific Interactions ===== */

@media (hover: none) and (pointer: coarse) {
    .m3-top-app-bar-back-button:hover,
    .m3-top-app-bar-app-icon:hover,
    .m3-top-app-bar-menu-button:hover {
        background-color: transparent;
    }
    
    .m3-top-app-bar-avatar:hover {
        transform: none;
    }
    
    .m3-top-app-bar-avatar:hover .m3-avatar-image {
        border-color: var(--m3-outline-variant);
    }
    
    .m3-top-app-bar-back-button:active,
    .m3-top-app-bar-app-icon:active,
    .m3-top-app-bar-menu-button:active {
        background-color: rgba(31, 41, 55, 0.12);
    }
    
    .m3-top-app-bar-avatar:active {
        transform: scale(0.95);
    }
}

/* ===== Accessibility Enhancements ===== */

/* High contrast mode support */
@media (prefers-contrast: high) {
    .m3-top-app-bar {
        border-bottom: 2px solid var(--m3-outline);
    }
    
    .m3-avatar-image {
        border-width: 3px;
    }
}

/* ===== Reduced Motion Support ===== */

@media (prefers-reduced-motion: reduce) {
    .m3-top-app-bar-back-button,
    .m3-top-app-bar-app-icon,
    .m3-top-app-bar-avatar,
    .m3-top-app-bar-menu-button,
    .m3-avatar-image,
    .m3-top-app-bar-progress,
    .m3-progress-bar-fill {
        transition: none;
        animation: none;
    }
    
    .m3-top-app-bar-back-button::before,
    .m3-top-app-bar-app-icon::before,
    .m3-top-app-bar-avatar::before,
    .m3-top-app-bar-menu-button::before {
        transition: none;
    }
}

/* ===== Responsive Adjustments ===== */

@media (max-width: 359px) {
    .m3-top-app-bar-content {
        padding: 0 var(--m3-space-1);
    }
    
    .m3-top-app-bar-actions {
        right: var(--m3-space-1);
    }
}

@media (min-width: 600px) {
    .m3-top-app-bar {
        display: none; /* Hide on tablet and desktop */
    }
}

/* ===== Loading State ===== */

.m3-top-app-bar.loading .m3-top-app-bar-progress {
    opacity: 1;
}

/* ===== Dark Mode Support (Future Enhancement) ===== */

@media (prefers-color-scheme: dark) {
    .m3-top-app-bar {
        background-color: var(--m3-surface);
        border-bottom-color: var(--m3-outline-variant);
    }
    
    .m3-progress-bar {
        background-color: rgba(14, 165, 233, 0.3);
    }
}